edu.ucar.opensky::articles:42539 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:03:16.530859 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d7cf9vfm https://doi.org/10.3334/ORNLDAAC/1925 https Related Dataset #1 ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2 https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L2.003 https Related Dataset #2 TEMPO Formaldehyde total column V03 (BETA) https://doi.org/10.5067/IS-40e/TEMPO/IRR_L1.003 https Related Dataset #3 TEMPO solar irradiance V03 (BETA) Opinion: Beyond global means - novel space-based approaches to indirectly constrain the concentrations of and trends and variations in the tropospheric hydroxyl radical (OH) 2024-11-01T00:00:00Z publication https://n2t.net/ark:/85065/d7cf9vfm https://doi.org/10.5194/acp-24-13001-2024 Duncan, B. N. author Anderson, D. C. author Fiore, A. author Joiner, J. author Krotkov, N. A. author Li, C. author Millet, D. B. author Nicely, J. M. author Oman, L. D. author St. Clair, J. M. author Shutter, J. D. author Souri, A. H. author Strode, S. A. author Weir, B. author Wolfe, G. M. author Worden, Helen M. author Zhu, Q. author UCAR/NCAR - Library publisher The hydroxyl radical (OH) plays a central role in tropospheric chemistry, as well as influencing the lifetimes of some greenhouse gases. Because of limitations in our ability to observe OH, we have historically relied on indirect methods to constrain its concentrations, trends, and variations but only as annual global or annual semi-hemispheric averages. Recent methods demonstrated the feasibility of indirectly constraining tropospheric OH on finer spatio-temporal scales using satellite observations as proxies for the photochemical drivers of OH (e.g., nitrogen dioxide, formaldehyde, isoprene, water vapor, ozone). We found that there are currently reasonable satellite proxies to constrain up to about 75 % of the global sources of tropospheric OH and up to about 50 % of the global sinks. With additional research and investment in observing various volatile organic compounds, there is potential to constrain an additional 10 % of the global sources and 30 % of the global sinks. We propose steps forward for the development of a comprehensive space-based observing strategy, which will improve our ability to indirectly constrain OH on much finer spatio-temporal scales than previously achieved. We discuss the strengths and limitations of such an observing strategy and potential improvements to current satellite instrument observing capabilities that would enable better constraint of OH. Suborbital observations (i.e., data collected from non-satellite platforms such as aircraft, balloons, and buildings) are required to collect information difficult to obtain from space and for validation of satellite-based OH estimates; therefore, they should be an integral part of a comprehensive observing strategy. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span> None eng geoscientificInformation