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The Response of Tropospheric Ozone to ENSO in Observations and a Chemistry-Climate SimulationThe El Nino-Southern Oscillation (ENSO) is the dominant mode of tropical variability on interannual time scales. ENSO appears to extend its influence into the chemical composition of the tropical troposphere. Recent results have revealed an ENSO induced wave-l anomaly in observed tropical tropospheric column ozone. This results in a dipole over the western and eastern tropical Pacific, whereby differencing the two regions produces an ozone anomaly with an extremely high correlation to the Nino 3.4 Index. We have successfully reproduced this result using the Goddard Earth Observing System Version 5 (GEOS-5) general circulation model coupled to a comprehensive stratospheric and tropospheric chemical mechanism forced with observed sea surface temperatures over the past 25 years. An examination of the modeled ozone field reveals the vertical contributions of tropospheric ozone to the column over the western and eastern Pacific region. We will show targeted comparisons with observations from NASA's Aura satellite Microwave Limb Sounder (MLS), and the Tropospheric Emissions Spectrometer (TES) to provide insight into the vertical structure of ozone changes. The tropospheric ozone response to ENSO could be a useful chemistry-climate model evaluation tool and should be considered in future modeling assessments.
Document ID
20120009842
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Oman, L. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Douglass, A. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ziemke, J. R. (Morgan State Univ. Baltimore, MD, United States)
Waugh, D. W. (Johns Hopkins Univ. Baltimore, MD, United States)
Rodriguez, J. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nielsen, J. E. (Science Systems and Applications, Inc. Lanham, MD, United States)
Date Acquired
August 25, 2013
Publication Date
May 19, 2012
Subject Category
Meteorology And Climatology
Report/Patent Number
GSFC.ABS.00234.2012
Meeting Information
Meeting: International Global Atmospheric Chemistry (IGAC)/Stratospheric Processes and their Role in Climate (SPARC) Global Chemistry Modeling and Evaluation Workshop
Location: Davos
Country: Switzerland
Start Date: May 19, 2012
End Date: May 25, 2012
Sponsors: International Global Atmospheric Chemistry
Distribution Limits
Public
Copyright
Public Use Permitted.

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