Trends and Interannual Variability of the Hydroxyl Radical in the Remote Tropics During Boreal Autumn Inferred From Satellite Proxy Data

Author:

Anderson Daniel C.12ORCID,Duncan Bryan N.2ORCID,Liu Junhua23ORCID,Nicely Julie M.24ORCID,Strode Sarah A.23ORCID,Follette‐Cook Melanie B.5,Souri Amir H.23ORCID,Ziemke Jerry R.23ORCID,González‐Abad Gonzalo6ORCID,Ayazpour Zolal67ORCID

Affiliation:

1. GESTAR II University of Maryland Baltimore County Baltimore MD USA

2. Atmospheric Chemistry and Dynamics Laboratory NASA Goddard Space Flight Center Greenbelt MD USA

3. GESTAR II Morgan State University Baltimore MD USA

4. Earth System Science Interdisciplinary Center University of Maryland College Park College Park MD USA

5. Mesoscale Atmospheric Processes Laboratory NASA Goddard Space Flight Center Greenbelt MD USA

6. Harvard‐Smithsonian Center for Astrophysics Cambridge MA USA

7. Department of Civil, Structural, and Environmental Engineering University at Buffalo Buffalo NY USA

Abstract

AbstractDespite its importance for the global oxidative capacity, spatially resolved trends and variability of the hydroxyl radical (OH) are poorly constrained. We demonstrate the utility of a tropospheric column OH (TCOH) product, created from machine learning and satellite proxy data, in determining the spatial variability in trends of tropical OH over the oceans during September through November. While OH increases domain‐wide by 2.1%/decade from 2005–2019, we find significant spatial heterogeneity in regional trends, with decreases in some areas of 2.5%/decade. Our analysis of the trends in the proxy data indicate anthropogenic‐driven changes in emissions of OH drivers as well as increasing temperatures cause these trends. This OH product is potentially a significant advance in constraining OH spatial variability and serves as a useful complement to existing tools in understanding the atmospheric oxidative capacity. Comprehensive observations of TCOH are required to assess the fidelity of this method.

Funder

National Aeronautics and Space Administration

Publisher

American Geophysical Union (AGU)

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