Mean climate and representation of jet streams in the CORDEX South Asia simulations by the regional climate model RCA4 | Health & Environmental Research Online (HERO)

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Tags

HERO ID

4313583

Reference Type

Journal Article

Title

Mean climate and representation of jet streams in the CORDEX South Asia simulations by the regional climate model RCA4

Author(s)

Iqbal, W; Syed, FS; Sajjad, H; Nikulin, G; Kjellstrom, E; Hannachi, A

Year

2017

Is Peer Reviewed?

Journal

Theoretical and Applied Climatology
ISSN: 0177-798X
EISSN: 1434-4483

Volume

129

Issue

1-2

Page Numbers

1-19

DOI

10.1007/s00704-016-1755-4

Web of Science Id

WOS:000403666400001

Abstract

A number of simulations with the fourth release of the Rossby Center Regional Climate Model (RCA4) conducted within the COordinated Regional climate Downscaling EXperiment (CORDEX) framework for South Asia at 50 km horizontal resolution are evaluated for mean winter (December-March) and summer (June-September) climate during 1980-2005. The two driving data sets ERA-Interim reanalysis and the general circulation model EC-Earth have been analyzed besides the RCA4 simulations to address the added value. RCA4 successfully captures the mean climate in both the seasons. The biases in RCA4 appear to come from the driving data sets which are amplified after downscaling. The jet streams influencing the seasonal precipitation variability in both seasons are also analyzed. The spatial and quantitative analysis over CORDEX South Asia generally revealed the ability of RCA4 to capture the mean seasonal climate as well as the position and strength of the jet streams despite weak/strong jet representation in the driving data. The EC-Earth downscaled with RCA4 exhibited cold biases over the domain and a weak Somali jet over the Arabian Sea. Moreover, the moisture transport from the Arabian Sea during summer is pronounced in RCA4 simulations resulting in enhanced monsoon rainfall over northwestern parts of India. Both the Somali jet and the tropical easterly jet become stronger during strong summer monsoon years. However, there is robust impact of wet years in summer over the Somali jet. Wet-minus-dry composites in winter indicate strengthening (weakening) of the subtropical jet in RCA4 run by ERA-Interim (EC-Earth). The driving data have clear reflections on the RCA4 simulations.