CN103901505B - A method and device for detecting cloud top height based on wet bulb effect - Google Patents

Abstract

The invention provides a cloud top height detection method and device based on the wet bulb effect. The detection method includes: raising the radiosonde to make the radiosonde pass through the cloud layer upward; through the first temperature element and the The second temperature element collects temperature data, the first temperature element is a temperature element that does not absorb moisture on the surface, and the second temperature element is a temperature element that absorbs moisture on the surface; according to the temperature data to confirm the time point when the wet bulb effect occurs, the The height of the radiosonde at the time point when the wet bulb effect occurs is recorded as the cloud top height. The invention can automatically judge the cloud top height by using the data obtained by the wireless radiosonde in the process of passing through the clouds, and provides a new method and a new way for the cloud height judgment research.

Description

A method and device for detecting cloud top height based on wet bulb effect

technical field

The invention relates to the field of meteorological detection, in particular to a method and device for detecting cloud top height based on wet bulb effect.

Background technique

Clouds are visible aggregates of small water droplets or ice crystal particles floating in the atmosphere, and are the condensation (or sublimation) of water vapor in the air. Clouds play an extremely important role in physical processes such as the development of weather systems, precipitation formation, and atmospheric radiative transfer, so the measurement of various parameters of clouds is very important. Cloud height, as an important macroscopic physical characteristic parameter of clouds, has an important impact on air quality, sunshine rate, atmospheric radiation transfer, boundary layer turbulence and flight safety, and is also an important factor in climate diagnostic analysis.

Cloud height information generally includes measurement data of cloud base height and cloud top height. There are many instruments and methods for ground-based measurement of cloud base height, such as cloud curtain balloons, which measure the height of cloud base through the time it takes for the balloon to rise from the ground to the cloud base; another example is cloud curtain lights and rotating beam ceilometers, which measure The distance principle is to use the known data to obtain the height of the cloud base in the direction of the zenith according to the relationship between the sides and angles of a right-angled triangle; another example is the laser radar or laser ceilometer, which uses the laser to observe vertically upwards and receives the backward direction generated at the boundary of the cloud. Scattering signals, by analyzing the changes in the laser echo, determine the position of the cloud base; in addition, the cloud observation equipment developed by the Institute of Atmospheric Physics of the Chinese Academy of Sciences uses an infrared radiometer to scan the entire sky to obtain the brightness temperature of the cloud base, and then inverts to obtain the cloud base high. In addition to the several measurement methods introduced above, there is another more accurate direct observation method, that is, direct observation by aircraft, but the cost is too high to provide long-term continuous cloud boundary information.

For the measurement of cloud tops, at present, satellite remote sensing is mainly used to invert the height of cloud tops according to their brightness temperature values. Due to the optical occlusion of clouds, it is difficult to obtain accurate results for medium and low cloud layers at night or when there are high and medium cloud coverage; Another way to measure cloud tops is through millimeter-wave cloud radar, which has a wide Doppler bandwidth, good directivity, is less affected by ground clutter, can penetrate thicker low clouds, and can detect Most of the middle and high altitude clouds obtain the corresponding cloud top and bottom heights through inversion. The main problem is that precipitation attenuates the electromagnetic waves seriously, so it is mainly used to detect the height and thickness of clouds that do not form precipitation. Due to some deficiencies of the current detecting devices, these devices have not yet been widely used in business.

In addition, as a conventional meteorological observation method, radiosondes are widely used to obtain atmospheric parameters, and the vertical distribution data of temperature, relative humidity and air pressure measured by them are the basic data for studying atmospheric thermodynamics and dynamics processes. In recent years, my country's sounding technology has developed rapidly, and the radiosonde detection system (including temperature, air pressure, humidity sensing elements, and sounding data processing software) has also been updated. The data sampling rate has been increased from minutes to seconds. The corresponding sampling The point height interval is increased from 50 meters to 10 meters, and more details of temperature and humidity changes in the ascent path of the radiosonde can be obtained. Therefore, with the improvement of the automation of upper-air meteorological observation, the meteorological information (especially cloud height information) obtained from conventional sounding data can provide more information for the research of numerical forecast, atmospheric remote sensing, cloud and fog physics, artificial weather modification, etc. important scientific basis. The radiosonde can pass through the cloud layer during the ascent process. Theoretically, the vertical distribution of the cloud (including cloud top, cloud base height, cloud layer thickness, and multilayer cloud vertical distribution). In view of the feasibility of judging cloud heights by using humidity changes in conventional sounding data, researchers at home and abroad have been exploring ways to use sounding data to determine cloud top and cloud base heights. However, at present, the measurement error of the humidity element of the airsonde is still relatively large. The relative humidity actually measured in the cloud layer exceeds 100%, and some is less than 95%. If the relative humidity is 100% or 95% and other specific values Judging whether there is a cloud layer will inevitably result in a certain amount of misjudgment. In addition, in high altitudes, humidity is not the only condition for cloud formation. When the relative humidity exceeds 90%, if other conditions are not met, clouds may not form. Therefore, there is still a large error in judging cloud cover only based on the relative humidity measured by radiosondes.

Contents of the invention

The purpose of the present invention is to provide a cloud top height detection method and device based on the wet bulb effect, which can automatically determine the cloud top height by using the data obtained by the wireless radiosonde during the cloud penetration process.

A further purpose of the present invention is to provide new method and new approach for cloud height determination research.

In order to achieve the above object, the present invention provides a method for detecting cloud top height based on wet bulb effect, comprising:

Raise the radiosonde so that it passes upwards through the clouds;

Acquiring temperature data through a first temperature element and a second temperature element arranged on the radiosonde, the first temperature element is a temperature element that does not absorb moisture on the surface, and the second temperature element is a temperature element that absorbs moisture on the surface;

The time point at which the wet bulb effect occurs is confirmed according to the temperature data, and the height of the radiosonde at the time point at which the wet bulb effect occurs is recorded as the cloud top height.

Optionally, in the above method for detecting cloud top height, the step of confirming the time point when the wet bulb effect is generated according to the temperature data specifically includes:

Obtain the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, calculate the difference between the first temperature value and the second temperature value, and record the occurrence The difference start time corresponding to the difference and the difference confirmation time corresponding to the difference reaching the predetermined threshold;

Determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the initial time of the difference is the wet bulb If the starting point of the effect area is determined, it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated.

Optionally, in the above-mentioned cloud top height detection method, also include:

The predetermined threshold value is adjusted according to the seasonal parameter and the geographic location parameter.

Optionally, in the above cloud top height detection method, the range of the predetermined threshold is 0.5 to 4 degrees Celsius.

The present invention also provides a cloud top height detection device based on the wet bulb effect, comprising:

radiosondes, used to travel upwards through clouds;

The first temperature element is a temperature element whose surface does not absorb moisture, and is arranged on the radiosonde;

The second temperature element is a temperature element that absorbs moisture on the surface, and is arranged on the radiosonde;

The processing unit is configured to: confirm the time point at which the wet bulb effect occurs according to the temperature data collected by the first temperature element and the second temperature element, and convert the time point of the radiosonde at the time point at which the wet bulb effect occurs Heights are recorded as cloud top heights.

Optionally, in the above-mentioned cloud top height detection device, the processing unit includes:

A calculation unit, configured to: acquire the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, and calculate the first temperature value and the second temperature value Record the corresponding difference start time when the difference occurs and the corresponding difference confirmation time when the difference reaches the predetermined threshold value;

The identifying and confirming unit is configured to: determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the difference starts If the starting time is the starting point of the wet bulb effect area, then it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated.

Optionally, in the above-mentioned cloud top height detection device, the processing unit also includes:

The adjustment unit is configured to: adjust the predetermined threshold according to the seasonal parameter and the geographic location parameter.

Optionally, in the above-mentioned cloud top height detecting device, the range of the predetermined threshold is 0.5 to 4 degrees Celsius.

Optionally, in the above-mentioned cloud top height detection device, the temperature element is a bead-shaped aluminum-plated temperature sensor.

Embodiments of the present invention have the following technical effects:

1) In the embodiment of the present invention, the inter-cloud temperature measurement of the radiosonde is carried out through the temperature element whose surface does not absorb moisture and the temperature element whose surface absorbs moisture. The "wet bulb effect" produces an obvious difference. According to the initial moment of this difference, the moment of reaching the cloud top can be accurately judged, so that the height of the cloud top can be obtained according to the height of the radiosonde at the moment of reaching the cloud top. Simple and easy to use, easy to obtain information

2) The embodiment of the present invention can obtain reliable cloud top height data and enrich the information of the sounding data, especially the relevant information about clouds, through the characteristics of the relative humidity and temperature rise curve of the sounding data and the physical characteristics of the cloud, which is a great contribution to the meteorological business. The automatic observation of cloud height provides a new idea and solution.

3) Sounding data is one of the most basic and extensive meteorological observation data, the application of the embodiment of the present invention can enrich the information of the sounding data as a whole, improve the value of the sounding data, and have remarkable social benefits.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is the flow chart of the steps of the method embodiment of the present invention;

Fig. 2 is the temperature and humidity curve diagram of the sounding process of another method embodiment of the present invention;

Fig. 3 is a structural diagram of an embodiment of the device of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, specific embodiments will be described in detail below with reference to the accompanying drawings.

Fig. 1 is the step flowchart of the method embodiment of the present invention, as shown in Fig. 1, the embodiment of the present invention provides a kind of cloud top height detection method based on wet bulb effect, comprising:

Step 110, raising the radiosonde so that the radiosonde passes through the cloud layer upwards;

Step 120, collect temperature data through the first temperature element and the second temperature element arranged on the radiosonde, the first temperature element is a thermometer element with a non-hygroscopic surface, and the second temperature element is a hygroscopic surface element thermometer element;

Step 130, confirm the time point when the wet bulb effect occurs according to the temperature data, and record the height of the radiosonde at the time point when the wet bulb effect occurs as the cloud top height.

Among them, the wet bulb effect usually refers to the cooling effect in the process of water evaporation, and the ground-observing dry-humidity thermometer uses this principle to measure air humidity. The wet and dry thermometer consists of two identical thermometers, one mercury ball is placed in the air, that is, the dry bulb; the other mercury ball is wrapped in gauze, and the extended end of the gauze is immersed in water, that is, the wet bulb. Since the evaporation of water will take away heat, the temperature displayed by the wet bulb thermometer is lower than that of the dry bulb thermometer. This is the "wet bulb effect". Since the evaporation of water is related to the humidity of the air, the greater the air humidity, the smaller the evaporation, the less heat will be taken away, and the smaller the difference in temperature between dry and wet bulbs; the lower the air humidity, the greater the evaporation, and the more heat will be taken away. The larger the temperature difference between the dry and wet bulbs, the greater the temperature difference. Therefore, the change law of the temperature difference between dry and wet bulbs can be used to reflect the current air humidity conditions.

Therefore, in the embodiment of the present invention, the inter-cloud temperature measurement of the radiosonde is carried out through the temperature element/sensor with a non-hygroscopic surface and the temperature element/sensor with a hygroscopic surface. After the radiosonde passes through the cloud top, because the relative humidity in the air suddenly changes Small, the measurement results of the two temperature elements/sensors will have an obvious difference due to the "wet bulb effect". The height of the cloud top is obtained according to the height of the radiosonde at the moment of reaching the cloud top.

It can be seen that the embodiment of the present invention can reliably obtain cloud top heights, is simple and easy to obtain data, and provides a new solution idea and solution for automatic observation of cloud heights in meteorological operations.

In one embodiment of the present invention, the step of confirming the time point when the wet bulb effect occurs according to the temperature data specifically includes:

Obtain the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, calculate the difference between the first temperature value and the second temperature value, and record the occurrence The difference start time corresponding to the difference and the difference confirmation time corresponding to the difference reaching the predetermined threshold;

Determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the initial time of the difference is the wet bulb If the starting point of the effect area is determined, it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated.

Of course, a simplified method can also be used, without confirming the wet bulb effect area, as long as the confirmation time of the difference occurs within a predetermined time period after the start time of the difference, it can be considered that the start time of the difference is all Describe the time point when the wet bulb effect occurs.

Among them, the wet-bulb effect area refers to the process of the temperature profile of the non-hygroscopic first temperature element and the temperature profile of the hygroscopic second temperature element from coincidence to separation to re-coincidence after the radiosonde passes through the cloud top, The area of wet bulb effect is marked by the rectangle dotted line box in Figure 2. Through the graphic identification of the wet bulb effect area, the relative humidity data error caused by the damage of the humidity sensor due to icing can be avoided, thus causing misjudgment in the conventional method of judging the cloud top position by using the relative humidity value, making the judgment of the cloud top position more accurate .

In one embodiment of the present invention, the surface of the first temperature element is provided with a waterproof coating. The surface of the first temperature element is made non-hygroscopic by providing a waterproof coating. And the surface of the first temperature element can not be treated, it will be affected by humidity, of course, in order to increase the sensitivity to humidity, the surface of the first temperature element can be provided with hygroscopic material, such as gauze, and the element surface is coated with white paint , increase the surface roughness to improve the moisture absorption effect and the like, so as to increase the contrast effect.

In one embodiment of the present invention, the predetermined threshold ranges from 0.5 to 4 degrees Celsius. Preferably, the predetermined threshold value is selected as 2 degrees Celsius, because the temperature difference between the two thermometers reaches 2 degrees Celsius, which is enough to eliminate the possibility of misjudgment caused by measurement errors, and it can be reliably determined that the cloud top has been reached.

It should be pointed out that there is no fixed value for the predetermined threshold, which depends on the season of releasing the radiosonde and the position of the cloud top. Therefore, in one embodiment of the present invention, it also includes: adjusting according to the seasonal parameters and geographic location parameters The predetermined threshold value.

This is because: after the two temperature elements leave the cloud top, there will be a temperature difference due to the wet bulb effect. This predetermined threshold depends on the season when the radiosonde is deployed and the position of the cloud top. The example in Figure 2 is Shanghai summer For example, the ground temperature is high and the cloud top height is low, so the temperature difference caused by the wet bulb effect is relatively large. If it is winter in the north, the ground temperature is relatively low, and the temperature difference at the cloud top height is relatively small, maybe only a few tenths degrees, so the magnitude of the temperature difference cannot be specifically determined.

For example, in a release record in Shanxi on November 1, 2013, after passing through the clouds, temperature 1 (waterproof coating) was -8.94°C, temperature 2 (no waterproof coating) was -9.7°C, and the two temperatures The maximum magnitude of the difference is only 0.74°C.

Fig. 2 is the temperature and humidity curve diagram of the sounding process of another method embodiment of the present invention; Due to the temperature element (second temperature element) of the sounding instrument not coated with waterproof coating, it is easy to collect water in the process of passing through the clouds, and it is easy to collect water when flying out. After the cloud top, due to the sudden decrease in the relative humidity of the surrounding air, water evaporates, causing the temperature element to cool down, and the temperature measured by it will suddenly be lower than that of the conventional temperature element. The embodiment of the present invention uses this phenomenon to judge the height of the cloud top.

As shown in Figure 2, it is a temperature and humidity curve during a radiosonde. The radiosonde carries two temperature elements (the first temperature element with waterproof coating and the second temperature element without waterproof coating). In the figure, the temperature profile measured by the radiosonde is in the left box, and the relative humidity profile is in the right box. On the temperature profile diagram, we can see the difference between the temperature measured by the first temperature element with a good waterproof effect and the temperature not made. The temperature measured by the waterproof second temperature element has obvious difference at the position of the cloud top, that is, the temperature measured by the non-waterproof temperature element is obviously lower than the temperature measured by the temperature element with good waterproof effect, and then the temperature of the two recovers gradually Consistent (the area of wet bulb effect is marked by the rectangle dotted box in Figure 2).

As shown in Figure 2: the position of the cloud top recorded during the sounding process appeared approximately 350 seconds after the launch of the radiosonde. From the radiosonde temperature curve in the left figure, it can be seen that no matter whether the temperature element is waterproof or not, the radiosonde After the release, the temperature measured by the temperature element carried by it all showed a consistent downward trend, down to 12.5°C. Subsequently, the temperature measured by the temperature element with a waterproof coating that was not affected by the water droplets in the cloud rose from 12.5°C to 16°C. ℃, the temperature measured by the temperature element without waterproof coating is obviously lower than the temperature measured by the temperature element with good waterproof effect. After 25 seconds the change in temperature profile is consistent with that measured by a temperature element with a waterproof coating. It is obvious that when the radiosonde is out of the clouds, the temperature measured by the temperature elements with different waterproof treatments is significantly different. The temperature measured without waterproof treatment will be higher than that measured by the conventional temperature element with waterproof coating. The phenomenon of low temperature, and in the actual sounding process, the starting position of this phenomenon is consistent with the position of the cloud top, so the embodiment of the present invention proposes to add a non-waterproof coating on the conventional weather service radiosonde based on this phenomenon. A method to identify cloud tops by layer temperature element.

Fig. 3 is a structural diagram of an embodiment of the device of the present invention. As shown in Figure 3, an embodiment of the present invention provides a cloud top height detection device based on the wet bulb effect, including:

a radiosonde 210 for upward travel through the clouds;

The first temperature element 220 is a temperature element whose surface does not absorb moisture, and is arranged on the radiosonde;

The second temperature element 230 is a temperature element that absorbs moisture on the surface, and is arranged on the radiosonde;

The processing unit 240 is configured to: confirm the time point at which the wet bulb effect occurs according to the temperature data collected by the first temperature element and the second temperature element, and convert the radiosonde at the time point at which the wet bulb effect occurs The height of is recorded as the cloud top height.

In another device embodiment of the present invention, the processing unit includes:

A calculation unit, configured to: acquire the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, and calculate the first temperature value and the second temperature value Record the corresponding difference start time when the difference occurs and the corresponding difference confirmation time when the difference reaches the predetermined threshold value;

The identifying and confirming unit is configured to: determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the difference starts If the starting time is the starting point of the wet bulb effect area, then it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated.

In another device embodiment of the present invention, the processing unit further includes: an adjusting unit, configured to: adjust the predetermined threshold according to a seasonal parameter and a geographic location parameter.

In another device embodiment of the present invention, the surface of the first temperature element is provided with a waterproof coating. The predetermined threshold ranges from 0.5 to 4 degrees Celsius. The temperature element is a bead-shaped aluminum-plated temperature sensor, of course, it can also be any temperature sensor that can produce a wet bulb effect.

In the device embodiment of the present invention, conventional radiosondes used in meteorological operations can be used, including air pressure sensors, humidity sensors, and temperature sensor elements with waterproof coatings, to obtain temperature, pressure, and humidity data in the atmosphere, The temperature element is added with a waterproof coating to avoid the wet bulb effect and to measure the accurate atmospheric temperature. The device embodiment of the present invention is to add a temperature element without a waterproof coating on the basis of a conventional radiosonde. After the radiosonde enters the cloud, the surface of the temperature element without a waterproof coating will absorb moisture. When the radiosonde leaves the cloud layer , due to the sudden decrease in the relative humidity of the surrounding air causing water to evaporate, its temperature will suddenly be much lower than that of conventional (with waterproof coating) temperature elements (the lower range is related to the relative humidity of the air above the cloud top), and then gradually Close to conventional temperature elements. Therefore, when the "wet bulb effect" occurs, the radiosonde must pass the top position of the cloud layer. The embodiment of the device of the present invention is a new device for judging the height of the cloud top by using the special change law of the temperature measurement value caused by the "wet bulb effect" of the temperature element without waterproof coating. The criterion for discriminating the cloud top in the embodiment of the present invention is the special change process of the temperature difference between the temperature element without waterproof coating and the temperature element with waterproof coating, which has nothing to do with the relative humidity of the cloud layer detected by the radiosonde, which avoids The error of the conventional discriminant method. Since the "wet bulb effect" only occurs when the radiosonde is out of the cloud, it can accurately determine the height of the cloud top.

It can be seen from the above that the embodiments of the present invention have the following advantages:

1) In the embodiment of the present invention, the inter-cloud temperature measurement of the radiosonde is carried out through the temperature element/sensor whose surface does not absorb moisture and the temperature element/sensor whose surface absorbs moisture. When reaching the top of the cloud, because the humidity in the air changes, the measurement of the two thermometers As a result, there will be an obvious difference due to the "wet bulb effect". According to the magnitude of this difference and the initial moment of appearance, the time of reaching the cloud top can be accurately grasped, and the height of the cloud top can be obtained according to the height of the radiosonde at the moment of reaching the cloud top. Simple and easy to use, easy to obtain information

2) The embodiment of the present invention can obtain reliable cloud top height data and enrich the information of the sounding data, especially the relevant information about clouds, through the characteristics of the relative humidity and temperature rise curve of the sounding data and the physical characteristics of the cloud, which is a great contribution to the meteorological business. The automatic observation of cloud height provides a new idea and solution.

3) Sounding data is one of the most basic and extensive meteorological observation data, the application of the embodiment of the present invention can enrich the information of the sounding data as a whole, improve the value of the sounding data, and have remarkable social benefits.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (6)

1. A cloud top height detection method based on the wet bulb effect, comprising: Raise the radiosonde so that it passes upwards through the clouds; Acquiring temperature data through a first temperature element and a second temperature element arranged on the radiosonde, the first temperature element is a temperature element that does not absorb moisture on the surface, and the second temperature element is a temperature element that absorbs moisture on the surface; Confirm the time point of producing wet bulb effect according to the temperature data, and record the altitude of the radiosonde at the time point of producing wet bulb effect as cloud top height; Wherein, the step of confirming the time point of generating the wet bulb effect according to the temperature data specifically includes: Obtain the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, calculate the difference between the first temperature value and the second temperature value, and record the occurrence The difference start time corresponding to the difference and the difference confirmation time corresponding to the difference reaching the predetermined threshold; Determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the initial time of the difference is the wet bulb If the starting point of the effect area is determined, it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated. 2. cloud top height detection method according to claim 1, is characterized in that, also comprises: The predetermined threshold value is adjusted according to the seasonal parameter and the geographic location parameter. 3. The cloud top height detecting method according to claim 2, characterized in that, the range of the predetermined threshold is 0.5 to 4 degrees Celsius. 4. A cloud top height detection device based on wet bulb effect, characterized in that, comprising: radiosondes, used to travel upwards through clouds; The first temperature element is a temperature element whose surface does not absorb moisture, and is arranged on the radiosonde; The second temperature element is a temperature element that absorbs moisture on the surface, and is arranged on the radiosonde; The processing unit is configured to: confirm the time point at which the wet bulb effect occurs according to the temperature data collected by the first temperature element and the second temperature element, and convert the time point of the radiosonde at the time point at which the wet bulb effect occurs Heights are recorded as cloud top heights; Wherein, the processing unit includes: A calculation unit, configured to: acquire the first temperature value collected by the first temperature element and the second temperature value collected by the second temperature element at the same time, and calculate the first temperature value and the second temperature value Record the corresponding difference start time when the difference occurs and the corresponding difference confirmation time when the difference reaches the predetermined threshold value; The identifying and confirming unit is configured to: determine the wet bulb effect area according to the temperature profile collected by the first temperature element, the temperature profile collected by the second temperature element, and the confirmation time of the difference, if the difference starts If the starting time is the starting point of the wet bulb effect area, then it is confirmed that the starting time of the difference is the time point when the wet bulb effect is generated. 5. cloud top height detecting device according to claim 4, is characterized in that, described processing unit also comprises: The adjustment unit is configured to: adjust the predetermined threshold according to the seasonal parameter and the geographic location parameter. 6. The cloud top height detecting device according to claim 5, characterized in that, the range of the predetermined threshold is 0.5 to 4 degrees Celsius.