Publication Date:
2017-04-04
Description:
A multi-model set of atmospheric simulations forced by historical sea surface
temperature (SST) or SSTs plus Greenhouse gases and aerosol forcing agents for the
period of 1950-1999 is studied to identify and understand which components of the
Asian-Australian monsoon (A-AM) variability are forced and reproducible. The
analysis focuses on the summertime monsoon circulations, comparing model results
against the observations. The priority of different components of the A-AM
circulations in terms of reproducibility is evaluated. Among the subsystems of the
wide A-AM, the South Asian monsoon and the Australian monsoon circulations are
better reproduced than the others, indicating they are forced and well modeled. The
primary driving mechanism comes from the tropical Pacific. The western North
Pacific monsoon circulation is also forced and well modeled except with a slightly
lower reproducibility due to its delayed response to the eastern tropical Pacific
forcing. The simultaneous driving comes from the western Pacific surrounding the
maritime continent region. The Indian monsoon circulation has a moderate
reproducibility, partly due to its weakened connection to June-July-August SSTs in
the equatorial eastern Pacific in recent decades. Among the A-AM subsystems, the
East Asian summer monsoon has the lowest reproducibility and is poorly modeled.
This is mainly due to the failure of specifying historical SST in capturing the zonal
land-sea thermal contrast change across the East Asia. The prescribed tropical
Indian Ocean SST changes partly reproduce the meridional wind change over East
Asia in several models. For all the A-AM subsystem circulation indices, generally
the MME is always the best except for the Indian monsoon and East Asian monsoon
circulation indices.
Description:
Submitted
Description:
3.7. Dinamica del clima e dell'oceano
Description:
JCR Journal
Description:
open
Keywords:
monsoon
;
AGCM
;
CLIVAR C20C
;
01. Atmosphere::01.01. Atmosphere::01.01.02. Climate
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
manuscript
