当前位置: X-MOL 学术Atmosphere › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Regional Characteristics of Long-Term Variability of Summer Precipitation in the Poyang Lake Basin and Possible Links with Large-Scale Circulations
Atmosphere ( IF 2.9 ) Pub Date : 2020-09-25 , DOI: 10.3390/atmos11101033
Hua Zhu , Handan He , Hongxiang Fan , Ligang Xu , Jiahu Jiang , Mingliang Jiang , Yanxue Xu

Understanding the spatiotemporal regime of summer precipitation at local scales plays a key role in regional prevention and mitigation of floods disasters and water resources management. Previous works focused on spatiotemporal characteristics of a region as a whole but left the influence of associated physical factors on sub-regions unexplored. Based on the precipitation data of 77 meteorological stations in the Poyang Lake basin (PYLB) from 1959 to 2013, we have investigated regional characteristics of summer precipitation in the PYLB by integrating the rotated empirical orthogonal function (REOF) analysis with hierarchical clustering algorithm (HCA). Then the long–term variability of summer precipitation in sub-regions of the PYLB and possible links with large–scale circulations was investigated using multiple trend analyses, wavelet analysis and correlation analysis. The results indicate that summer precipitation variations in the PYLB were of very striking regional characteristics. The PYLB was divided into three independent sub-regions based on two leading REOF modes and silhouette coefficient (SC). These sub-regions were located in northern PYLB (sub-region I), central PYLB (sub-region II), and southern PYLB (sub-region III). The summer precipitation in different sub-regions exhibited distinct variation trends and periodicities, which was associated with different factors. All sub-regions show no trends over the whole period 1959–2013, rather they show trends in different periods. Trends per decade in annual summer precipitation in sub-region I and sub-region II were consistent for all periods with different start and end years. The oscillations periods with 2–3 years were found in summer precipitation of all the three sub-regions. Summer precipitation in sub-region I was significantly positively correlated with the previous Indian Ocean Dipole (IOD) event, but negatively correlated with East Asian Summer Monsoon (EASM). While summer precipitation in sub-region II and sub-region III showed weak teleconnections with climate indices. All of the results of this study are conducive to further understand both the regional climate variations in the PYLB and response to circulation patterns variations.

中文翻译:

Po阳湖流域夏季降水长期变化的区域特征及其与大环流的联系

了解地方尺度夏季降水的时空格局在区域性预防和减灾,减灾和水资源管理中发挥着关键作用。先前的工作着眼于整个区域的时空特征,但未探讨相关物理因素对子区域的影响。基于1959年至2013年the阳湖流域(PYLB)77个气象站的降水数据,我们通过结合旋转经验正交函数(REOF)分析和层次聚类算法(HCA)研究了PYLB夏季降水的区域特征)。然后使用多种趋势分析研究了PYLB次区域夏季降水的长期变化以及与大规模环流的可能联系,小波分析和相关分析。结果表明,PYLB夏季降水变化具有明显的区域特征。基于两种领先的REOF模式和轮廓系数(SC),PYLB分为三个独立的子区域。这些次区域位于北部的PYLB(子区域I),中央的PYLB(子区域II)和南部的PYLB(子区域III)。不同分区的夏季降水表现出明显的变化趋势和周期性,这与不同的因素有关。所有分区域在1959年至2013年的整个期间都没有显示任何趋势,而是显示了不同时期的趋势。在第一年和第二年不同的所有时期,第一区域和第二区域的夏季夏季降水每十年的趋势是一致的。在这三个次区域的夏季降水中都发现了2-3年的振荡期。I分区的夏季降水与先前的印度洋偶极子(IOD)事件呈显着正相关,而与东亚夏季风(EASM)则呈负相关。第二分区和第三分区的夏季降水显示与气候指数的遥相关性弱。这项研究的所有结果都有助于进一步了解PYLB中的区域气候变化以及对循环模式变化的响应。第二分区和第三分区的夏季降水显示与气候指数的遥相关性弱。这项研究的所有结果都有助于进一步了解PYLB中的区域气候变化以及对循环模式变化的响应。第二分区和第三分区的夏季降水显示与气候指数的遥相关性弱。这项研究的所有结果都有助于进一步了解PYLB中的区域气候变化以及对循环模式变化的响应。
更新日期:2020-09-25
down
wechat
bug