English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  Circumglobal wave train and the summer monsoon over northwestern India and Pakistan: The explicit role of the surface heat low

Saeed, S., Mueller, W. A., Hagemann, S., & Jacob, D. (2011). Circumglobal wave train and the summer monsoon over northwestern India and Pakistan: The explicit role of the surface heat low. Climate Dynamics, 37, 1045-1060. doi:10.1007/s00382-010-0888-x.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-F667-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-42E3-A
Genre: Journal Article

Files

show Files
hide Files
:
s00382-010-0888-x.pdf (Publisher version), 3MB
 
File Permalink:
-
Name:
s00382-010-0888-x.pdf
Description:
Archivkopie
OA-Status:
Visibility:
Restricted ( Max Planck Society (every institute); )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
2011
Copyright Info:
© Springer
License:
-

Locators

show

Creators

show
hide
 Creators:
Saeed, S.1, Author           
Mueller, W. A.2, Author           
Hagemann, S.3, Author           
Jacob, Daniela4, 5, Author           
Affiliations:
1IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, ou_913547              
2Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913553              
3Terrestrial Hydrology, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913560              
4The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913550              
5B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, Bundesstraße 53, 20146 Hamburg, DE, ou_1863482              

Content

show
hide
Free keywords: -
 Abstract: This study examines the influence of the mid-latitude circulation on the surface heat low (HL) and associated monsoon rainfall over northwestern India and Pakistan using the ERA40 data and high resolution (T106L31) climate model ECHAM5 simulation. Special emphasis is given to the surface HL which forms over Pakistan and adjoining areas of India, Iran and Afghanistan during the summer season. A heat low index (HLI) is defined to depict the surface HL. The HLI displays significant correlations with the upper level mid-latitude circulation over western central Asia and low level monsoon circulation over Arabian Sea and acts as a bridge connecting the mid-latitude wave train to the Indian summer monsoon. A time-lagged singular value decomposition analysis reveals that the eastward propagation of the mid-latitude circumglobal wave train (CGT) influences the surface pressure anomalies over the Indian domain. The largest low (negative) pressure anomalies over the western parts of the HL region (i.e., Iran and Afghanistan) occur in conjunction with the upper level anomalous high that develops over western-central Asia during the positive phase of the CGT. The composite analysis also reveals a significant increase in the low pressure anomalies over Iran and Afghanistan during the positive phase of CGT. The westward increasing low pressure anomalies with its north–south orientation provokes enormous north–south pressure gradient (lower pressure over land than over sea). This in turn enables the moist southerly flow from the Arabian Sea to penetrate farther northward over northwestern India and Pakistan. A monsoon trough like conditions develops over northwestern India and Pakistan where the moist southwesterly flow from the Arabian Sea and the Persian Gulf converge. The convergence in association with the orographic uplifting expedites convection and associated precipitation over northwestern India and Pakistan. The high resolution climate model ECHAM5 simulation also underlines the proposed findings and mechanism.

Details

show
hide
Language(s): eng - English
 Dates: 2011
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 438301
DOI: 10.1007/s00382-010-0888-x
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Climate Dynamics
  Other : Clim. Dyn.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Heidelberg : Springer-International
Pages: - Volume / Issue: 37 Sequence Number: - Start / End Page: 1045 - 1060 Identifier: ISSN: 0930-7575
CoNE: https://pure.mpg.de/cone/journals/resource/954925568800