| 热带西北太平洋与东南印度洋对流活动年际变化联系的年代际改变 |
| |
| 引用本文： | 张奔奔,管兆勇,张萌萌.热带西北太平洋与东南印度洋对流活动年际变化联系的年代际改变[J].大气科学学报,2018,41(6):753-761. |
| |
| 作者姓名： | 张奔奔 管兆勇 张萌萌 |
| |
| 作者单位： | 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044,南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044,南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044 |
| |
| 基金项目： | 国家自然科学基金重点资助项目（41330425）；公益性行业（气象）科研专项（GYHY201406024）；江苏高校优势学科建设工程资助项目（PAPD） |
| |
| 摘 要： | 采用美国NOAA卫星观测OLR (outing longwave radiation)资料以及NCEP/NCAR、CM AP月平均资料,利用合成分析等方法,研究了热带西北太平洋(125°～140°E,10°～20°N)与热带东南印度洋(90°～105°E,5°～15°S)对流活动异常的联系。结果表明:热带西北太平洋与东南印度洋对流活动异常的联系有显著的年代际变化; 20世纪80—90年代存在显著的正相关,20世纪90年代至21世纪初有显著的负相关,其后转变为正相关。合成分析表明,热带西北太平洋与东南印度洋对流活动正相关时,两地区均存在反气旋性环流,低层辐散、高层辐合,对流活动弱,不利于降水产生,有降水负异常;当热带西北太平洋与东南印度洋对流活动负相关时,两地区环流异常存在明显差别,热带东南印度洋有正的海温异常,高层辐散、低层辐合,有上升运动,对流活动强,有降水正异常,而热带西北太平洋则相反。热带西北太平洋和热带东南印度洋之间的斜向垂直环流圈将这两个地区联系起来,并决定了这两个地区对流活动负相关关系的形成。
|
| 关 键 词： | 热带西北太平洋 热带东南印度洋 对流活动 年际变化 年代际变化 |
| 收稿时间： | 2018/8/29 0:00:00 |
| 修稿时间： | 2018/11/8 0:00:00 |
Interdecadal change in relations of convective activities in tropical Northwest Pacific and Southeast India Ocean |
| |
| ZHANG Benben,GUAN Zhaoyong and ZHANG Mengmeng.Interdecadal change in relations of convective activities in tropical Northwest Pacific and Southeast India Ocean[J].大气科学学报,2018,41(6):753-761. |
| |
| Authors: | ZHANG Benben GUAN Zhaoyong and ZHANG Mengmeng |
| |
| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China,Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China and Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China |
| |
| Abstract: | Based on the OLR (outgoing longwave radiation) data from NOAA and the NECP/NCAR reanalysis data along with CMAP precipitation data,using composite analysis and other methods,this paper has investigated the interdecadal change in relations of convective activities between the tropical Northwest Pacific(10°-20°N,125°-140°E) and the tropical Southeast India ocean(5°-15°S,90°-105°E).The results demonstrate that there are significant interdecadal variations in relations of convective activities between the tropical Northwest Pacific and the tropical Southeast Indian Ocean,with a significant positive correlation period from 1980s to 1990s,and a significant negative correlation period from 1990s to early twenty-first century,and another positive correlation period after 2004.When the convective activities in the tropical Northwest Pacific and the tropical Southeast Indian Ocean are positively correlated,there are two anti-cyclonic circulations over the two regions,which lead to weak convective activities and negative precipitation anomalies in the two places.When the convective activities in the tropical Northwest Pacific and the tropical Southeast Indian Ocean are negatively correlated,the distinctly different circulation anomalies are observed in the two regions.Accordingly,during the negative correlation period,the positive sea temperature anomalies are found in the tropical Southeast Indian Ocean,where the upper level divergence and lower level convergence facilitate the anomalous strong convection activities and more than normal precipitation.This scenario is opposite in the tropical Northwest Pacific.The slanted vertical circulation between the tropical Northwest Pacific and the tropical Southeast Indian Ocean connects the two regions,which induces the negative correlation between convection activities over the two regions. |
| |
| Keywords: | tropical Northwest Pacific tropical Southeast India Ocean convective activity interannual variation interdecadal change |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《大气科学学报》浏览原始摘要信息 |
| 点击此处可从《大气科学学报》下载免费的PDF全文 |
|
