Global Formaldehyde Products From the Ozone Mapping and Profiler Suite (OMPS) Nadir Mappers on Suomi NPP and NOAA‐20

Author:

Nowlan Caroline R.1ORCID,González Abad Gonzalo1ORCID,Kwon Hyeong‐Ahn12ORCID,Ayazpour Zolal3ORCID,Chan Miller Christopher14,Chance Kelly1ORCID,Chong Heesung1ORCID,Liu Xiong1ORCID,O’Sullivan Ewan1ORCID,Wang Huiqun1ORCID,Zhu Lei5ORCID,De Smedt Isabelle6ORCID,Jaross Glen7,Seftor Colin78ORCID,Sun Kang3ORCID

Affiliation:

1. Center for Astrophysics Harvard & Smithsonian Cambridge MA USA

2. Now at the University of Suwon Gyeonggi‐do Republic of Korea

3. University at Buffalo NY Buffalo USA

4. Harvard University MA Cambridge USA

5. Southern University of Science and Technology Shenzhen China

6. Royal Belgian Institute for Space Aeronomy Brussels Belgium

7. NASA Goddard Space Flight Center MD Greenbelt USA

8. Science Systems and Applications, Inc MD Lanham USA

Abstract

AbstractWe describe new publicly available, multi‐year formaldehyde (HCHO) data records from the Ozone Mapping and Profiler Suite (OMPS) nadir mapper (NM) instruments on the Suomi NPP and NOAA‐20 satellites. The OMPS‐NM instruments measure backscattered UV light over the globe once per day, with spatial resolutions close to nadir of 50 × 50 km2 (OMPS/Suomi‐NPP) and 17 × 17 km2 or 12 × 17 km2 (OMPS/NOAA‐20). After a preliminary instrument line shape and wavelength calibration using on‐orbit observations, we use the backscatter measurements in a direct spectral fit of radiances, in combination with a nadir reference spectrum collected over a clean area, to determine slant columns of HCHO. The slant columns are converted to vertical columns using air mass factors (AMFs) derived through scene‐by‐scene radiative transfer calculations. Finally, a correction is applied to account for background HCHO in the reference spectrum, as well as any remaining high‐latitude biases. We investigate the consistency of the OMPS products from Suomi NPP and NOAA‐20 using long‐term monthly means over 12 geographic regions, and also compare the products with publicly available TROPOMI HCHO observations. OMPS/Suomi‐NPP and OMPS/NOAA‐20 monthly mean HCHO vertical columns are highly consistent (r = 0.98), with low proportional (2%) and offset (2 × 1014 molecules cm−2) biases. OMPS HCHO monthly means are also well‐correlated with those from TROPOMI (r = 0.92), although they are consistently 10% ± 16% larger in polluted regions (columns >8 × 1015 molecules cm−2). These differences result primarily from differences in AMFs.

Funder

Climate Program Office

Science Mission Directorate

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Environmental Science (miscellaneous)

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