Studies have quantified the contribution of tropical cyclones (TCs) toward seasonal precipitation, but limited analysis is available on TC contribution toward seasonal streamflow over the southeastern and southcentral (SESC) United States (U.S.). Using an extensive network of hydroclimatic data that consists of 233 TC tracks and daily precipitation and streamflow, we estimate TC contribution toward precipitation and streamflow during the hurricane season over the SESC U.S. We found that TCs account for 12% of seasonal streamflow and 6% of seasonal precipitation over the region. Florida, North Carolina, and Louisiana have the highest fractional occurrence of TC-generated annual maximum precipitation (∼20%–32%) and streamflow (∼15%–27%). We also found the fractional occurrence of TCs associated with peak-over threshold precipitation (streamflow) events ranges from 5% to 8% in coastal regions (10%–20% over FL and 5%–10% over coastal NC). Increased antecedent moisture results in increased TCs contribution to streamflow leading to different land-surface responses for similar hurricane events.

中文翻译：

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热带气旋对美国东南部和中南部季节性降水和水流的贡献

研究已经量化了热带气旋 (TC) 对季节性降水的贡献，但关于 TC 对美国东南部和中南部 (SESC) 季节性流量的贡献的分析有限。使用由 233 条 TC 轨迹和每日降水和流量组成的广泛水文气候数据网络，我们估计了美国 SESC 飓风季节期间 TC 对降水和流量的贡献我们发现 TC 占季节性流量的 12% 和 6%该地区的季节性降水。佛罗里达州、北卡罗来纳州和路易斯安那州的 TC 产生的年最大降水量（~20%~32%）和流量（~15%~27%）的发生率最高。我们还发现，在沿海地区（佛罗里达州 10%–20% 和北卡罗来纳州沿海地区 5%–10%），与峰值阈值降水（溪流）事件相关的 TC 发生率在 5% 到 8% 之间。增加的先行水分导致 TC 对水流的贡献增加，从而导致类似飓风事件的不同地表响应。