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

Saeed, S and Muller, WA and Hagemann, S and Jacob, D and Mujumdar, M and Krishnan, R (2011) Precipitation variability over the South Asian monsoon heat low and associated teleconnections. Geophysical Research Letters, 38 (8).

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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.

Item Type: Article
Additional Information: Copyrights of this article belongs to American Geophysical Union
Uncontrolled Keywords: Asian monsoon; Climate simulation; Heat low; High resolution; Large-scale circulation; Lead-lag; Northern China; Pakistan; Precipitation variability; South China Sea; Teleconnections, Climate models; Computer simulation; Rain, Atmospheric thermodynamics, air temperature; atmospheric circulation; atmospheric convection; climate modeling; monsoon; precipitation assessment; teleconnection; temperature anomaly; temperature profile, South Asia
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 12 Aug 2014 05:19
Last Modified: 12 Aug 2014 05:19

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