Updated OMI Glyoxal Column Measurements Using Collection 4 Level 1B Radiances

Author:

Kwon Hyeong‐Ahn1ORCID,González Abad Gonzalo2ORCID,Chan Miller Christopher234,Hall Kirsten R.2ORCID,Nowlan Caroline R.2ORCID,O’Sullivan Ewan2ORCID,Wang Huiqun2ORCID,Chong Heesung2,Ayazpour Zolal25ORCID,Liu Xiong2ORCID,Chance Kelly2ORCID

Affiliation:

1. University of Suwon Hwaseong‐si Republic of Korea

2. Center for Astrophysics | Harvard & Smithsonian Cambridge MA USA

3. Harvard University Cambridge MA USA

4. Environmental Defense Fund New York NY USA

5. University at Buffalo Buffalo NY USA

Abstract

AbstractThis study presents new glyoxal (CHOCHO) products from the Ozone Monitoring Instrument (OMI) by utilizing updated level 1B irradiance/radiance data (Collection 4) and an updated glyoxal retrieval algorithm. The adoption of Collection 4 contributes to the reduction of artificial signals in differential glyoxal slant column densities (dSCDs) and improved fitting root mean square, and the updated retrieval settings result in fewer negative values of glyoxal dSCDs over oceans and less noisy dSCDs in the South Atlantic Anomaly. On‐line calculations of air mass factors consider interactive physical processes between input parameters. To address persistent trends in glyoxal SCDs over the Pacific Ocean that remain despite these updates, a trend correction is implemented. We evaluate the updated OMI glyoxal products using inter‐comparisons with GOME‐2A/2B glyoxal products. OMI glyoxal products exhibit good spatial and temporal agreement with GOME‐2A/2B, with correlation coefficients of 0.75–0.78 globally and 0.84–0.85 over source regions. Small biases are observed in OMI glyoxal vertical column densities, ranging from −0.2 ± 5.7% to 9 ± 3% in low and high glyoxal conditions, respectively, against GOME‐2A/2B. These advancements contribute to the reliability and accuracy of OMI glyoxal products, enhancing their utility for atmospheric studies and enabling a 20‐year‐long data record suitable for climate studies.

Publisher

American Geophysical Union (AGU)

Reference79 articles.

1. AC SAF/DLR. (2021).GOME‐2 glyoxal (CHOCHO) column data record – Metop[Dataset].EUMETSAT SAF on Atmospheric Composition Monitoring.https://doi.org/10.15770/EUM_SAF_O3M_0016

2. AVDC. (2016).OMI glyoxal products using Collection 3 (OMCHOCHO)[Dataset].The Aura Validation Data Center (AVDC).https://avdc.gsfc.nasa.gov/pub/data/satellite/Aura/OMI/V03/L2/OMCHOCHO/

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