Relative role of pre-monsoon conditions and intraseasonal oscillations in 
determining early-vs-late indian monsoon intensity in a GCM

Ghosh, Rohit; Chakraborty, Arindam; Nanjundiah, Ravi S.

doi:10.1007/s00704-016-1970-z

Item

ITEM ACTIONSEXPORT

Add to Basket

Please note that a newer version of this item is available:
https://pure.mpg.de/pubman/item/item_2378295_9

DetailsSummary

Released

Journal Article

Relative role of pre-monsoon conditions and intraseasonal oscillations in determining early-vs-late indian monsoon intensity in a GCM

MPS-Authors

/persons/resource/persons202514

Ghosh, Rohit
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

10.1007%2Fs00704-016-1970-z.pdf
(Publisher version), 4MB

Supplementary Material (public)

There is no public supplementary material available

Citation

Ghosh, R., Chakraborty, A., & Nanjundiah, R. S. (2016). Relative role of pre-monsoon conditions and intraseasonal oscillations in determining early-vs-late indian monsoon intensity in a GCM. Theoretical and Applied Climatology, available online. doi:10.1007/s00704-016-1970-z.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-2F67-6

Abstract

The aim of this paper is to identify relative roles of different land-atmospheric conditions, apart from sea surface temperature (SST), in determining early vs. late summer monsoon intensity over India in a high resolution general circulation model (GCM). We find that in its early phase (June--July; JJ), pre-monsoon land-atmospheric processes play major role to modulate the precipitation over Indian region. These effects of pre-monsoon conditions decrease substantially during its later phase (August--September; AS) for which the interannual variation is mainly governed by the low frequency northward propagating intraseasonal oscillations. This intraseasonal variability which is related to mean vertical wind shear has a significant role during the early phase of monsoon as well. Further, using multiple linear regression, we show that interannual variation of early and late monsoon rainfall over India is best explained when all these land-atmospheric parameters are taken together. Our study delineates the relative role of different processes affecting early versus later summer monsoon rainfall over India that can be used for determining its subseasonal predictability.