Editorial Type:
Article
Article Type:
Research Article

Role of the Indian Ocean in the ENSO–Indian Summer Monsoon Teleconnection in the NCEP Climate Forecast System

Deepthi Achuthavarier Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, Virginia

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V. Krishnamurthy Center for Ocean–Land–Atmosphere Studies, Institute of Global Environment and Society, Calverton, Maryland, and Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, Virginia

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Ben P. Kirtman Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida

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Bohua Huang Department of Atmospheric, Oceanic and Earth Sciences, George Mason University, Fairfax, Virginia, and Center for Ocean–Land–Atmosphere Studies, Institute of Global Environment and Society, Calverton, Maryland

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Print Publication:
01 Apr 2012
DOI:
https://doi.org/10.1175/JCLI-D-11-00111.1
Page(s):
2490–2508
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Abstract

The observed negative correlation between El Niño–Southern Oscillation (ENSO) and the Indian summer monsoon is not simulated by the National Centers for Environmental Prediction (NCEP) Climate Forecast System (CFS) coupled model. The correlation is partially restored in the simulations where the Indian Ocean (IO) sea surface temperature (SST) is prescribed with the daily mean or climatology. Comparison among the simulations suggests that ENSO-induced SST anomalies form a strong dipole pattern oriented along the zonal direction in the IO in the coupled model, preventing the ENSO signals from reaching the Indian monsoon region. In the model, the dipole develops early in the monsoon season and extends to the central equatorial IO while it is formed at the end of the season in observations. The dipole modifies low-level winds and surface pressure, and grows in a positive feedback loop involving winds, surface pressure, and SST. Examination of the mean state in the model reveals that the thermocline is relatively shallow in the eastern IO. This preconditions the ocean such that the atmospheric fluxes can easily impart fluctuations in the subsurface temperature and thereby in the SST. These results suggest that biases in the IO can adversely affect the ENSO–monsoon teleconnection in a coupled model.

Current affiliation: Universities Space Research Association, Columbia, Maryland.

Corresponding author address: Deepthi Achuthavarier, Goddard Earth Sciences Technology and Research, B33 C118, NASA GSFC, Greenbelt, MD 20771. E-mail: dvarrier@yahoo.com

Abstract

The observed negative correlation between El Niño–Southern Oscillation (ENSO) and the Indian summer monsoon is not simulated by the National Centers for Environmental Prediction (NCEP) Climate Forecast System (CFS) coupled model. The correlation is partially restored in the simulations where the Indian Ocean (IO) sea surface temperature (SST) is prescribed with the daily mean or climatology. Comparison among the simulations suggests that ENSO-induced SST anomalies form a strong dipole pattern oriented along the zonal direction in the IO in the coupled model, preventing the ENSO signals from reaching the Indian monsoon region. In the model, the dipole develops early in the monsoon season and extends to the central equatorial IO while it is formed at the end of the season in observations. The dipole modifies low-level winds and surface pressure, and grows in a positive feedback loop involving winds, surface pressure, and SST. Examination of the mean state in the model reveals that the thermocline is relatively shallow in the eastern IO. This preconditions the ocean such that the atmospheric fluxes can easily impart fluctuations in the subsurface temperature and thereby in the SST. These results suggest that biases in the IO can adversely affect the ENSO–monsoon teleconnection in a coupled model.

Current affiliation: Universities Space Research Association, Columbia, Maryland.

Corresponding author address: Deepthi Achuthavarier, Goddard Earth Sciences Technology and Research, B33 C118, NASA GSFC, Greenbelt, MD 20771. E-mail: dvarrier@yahoo.com
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