Journal Article Ppublish 24 citations
PubMed: 35860786 DOI: 10.1029/2020GL091520
Evaluating Drought Responses of Surface Ozone Precursor Proxies: Variations With Land Cover Type, Precipitation, and Temperature.
Geophys Res Lett 48(7):e2020GL091520
Authors: Jacob G Naimark, Arlene M Fiore, Xiaomeng Jin, Yuxuan Wang, Elizabeth Klovenski, Christian Braneon
Affiliations
- Department of Earth and Environmental Sciences, Columbia College Columbia University New York NY USA. Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory Columbia University Palisades NY USA.
- Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory Columbia University Palisades NY USA.
- Department of Chemistry University of California Berkeley Berkeley NY USA.
- Department of Earth and Atmospheric Sciences University of Houston Houston TX USA.
- NASA Goddard Institute for Space Studies (GISS) New York NY USA.
- SciSpace LLC Bethesda MD USA.
Abstract
Prior work suggests drought exacerbates US air quality by increasing surface ozone concentrations. We analyze 2005-2015 tropospheric column concentrations of two trace gases that serve as proxies for surface ozone precursors retrieved from the OMI/Aura satellite: Nitrogen dioxide (ΩNO NO proxy) and formaldehyde (ΩHCHO; VOC proxy). We find 3.5% and 7.7% summer drought enhancements (classified by SPEI) for ΩNO and ΩHCHO, respectively, corroborating signals previously extracted from ground-level observations. When we subset by land cover type, the strongest ΩHCHO drought enhancement (10%) occurs in the woody savannas of the Southeast US. By isolating the influences of precipitation and temperature, we infer that enhanced biogenic VOC emissions in this region increase ΩHCHO independently with both high temperature and low precipitation during drought. The strongest ΩNO drought enhancement (6.0%) occurs over Midwest US croplands and grasslands, which we infer to reflect the sensitivity of soil NO emissions to temperature.
MeSH
Temperature, Droughts, Grassland