doi:  10.3878/j.issn.1006-9895.1712.17253
热带太平洋-印度洋海温联合模及其气候影响*

Tropical Pacific-Indian Ocean Associated Modeand Its Climate Influences
摘要点击 929  全文点击 132  投稿时间:2017-10-17  修订日期:2017-11-21
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基金:  国家“973”项目(2013CB956203)及国家自然科学基金项目(41490642、41520104008)
中文关键词:  太平洋-印度洋海温(异常)联合模(PIOAM),特征和演变,高分辨海洋环流模式LICOM2.0模拟,EOF分解,海洋次表层
英文关键词:  Topical  Pacific-Indian  Ocean Associated  Mode (PIOAM), feature  and evolution, the  simulation with  high resolution  oceanic general  circulation model (LICOM2.0), EOF  analyses, ocean  subsurface.
        
作者中文名作者英文名单位
李崇银Li Chongyin中国科学院大气物理研究所
黎 鑫国防科技大学气象海洋学院;、中国科学院大气物理研究所
杨 辉、潘 静、李 刚国防科技大学气象海洋学院;、中国科学院大气物理研究所;、中国科学院大气物理研究所;、中国西昌卫星发射中心;、中国西昌卫星发射中心
引用:李崇银,黎 鑫,杨 辉、潘 静、李 刚.2018.热带太平洋-印度洋海温联合模及其气候影响*[J].大气科学
Citation:Li Chongyin.2018.Tropical Pacific-Indian Ocean Associated Modeand Its Climate Influences[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文基于观测资料和LICOM2.0模拟结果的分析研究,简要介绍讨论了太平洋-印度洋海温(异常)联合模(PIOAM)的存在、特征、演变及其影响等问题。热带太平洋-印度洋区域乃至全球范围的SSTA资料进行EOF分解,都清楚表明其第一分量在热带太平洋-印度洋的空间形态与太平洋-印度洋海温(异常)联合模(PIOAM)非常相似,说明PIOAM是热带太平洋-印度洋实实在在存在的一种海温异常模态。对应PIOAM的正、负位相,热带印度洋和西太平洋地区的夏季(JJA)850距平风场有近乎相反的异常流场形势;对流层低层的Walker环流支和亚洲夏季风都出现了不同特征的(近乎相反)异常;在PIOAM正(负)位相将使得100hPa的南亚高压位置偏东(西)。对热带太平洋和印度洋温跃层曲面上的海温异常(为了方便将其称为SOTA)进行EOF分解,发现其第一模态也是一个三极子模态,即当赤道中西印度洋大部分海域与赤道中东太平洋大部分海域偏暖(偏冷)时,赤道东印度洋和赤道西太平洋大部分海域则偏冷(偏暖);它与太平洋-印度洋表层的PIOAM十分类似,也表明PIOAM在海洋次表层也是存在的。高分辨海洋环流模式LICOM2.0的模拟结果,无论是对太平洋-印度洋表层还是次表层的PIOAM的特征和演变都刻画得很好,这从另一个角度进一步说明PIOAM是热带太平洋-印度洋实际存在的一种海温变化模态。PIOAM正、负位相不仅对亚洲及西太平洋地区的天气气候有非常不一样的影响(不少地方有反向的特征),还会对南北美洲和非洲一些地区有不一样的影响;而且其影响与单独的ElNino 及印度洋偶极子(IOD)都有些不一样。
Abstract:
      Based on the observation data and the simulation results by LICOM2.0 model, a synthetical introduction with regard to exist, feature, evolution and its influnces of Pacific-Indian Ocean associated mode (PIOAM) are given in this paper. The EOF analyses with SSTA both in the tropical Pacific-Indian Ocean and in the global ocean all show that the EOF-1 pattern in the tropical Pacific-Indian Ocean is perfectly similar the PIOAM and means the PIOAM is a very real oceanic temperature anomalies mode in the tropical Pacific-Indian Ocean. Corresponding to positive and negative phases of the PIOAM, the anomaly wind field at 850hPa over the tropical Pacific-Indian Ocean in summer (JJA) is close to opposite pattern, the Walker circulation at lower troposphere and the Asian summer monsoon have different anomalous (close to opposite) futures. In positive (negative) phase of the PIOAM, the location of the South Asia High will be on the east (west) side. The EOF analyses with oceanic temperature anomalies (SOTA) at the thermocline camber in the tropical Pacific-Indian Ocean also show that the EOF-1 is a triangle mode similar to the PIOAM at the sea surface. This means the PIOAM is also in the oceanic subsurface. The numerical simulation in high resolution oceanic circulation model LICOM2.0 shows that when the tropical central-western Indian Ocean and central-eastern Pacific is abnormal warmer/colder, the tropical eastern Indian Ocean and western Pacific is correspondingly colder/warmer. This further confirms the tropical PIOAM is an important mode which is not only significant in sea surface temperature anomaly (SSTA) field, but also more obviously in the subsurface ocean temperature anomaly (SOTA) field. The positive and negative phases of the PIOAM not only affect the weather / climate in Asian and west Pacific regions, but also in south-north American and Africa regions. The influences of the PIOAM are different with the ENSO and IOD.
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