Trends in Upper Tropospheric Tropical Ozone and Carbon Monoxide: Microwave Limb Sounder and Model Results
Abstract
We analyze ozone and carbon monoxide variations in the tropical upper troposphere (UT), based on continuous measurements (2005 to 2018) by the Microwave Limb Sounder (MLS) aboard the Aura satellite. We compare spatio-temporal variations and trends in tropical UT ozone from MLS to model results from the Community Earth System Model version 2 (CESM2) Whole Atmosphere Community Climate Model (WACCM). We apply multiple linear regression to zonal mean and gridded (latitude/longitude) time series of observed and modeled ozone and carbon monoxide abundances, and discuss the resulting trends. The MLS data show that tropical UT ozone has generally increased since 2005, while carbon monoxide in this region has decreased. We also evaluate the importance of different factors contributing to the variability, based on the fitted regression terms. The main model/data differences resulting from these analyses are discussed.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.A44F..02F
- Keywords:
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- 0340 Middle atmosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0341 Middle atmosphere: constituent transport and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0342 Middle atmosphere: energy deposition;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0394 Instruments and techniques;
- ATMOSPHERIC COMPOSITION AND STRUCTURE