The role of the Indian Summer Monsoon variability on Arabian Peninsula summer climate
Type
ArticleAuthors
Attada, RajuDasari, Hari Prasad

Parekh, Anant
Chowdary, Jasti S.
Langodan, Sabique

Knio, Omar

Hoteit, Ibrahim

KAUST Department
Applied Mathematics and Computational Science ProgramBeacon Development Company
Biological and Environmental Sciences and Engineering (BESE) Division
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Earth Fluid Modeling and Prediction Group
Earth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Red Sea Research Center (RSRC)
Date
2018-06-28Online Publication Date
2018-06-28Print Publication Date
2019-03Permanent link to this record
http://hdl.handle.net/10754/630451
Metadata
Show full item recordAbstract
This study investigates the influence of the Indian Summer Monsoon (ISM) on the atmospheric circulation over the Arabian Peninsula (AP) using the European Centre for Medium Range Weather Forecasts’ twentieth century reanalysis (ERA-20C) for the period 1901–2010. After describing the summer climate of the AP using various dynamic and thermodynamic parameters, we investigate the link between extreme ISMs and atmospheric circulation over the AP on inter-annual time scale. Analysis of composites of different parameters during extreme monsoon (strong and weak) years reveals that the ISM plays an important role in the summer circulation over the AP and adjoining regions. The major noticeable changes in modulating circulation during extreme monsoons are: (1) a strengthening of lower tropospheric northerly winds, westerly winds passing through the Tokar Gap, Shamal winds, and the upper tropospheric easterly jet stream during strong ISM; (2) a northward (southward) shift of the subtropical westerly jet stream during strong (weak) monsoon years; (3) the development of strong upper level ridge above the surface thermal low during strong ISM years, which result in a baroclinic structure over the AP and adjoining regions; (4) an increase in adiabatic warming, and hence aridity, over the AP during strong monsoon years, caused by intense subsidence of the middle to upper troposphere due to zonal overturning circulation; and (5) convective instability during strong monsoon years caused by an intensification of the upward motion over the southern AP. Furthermore, during strong monsoons, the availability of excess moisture leads to atmospheric instability, which in turn triggers the formation of clouds that lead to more rainfall over the southwestern AP. Finally, the westward propagation of a Gill-type Rossby waves induced by the ISM play an important role in the variations of the AP summer climate by enhancing the warm core structure over the AP and through their interaction with the midlatitude westerlies during strong monsoons.Citation
Attada R, Dasari HP, Parekh A, Chowdary JS, Langodan S, et al. (2018) The role of the Indian Summer Monsoon variability on Arabian Peninsula summer climate. Climate Dynamics. Available: http://dx.doi.org/10.1007/s00382-018-4333-x.Sponsors
This study was supported by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia and the Saudi ARAMCO-KAUST Marine Environmental Research Center (SAKMERC). It made use of the Supercomputing Laboratory and computer clusters at KAUST. The authors thank the anonymous reviewers for the insightful comments on the manuscript.Publisher
Springer NatureJournal
Climate DynamicsAdditional Links
https://link.springer.com/article/10.1007%2Fs00382-018-4333-xae974a485f413a2113503eed53cd6c53
10.1007/s00382-018-4333-x