... The wave was amplified as the storm moved nearly parallel to the shelf and at comparable spee... more ... The wave was amplified as the storm moved nearly parallel to the shelf and at comparable speed to the wave phase speed. ... Citation: Morey, SL, S. Baig, MA Bourassa, DS Dukhovskoy, and JJ O'Brien (2006), Remote forcing contribution to storm-induced sea level rise during ...
SeaWinds scatterometer-derived wind fields can be used to estimate surface pressure fields. The m... more SeaWinds scatterometer-derived wind fields can be used to estimate surface pressure fields. The method to be used has been developed and tested with Seasat-A and NSCAT wind measurements. The method involves blending two dynamically consistent values of vorticity. Geostrophic relative vorticity is calculated from an initial guess surface pressure field (AVN analysis in this case). Relative vorticity is calculated from
The surface turbulent fluxes (sensible heat, latent heat, and stress) are an important mechanism ... more The surface turbulent fluxes (sensible heat, latent heat, and stress) are an important mechanism by which the atmosphere interacts with the ocean. For example, the air-sea exchange of heat plays an important role in driving the large scale atmospheric circulation as well as regulating the sea surface temperature. Wind stress at the surface is an important driving force for ocean
High-resolution ocean surface wind velocity data derived from satellite observations are used to ... more High-resolution ocean surface wind velocity data derived from satellite observations are used to analyze winds in the Nordic Seas. For the analysis, a Cross-Calibrated, Multi-Platform (CCMP), multi-instrument ocean surface wind velocity data set is utilized. The ocean surface wind fields are compared with those derived from the National Centers for Environmental Protection/National Center for Atmospheric Research (NCEP/NCAR) reanalysis. The NCEP/NCAR
ABSTRACT Data from several satellite passes can be combined to produce surface vector wind fields... more ABSTRACT Data from several satellite passes can be combined to produce surface vector wind fields for the bulk of the storm. A wide range of gridding techniques and assumptions can be used to produce these gridded wind fields, each with substantial strengths and weaknesses. For example, numerical weather prediction (NWP) tools can be used to assimilate the satellite data, and to advect information to a common time. However, such models tend to have rather poor boundary-layer physics, and imposed physical assumptions rarely work well for severe weather. These problems are much worse in the tropics than in mid-latitudes; however, they remain a serious problem for warm core seclusions (mid-latitude storms with a core that is warm relative to its surroundings), which are extremely powerful storms. Another problem with these storms is that they tend to translate very rapidly and change their structure on short time scales compared to NWP output. These rapid changes hamper traditional objective analysis techniques, greatly limiting the time window for which data can be usefully assimilated. Data from adjacent scatterometer passes (less than two hours difference) have been used with some success in the representation of patterns for wind speed and direction. Spatial derivative of wind vectors are often of more interest for ocean and atmospheric dynamics. In this study, the vorticity field (the curl of the winds) is investigated in the context of warm core seclusions. The vorticity is calculated in the individual swaths (prior to regridding), and in the gridded product.
ABSTRACT A subset of modeled diurnally varying sea surface temperatures is compared to geostation... more ABSTRACT A subset of modeled diurnally varying sea surface temperatures is compared to geostationary satellite sea surface temperature data in order to evaluate how well the model computes the diurnal cycle. By analyzing the satellite coverage of sea surface temperatures, a small set of grid points are selected to compare the evolution of the diurnal cycle to the model data over the course of a day. Overall, the model overestimates the peak of the diurnal cycle as compared to the satellite data, although the pre-dawn and post-sunset temperatures are fairly similar. Since the difference averaged over all hours of the day is small, the model is believed to estimate the total heat content in the upper layers of the ocean correctly, but needs some adjusting to broaden the heating cycle.
... The wave was amplified as the storm moved nearly parallel to the shelf and at comparable spee... more ... The wave was amplified as the storm moved nearly parallel to the shelf and at comparable speed to the wave phase speed. ... Citation: Morey, SL, S. Baig, MA Bourassa, DS Dukhovskoy, and JJ O'Brien (2006), Remote forcing contribution to storm-induced sea level rise during ...
SeaWinds scatterometer-derived wind fields can be used to estimate surface pressure fields. The m... more SeaWinds scatterometer-derived wind fields can be used to estimate surface pressure fields. The method to be used has been developed and tested with Seasat-A and NSCAT wind measurements. The method involves blending two dynamically consistent values of vorticity. Geostrophic relative vorticity is calculated from an initial guess surface pressure field (AVN analysis in this case). Relative vorticity is calculated from
The surface turbulent fluxes (sensible heat, latent heat, and stress) are an important mechanism ... more The surface turbulent fluxes (sensible heat, latent heat, and stress) are an important mechanism by which the atmosphere interacts with the ocean. For example, the air-sea exchange of heat plays an important role in driving the large scale atmospheric circulation as well as regulating the sea surface temperature. Wind stress at the surface is an important driving force for ocean
High-resolution ocean surface wind velocity data derived from satellite observations are used to ... more High-resolution ocean surface wind velocity data derived from satellite observations are used to analyze winds in the Nordic Seas. For the analysis, a Cross-Calibrated, Multi-Platform (CCMP), multi-instrument ocean surface wind velocity data set is utilized. The ocean surface wind fields are compared with those derived from the National Centers for Environmental Protection/National Center for Atmospheric Research (NCEP/NCAR) reanalysis. The NCEP/NCAR
ABSTRACT Data from several satellite passes can be combined to produce surface vector wind fields... more ABSTRACT Data from several satellite passes can be combined to produce surface vector wind fields for the bulk of the storm. A wide range of gridding techniques and assumptions can be used to produce these gridded wind fields, each with substantial strengths and weaknesses. For example, numerical weather prediction (NWP) tools can be used to assimilate the satellite data, and to advect information to a common time. However, such models tend to have rather poor boundary-layer physics, and imposed physical assumptions rarely work well for severe weather. These problems are much worse in the tropics than in mid-latitudes; however, they remain a serious problem for warm core seclusions (mid-latitude storms with a core that is warm relative to its surroundings), which are extremely powerful storms. Another problem with these storms is that they tend to translate very rapidly and change their structure on short time scales compared to NWP output. These rapid changes hamper traditional objective analysis techniques, greatly limiting the time window for which data can be usefully assimilated. Data from adjacent scatterometer passes (less than two hours difference) have been used with some success in the representation of patterns for wind speed and direction. Spatial derivative of wind vectors are often of more interest for ocean and atmospheric dynamics. In this study, the vorticity field (the curl of the winds) is investigated in the context of warm core seclusions. The vorticity is calculated in the individual swaths (prior to regridding), and in the gridded product.
ABSTRACT A subset of modeled diurnally varying sea surface temperatures is compared to geostation... more ABSTRACT A subset of modeled diurnally varying sea surface temperatures is compared to geostationary satellite sea surface temperature data in order to evaluate how well the model computes the diurnal cycle. By analyzing the satellite coverage of sea surface temperatures, a small set of grid points are selected to compare the evolution of the diurnal cycle to the model data over the course of a day. Overall, the model overestimates the peak of the diurnal cycle as compared to the satellite data, although the pre-dawn and post-sunset temperatures are fairly similar. Since the difference averaged over all hours of the day is small, the model is believed to estimate the total heat content in the upper layers of the ocean correctly, but needs some adjusting to broaden the heating cycle.
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