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    The role of the Indian Summer Monsoon variability on Arabian Peninsula summer climate

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    Type
    Article
    Authors
    Attada, Raju
    Dasari, Hari Prasad cc
    Parekh, Anant
    Chowdary, Jasti S.
    Langodan, Sabique cc
    Knio, Omar cc
    Hoteit, Ibrahim cc
    KAUST Department
    Applied Mathematics and Computational Science Program
    Beacon 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
    2018-06-28
    Online Publication Date
    2018-06-28
    Print Publication Date
    2019-03
    Permanent link to this record
    http://hdl.handle.net/10754/630451
    
    Metadata
    Show full item record
    Abstract
    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 Nature
    Journal
    Climate Dynamics
    DOI
    10.1007/s00382-018-4333-x
    Additional Links
    https://link.springer.com/article/10.1007%2Fs00382-018-4333-x
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00382-018-4333-x
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Applied Mathematics and Computational Science Program; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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