Journal of Tropical Oceanography >
Basic mode of subtropical high’s seasonal oscillation and its relationship with low-frequency potential wave
Received date: 2008-12-25
Revised date: 2009-06-03
Online published: 2010-07-29
Supported by
江苏省气象灾害重点实验室开放课题(KLME0507); 热带海洋气象科学基金(200609); 国家自然科学基金资助项目(40375019)
Based on the daily-averaged data derived from the NCEP/NCAR reanalysis dataset and using the single-layer (500hPa, and 850hPa) and the whole-layer (four layers) EOF methods, the leading modes of the subtropical high with vertical structure are extracted. It is found that the modes obtained by different ways are the same, which implies that there truly exist the same spatial distribution and temporal-change features from high to low of the subtropical high. Further, by applying the wavelet energy spectrum, it is found that there exist marked low-frequency oscillations of 20−30 days and 30−60 days. Considering the weather in 1995, the possible mechanism that the low-frequency potential wave at different latitude restricted the subtropical high in 1995 is diagnosed, i.e., the low-frequency potential wave of sub-tropical areas restricted the medium-term movement with a period of 20 days of the main body of the subtropical high, while the short-term process with a period of 5−10 days of the western subtropical high was related to the accumulated disturbance energy of the low-frequency potential wave coming from high latitude and tropical areas in the western Pacific region.
YU Dan-dan,ZHANG Ren,TENG Jun,WAN Ying-hu . Basic mode of subtropical high’s seasonal oscillation and its relationship with low-frequency potential wave[J]. Journal of Tropical Oceanography, 2010 , 29(4) : 32 -39 . DOI: 10.11978/j.issn.1009-5470.2010.04.032
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