Preprints
https://doi.org/10.5194/amt-2021-159
https://doi.org/10.5194/amt-2021-159

  22 Jun 2021

22 Jun 2021

Review status: this preprint is currently under review for the journal AMT.

A Global Ozone Profile Climatology for Satellite Retrieval Algorithms Based on Aura MLS Measurements and the MERRA-2 GMI Simulation

Jerald R. Ziemke1,2, Gordon J. Labow3, Natalya A. Kramarova1, Richard D. McPeters1, Pawan K. Bhartia1, Luke D. Oman1, Stacey M. Frith3, and David P. Haffner3 Jerald R. Ziemke et al.
  • 1NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 2Morgan State University, Baltimore, Maryland, USA
  • 3SSAI, Lanham, Maryland, USA

Abstract. A new atmospheric ozone profile climatology has been constructed by combining ozone profiles from the Aura Microwave Limb Sounder (MLS) and Modern‐Era Retrospective Analysis for Research Applications version 2 (MERRA2) Global Modeling Initiative (GMI) model simulation (M2GMI). The MLS and M2GMI ozone profiles are merged between 13 and 17 km (~159 and 88 hPa) with MLS used for stratospheric and GMI for primarily tropospheric levels. The time record for profiles from MLS and GMI is August 2004–December 2016. The derived seasonal climatology consists of monthly zonal-mean ozone profiles in 5-degree latitude bands from 90° S–90° N covering altitudes (in Z* log-pressure altitude) from zero to 80 km in 1 km increments. This climatology can be used as a priori information in satellite ozone retrievals, in atmospheric radiative transfer studies, and as a baseline to compare with other measured or model-simulated ozone. The MLS/GMI seasonal climatology shows a number of improvements compared to previous ozone profile climatologies based on MLS and ozonesonde measurements. These improvements are attributed mostly to continuous daily global coverage of GMI tropospheric ozone compared to sparse regional measurements from sondes. Only daytime measurements for MLS are used in the MLS/GMI climatology compared to the previous MLS/sonde climatology that averaged MLS day and night measurements together; the daytime-only measurements are important for applications involving the upper stratosphere and lower mesosphere where the ozone diurnal cycle is large. In addition to the seasonal climatology, we also derive an additive climatology to account for inter-annual variability in stratospheric zonal-mean ozone profiles which is based on a rotated empirical orthogonal function (REOF) analysis of Aura MLS ozone profiles. This REOF climatology starts in 1970 and captures most of the inter-annual variability in global stratospheric ozone including Quasi-Biennial Oscillation (QBO) signatures.

Jerald R. Ziemke et al.

Status: open (until 17 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-159', Anonymous Referee #1, 19 Jul 2021 reply
  • RC2: 'Review of the manuscript “A Global Ozone Profile Climatology for Satellite Retrieval Algorithms Based on Aura MLS Measurements and the MERRA-2 GMI Simulation“ by J.R. Ziemke', Anonymous Referee #2, 20 Jul 2021 reply

Jerald R. Ziemke et al.

Jerald R. Ziemke et al.

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Short summary
Seasonal and inter-annual ozone profile climatologies are produced from combined MLS and MERRA2 GMI ozone for the general public. Both climatologies extend from pole-to-pole at altitudes 0–80 km (1 km spacing) for time record 1970–2018. These climatologies are important for use as a priori in satellite ozone retrieval algorithms, as validation of other measured and model simulated ozone, and in radiative transfer studies of the atmosphere.