TROPESS/CrIS carbon monoxide profile validation with NOAA GML and ATom in situ aircraft observations
<p>The new single-pixel TROPESS (TRopospheric Ozone and its Precursors from Earth System Sounding) profile retrievals of carbon monoxide (CO) from the Cross-track Infrared Sounder (CrIS) are evaluated using vertical profiles of in situ observations from the National Oceanic and Atmospheric Adm...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/15/5383/2022/amt-15-5383-2022.pdf |
| Summary: | <p>The new single-pixel TROPESS (TRopospheric Ozone and its
Precursors from Earth System Sounding) profile retrievals of carbon monoxide
(CO) from the Cross-track Infrared Sounder (CrIS) are evaluated using
vertical profiles of in situ observations from the National Oceanic and
Atmospheric Administration (NOAA) Global Monitoring Laboratory (GML)
aircraft program and from the Atmospheric Tomography Mission (ATom)
campaigns. The TROPESS optimal estimation retrievals are produced using the
MUSES (MUlti-SpEctra, MUlti-SpEcies, MUlti-Sensors) algorithm, which has
heritage from retrieval algorithms developed for the EOS/Aura Tropospheric
Emission Spectrometer (TES). TROPESS products provide retrieval diagnostics
and error covariance matrices that propagate instrument noise as well as the
uncertainties from sequential retrievals of parameters such as temperature
and water vapor that are required to estimate the carbon monoxide profiles.
The validation approach used here evaluates biases in column and profile
values as well as the validity of the retrieval error estimates using the mean and
variance of the compared satellite and aircraft observations. CrIS–NOAA GML
comparisons had biases of 0.6 % for partial column average volume mixing
ratios (VMRs) and (2.3, 0.9, <span class="inline-formula">−4.5</span>) % for VMRs at (750, 511, 287) hPa
vertical levels, respectively, with standard deviations from 9 % to 14 %. CrIS–ATom comparisons had biases of <span class="inline-formula">−0.04</span> % for partial column and
(2.2, 0.5, <span class="inline-formula">−3.0</span>) % for (750, 511, 287) hPa vertical levels, respectively,
with standard deviations from 6 % to 10 %. The reported observational
errors for TROPESS/CrIS CO profiles have the expected behavior with respect
to the vertical pattern in standard deviation of the comparisons. These
comparison results give us confidence in the use of TROPESS/CrIS CO profiles
and error characterization for continuing the multi-decadal record of
satellite CO observations.</p> |
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| ISSN: | 1867-1381 1867-8548 |