刘宇迪,
国防科技大学气象海洋学院, 南京 211101
基金项目: 国家自然科学基金（41175089）资助
详细信息
作者简介: 朱金双, 男, 1993年生, 硕士研究生, 主要从事大气动力学与数值模拟研究.E-mail:jshuang.z@foxmail.com
通讯作者: 刘宇迪, 男, 1971年生, 副教授, 博士生导师, 主要从事大气动力学与数值模拟研究.E-mail:udy.liu@pku.edu.cn
中图分类号: P433收稿日期:2017-02-28
修回日期:2017-06-08
上线日期:2018-01-05
Statistical characteristics of ITCZ precipitation in the central-eastern Pacific and its correlation with El Ni?o
ZHU JinShuang,LIU YuDi,
Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
More Information
Corresponding author: LIU YuDi,E-mail:udy.liu@pku.edu.cn
MSC: P433--> Received Date: 28 February 2017
Revised Date: 08 June 2017
Available Online: 05 January 2018
摘要
摘要:利用GPCP（Global Precipitation Climatology Project）与CMAP（CPC Merged Analysis of Precipitation）降水资料以及欧洲天气预报中心月平均SST（Sea Surface Temperature）资料，统计分析了中东太平洋热带辐合带（Centre and Eastern Pacific ITCZ，CEP-ITCZ）降水在两类厄尔尼诺年的基本特征及其与两类厄尔尼诺的相关性.结果表明：在普通年份，CEP-ITCZ平均位置约为7.6°N，强度7.25 mm/day，东部型厄尔尼诺年位置偏南约2.9°，强度增强1.9 mm/day；而中部型厄尔尼诺年位置偏南仅有0.2°，强度增强1.7 mm/day.不同Ni?o海区对CEP-ITCZ位置与强度的影响具有显著差异，与CEP-ITCZ位置相关性最大的海区为超前一个月的Ni?o 3海区，而与CEP-ITCZ强度相关性最大的海区则为超前一个月的Ni?o 3.4（8月-次年2月）或Ni?o 4（3-7月）海区，影响CEP-ITCZ位置的海区主要为东太平洋，影响CEP-ITCZ强度的海区则为中太平洋.此外，CEP-ITCZ位置和强度的异常对SST异常的敏感性均在4月份达到最强，11月份达到最弱.
关键词: 中东太平洋/
热带辐合带(ITCZ)/
厄尔尼诺
Abstract:This study was based on the monthly mean precipitation data from the Global Precipitation Climatology Project (GPCP) and CPC Merged Analysis of Precipitation (CMAP) and monthly mean sea surface temperature (SST) data from the European Centre for Medium-Range Weather Forecasts (ECMWF). The purpose was to investigate the characteristics of ITCZ precipitation in the central-eastern Pacific as well as its correlation with two types of El Ni?o. The results show that the latitude where the central-eastern Pacific ITCZ (CEP-ITCZ) exists is 7.6°N with intensity 7.25 mm/day during usual years. By contrast, the CEP-ITCZ is located farther south by about 2.9° (0.2°) with intensity stronger by about 1.9 mm/day (1.7 mm/day) during the eastern (central) Pacific El Ni?o. The discrepancies of the CEP-ITCZ anomalies between two types of El Ni?o events can be attributed to sea areas, which can influence the position or the intensity of CEP-ITCZ, respectively. There is relatively strong correlation between the CEP-ITCZ position and the SST anomaly in the Ni?o 3 area ahead of one month, while the intensity anomaly of the CEP-ITCZ from March to July (from August to next February) closely correlates with the SST anomaly in the Ni?o 4 (Ni?o 3.4) area ahead of one month. The area with major effects on the position (intensity) of the CEP-ITCZ tends to lie in the eastern (central) Pacific. Both the position and intensity of the CEP-ITCZ are the most (least) sensitive to the SST anomaly in the corresponding Ni?o area in April (November).
Key words:Central-Eastern Pacific/
Intertropical Convergence Zone (ITCZ)/
El Ni?o
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