| 南极涛动与西沙夏季气候的关联性 |
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| 引用本文： | 孙立,周顺武,孙阳,陈少健,陈长丘,周海霞.南极涛动与西沙夏季气候的关联性[J].气象科技,2018,46(2):292-298. |
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| 作者姓名： | 孙立 周顺武 孙阳 陈少健 陈长丘 周海霞 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室;海南省三沙市气象局 |
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| 基金项目： | 海南省气象局科研项目（HNQXJS201617）、国家重点研发计划课题（2016YFA0602003）资助 |
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| 摘 要： | 利用近53a(1960—2012年)南海西沙群岛永兴岛气象站的观测资料以及同期的NCEP/NCAR月平均再分析资料,分析了近53a西沙夏季气候变化特征及其与春、夏季南极海平面气压的可能联系,并初步分析了南极涛动(AAO)对西沙夏季气候的影响。结果表明:近53a来西沙夏季平均降水持续减少、气温明显升高、风速显著减弱;降水、气温和风速还表现出准2a的年际变率及7~11a的年代际变率。回归分析和相关分析结果均表明,当春、夏季南极海平面气压偏强(弱)时,西沙夏季降水偏多(少)、气温偏低(高)、风速偏强(弱)、空间分布型类似于负(正)位相的南极涛动(AAO)。春、夏季AAO处于正位相,一方面在年代际尺度上导致东亚夏季风减弱,另一方面在年际尺度上导致印度季风减弱,从而使得西沙夏季降水偏少、气温偏高、风速偏弱。
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| 关 键 词： | 南极涛动 海平面气压 西沙 降水 气温 风速 |
| 收稿时间： | 2017/3/19 0:00:00 |
| 修稿时间： | 2017/12/29 0:00:00 |
Correlation of Antarctic Oscillation and Summer Climate in Xisha |
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| Sun Li,Zhou Shunwu,Sun Yang,Chen Shaojian,Chen Changqiu and Zhou Haixia.Correlation of Antarctic Oscillation and Summer Climate in Xisha[J].Meteorological Science and Technology,2018,46(2):292-298. |
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| Authors: | Sun Li Zhou Shunwu Sun Yang Chen Shaojian Chen Changqiu and Zhou Haixia |
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| Abstract: | Based on the observed data from the Yongxing Island weather station in Xisha Islands of the South China Sea and the NCEP/NCAR reanalysis datasets from 1960 to 2012, the characteristics of summer climate change in Xisha are analyzed, and relationships with the sea level pressure in spring and summer in the Antarctic are discussed. The results show that there was a continuous decline of precipitation and increasing of temperature as well as remarkable weakening of wind velocity during 1960-2012 in Xisha, and meanwhile, there existed apparent inter annual variability of the quasi two year and the decadal variability of 7 to 11 years. The results of regression analysis and correlation analysis demonstrate that the summer precipitation in Xisha was more than normal, the temperature is lower than normal, the wind velocity is more strong than normal when the sea level pressure in boreal summer and spring over the Antarctic is significantly higher than normal, resembling the negative phase of Antarctic Oscillation (AAO), and vice versa. The positive phase of AAO in spring and summer, on the one hand, resulted in the weak East summer monsoon at the interdecadal scale and led to the weak India monsoon at the inter annual scale, on the other hand, inducing the decrease of precipitation and increase of temperature as well as the weakness of wind velocity in summer in Xisha. |
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| Keywords: | Antarctic Oscillation sea level pressure Xisha Islands precipitation temperature wind |
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