CAJ | 학술논문

利用复EOF分析,将热带太平洋5月份的大气风场和海洋上层流场看作1个整体,对其作了动力统计诊断,用以揭示热带太平洋5月份大气、海洋环流异常与长江流域梅雨丰欠的关系并考察其年际和年代际变化.诊断结果表明:在同一EOF模态中,大气部分和海洋部分的结构有很大不同,海洋模态表现出较强的赤道陷波特征;在南、北纬5°之外,海洋流场已大幅衰减掉了,而大气风场该现象不明显.EOF第1模态模的时间系数振幅从1994年起增大趋势明显,这表明气候变化剧烈程度在加大;前2个EOF模态的时间系数均具有明显的年际和年代际变化.EOF第1模态为长江流域梅雨丰欠异常模态,大气存在经圈环流异常.EOF第2模态为ENSO模态,大气存在纬圈环流异常.黑潮因处5°N以北,已离开赤道,故其流速虽大,但流场偏差则很小,即其流速异常不明显.
이용복EOF분석,장열대태평양5월빈적대기풍장화해양상층류장간작1개정체,대기작료동력통계진단,용이게시열대태평양5월빈대기、해양배류이상여장강류역매우봉흠적관계병고찰기년제화년대제변화.진단결과표명:재동일EOF모태중,대기부분화해양부분적결구유흔대불동,해양모태표현출교강적적도함파특정;재남、북위5°지외,해양류장이대폭쇠감도료,이대기풍장해현상불명현.EOF제1모태모적시간계수진폭종1994년기증대추세명현,저표명기후변화극렬정도재가대;전2개EOF모태적시간계수균구유명현적년제화년대제변화.EOF제1모태위장강류역매우봉흠이상모태,대기존재경권배류이상.EOF제2모태위ENSO모태,대기존재위권배류이상.흑조인처5°N이북,이리개적도,고기류속수대,단류장편차칙흔소,즉기류속이상불명현.
The CEOF analysis is used to make the dynamic statistics and diagostics of the integrated system which consists of the wind field in the atmosphere and the upper-layer current fields in the waters of the tropical Pacific Ocean in May, and to reveal not only the relation between the circulation abnomality of both the atmosphere and the ocean, and the Meiyu rainfall in the Yangtze River Basin but also the related interannual and interdecadal vavia-tions. As the results show, the oceanic structure corresponding to a certain EOF mode is greatly different from the atmospheric structure corresponding to the same mode. The equatorial trapped-wave feafures can be found in the o-ceanic current field corresponding to the mode, and the current strength becomes greatly decreased in the waters northward from 5°N and southward from 5°S, In the contrast with the current, the wind seems less changed in the atmosphere. The fluctuating amplitude of the time coefficient corresponding to the 1st EOF mode has becomed greater since 1994, indicating the stronger climatic variability. The obvious interannual and interdecadal variation can be found in the time cofficient fluctuation respectively corresponding to the 1st mode and the 2nd mode. The 1st mode is colsely related to the Meiyu rainfall abnormality in the Yangtze River Basin and the meridional circulation abnormality in the atmosphere, while the 2nd EOF mode is related to the ENSO variation and the zonal circulation abnormality in the atmosphere. Kuroshio flows at a greater speed in the sea area further away from 5°S, the current field keeps steady, and its speed does not have much abnormality.