FEATURES AND COMPARISONS OF THE QUASI-BIENNIAL VARIATIONS IN THE ASIA-PACIFIC MONSOON SUBSYSTEMS |
| |
Authors: | ZHENG Bin LI Chun-hui LIN Ai-lan and GU De-jun |
| |
Affiliation: | Guangzhou Institute of Tropical and Marine Meteorology / Key Open I,aboratory for Tropical Monsoon, China Meteorological Administration,Guangzhou 510080 China |
| |
Abstract: | The National Centers for Environmental Prediction (NCEP) reanalysis data, Climate
Diagnostics Center Merged Analysis of Precipitation (CMAP) results, and NOAA Extended Reconstructed
Sea Surface Temperature (SST), have been utilized in this paper to study the quasi-biennial variations in
Asia-Pacific monsoon subsystems and associated SST anomalies (SSTA) and wind anomalies. Four
monsoon indices are computed from NCEP/ National Center for Atmospheric Research (NCAR) reanalysis
to represent the South Asian monsoon (SAM), South China Sea summer monsoon (SCSSM), Western
North Pacific monsoon (WNPM) and East Asian monsoon (EAM), respectively. The quasi-biennial periods
are very significant in Asia-Pacific monsoons (as discovered by power spectrum analysis), and for SAM
and EAM---with moderate effects by El Ni?o-Southern Oscillation (ENSO)---the quasi-biennial periods are
the most important factor. For SCSSM and WNPM (once again due to the effects of ENSO), the
quasi-biennial periods are of secondary durations. There are obvious interdecadal variations in the
quasi-biennial modes of the Asia-Pacific monsoon, so in the negative phase the biennial modes will not be
significant or outstanding. The wind anomalies and SSTA associated with the biennial modes are very
different in the SAM, WNPM and EAM regions. Since the WNPM and SCSSM are very similar in the
biennial modes, they can be combined into one subsystem, called SCS/WNPM. |
| |
Keywords: | Asia-Pacific monsoon power spectrum wave filtering monsoon indices quasi-biennial variation |
本文献已被 维普 万方数据 等数据库收录! |
| 点击此处可从《热带气象学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《热带气象学报(英文版)》下载全文 |
|