An observation-based, reduced-form model for oxidation in the remote marine troposphere.

Autor: Baublitz CB; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027.; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964., Fiore AM; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027.; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964., Ludwig SM; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027.; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964., Nicely JM; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740.; Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771., Wolfe GM; Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771., Murray LT; Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627., Commane R; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027.; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964., Prather MJ; Department of Earth System Science, University of California, Irvine, CA 92697., Anderson DC; Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771.; Goddard Earth Sciences Technology and Research II, University of Maryland Baltimore County, Baltimore, MD 21250., Correa G; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964., Duncan BN; Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771., Follette-Cook M; Atmospheric Chemistry and Dynamics Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771.; Goddard Earth Sciences Technology and Research II, Morgan State University, Baltimore, MD 21251., Westervelt DM; Division of Ocean and Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964.; National Aeronautics and Space Administration Goddard Institute for Space Studies, New York, NY 10025., Bourgeois I; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309.; National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO 80305., Brune WH; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA 16802., Bui TP; Atmospheric Science Branch, National Aeronautics and Space Administration Ames Research Center, Moffett Field, CA 94035., DiGangi JP; National Aeronautics and Space Administration Langley Research Center, Hampton, VA 23666., Diskin GS; National Aeronautics and Space Administration Langley Research Center, Hampton, VA 23666., Hall SR; Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307., McKain K; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309.; National Oceanic and Atmospheric Administration Global Monitoring Laboratory, Boulder, CO 80305., Miller DO; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA 16802., Peischl J; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309.; National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO 80305., Thames AB; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA 16802., Thompson CR; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309.; National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO 80305., Ullmann K; Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307., Wofsy SC; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138.
Jazyk: angličtina
Zdroj: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2023 Aug 22; Vol. 120 (34), pp. e2209735120. Date of Electronic Publication: 2023 Aug 14.
DOI: 10.1073/pnas.2209735120
Abstrakt: The hydroxyl radical (OH) fuels atmospheric chemical cycling as the main sink for methane and a driver of the formation and loss of many air pollutants, but direct OH observations are sparse. We develop and evaluate an observation-based proxy for short-term, spatial variations in OH (Proxy OH ) in the remote marine troposphere using comprehensive measurements from the NASA Atmospheric Tomography (ATom) airborne campaign. Proxy OH is a reduced form of the OH steady-state equation representing the dominant OH production and loss pathways in the remote marine troposphere, according to box model simulations of OH constrained with ATom observations. Proxy OH comprises only eight variables that are generally observed by routine ground- or satellite-based instruments. Proxy OH scales linearly with in situ [OH] spatial variations along the ATom flight tracks (median r 2 = 0.90, interquartile range = 0.80 to 0.94 across 2-km altitude by 20° latitudinal regions). We deconstruct spatial variations in Proxy OH as a first-order approximation of the sensitivity of OH variations to individual terms. Two terms modulate within-region Proxy OH variations-water vapor (H 2 O) and, to a lesser extent, nitric oxide (NO). This implies that a limited set of observations could offer an avenue for observation-based mapping of OH spatial variations over much of the remote marine troposphere. Both H 2 O and NO are expected to change with climate, while NO also varies strongly with human activities. We also illustrate the utility of Proxy OH as a process-based approach for evaluating intermodel differences in remote marine tropospheric OH.
Databáze: MEDLINE