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The south asian monsoon and the tropospheric biennial oscillation (1997).
| Content Provider | CiteSeerX |
|---|---|
| Author | Loschnigg, Johannes Meehl, Gerald A. Webster, Peter J. Arblaster, Julie M. Compo, Gilbert P. |
| Abstract | The interaction of the Indian Ocean dynamics and the tropospheric biennial oscillation (TBO) is analyzed in the 300-yr control run of the National Center for Atmospheric Research (NCAR) Climate System Model (CSM). Sea surface temperature (SST) anomalies and equatorial ocean dynamics in the Indian Ocean are associated with the TBO and interannual variability of Asian–Australian monsoons in observations. The air–sea interactions involved in these processes in the coupled ocean–atmosphere model are analyzed, so as to diagnose the causes of the SST anomalies and their role in the development of a biennial cycle in the Indian–Pacific Ocean region. By using singular value decomposition (SVD) analysis, it is found that the model reproduces the dominant mechanisms that are involved in the development of the TBO’s influence on the south Asian monsoon: large-scale forcing from the tropical Pacific and regional forcing associated with both the meridional temperature gradient between the Asian continent and the Indian Ocean, as well as Indian Ocean SST anomalies. Using cumulative anomaly pattern correlation, the strength of each of these processes in affecting the interannual variability of both Asian and Australian monsoon rainfall is assessed. In analyzing the role of the Indian Ocean dynamics in the TBO, it is found that the Indian Ocean zonal mode (IOZM) is an inherent feature of the Asian summer monsoon and the TBO. The IOZM is thus a part of the |
| File Format | |
| Publisher Date | 1997-01-01 |
| Access Restriction | Open |
| Subject Keyword | South Asian Monsoon Tropospheric Biennial Oscillation Interannual Variability Indian Ocean Indian Ocean Dynamic Singular Value Decomposition Asian Australian Monsoon Asian Continent Atmospheric Research Equatorial Ocean Dynamic Regional Forcing Biennial Cycle National Center Inherent Feature Indian Ocean Sst Anomaly Cumulative Anomaly Pattern Correlation Australian Monsoon Rainfall Tropical Pacific 300-yr Control Run Climate System Model Dominant Mechanism Sst Anomaly Tbo Influence Sea Surface Temperature Coupled Ocean Meridional Temperature Gradient Indian Ocean Zonal Mode Air Sea Interaction Indian Pacific Ocean Region Large-scale Forcing Asian Summer Monsoon |
| Content Type | Text |
