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91.
In order to investigate the spatial patterns of the Tropospheric Biennial Oscillation (TBO) on the global scale, the Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) monthly averaged precipitation and the Climate Diagnostics Center (CDC) monthly outgoing long-wave radiation (OLR) and SST are used in conjunction with TBO bandpass-filtering. The results indicate active biennial variability in the tropical eastern-central Pacific regions. It is evident that observations reflect the biennial component of the ENSO rather than the TBO itself. Since some studies have pointed out that the TBO is a broad-scale phenomenon differing from the ENSO, to investigate the pure TBO the ENSO signal must be excluded. The Scale Interaction Experiment-FRCGC (SINTEX-F) coupled general circulation model (CGCM) developed at Japan Frontier Research Center for Global Change (FRCGC) can capture both the ENSO and the biennial signals. Air-sea interactions in the tropical eastern-central Pacific are decoupled to eliminate the effects of ENSO in a experiment by SINTEX-F and the results show that biennial variability still exists even without ENSO. It seems to mean that the TBO and ENSO are independent from each other. Furthermore, the model results indicate that the two key regions are southwest Sumatra and the tropical western Pacific for the TBO cycle. 相似文献
92.
FEATURES AND COMPARISONS OF THE QUASI-BIENNIAL VARIATIONS IN THE ASIA-PACIFIC MONSOON SUBSYSTEMS 总被引:1,自引:0,他引:1
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. 相似文献
93.