Journal
ENVIRONMENTAL RESEARCH LETTERS
Volume 10, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1748-9326/10/5/054008
Keywords
Monsoon; river runoff; ocean salinty; coupled model; El Nino
Funding
- Indian Ocean Modeling (INDOMOD) programme of Indian National Centre for Ocean Information Services (INCOIS)
- CTCZ program - Ministry of Earth Sci., Govt. of India
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Rivers of the world discharge about 36000 km 3 of freshwater into the ocean every year. To investigate the impact of river discharge on climate, we have carried out two 100 year simulations using the Community Climate System Model (CCSM3), one including the river runoff into the ocean and the other excluding it. When the river discharge is shut off, global average sea surface temperature (SST) rises by about 0.5 degrees C and the Indian Summer Monsoon Rainfall (ISMR) increases by about 10% of the seasonal total with large increase in the eastern Bay of Bengal and along the west coast of India. In addition, the frequency of occurrence of La Nina-like cooling events in the equatorial Pacific increases and the correlation between ISMR and Pacific SST anomalies become stronger. The teleconnection between the SST anomalies in the Pacific and monsoon is effected via upper tropospheric meridional temperature gradient and the North African-Asian Jet axis.
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