Characteristics of southern California atmospheric rivers
Characteristics of southern California atmospheric rivers
复制标题
南加州大气河流的特征
DOI：
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发表时间：
2018
影响因子：
3.4
通讯作者：
L. Carvalho
中科院分区：
文献类型：
--
作者：
S. Harris;L. Carvalho
大气河流（AR）是高水汽通量的通道，在天气时间尺度上将水分从低纬度输送到高纬度。在地形多变的地区，由于地形强迫，AR可能导致高强度降水。沿着北美西海岸登陆的 AR 与极端事件有关，包括导致洪水和山体滑坡的事件。在南加州 (SCA)，正确的 AR 预报对于区域水资源和减灾非常重要，并且由于该地区的年降水总量来自每个季节相对较少的风暴，风暴频率和/或强度的任何变化都可能产生严重后果。然而，由于大多数区域 AR 研究都集中在太平洋西北地区，因此关于 SCA AR 的信息很少。我们开发了一种算法，用于识别 1979 年至 2013 年期间在总可降水量再分析场内登陆北美西海岸的 AR。然后根据登陆区域对 AR 进行分类。为了确定和区分影响这些区域的 AR 的特征和空间分布，我们检查了每个登陆区域的各种大气变量的滞后合成。 SCA AR 与登陆前几天向北登陆的 AR 不同，亚洲大陆近海海槽和阿拉斯加高压脊的位置和幅度，以及可能引导 AR 湿气向南的喷流核心的位移和向东延伸。还研究了 AR 登陆与厄尔尼诺/南方涛动 (ENSO)、马登-朱利安涛动 (MJO) 和太平洋/北美遥相关模式 (PNA) 之间的关系。
Atmospheric rivers (ARs) are channels of high water vapor flux that transport moisture from low to higher latitudes on synoptic timescales. In areas of topographical variability, ARs may lead to high-intensity precipitation due to orographic forcing. ARs landfalling along North America’s west coast are linked to extreme events including those leading to flooding and landslides. In southern California (SCA), proper AR forecasting is important for regional water resources as well as hazard mitigation and as the area’s annual precipitation totals occur from relatively few storms per season, any changes to storm frequency and/or intensity may have dramatic consequences. Yet, as most regional AR studies focus on the Pacific Northwest, there is little information about SCA ARs. We develop an algorithm to identify ARs landfalling on North America’s west coast between 1979 and 2013 within total precipitable water reanalysis fields. ARs are then categorized according to landfall region. To determine and differentiate the characteristics and spatial distributions of ARs affecting these areas, we examine lag composites of various atmospheric variables for each landfall region. SCA ARs differ from ARs landfalling farther north in the days prior to landfall with the position and amplitude of a trough offshore from the Asian continent and ridge over Alaska, as well as the displacement and eastward extension of the jet core that potentially guides AR moisture southwards. The relationships between AR landfalls and the El Niño/Southern Oscillation (ENSO), the Madden-Julian Oscillation (MJO), and the Pacific/North American Teleconnection Pattern (PNA) are also investigated.
影响因子：
4.6
作者：
Jinwon Kim;D. Waliser;P. Neiman;B. Guan;Ju-Mee Ryoo;G. Wick
通讯作者：
Jinwon Kim;D. Waliser;P. Neiman;B. Guan;Ju-Mee Ryoo;G. Wick