Diagnosing links between atmospheric moisture and extreme daily precipitation over the UK
Diagnosing links between atmospheric moisture and extreme daily precipitation over the UK
复制标题
诊断英国大气湿度和极端每日降水之间的联系
DOI：
10.1002/joc.4547
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Allan R
中科院分区：
文献类型：
--
作者：
Allan R
在1997-2008年期间，分析了与影响不列颠群岛地区的每日降雨事件中最重的1%相关的大气湿度特征。一个混合的卫星/雨量计数据集（GPCP-1DD）和区域平均日雨量计观测（HadUKP）与ERA中期再分析相结合。这些与HadGEM 2-A气候模式的模拟进行了比较，该模式应用了观测到的海表温度和现实的辐射强迫。GPCP（32 mm day−1）的已识别事件和地点的极端日降雨量中位数大于HadUKP和模拟（25 mm day−1）。观测和模拟的最大日降雨事件与比湿度和水汽水平输送的增加有关（观测和模拟事件的850 hPa比湿度中值为1.66 g kg− 1，水汽输送中值为1.150 g kg− 1 m s− 1）。极端日降雨事件在春季和夏季的不列颠群岛大部分地区不太常见，但在东南部地区，它们占这几个月内不同极端日降雨事件总数的60%。与冬季事件相比，英国东南部的夏季事件与更大的幅度和更偏南的位置的水分最大值和更少的空间广泛的区域增强水分输送。极端日降雨量对湿度特征的这种对比依赖意味着一系列取决于位置和季节的驱动机制。需要更高的空间和时间分辨率数据来进一步探索这些过程，这对于评估未来降雨量和相关洪水的预测变化至关重要。
Atmospheric moisture characteristics associated with the heaviest 1% of daily rainfall events affecting regions of the British Isles are analysed over the period 1997–2008. A blended satellite/rain‐gauge data set (GPCP‐1DD) and regionally averaged daily rain‐gauge observations (HadUKP) are combined with the ERA Interim reanalysis. These are compared with simulations from the HadGEM2‐A climate model which applied observed sea surface temperature and realistic radiative forcings. Median extreme daily rainfall across the identified events and locations is larger for GPCP (32 mm day−1) than HadUKP and the simulations (∼25 mm day−1). The heaviest observed and simulated daily rainfall events are associated with increased specific humidity and horizontal transport of moisture (median 850 hPa specific humidity of ∼6 g kg−1and vapour transport of ∼150 g kg− 1m s− 1for both observed and simulated events). Extreme daily rainfall events are less common during spring and summer across much of the British Isles, but in the south east region, they contribute up to 60% of the total number of distinct extreme daily rainfall events during these months. Compared to winter events, the summer events over south east Britain are associated with a greater magnitude and more southerly location of moisture maxima and less spatially extensive regions of enhanced moisture transport. This contrasting dependence of extreme daily rainfall on moisture characteristics implies a range of driving mechanisms that depend upon location and season. Higher spatial and temporal resolution data are required to explore these processes further, which is vital in assessing future projected changes in rainfall and associated flooding.
登录
查看更多内容
影响因子：
8
作者：
Dacre, H. F.;Clark, P. A.;Lavers, D. A.
通讯作者：
Lavers, D. A.
1952 年林茅斯洪水重温
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
J. B. Mcginnigle;Sutton Coldfield;D. Wilman
通讯作者：
D. Wilman
欧洲日降水量与大气水汽输送量之间的关系
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
D. Lavers;G. Villarini
通讯作者：
G. Villarini
DOI：
--
发表时间：
1973
期刊：
影响因子：
--
作者：
K. Browning;C. Pardoe
通讯作者：
C. Pardoe
影响因子：
8.9
作者：
Pearson, K. J.;Shaffrey, L. C.;Hodges, K. I.
通讯作者：
Hodges, K. I.