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Precipitation variability over the South Asian monsoon heat flow and associated teleconnections

MPS-Authors
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Saeed,  S.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Mueller,  W. A.
The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Hagemann,  S.
The Land in the Earth System, MPI for Meteorology, Max Planck Society;
Terrestrial Hydrology, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Jacob,  D.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Saeed, S., Mueller, W. A., Hagemann, S., Jacob, D., Mujumdar, M., & Krishnan, R. (2011). Precipitation variability over the South Asian monsoon heat flow and associated teleconnections. Geophysical Research Letters, 38: L08702. doi:10.1029/2011GL046984.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-F4FC-1
Abstract
The present study examines the precipitation variability over the South Asian monsoon heat low region and associated teleconnections using high resolution (T106L31) climate simulations performed with the ECHAM5 model. It is found that an intensification of the heat low in response to enhanced precipitation/convection over northwestern India-Pakistan (NWIP) can induce large-scale circulation anomalies that resemble the northern summer circumglobal teleconnection (CGT) wave-like pattern extending well into the Asian monsoon region. Accordingly the wave-like response to rainfall increase over the heat low region is associated with anomalous ascent over northern China and descent over the South China Sea. Additionally, small but statistically significant lead-lag correlations between the heat low and precipitation over northern China further suggest that the detected signal pertains to the true features of the process. On the other hand, suppressed convection and rainfall over the heat low region do not reveal any significant large-scale circulation anomalies. Copyright 2011 by the American Geophysical Union.