Impact of hurricanes on the flux of rainwater and Cape Fear River water dissolved organic carbon to Long Bay, southeastern United States
Impact of hurricanes on the flux of rainwater and Cape Fear River water dissolved organic carbon to Long Bay, southeastern United States
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飓风对流向美国东南部长湾的雨水和开普菲尔河水溶解有机碳的影响
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. Whitehead
中科院分区：
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作者：
G. Avery;R. Kieber;J. Willey;G. Shank;R. Whitehead
确定了在北卡罗莱纳州开普菲尔地区登陆的四场飓风对美国东南海岸长湾的降雨和河水溶解有机碳（DOC）的飓风通量。飓风Fran（1996）和飓风Floyd（1999）后DOC的河流通量分别占DOC到长湾全年河流通量的三分之一和一半。这种DOC的大部分是顽固的，不能用于生物消费。飓风弗洛伊德的高DOC通量是由飓风和随后的洪水相关的极高降水量（超过50厘米）造成的。在飓风弗兰之后观测到较高的河流DOC通量，但在飓风伯莎（1996年）和邦尼（1998年）之后没有观测到。“弗兰”的西风路径沿着开普菲尔河流域向内陆降雨，导致河水流量高，而“邦妮”和“伯莎”的东风路径对开普菲尔河流量的影响最小。4次飓风对长湾总DOC的雨水通量不像河流通量那样剧烈。然而，与难降解的河水DOC不同，雨水DOC是高度不稳定的。本研究中四个飓风的雨水沉积量是平均风暴中DOC沉积量的2-5倍。这意味着在1或2天的时间内沉积到长湾的生物可利用DOC占整个年度预算的3-9%，可能会刺激飓风后的短期二次生产力。
The hurricane flux of rain and river water dissolved organic carbon (DOC) to Long Bay located on the southeastern coast of the United States was determined for four hurricanes that made landfall in the Cape Fear region of North Carolina. Riverine flux of DOC following hurricanes Fran (1996) and Floyd (1999) represented one third and one half of the entire annual river flux of DOC to Long Bay, respectively. The majority of this DOC was recalcitrant and not available for biological consumption. The high flux of DOC from hurricane Floyd resulted from extremely high precipitation amounts (in excess of 50 cm) associated with the hurricane and subsequent flooding. High riverine DOC fluxes were observed following hurricane Fran but not hurricanes Bertha (1996) and Bonnie (1998). The westerly path of Fran deposited rain inland along the Cape Fear River watershed, causing high river flow conditions, while Bonnie and Bertha took an eastern path, resulting in a minimal effect to the Cape Fear River flow rates. The rainwater flux of total DOC to Long Bay from the four hurricanes was not as dramatic as that observed for riverine fluxes. However, unlike river water DOC that is refractory, rainwater DOC is highly labile. Rainwater from the four hurricanes in this study deposited 2–5 times the DOC deposited in an average storm. This represented a flux of 3–9% of the entire annual budget of bioavailable DOC to Long Bay being deposited over a 1 or 2 day period, likely spurring short‐term secondary productivity following the hurricanes.