CaltechAUTHORS
  A Caltech Library Service

Interannual Variability in the Large-Scale Dynamics of the South Asian Summer Monsoon

Walker, Jennifer M. and Bordoni, Simona and Schneider, Tapio (2015) Interannual Variability in the Large-Scale Dynamics of the South Asian Summer Monsoon. Journal of Climate, 28 (9). pp. 3731-3750. ISSN 0894-8755. http://resolver.caltech.edu/CaltechAUTHORS:20150522-100044286

[img] PDF - Published Version
See Usage Policy.

4Mb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150522-100044286

Abstract

This study identifies coherent and robust large-scale atmospheric patterns of interannual variability of the South Asian summer monsoon (SASM) in observational data. A decomposition of the water vapor budget into dynamic and thermodynamic components shows that interannual variability of SASM net precipitation (P − E) is primarily caused by variations in winds rather than in moisture. Linear regression analyses reveal that strong monsoons are distinguished from weak monsoons by a northward expansion of the cross-equatorial monsoonal circulation, with increased precipitation in the ascending branch. Interestingly, and in disagreement with the view of monsoons as large-scale sea-breeze circulations, strong monsoons are associated with a decreased meridional gradient in the near-surface atmospheric temperature in the SASM region. Teleconnections exist from the SASM region to the Southern Hemisphere, whose midlatitude poleward eddy energy flux correlates with monsoon strength. Possible implications of these teleconnection patterns for understanding SASM interannual variability are discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1175/JCLI-D-14-00612.1DOIArticle
http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-14-00612.1PublisherArticle
ORCID:
AuthorORCID
Schneider, Tapio0000-0001-5687-2287
Additional Information:© 2015 American Meteorological Society. Received: September 2, 2014; Final Form: December 24, 2014. This work was supported by a Natural Sciences and Engineering Research Council of Canada Postgraduate Scholarship, the Caltech Terrestrial Hazard Observation and Reporting Center, and National Science Foundation Grants AGS-1019211 and AGS-1049201. The data analyses were conducted on Caltech’s Division of Geological and Planetary Science CITerra computing cluster.
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Caltech Terrestrial Hazard Observation and Reporting (THOR) CenterUNSPECIFIED
NSFAGS-1019211
NSFAGS-1049201
Subject Keywords:Atmospheric circulation, Large-scale motions, Meridional overturning circulation, Teleconnections, Monsoons, Interannual variability
Record Number:CaltechAUTHORS:20150522-100044286
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150522-100044286
Official Citation:Jennifer M. Walker, Simona Bordoni, and Tapio Schneider, 2015: Interannual Variability in the Large-Scale Dynamics of the South Asian Summer Monsoon. J. Climate, 28, 3731–3750. doi: http://dx.doi.org/10.1175/JCLI-D-14-00612.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57772
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:22 May 2015 20:08
Last Modified:22 May 2015 20:08

Repository Staff Only: item control page