NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Simulation of the Onset of the Southeast Asian Monsoon during 1997 and 1998: The Impact of Surface ProcessesThe onset of the southeast Asian monsoon during 1997 and 1998 was simulated with a coupled mesoscale atmospheric model (MM5) and a detailed land surface model. The rainfall results from the simulations were compared with observed satellite data from the TRMM (Tropical Rainfall Measuring Mission) TMI (TRMM Microwave Imager) and GPCP (Global Precipitation Climatology Project). The simulation with the land surface model captured basic signatures of the monsoon onset processes and associated rainfall statistics. The sensitivity tests indicated that land surface processes had a greater impact on the simulated rainfall results than that of a small sea surface temperature change during the onset period. In both the 1997 and 1998 cases, the simulations were significantly improved by including the land surface processes. The results indicated that land surface processes played an important role in modifying the low-level wind field over two major branches of the circulation; the southwest low-level flow over the Indo-China peninsula and the northern cold front intrusion from southern China. The surface sensible and latent heat exchange between the land and atmosphere modified the low-level temperature distribution and gradient, and therefore the low-level. The more realistic forcing of the sensible and latent heat from the detailed land surface model improved the monsoon rainfall and associated wind simulation. The model results will be compared to the simulation of the 6-7 May 2000 Missouri flash flood event. In addition, the impact of model initialization and land surface treatment on timing, intensity, and location of extreme precipitation will be examined.
Document ID
20040171423
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Tao, W.-K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wang, Y.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lau, W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Baker, R. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: 7th Workshop on Regional Climate Simulation
Location: Jhong-Li
Country: Taiwan, Province of China
Start Date: September 27, 2004
End Date: September 29, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available