热带海温的时空变化及其与我国降水的关系
Spatiotemporal Variation of Tropical SST and Its Relationship with Precipitation in China
洛桑旺姆 1达琼 1赤桑单吉 1拉珍1
作者信息
- 1. 西藏自治区山南市气象局,西藏山南 856100
- 折叠
摘要
利用1979-2014年的NOAA/NASA海表温度延长重构数据和国家台站的观测数据,采用经验正交函数(EOF)方法,从赤道年平均海温出发,分析热带海温的时空变化特征以及印度洋-太平洋海温对我国年降水量的影响.结果表明,1979-2014年热带地区年平均海温为26 ℃,海温暖区主要集中在印度洋和西太平洋的赤道地区.热带海温距平时空变化特征:第1特征向量场在印度洋海温表现为全区一致型,太平洋海温表现为弱El Ni(n)o(La Ni(n)a)现象,时间系数与年降水量主要在新疆、西藏、青海、甘肃和河套地区为显著的正相关关系;第2特征向量场在太平洋海温表现为El Ni(n)o(La Ni(n)a)现象,印度洋海温表现为偶极子型,时间系数与年降水量在西藏和黄河中游地区为显著的正相关关系,在东北东部和长江以南地区为显著的负相关关系;第3特征向量场在太平洋海温表现为弱El Ni(n)o(La Ni(n)a)现象,印度洋海温表现为南北型,时间系数与年降水量在西藏、新疆、福建和东北西北部为显著的负相关关系.
Abstract
Using the NOAA / NASA sea surface temperature extension reconstruction data and the national station observation data from 1979 to 2014,starting from the annual average sea surface temperature(SST) of equator,the temporal and spatial characteristics of tropical SST and the effect of Indian Ocean-Pacific SST on the annual precipitation in China were analyzed by the empirical orthogonal function (EOF) method.The results showed that the annual average SST in the tropical region was 26 ℃ from 1979 to 2014,and the warm zone of SST was mainly concentrated in the equatorial region of the Indian Ocean and the western Pacific.The tropical SST anomalies were characterized by the fact that the first eigenvector field was consistent with the same area in the Indian Ocean SST,and the Pacific SST was weak El Ni(n)o (La Ni(n)a).The time coefficient and the annual precipitation were mainly positive correlation in Xinjiang,Tibet,Qinghai,Gansu and Hetao area.The second eigenvector field was El Ni(n)o (La Ni(n)a) in the Pacific SST,and the Indian Ocean SST was characterized by dipole type.There was a significant positive correlation between time coefficient and annual precipitation in Tibet and the middle reaches of the Yellow River,and significant negative correlation between the eastern part of the Northeast and the south of the Yangtze River.The third eigenvector field was weak El Ni(n)o (La Ni(n)a) in the Pacific SST,and the Indian Ocean SST was the north-south type,there was significant negative correlations between time coefficient and annual precipitation in Tibet,Xinjiang,Fujian and the northwest part of the northeast.
关键词
热带海温/时空变化/降水/偶极子/厄尔尼诺Key words
Tropical SST/Spatiotemporal variation/Precipitation/Dipole/El Ni(n)o引用本文复制引用
出版年
2017
国家科技期刊平台
NSTL
维普
万方数据