热带气象学报
熱帶氣象學報
열대기상학보
2012年
6期
897-904
,共8页
中国近海%SST%El Ni?o Modoki%黑潮%异常偏北风
中國近海%SST%El Ni?o Modoki%黑潮%異常偏北風
중국근해%SST%El Ni?o Modoki%흑조%이상편북풍
offshore area of China and its adjacent waters%SST%El Ni?o Modoki%Kuroshio%anomalous northerlies
1970年代末以后,热带太平洋海区出现了一种类似 El Ni?o 但又与其有本质区别的现象:El Ni?o Modoki,与其相关的各种海洋大气异常变化给全球气候带来了独特的影响.利用 HadISST 海温和 NCEP/NCAR风场等再分析资料以及相关、回归和合成等统计方法,分析了 El Ni?o Modoki 与当年各季的中国近海及邻近海域海表温度(SST)的关系.结果表明:(1)夏季 El Ni?o Modoki 与同年秋季中国近海及邻近海域的 SST 有显著的负相关关系,显著相关区域主要分布于黑潮以东的大片海域.(2)夏季 El Ni?o Modoki 发生期间,菲律宾北部至中国近海及邻近海域的上空盛行异常偏北风,且热带西太平洋表层暖水东流,这不利于热带西太平洋暖水向中纬度地区的输送.分析结果还表明,海洋环境对风场有滞后的响应以及黑潮向北输送有减弱的现象,而这可能正是夏季 El Ni?o Modoki 影响秋季中国近海及邻近海域海温偏冷的重要原因.
1970年代末以後,熱帶太平洋海區齣現瞭一種類似 El Ni?o 但又與其有本質區彆的現象:El Ni?o Modoki,與其相關的各種海洋大氣異常變化給全毬氣候帶來瞭獨特的影響.利用 HadISST 海溫和 NCEP/NCAR風場等再分析資料以及相關、迴歸和閤成等統計方法,分析瞭 El Ni?o Modoki 與噹年各季的中國近海及鄰近海域海錶溫度(SST)的關繫.結果錶明:(1)夏季 El Ni?o Modoki 與同年鞦季中國近海及鄰近海域的 SST 有顯著的負相關關繫,顯著相關區域主要分佈于黑潮以東的大片海域.(2)夏季 El Ni?o Modoki 髮生期間,菲律賓北部至中國近海及鄰近海域的上空盛行異常偏北風,且熱帶西太平洋錶層暖水東流,這不利于熱帶西太平洋暖水嚮中緯度地區的輸送.分析結果還錶明,海洋環境對風場有滯後的響應以及黑潮嚮北輸送有減弱的現象,而這可能正是夏季 El Ni?o Modoki 影響鞦季中國近海及鄰近海域海溫偏冷的重要原因.
1970년대말이후,열대태평양해구출현료일충유사 El Ni?o 단우여기유본질구별적현상:El Ni?o Modoki,여기상관적각충해양대기이상변화급전구기후대래료독특적영향.이용 HadISST 해온화 NCEP/NCAR풍장등재분석자료이급상관、회귀화합성등통계방법,분석료 El Ni?o Modoki 여당년각계적중국근해급린근해역해표온도(SST)적관계.결과표명:(1)하계 El Ni?o Modoki 여동년추계중국근해급린근해역적 SST 유현저적부상관관계,현저상관구역주요분포우흑조이동적대편해역.(2)하계 El Ni?o Modoki 발생기간,비률빈북부지중국근해급린근해역적상공성행이상편북풍,차열대서태평양표층난수동류,저불리우열대서태평양난수향중위도지구적수송.분석결과환표명,해양배경대풍장유체후적향응이급흑조향북수송유감약적현상,이저가능정시하계 El Ni?o Modoki 영향추계중국근해급린근해역해온편랭적중요원인.
El Ni?o Modoki, a new type of tropical Pacific phenomenon, which is similar but different from canonical El Ni?o, has been observed since the late 1970s, followed by its unique influence on global climate. In this paper, relationships between four seasons’ SST in the offshore area of China and its adjacent waters and El Ni?o Modoki have been compared and analyzed based on HadISST dataset and NCEP\NCAR wind data. Significant negative correlation is found between El Ni?o Modoki in summer and SST in the offshore area of China and its adjacent waters in autumn with the significant regions located in the east of the Kuroshio. During the El Ni?o Modoki period, anomalous northerly winds prevail over the northern part of the Philipinese to the offshore area of China. It is therefore suggested that the northerlies are unfavorable for the transportation of warm water from the western tropic Pacific to mid-latitude areas. Consequently, El Ni?o Modoki in summer may contribute to the cold SSTs in the offshore area of China and its adjacent waters in autumn because of the lagging response of the ocean to winds and the weakening northward transportation of Kuroshio.
