Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals
The Cross-track Infrared Sounder (CrIS), in low Earth orbit since 2011, makes measurements of the top of atmosphere radiance for input into data assimilation (DA) systems as well as the retrieval of geophysical state variables. CrIS measurements have 2211 narrow infrared channels ranging between 650...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/3/547 |
| _version_ | 1797623387156119552 |
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| author | Chris D. Barnet Nadia Smith Kayo Ide Kevin Garrett Erin Jones |
| author_facet | Chris D. Barnet Nadia Smith Kayo Ide Kevin Garrett Erin Jones |
| author_sort | Chris D. Barnet |
| collection | DOAJ |
| description | The Cross-track Infrared Sounder (CrIS), in low Earth orbit since 2011, makes measurements of the top of atmosphere radiance for input into data assimilation (DA) systems as well as the retrieval of geophysical state variables. CrIS measurements have 2211 narrow infrared channels ranging between 650 and 2550 cm<sup>−1</sup> (~3.9–15.4 μm) and capture the variation in profiles of atmospheric temperature, water vapor, and numerous trace gas species. DA systems derive atmospheric temperature by assimilating CO<sub>2</sub>-sensitive channels in the CrIS longwave (LW) band (650–1095 cm<sup>−1</sup>). Here, we investigate if CO<sub>2</sub>-sensitive channels in the shortwave (SW) band (2155–2550 cm<sup>−1</sup>) can similarly be applied. We first evaluated the information content of the CrIS bands followed by an assessment of the performance degradation of retrievals due to the loss of individual CrIS bands. We found that temperature profile retrievals derived from the CrIS SW band were statistically both well-behaved and as accurate as a retrieval utilizing the CrIS LW band. The one caveat, however, is that the higher CrIS instrument noise in the SW band limited its performance under certain conditions. We conclude with a discussion on the implications our results have for channel selection in retrieval and DA systems as well as the design of future space instruments. |
| first_indexed | 2024-03-11T09:28:12Z |
| format | Article |
| id | doaj.art-3e286ddf8d534d26a452666d5e246311 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T09:28:12Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-3e286ddf8d534d26a452666d5e2463112023-11-16T17:50:45ZengMDPI AGRemote Sensing2072-42922023-01-0115354710.3390/rs15030547Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding RetrievalsChris D. Barnet0Nadia Smith1Kayo Ide2Kevin Garrett3Erin Jones4Science and Technology Corporation, Columbia, MD 21046, USAScience and Technology Corporation, Columbia, MD 21046, USACooperative Institute for Satellite Earth System Studies, University of Maryland, College Park, MD 20742, USANOAA/NESDIS/STAR, College Park, MD 20740, USACooperative Institute for Satellite Earth System Studies, University of Maryland, College Park, MD 20742, USAThe Cross-track Infrared Sounder (CrIS), in low Earth orbit since 2011, makes measurements of the top of atmosphere radiance for input into data assimilation (DA) systems as well as the retrieval of geophysical state variables. CrIS measurements have 2211 narrow infrared channels ranging between 650 and 2550 cm<sup>−1</sup> (~3.9–15.4 μm) and capture the variation in profiles of atmospheric temperature, water vapor, and numerous trace gas species. DA systems derive atmospheric temperature by assimilating CO<sub>2</sub>-sensitive channels in the CrIS longwave (LW) band (650–1095 cm<sup>−1</sup>). Here, we investigate if CO<sub>2</sub>-sensitive channels in the shortwave (SW) band (2155–2550 cm<sup>−1</sup>) can similarly be applied. We first evaluated the information content of the CrIS bands followed by an assessment of the performance degradation of retrievals due to the loss of individual CrIS bands. We found that temperature profile retrievals derived from the CrIS SW band were statistically both well-behaved and as accurate as a retrieval utilizing the CrIS LW band. The one caveat, however, is that the higher CrIS instrument noise in the SW band limited its performance under certain conditions. We conclude with a discussion on the implications our results have for channel selection in retrieval and DA systems as well as the design of future space instruments.https://www.mdpi.com/2072-4292/15/3/547hyperspectralinfraredBayesian inversioninformation contentsignal-to-noise |
| spellingShingle | Chris D. Barnet Nadia Smith Kayo Ide Kevin Garrett Erin Jones Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals Remote Sensing hyperspectral infrared Bayesian inversion information content signal-to-noise |
| title | Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals |
| title_full | Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals |
| title_fullStr | Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals |
| title_full_unstemmed | Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals |
| title_short | Evaluating the Value of CrIS Shortwave-Infrared Channels in Atmospheric-Sounding Retrievals |
| title_sort | evaluating the value of cris shortwave infrared channels in atmospheric sounding retrievals |
| topic | hyperspectral infrared Bayesian inversion information content signal-to-noise |
| url | https://www.mdpi.com/2072-4292/15/3/547 |
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