Indian summer monsoon in future climate projection by a super high-resolution global model
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Indian summer monsoon in future climate
projection by a super high-resolution
global model
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| Creator |
K, Rajendran
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| Subject |
Climate Modelling
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| Description |
The impact of future climate change on the Indian
summer monsoon has been investigated using a super
high-resolution global general circulation model. The
model with approximately 20-km mesh horizontal
resolution can resolve features on finer spatial scales,
which were till now resolved by employing highresolution
regional models. Regional models are known
to have high dependency on the lateral boundary forcing
and significant inability to represent regionalglobal
scale interactions comprehensively. Another
advantage of the 20-km global model is its fidelity in
representing the regional distribution of the presentday
monsoon rainfall. Super high-resolution future
scenario for the Indian summer monsoon shows widespread
but spatially varying increase in rainfall over
the interior regions and significant reduction in orographic
rainfall over the west coasts of Kerala and
Karnataka and the eastern hilly regions around Assam.
Over these regions, the drastic reduction of wind by
steep orography predominates over the moisture
build-up effect (that causes enhanced rainfall over
other parts) in reducing the rainfall. This indicates
that monsoon rainfall is strongly controlled by parameterized
physics and high-resolution processes which
need to be resolved with adequately high resolution.
The model projects substantial, spatially heterogeneous
increase in both extreme hot and heavy rainfall events
over most parts of India by the end of the century.
While fine-scale surface moisture feedbacks influence
the response of extreme hot events, extreme precipitation
is influenced by fine-scale orography, evaporation,
moisture content and circulation. Thus, the results
indicate that consideration of fine-scale processes is
critical for accurate assessment of local and regionalscale
vulnerability to climate change.
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| Publisher |
Indian Academy of Sciences
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| Date |
2008-12-10
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/109/1/rajendran_08b.pdf
K, Rajendran (2008) Indian summer monsoon in future climate projection by a super high-resolution global model. Current Sciences , 95 (11). pp. 1560-1569. ISSN 0011-3891 |
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| Relation |
http://www.ias.ac.in/currsci
http://cir.cmmacs.ernet.in/109/ |
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