Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles
<p>AirCore in situ vertical profiles sample the atmosphere from near the surface to the lower stratosphere, making them ideal for the validation of satellite tropospheric trace gas data. Here we present intercomparison results of AirCore carbon monoxide (CO) measurements with respect to retrie...
| Asıl Yazarlar: | , , , , , , , |
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| Materyal Türü: | Makale |
| Dil: | English |
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Copernicus Publications
2022-08-01
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| Seri Bilgileri: | Atmospheric Measurement Techniques |
| Online Erişim: | https://amt.copernicus.org/articles/15/4751/2022/amt-15-4751-2022.pdf |
| _version_ | 1828322888554381312 |
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| author | S. Martínez-Alonso M. N. Deeter B. C. Baier B. C. Baier K. McKain K. McKain H. Worden T. Borsdorff C. Sweeney I. Aben |
| author_facet | S. Martínez-Alonso M. N. Deeter B. C. Baier B. C. Baier K. McKain K. McKain H. Worden T. Borsdorff C. Sweeney I. Aben |
| author_sort | S. Martínez-Alonso |
| collection | DOAJ |
| description | <p>AirCore in situ vertical profiles sample the atmosphere from near the surface to the lower stratosphere, making them ideal for the validation of satellite tropospheric trace gas data. Here we present intercomparison results of AirCore carbon monoxide (CO) measurements with respect to retrievals from MOPITT (Measurements of Pollution In The Troposphere; version 8) and TROPOMI (TROPOspheric Monitoring Instrument), on board the NASA Terra and ESA Sentinel 5-Precursor satellites, respectively. Mean MOPITT/AirCore total column bias values and their standard deviation (0.4 <span class="inline-formula">±</span> 5.5, 1.7 <span class="inline-formula">±</span> 5.6, and 0.7 <span class="inline-formula">±</span> 6.0 for MOPITT thermal-infrared, near-infrared, and multispectral retrievals, respectively; all in %)
are similar to results obtained in MOPITT/NOAA aircraft flask data comparisons from this study and from previous validation efforts. MOPITT CO retrievals are systematically validated using in situ vertical profiles from a variety of aircraft campaigns. Because most aircraft vertical profiles do not sample the troposphere's entire vertical extent, they must be extended upwards in order to be usable in validation. Here we quantify, for the first time, the error introduced in MOPITT CO validation by the use of shorter aircraft vertical profiles extended upwards by analyzing validation results of MOPITT with respect to full and truncated AirCore CO vertical profiles. Our results indicate that the error is small, affects mostly upper tropospheric retrievals (at 300 hPa: <span class="inline-formula">∼</span> 2.6, 0.8, and 3.2 percent points for MOPITT thermal-infrared, near-infrared, and multispectral, respectively), and may have resulted in the overestimation of MOPITT retrieval biases in that region. TROPOMI can retrieve CO under both clear and cloudy conditions. The latter is achieved by quantifying interfering trace gases and parameters describing the cloud contamination of the measurements together with the CO column; then, the reference CO profiles used in the retrieval are scaled based on estimated above-cloud CO rather than on estimated total CO. We use AirCore measurements as the reference to evaluate the error introduced by this approach in cloudy TROPOMI retrievals over land after accounting for TROPOMI's vertical sensitivity to CO (relative bias and its standard deviation <span class="inline-formula">=</span> 2.02 % <span class="inline-formula">±</span> 11.13 %). We also quantify the null-space error, which accounts for differences between the shape of TROPOMI reference profiles and that of AirCore measured profiles (for TROPOMI cloudy <span class="inline-formula"><i>e</i><sub>null</sub>=0.98</span> % <span class="inline-formula">±</span> 2.32 %).</p> |
| first_indexed | 2024-04-13T18:46:48Z |
| format | Article |
| id | doaj.art-02e433acb4b14b6b9e29ac6f82d49cc8 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-04-13T18:46:48Z |
| publishDate | 2022-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-02e433acb4b14b6b9e29ac6f82d49cc82022-12-22T02:34:34ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482022-08-01154751476510.5194/amt-15-4751-2022Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profilesS. Martínez-Alonso0M. N. Deeter1B. C. Baier2B. C. Baier3K. McKain4K. McKain5H. Worden6T. Borsdorff7C. Sweeney8I. Aben9Atmospheric Chemistry Observations and Modeling (ACOM), National Center for Atmospheric Research (NCAR), Boulder, CO, USAAtmospheric Chemistry Observations and Modeling (ACOM), National Center for Atmospheric Research (NCAR), Boulder, CO, USAGlobal Monitoring Laboratory (GML), National Oceanic and Atmospheric Administration, Boulder, CO, USACooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USAGlobal Monitoring Laboratory (GML), National Oceanic and Atmospheric Administration, Boulder, CO, USACooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USAAtmospheric Chemistry Observations and Modeling (ACOM), National Center for Atmospheric Research (NCAR), Boulder, CO, USASRON Netherlands Institute for Space Research, Leiden, the NetherlandsCooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USASRON Netherlands Institute for Space Research, Leiden, the Netherlands<p>AirCore in situ vertical profiles sample the atmosphere from near the surface to the lower stratosphere, making them ideal for the validation of satellite tropospheric trace gas data. Here we present intercomparison results of AirCore carbon monoxide (CO) measurements with respect to retrievals from MOPITT (Measurements of Pollution In The Troposphere; version 8) and TROPOMI (TROPOspheric Monitoring Instrument), on board the NASA Terra and ESA Sentinel 5-Precursor satellites, respectively. Mean MOPITT/AirCore total column bias values and their standard deviation (0.4 <span class="inline-formula">±</span> 5.5, 1.7 <span class="inline-formula">±</span> 5.6, and 0.7 <span class="inline-formula">±</span> 6.0 for MOPITT thermal-infrared, near-infrared, and multispectral retrievals, respectively; all in %) are similar to results obtained in MOPITT/NOAA aircraft flask data comparisons from this study and from previous validation efforts. MOPITT CO retrievals are systematically validated using in situ vertical profiles from a variety of aircraft campaigns. Because most aircraft vertical profiles do not sample the troposphere's entire vertical extent, they must be extended upwards in order to be usable in validation. Here we quantify, for the first time, the error introduced in MOPITT CO validation by the use of shorter aircraft vertical profiles extended upwards by analyzing validation results of MOPITT with respect to full and truncated AirCore CO vertical profiles. Our results indicate that the error is small, affects mostly upper tropospheric retrievals (at 300 hPa: <span class="inline-formula">∼</span> 2.6, 0.8, and 3.2 percent points for MOPITT thermal-infrared, near-infrared, and multispectral, respectively), and may have resulted in the overestimation of MOPITT retrieval biases in that region. TROPOMI can retrieve CO under both clear and cloudy conditions. The latter is achieved by quantifying interfering trace gases and parameters describing the cloud contamination of the measurements together with the CO column; then, the reference CO profiles used in the retrieval are scaled based on estimated above-cloud CO rather than on estimated total CO. We use AirCore measurements as the reference to evaluate the error introduced by this approach in cloudy TROPOMI retrievals over land after accounting for TROPOMI's vertical sensitivity to CO (relative bias and its standard deviation <span class="inline-formula">=</span> 2.02 % <span class="inline-formula">±</span> 11.13 %). We also quantify the null-space error, which accounts for differences between the shape of TROPOMI reference profiles and that of AirCore measured profiles (for TROPOMI cloudy <span class="inline-formula"><i>e</i><sub>null</sub>=0.98</span> % <span class="inline-formula">±</span> 2.32 %).</p>https://amt.copernicus.org/articles/15/4751/2022/amt-15-4751-2022.pdf |
| spellingShingle | S. Martínez-Alonso M. N. Deeter B. C. Baier B. C. Baier K. McKain K. McKain H. Worden T. Borsdorff C. Sweeney I. Aben Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles Atmospheric Measurement Techniques |
| title | Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles |
| title_full | Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles |
| title_fullStr | Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles |
| title_full_unstemmed | Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles |
| title_short | Evaluation of MOPITT and TROPOMI carbon monoxide retrievals using AirCore in situ vertical profiles |
| title_sort | evaluation of mopitt and tropomi carbon monoxide retrievals using aircore in situ vertical profiles |
| url | https://amt.copernicus.org/articles/15/4751/2022/amt-15-4751-2022.pdf |
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