【摘 要】
：
Persistence is an important property of precipitation and its related impacts. However, changes in persistent precip-itation and the possible underlying mechani
【机 构】
：
State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorologic
论文部分内容阅读
Persistence is an important property of precipitation and its related impacts. However, changes in persistent precip-itation and the possible underlying mechanisms in the context of global warming have not yet been discussed in suffi-cient depth. In this study, the changes in persistent precipitation in summer and related atmospheric circulation pat-terns over the middle–lower reaches of the Yangtze River (MLRYZR)—a typical monsoon region frequently hit by consecutive rainfall events—are analyzed based on observed daily precipitation and NCEP/NCAR reanalysis data from 1961 to 2019. The results reveal that persistent precipitation events (PPs) tend to happen in a more persistent way, with increased frequency and intensity in the MLRYZR region. Mechanism analyses show that persistent pre-cipitation has happened along with simultaneous enhancement of some large-scale atmospheric circulation patterns, including the Lake Baikal blocking (BB), the Okhotsk Sea blocking (OB), and the western Pacific subtropical high (WPSH). Such enhanced anomalous circulation patterns could persistently reinforce the convergence and supply of water vapor in the MLRYZR region, contributing to the increase in PPs in this region. Based on the above results, we are able to offer some new insights into the long-term changes in precipitation structure and the possible causes. This study is also expected to support attribution studies on regional precipitation changes in the future.
其他文献
Understanding Pakistan's greenhouse gas(GHG)emission status is critical for identifying the national targets for GHG mitigation with respect to the nationally d
Virtualization is the most important technology in the unified resource layer of cloud computing systems.Static placement and dynamic management are two types o
There is a sharp decline in the network performance when the wireless link fails as a data path in the Wireless Network-on-Chip (WiNoC).To counteract this probl
基于地理信息系统空间分析方法、 Mann-Kendall秩次相关法和景观格局指数分析法,探究2000—2015年景观格局变化对三岔河上游径流量的影响。结果表明:在变化趋势上,1990—2015年间的年降水量与年径流量变化趋势存在一致性,但是年径流量的变化幅度大于年降水量的;在景观水平上,径流量变化与最大斑块面积指数、景观形状指数、聚集度指数呈正相关,而与景观破碎度、 Shannon多样性指数、 S
Snow properties and their changes are crucial to better understanding of hydrological processes,soil thermal regimes,and surface energy balances.Reliable data a
In boreal and arctic regions,forest fires exert great influences on biogeochemical processes,hydrothermal dynamics of the active layer and near-surface permafro
提出空间降维和多核支持向量机算法进行网络入侵检测;从网络中抓取数据包,通过局部线性嵌入数据降维获得属性降维后的数据样本;通过差异化设置参与局部线性嵌入运算的邻居数,验证适合样本集的邻居数,将多项式核函数、高斯核函数和Sigmoid核函数进行两两组合,分别验证多核支持向量机的网络入侵检测性能。结果表明,在合理设置局部线性嵌入邻居数和核函数组合方式的条件下,基于空间降维和多核支持向量机的网络入侵检出率较高,检测时间较短。
Owing to the remoteness of the Longriba area and the lack of dating records,it is extremely challenging to reconstruct the chronology and extent of the paleogla
Local breeding of growing modes(LBGM)is a method used to generate initial condition perturbation(ICP)for convection-permitting ensemble forecasts.Equal weights(EWs)are usually presumed in LBGM during the localization of ICP,without considering different c
Globally,mountains are often characterized as fragile and hazardous terrains,with vast areas covered by the cryosphere.The livelihoods of communities in the Hin