The Influence of Atlantic Tropical Cyclones on Drought over the Eastern United States (1980–2007)
The Influence of Atlantic Tropical Cyclones on Drought over the Eastern United States (1980–2007)
复制标题
大西洋热带气旋对美国东部干旱的影响（1980-2007）
DOI：
10.1175/jcli-d-12-00244.1
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发表时间：
2013
影响因子：
4.9
通讯作者：
E. Wood
中科院分区：
文献类型：
--
作者：
J. Kam;J. Sheffield;Xing Yuan;E. Wood
摘要为了评估大西洋热带气旋（TC）对美国东部干旱状况的影响，在1980-2007年期间，在北美陆地数据同化系统第2阶段（NLDAS-2）分析的强制下，在美国东部运行了变渗透能力（维克）陆面水文模型，其中包括和不包括TC相关降水。干旱的定义是土壤湿度长期低于百分位阈值。不同持续时间的干旱进行了分析-短期（超过30天）和长期（超过90天）-以及不同的干旱严重程度对应的第10，第15，和第20届土壤水分深度。对于TC，干旱的持续时间较短，空间范围较小。热带气旋对土壤水分干旱的影响是多方面的，主要表现为干旱启动晚、干旱强度减弱和干旱恢复早。在区域尺度上，TC缩短了中重度短期和长期干旱的平均持续时间。
AbstractTo assess the influence of Atlantic tropical cyclones (TCs) on the eastern U.S. drought regime, the Variable Infiltration Capacity (VIC) land surface hydrologic model was run over the eastern United States forced by the North American Land Data Assimilation System phase 2 (NLDAS-2) analysis with and without TC-related precipitation for the period 1980–2007. A drought was defined in terms of soil moisture as a prolonged period below a percentile threshold. Different duration droughts were analyzed—short term (longer than 30 days) and long term (longer than 90 days)—as well as different drought severities corresponding to the 10th, 15th, and 20th percentiles of soil moisture depth. With TCs, droughts are shorter in duration and of a lesser spatial extent. Tropical cyclones variously impact soil moisture droughts via late drought initiation, weakened drought intensity, and early drought recovery. At regional scales, TCs decreased the average duration of moderately severe short-term and long-term drou...