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Climate Dynamics

, Volume 31, Issue 2–3, pp 213–226 | Cite as

Tropical Pacific impacts of convective momentum transport in the SNU coupled GCM

  • Daehyun Kim
  • Jong-Seong Kug
  • In-Sik Kang
  • Fei-Fei Jin
  • Andrew T. Wittenberg
Article

Abstract

Impacts of convective momentum transport (CMT) on tropical Pacific climate are examined, using an atmospheric (AGCM) and coupled GCM (CGCM) from Seoul National University. The CMT scheme affects the surface mainly via a convection-compensating atmospheric subsidence which conveys momentum downward through most of the troposphere. AGCM simulations—with SSTs prescribed from climatological and El Nino Southern Oscillation (ENSO) conditions—show substantial changes in circulation when CMT is added, such as an eastward shift of the climatological trade winds and west Pacific convection. The CMT also alters the ENSO wind anomalies by shifting them eastward and widening them meridionally, despite only subtle changes in the precipitation anomaly patterns. During ENSO, CMT affects the low-level winds mainly via the anomalous convection acting on the climatological westerly wind shear over the central Pacific—so that an eastward shift of convection transfers more westerly momentum toward the surface than would occur without CMT. By altering the low-level circulation, the CMT further alters the precipitation, which in turn feeds back on the CMT. In the CGCM, CMT affects the simulated climatology by shifting the mean convection and trade winds eastward and warming the equatorial SST; the ENSO period and amplitude also increase. In contrast to the AGCM simulations, CMT substantially alters the El Nino precipitation anomaly patterns in the CGCM. Also discussed are possible impacts of the CMT-induced changes in climatology on the simulated ENSO.

Keywords

Wind Stress Zonal Wind Wind Shear Vertical Wind Shear Pressure Gradient Force 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The work was supported by the SRC program of Korea Science and Engineering Foundation, and Brain Korea 21 Project. I.-S. Kang was supported by Ministry of Environment as “The Ecotechnopia 21 project”. F.-F. Jin was partly supported by NSF grants ATM-0652145 and ATM-0650552 and NOAA grants GC01-229.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Daehyun Kim
    • 1
  • Jong-Seong Kug
    • 2
  • In-Sik Kang
    • 1
    • 2
  • Fei-Fei Jin
    • 3
  • Andrew T. Wittenberg
    • 4
  1. 1.School of Earth and Environmental SciencesSeoul National UniversitySeoulSouth Korea
  2. 2.Climate Environmental System Research CenterSeoul National UniversitySeoulSouth Korea
  3. 3.Department of Meteorology, SOESTUniversity of HawaiiHonoluluUSA
  4. 4.Geophysical Fluid Dynamics LaboratoryNOAAPrincetonUSA

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