EGU22-10669, updated on 05 Oct 2023
https://doi.org/10.5194/egusphere-egu22-10669
EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

GEOS-SCREAM: A Stratospheric Composition Reanalysis with Aura MLS

Krzysztof Wargan1,2, Brad Weir1,3, Gloria L. Manney4,5, Stephen E. Cohn1, Katherine Emma Knowland1,3, Pamela A. Wales1,3, and Nathaniel J. Livesey6
Krzysztof Wargan et al.
  • 1Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 2Science Systems and Applications Inc., Lanham, Maryland, USA
  • 3Morgan State University/GESTAR II, Baltimore, Maryland, USA
  • 4NorthWest Research Associates, Socorro, New Mexico, USA
  • 5Department of Physics, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
  • 6Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

The past decade has witnessed a growing interest in the quickly developing field of chemical composition reanalyses, that is, multiyear records of assimilated observations of atmospheric constituent gases. Composition reanalyses typically assimilate observations of atmospheric constituents using full chemistry and transport models driven by assimilated meteorology. Most, although not all, of these reanalyses to date focus on tropospheric composition. This presentation introduces a new chemical reanalysis of stratospheric constituents developed and produced at NASA’s Global Modeling and Assimilation Office (GMAO). Named Global Earth Observing System (GEOS) Stratospheric Composition Reanalysis with Aura MLS (GEOS-SCREAM), this product consists of assimilated global three-dimensional fields of stratospheric ozone, water vapor, hydrogen chloride (HCl), nitric acid (HNO3), and nitrous oxide (N2O) mixing ratios and covers the period since the beginning of MLS observations in September 2004 to 2021. The assimilated instantaneous fields are produced at a three-hourly frequency. GEOS-SCREAM assimilates version 4.2 MLS profiles of the five constituents alongside total ozone column from the Aura Ozone Monitoring Instrument with the recently developed Constituent Data Assimilation System. It is also constrained by tropospheric water vapor from several satellite sensors and in situ measurements with the existing MERRA-2 meteorological data assimilation system. GEOS-SCREAM provides an accurate and dynamically consistent high-resolution data record of the five constituents, all of which are of primary importance to stratospheric chemistry and transport studies. We will present a description of GEOS-SCREAM and selected results of a process-based evaluation of this product using independent data. We will also discuss potential scientific applications of GEOS-SCREAM and outline plans for an upcoming comprehensive composition reanalysis that is being developed at NASA GMAO.

How to cite: Wargan, K., Weir, B., Manney, G. L., Cohn, S. E., Knowland, K. E., Wales, P. A., and Livesey, N. J.: GEOS-SCREAM: A Stratospheric Composition Reanalysis with Aura MLS, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-10669, https://doi.org/10.5194/egusphere-egu22-10669, 2022.