Dynamical Mechanism for the Increase in Tropical Upwelling in the Lowermost Tropical Stratosphere during Warm ENSO Events

Calvo, Natalia; Garcia, R. R.; Randel, W. J.; Marsh, D. R.

doi:10.1175/2010jas3433.1

Dynamical Mechanism for the Increase in Tropical Upwelling in the Lowermost Tropical Stratosphere during Warm ENSO Events

Journal Article · Thu Jul 01 00:00:00 EDT 2010 · Journal of the Atmospheric Sciences

DOI:https://doi.org/10.1175/2010jas3433.1· OSTI ID:1564724

Calvo, Natalia ^[1]; Garcia, R. R. ^[2]; Randel, W. J. ^[2]; Marsh, D. R. ^[2]

National Center for Atmospheric Research, Boulder, CO (United States); Univ. Complutense Madrid (Spain)
National Center for Atmospheric Research, Boulder, CO (United States)

The Brewer–Dobson circulation strengthens in the lowermost tropical stratosphere during warm El Niño–Southern Oscillation (ENSO) events. Dynamical analyses reflecting the most recent version of the Whole Atmosphere Community Climate Model show that this is due mainly to anomalous forcing by orographic gravity waves, which maximizes in the Northern Hemisphere subtropics between 18 and 22 km, especially during the strongest warm ENSO episodes. Anomalies in the meridional gradient of temperature in the upper troposphere and lower stratosphere (UTLS) are produced during warm ENSO events, accompanied by anomalies in the location and intensity of the subtropical jets. This anomalous wind pattern changes the propagation and dissipation of the parameterized gravity waves, which ultimately force increases in tropical upwelling in the lowermost stratosphere. During cold ENSO events a similar signal, but of opposite sign, is present in the model simulations. The signals in ozone and water vapor produced by ENSO events in the UTLS are also investigated.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564724

Journal Information:: Journal of the Atmospheric Sciences, Journal Name: Journal of the Atmospheric Sciences Journal Issue: 7 Vol. 67; ISSN 0022-4928

Publisher:: American Meteorological SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Dynamical Mechanism for the Increase in Tropical Upwelling in the Lowermost Tropical Stratosphere during Warm ENSO Events

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