Identification

Title

Changing links between South Asian summer monsoon circulation and tropospheric land-sea thermal contrasts under a warming scenario

Abstract

Forced with increased greenhouse gases, the South Asian summer monsoon (SASM) circulation weakens in climate models, which appears inconsistent with the projected increases in near-surface land-sea thermal contrasts during the 21st century. Our analysis shows that the SASM intensity positively correlates with the land-sea thermal contrast in both the lower- and upper-troposphere before year 2000; thereafter a reduced upper-tropospheric thermal contrast leads to a weakened SASM circulation, despite an increasing lower-tropospheric thermal contrast. The decrease in the upper-tropospheric thermal contrast mainly results from enhanced upper-tropospheric warming over the tropical Indian Ocean due to increased latent heating. The results suggest a crucial role of enhanced tropical convection in the weakening of SASM circulation and a weak influence of lower-tropospheric thermal contrast on the SASM under global warming. They also imply a less important role of near-surface processes over the Tibetan Plateau in the long-term SASM change during the 21st century.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7sn0b73

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2010-01-21T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact