Spinei, E.Cede, A.Swartz, W. H.Herman, JayMount, G. H.2023-02-132023-02-132014-12-09Spinei, E., et al. "The use of NO₂ absorption cross section temperature sensitivity to derive NO₂ profile temperature and stratospheric–tropospheric column partitioning from visible direct-sun DOAS measurements" Atmos. Meas. Tech 7 (09 Dec 2014): 4299–4316. https://doi.org/10.5194/amt-7-4299-2014.https://doi.org/10.5194/amt-7-4299-2014http://hdl.handle.net/11603/26807This paper presents a temperature sensitivity method (TESEM) to accurately calculate total vertical NO₂ column, atmospheric slant NO₂ profile-weighted temperature (T ), and to separate stratospheric and tropospheric columns from direct-sun (DS), ground-based measurements using the retrieved T . TESEM is based on differential optical absorption spectroscopy (DOAS) fitting of the linear temperature-dependent NO₂ absorption cross section, σ (T ), regression model (Vandaele et al., 2003). Separation between stratospheric and tropospheric columns is based on the primarily bimodal vertical distribution of NO₂ and an assumption that stratospheric effective temperature can be represented by temperature at 27 km ± 3 K, and tropospheric effective temperature is equal to surface temperature within 3–5 K. These assumptions were derived from the Global Modeling Initiative (GMI) chemistry-transport model (CTM) simulations over two northern midlatitude sites in 2011. TESEM was applied to the Washington State University Multi-Function DOAS instrument (MFDOAS) measurements at four midlatitude locations with low and moderate NO₂ anthropogenic emissions: (1) the Jet Propulsion Laboratory’s Table Mountain Facility (JPLTMF), CA, USA (34.38◦ N/117.68◦ W); (2) Pullman, WA, USA (46.73◦ N/117.17◦ W); (3) Greenbelt, MD, USA (38.99◦ N/76.84◦ W); and (4) Cabauw, the Netherlands (51.97◦ N/4.93◦ E) during July 2007, June–July 2009, July– August and October 2011, November 2012–May 2013, respectively. NO₂ T and total, stratospheric, and tropospheric NO₂ vertical columns were determined over each site18 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Attribution 3.0 Unported (CC BY 3.0)https://creativecommons.org/licenses/by/3.0/Text