湖南省夏季極端降水異常時空特征及其成因分析

doi:10.3969/2018jms.0062

首頁 > 過刊瀏覽>2018年第38卷第6期 >838-848. DOI:10.3969/2018jms.0062

湖南省夏季極端降水異常時空特征及其成因分析
DOI:
                        10.3969/2018jms.0062
                    
CSTR:
                        
                    
作者:
                        
                        
                    
作者單位:
作者簡介:
通訊作者:
中圖分類號:
基金項目:中國氣象局預(yù)報員專項（CMAYBY2019-078）；湖南省氣象局預(yù)報員專項（XQKJ18C011）；湖南省氣象局重點項目（XQKJ18A001）

Characteristics of summer extreme precipitation anomaly and the cause of concurrent anomaly pattern in Hunan province

Author:

Affiliation:

Fund Project:

摘要

圖/表

訪問統(tǒng)計

參考文獻

相似文獻

引證文獻

資源附件

文章評論

摘要:

利用湖南省88站常規(guī)觀測資料、NCEP全球再分析資料，采用EOF分解和合成分析方法研究了湖南省1961-2014年極端降水的年際變化異常和時空特征，以及極端降水異常的環(huán)流成因。并主要分析了由EOF方法分析得出的第一類極端降水形態(tài)（一致偏多或偏少型）與環(huán)流異常之間的聯(lián)系。結(jié)果表明，湖南省夏季極端降水分布有較大的空間差異，且湖南省極端降水呈明顯增強的趨勢。由于極端降水的變化周期與大尺度環(huán)流固有的2~4 a周期相同，因此大尺度環(huán)流的變化是湖南省極端降水異常的主要成因。大尺度環(huán)流的變異引起中國東部經(jīng)向排列的環(huán)流異常分布，使得高度場和風(fēng)場等氣候場產(chǎn)生變異，從而引起湖南省極端降水的異常。從極端降水偏多年與偏少年大氣環(huán)流的差值場可以看出：湖南省處于顯著差異區(qū)，湖南省極端降水偏多（偏少）主要是由于北方的偏北風(fēng)加強（減弱）和經(jīng)西太平洋-南海進入湖南地區(qū)的西南風(fēng)加強（減弱）并在湖南地區(qū)產(chǎn)生輻合（輻散）。當(dāng)夏季東亞副熱帶西風(fēng)急流偏南時，湖南正處在偏南較強西風(fēng)急流的南側(cè)，較強西風(fēng)急流所產(chǎn)生的抽吸現(xiàn)象使得上層空氣輻散，增加了湖南省極端降水的強度。副熱帶高壓強度偏強、位置偏南、偏西，使得東亞夏季風(fēng)偏弱，導(dǎo)致氣流輻合穩(wěn)定在湖南省，造成極端降水偏強。前冬中東太平洋海溫偏暖（EI Niño）/偏冷（La Niña），湖南地區(qū)的極端降水容易一致偏多/偏少。同時黑潮暖流區(qū)也是影響湖南極端降水變化的可能原因。

Abstract:

Based on the convective observational data from 88 stations in Hunan province and NCEP/NCAR dataset, by using EOF decomposition and composite analysis, the characteristics and the cause of extreme precipitation anomaly in Hunan province were analyzed. The relationship between the EOF1 of anomaly extreme precipitation (concurrent rich/seldom rainfall pattern) and the large circulation were studied. The results show that, a large difference of spatial-extreme precipitation and extreme precipitation in Hunan has significantly increased. Due to the cycle of extreme precipitation are similar to the cycle of large circulation (2-4 years), the change of circulation may be the inherent reason for the anomaly of extreme precipitation. The variation of large-circulation make the meridional circulation anomaly distribution in eastern China, then the geopotential height and the wind fields changed in future, which causes the change of extreme precipitation in Hunan province. The change of circulation between more extreme precipitation and less extreme precipitation can be seen that, Hunan province located in the significant difference areas. More (less) extreme precipitation in Hunan province are mainly due to the strengthening (weakening) of northly and southly convergence (divergence) in Hunan province. When the location of East Asia subtropical westerly jet is southward, the extreme precipitation in Hunan province will be strengthened, as Hunan province is located the north of East Asia subtropical westerly jet, the strong East Asia subtropical westerly jet cause the upper air divergence. When the intensity of subtropical anticyclone is strong, the location is south-westward, The EASM will be weakened and the convergence is located in Hunan province, the extreme precipitation are enhanced. The pre-winter SST of mid-east Pacific is warmer (cooler), the extreme precipitation in Hunan province is concurrently rich(seldom). Meanwhile, the Kuroshio current region is another possible reason for the change of extreme precipitation in Hunan province.

參考文獻

相似文獻

引證文獻

引用本文

周莉,胡瑞卿,李偉,蔡榮輝,蘭明才.湖南省夏季極端降水異常時空特征及其成因分析.氣象科學(xué),2018,38(6):838-848 ZHOU Li, HU Ruiqing, LI Wei, CAI Ronghui, LAN Mingcai. Characteristics of summer extreme precipitation anomaly and the cause of concurrent anomaly pattern in Hunan province. Journal of the Meteorological Sciences,2018,38(6):838-848

復(fù)制

文章指標(biāo)

點擊次數(shù):
下載次數(shù):
HTML閱讀次數(shù):
引用次數(shù):

歷史

收稿日期:2017-01-06
最后修改日期:2018-01-20
錄用日期:
在線發(fā)布日期: 2019-01-30
出版日期:

文章二維碼

您是第位訪問者
氣象科學(xué) ® 2026 版權(quán)所有
技術(shù)支持：北京勤云科技發(fā)展有限公司

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關(guān)視頻

文章指標(biāo)

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒 激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说

引用本文

分享

相關(guān)視頻

文章指標(biāo)

歷史

文章二維碼

抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说