Evaluation of Sentinel-5P TROPOMI Methane Observations at Northern High Latitudes
<p>Locations of the high-latitude TCCON, COCCON, and AirCore sites overlaid on a map of the regional permafrost extent re-gridded from ESA CCI Permafrost data. Regions with >90% permafrost extent are considered continuous permafrost.</p> "> Figure 2
<p>Effect of the COCCON prior correction on TROPOMI OPER rpro (blue) and WFMD v1.8 (red) daily median XCH<sub>4</sub> at (<b>a</b>) Kiruna, Sweden, (<b>b</b>) SN039 and (<b>c</b>) SN122 in Sodankylä, Finland, (<b>d</b>) Fairbanks, Alaska, USA, and (<b>e</b>) St. Petersburg, Russia.</p> "> Figure 3
<p>Spatial variability of monthly-averaged total column methane for TROPOMI OPER rpro (<b>left</b>) and WFMD v1.8 (<b>right</b>) for April, August, and October in 2020. The grid size is 0.25° × 0.2°.</p> "> Figure 4
<p>Spatial variability of the difference in monthly-averaged total column methane for TROPOMI OPER rpro and WFMD v1.8 in 2020. The grid size is 0.25° × 0.2°.</p> "> Figure 5
<p>Temporal dependence of (<b>a</b>) TROPOMI OPER rpro–WFMD v1.8 XCH<sub>4</sub> difference, (<b>b</b>) TROPOMI OPER–OPER rpro XCH<sub>4</sub> difference, and (<b>c</b>) TROPOMI WFMD v1.2–WFMD v1.8 XCH<sub>4</sub> difference, colored based on 5-degree latitude bands north of 50°N. Gaps represent missing data.</p> "> Figure 6
<p>Averages of (<b>a</b>) TROPOMI OPER rpro–WFMD v1.8 XCH<sub>4</sub> difference, (<b>b</b>) TROPOMI OPER–OPER rpro XCH<sub>4</sub> difference, and (<b>c</b>) TROPOMI WFMD v1.2–WFMD v1.8 XCH<sub>4</sub> difference for different latitude bands. The error bars denote the standard deviation. Colored circles denote the mean difference of the satellite product to the ground-based TCCON instrument (GGG2020 retrieval) located in that latitude band.</p> "> Figure 7
<p>Seasonal dependence of the number of TROPOMI observations over different permafrost regions for (<b>a</b>) OPER, (<b>b</b>) OPER rpro, (<b>c</b>) WFMD v1.2, and (<b>d</b>) WFMD v1.8. The colors refer to different permafrost classes, determined using the ESA Permafrost CCI Level 4 product.</p> "> Figure 8
<p>Daily median XCH<sub>4</sub> from TCCON GGG2020 (blue) and co-located TROPOMI (red) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–TCCON differences (<b>b</b>,<b>d</b>) at Eureka, Canada. The dashed line in (<b>b</b>,<b>d</b>) shows the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure 9
<p>Daily median XCH<sub>4</sub> from TCCON GGG2020 (blue) and co-located TROPOMI (red) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–TCCON differences (<b>b</b>,<b>d</b>) at Ny-Ålesund, Norway. The dashed line in (<b>b</b>,<b>d</b>) shows the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure 10
<p>Daily median XCH<sub>4</sub> from TCCON GGG2020 (blue) and co-located TROPOMI (red) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–TCCON differences (<b>b</b>,<b>d</b>) at Sodankylä, Finland. The dashed line in (<b>b</b>,<b>d</b>) shows the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure 11
<p>Daily median XCH<sub>4</sub> from TCCON GGG2020 (blue) and co-located TROPOMI (red) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–TCCON differences (<b>b</b>,<b>d</b>) at East Trout Lake, Canada. The dashed line in (<b>b</b>,<b>d</b>) shows the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure 12
<p>Comparison of TROPOMI–TCCON mean XCH<sub>4</sub> differences for TCCON GGG2014 and TCCON GGG2020, considering TROPOMI (<b>a</b>) OPER rpro and (<b>b</b>) WFMD v1.8 products. The TCCON data have been selected to include only the days for which both processing versions yield good-quality retrievals, so their temporal sampling is identical.</p> "> Figure 13
<p>Daily median XCH<sub>4</sub> from COCCON (red) and co-located TROPOMI (blue) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–COCCON differences (<b>b</b>,<b>d</b>) at Kiruna, Sweden. The dashed line in (<b>b</b>,<b>d</b>) shows the mean differences and the shaded area denotes one standard deviation from the mean.</p> "> Figure 14
<p>Daily median XCH<sub>4</sub> from COCCON (red) and co-located TROPOMI (blue) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–COCCON differences (<b>b</b>,<b>d</b>) at Sodankylä, Finland (SN039). The dashed line in (<b>b</b>,<b>d</b>) shows the mean differences and the shaded area denotes one standard deviation from the mean.</p> "> Figure 15
<p>Daily median XCH<sub>4</sub> from COCCON (red) and co-located TROPOMI (blue) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–COCCON differences (<b>b</b>,<b>d</b>) at Sodankylä, Finland (SN122). The dashed line in (<b>b</b>,<b>d</b>) shows the mean differences and the shaded area denotes one standard deviation from the mean.</p> "> Figure 16
<p>Daily median XCH<sub>4</sub> from COCCON (green) and co-located TROPOMI (orange) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–COCCON differences (<b>b</b>,<b>d</b>) at Fairbanks, Alaska, USA. The dashed line in (<b>b</b>,<b>d</b>) shows the mean differences and the shaded area denotes one standard deviation from the mean.</p> "> Figure 17
<p>Daily median XCH<sub>4</sub> from COCCON (ref) and co-located TROPOMI (blue) (<b>a</b>) OPER rpro and (<b>c</b>) WFMD v1.8 retrievals, and TROPOMI–COCCON differences (<b>b</b>,<b>d</b>) at St. Petersburg, Russia. The dashed line in (<b>b</b>,<b>d</b>) shows the mean differences and the shaded area denotes one standard deviation from the mean.</p> "> Figure 18
<p>Comparison of measured AirCore profiles (black curves), TCCON GGG2020 prior profiles (red), and TROPOMI prior profiles: (<b>a</b>) TROPOMI OPER rpro (blue), and (<b>c</b>) TROPOMI WFMD v1.8 (orange) prior profiles. The TROPOMI prior profiles are also scaled (dashed lines) so that the profile corresponds to each retrieved XCH<sub>4</sub>. The difference of the scaled profile compared to the measured concentration is also shown: (<b>b</b>) OPER rpro–AirCore, and (<b>d</b>) WFMD v1.8–AirCore.</p> "> Figure 19
<p>Collection of the AirCore XCH<sub>4</sub> results with co-located TCCON GGG2020 and TROPOMI observations.</p> "> Figure 20
<p>Collection of the TROPOMI high-latitude evaluation results obtained in this paper. The bar plots show the average difference of TROPOMI (OPER rpro or WFMD v1.8 product) and ground-based references, and the error bars depict the standard deviation. The references from left to right are TCCON stations at East Trout Lake, Sodankylä, Ny-Ålesund, and Eureka, then COCCON stations at St. Petersburg, Fairbanks, Sodankylä (SN039 and SN122), and Kiruna, and AirCore measurements at Sodankylä. It should be noted that the temporal sampling differs between the references.</p> "> Figure A1
<p>TCCON GGG2020 (blue) and co-located TROPOMI daily median XCH<sub>4</sub> (red) with (<b>a</b>) OPER and (<b>c</b>) WFMD v1.2 retrievals, and TROPOMI−TCCON differences (<b>b</b>,<b>d</b>) at Eureka (Canada) TCCON site. The dashed line in (<b>b</b>,<b>d</b>) show the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure A2
<p>TCCON GGG2020 (blue) and co-located TROPOMI daily median XCH<sub>4</sub> (red) with (<b>a</b>) OPER and (<b>c</b>) WFMD v1.2 retrievals, and TROPOMI−TCCON differences (<b>b</b>,<b>d</b>) at Ny-Ålesund (Norway) TCCON site. The dashed line in (<b>b</b>,<b>d</b>) show the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure A3
<p>TCCON GGG2020 (blue) and co-located TROPOMI daily median XCH<sub>4</sub> (red) with (<b>a</b>) OPER and (<b>c</b>) WFMD v1.2 retrievals, and TROPOMI−TCCON differences (<b>b</b>,<b>d</b>) at Sodankylä (Finland) TCCON site. The dashed line in (<b>b</b>,<b>d</b>) show the mean difference at the site and shaded area the standard deviation of the mean.</p> "> Figure A4
<p>TCCON GGG2020 (blue) and co-located TROPOMI daily median XCH<sub>4</sub> (red) with (<b>a</b>) OPER and (<b>c</b>) WFMD v1.2 retrievals, and TROPOMI−TCCON differences (<b>b</b>,<b>d</b>) at East Trout Lake (Canada) TCCON site. The dashed line in (<b>b</b>,<b>d</b>) show the mean difference at the site and shaded area the standard deviation of the mean.</p> ">
Abstract
:1. Introduction
2. Data Description
2.1. TROPOMI XCH4 OPER and OPER Rpro Products
2.2. TROPOMI XCH4 WFMD Products
2.3. TCCON Sites and XCH4 Products
2.4. COCCON XCH4 Product
2.5. AirCore CH4 Profiles
2.6. Permafrost Extent
3. Methods
3.1. Co-Location at TCCON and COCCON Sites
3.2. Prior Correction
3.3. Co-Location and Analysis against AirCore Measurements
4. Results and Discussion
4.1. Seasonal and Regional Coverage
4.1.1. Spatial Comparison of TROPOMI Products
4.1.2. Latitudinal Comparisons
4.1.3. Coverage of TROPOMI at High Latitudes
4.2. TROPOMI Evaluation at the TCCON Sites
4.2.1. TROPOMI XCH4 Evaluation against TCCON GGG2020
4.2.2. Comparison of TCCON GGG2014 and TCCON GGG2020
4.3. Evaluation at the COCCON Sites
4.4. AirCore Comparisons
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A. TROPOMI OPER and WFMD v1.2 Time Series at the TCCON Sites
Appendix B. Tabulated Daily Median XCH4 Differences
East Trout Lake | Sodankylä | Ny-Ålesund | Eureka | |
---|---|---|---|---|
N, OPER rpro | 462 | 270 | 48 | 79 |
Bias (ppb), OPER rpro | 3.30 | −0.47 | 7.54 | 22.42 |
(ppb), OPER rpro | 15.45 | 20.43 | 16.7 | 12.98 |
r, OPER rpro | 0.604 | 0.415 | 0.494 | 0.761 |
N, WFMD v1.8 | 520 | 234 | 66 | 113 |
Bias (ppb), WFMD v1.8 | 4.61 | 1.17 | 9.17 | 19.41 |
(ppb), WFMD v1.8 | 14.97 | 12.51 | 14.66 | 13.37 |
r, WFMD v1.8 | 0.744 | 0.707 | 0.847 | 0.643 |
N, OPER | 444 | 259 | 34 | 56 |
Bias (ppb), OPER | 4.22 | −6.42 | 32.81 | 36.25 |
(ppb), OPER | 18.72 | 17.61 | 13.96 | 18.30 |
N, WFMD v1.2 | 377 | 172 | 64 | 126 |
Bias (ppb), WFMD v1.2 | 5.54 | −1.43 | 4.79 | 19.98 |
(ppb), WFMD v1.2 | 16.97 | 16.83 | 26.78 | 16.52 |
East Trout Lake | Sodankylä | Ny-Ålesund | Eureka | |
---|---|---|---|---|
N, OPER rpro | 363 | 295 | 44 | 77 |
Bias (ppb), GGG2014 | −3.8 | −12.9 | −1.7 | 6.3 |
(ppb), GGG2014 | 15.3 | 19.4 | 17.8 | 10.5 |
Bias (ppb), GGG2020 | 3.3 | −6.3 | 5.6 | 21.9 |
(ppb), GGG2020 | 16.6 | 19.9 | 18.3 | 10.3 |
N, WFMD v1.8 | 416 | 249 | 46 | 94 |
Bias (ppb), GGG2014 | 0.8 | −4.3 | − 0.9 | 9.0 |
(ppb), GGG2014 | 14.2 | 12.3 | 18.0 | 13.1 |
Bias (ppb), GGG2020 | 8.9 | 3.3 | 10.5 | 25.3 |
(ppb), GGG2020 | 15.3 | 13.0 | 20.1 | 14.1 |
Kiruna | Sodankylä (SN039) | Sodankylä (SN122) | Fairbanks | St. Petersburg | |
---|---|---|---|---|---|
N, OPER rpro | 125 | 97 | 40 | 205 | 15 |
Bias (ppb), OPER rpro | −14.81 | −6.74 | −6.32 | 5.62 | −26.51 |
(ppb), OPER rpro | 14.36 | 16.02 | 13.96 | 14.61 | 28.73 |
r, OPER rpro | 0.561 | 0.368 | 0.750 | 0.712 | 0.118 |
N, WFMD v1.8 | 132 | 78 | 27 | 188 | 27 |
Bias (ppb), WFMD v1.8 | −5.03 | −0.03 | −3.79 | 17.23 | 2.67 |
(ppb), WFMD v1.8 | 12.94 | 11.54 | 13.02 | 12.05 | 11.45 |
r, WFMD v1.8 | 0.734 | 0.576 | 0.595 | 0.819 | 0.623 |
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Lindqvist, H.; Kivimäki, E.; Häkkilä, T.; Tsuruta, A.; Schneising, O.; Buchwitz, M.; Lorente, A.; Martinez Velarte, M.; Borsdorff, T.; Alberti, C.; et al. Evaluation of Sentinel-5P TROPOMI Methane Observations at Northern High Latitudes. Remote Sens. 2024, 16, 2979. https://doi.org/10.3390/rs16162979
Lindqvist H, Kivimäki E, Häkkilä T, Tsuruta A, Schneising O, Buchwitz M, Lorente A, Martinez Velarte M, Borsdorff T, Alberti C, et al. Evaluation of Sentinel-5P TROPOMI Methane Observations at Northern High Latitudes. Remote Sensing. 2024; 16(16):2979. https://doi.org/10.3390/rs16162979
Chicago/Turabian StyleLindqvist, Hannakaisa, Ella Kivimäki, Tuomas Häkkilä, Aki Tsuruta, Oliver Schneising, Michael Buchwitz, Alba Lorente, Mari Martinez Velarte, Tobias Borsdorff, Carlos Alberti, and et al. 2024. "Evaluation of Sentinel-5P TROPOMI Methane Observations at Northern High Latitudes" Remote Sensing 16, no. 16: 2979. https://doi.org/10.3390/rs16162979