Monsoon Dynamics with Interactive Forcing. Part II: Impact of Eddies and Asymmetric Geometries
Open Access
- 1 May 2007
- journal article
- Published by American Meteorological Society in Journal of the Atmospheric Sciences
- Vol. 64 (5), 1431-1442
- https://doi.org/10.1175/jas3917.1
Abstract
The roles of eddies and forcing asymmetry in the dynamics of the large-scale monsoon circulation are investigated with a general circulation model. The net impact of eddies is found to be a slight weakening of the zonal mean monsoon circulation. The eddies strongly impact the momentum budget of the circulation, but the qualitative behavior of the monsoon flow is not substantially altered. The introduction of asymmetric forcing reveals the limitations of axisymmetric studies in representing the fully three-dimensional monsoon. Advection of low subcloud moist static energy air from the midlatitude oceans is seen to strongly impact the subcloud moist static energy budget in the continental subtropics, limiting the poleward extent of the monsoon. The advection of low moist static energy air must be blocked by orography, or the source of low moist static energy air must be removed, in order to induce strong precipitation over the subtropical landmass. An equatorial SST gradient is needed to induce a cross-equatorial meridional monsoon circulation. The location of the maximum subcloud moist static energy remains a good indicator for the limit of the monsoon.Keywords
This publication has 17 references indexed in Scilit:
- Mechanisms Limiting the Northward Extent of the Northern Summer Monsoons over North America, Asia, and Africa*Journal of Climate, 2003
- Ocean‐atmosphere‐land feedbacks in an idealized monsoonQuarterly Journal of the Royal Meteorological Society, 2001
- Temperature profiles in radiative‐convective equilibrium above surfaces at different heightsJournal of Geophysical Research: Atmospheres, 1999
- Land‐sea geometry and its effect on monsoon circulationsJournal of Geophysical Research: Atmospheres, 1998
- A Model of the Asian Summer Monsoon. Part I: The Global ScaleJournal of the Atmospheric Sciences, 1995
- Effects of Saturated and Dry Land Surfaces on the Tropical Circulation and Precipitation in a General Circulation ModelJournal of Climate, 1991
- Some simple solutions for heat‐induced tropical circulationQuarterly Journal of the Royal Meteorological Society, 1980
- The composite structure of the monsoon depressionTellus A: Dynamic Meteorology and Oceanography, 1977
- The Role of Mountains in the South Asian Monsoon CirculationJournal of the Atmospheric Sciences, 1975
- Study of a Monsoon Depression (I)Journal of the Meteorological Society of Japan. Ser. II, 1975