GULF-STREAM FRONTAL EDDY INFLUENCE ON PRODUCTIVITY OF THE SOUTHEAST UNITED-STATES CONTINENTAL-SHELF
GULF-STREAM FRONTAL EDDY INFLUENCE ON PRODUCTIVITY OF THE SOUTHEAST UNITED-STATES CONTINENTAL-SHELF
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DOI：
10.1029/91jc02450
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发表时间：
1991-12-15
影响因子：
3.6
通讯作者：
ATKINSON, LP
中科院分区：
文献类型：
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作者：
LEE, TN;YODER, JA;ATKINSON, LP
从佛罗里达的迈阿密到北卡罗来纳州的哈特拉斯角，每周周期的曲折和涡旋是墨西哥湾流锋面动力学的持续特征。卫星图像和系泊电流和温度记录揭示了锋面扰动增长和衰减的首选区域的空间模式。由于斜压不稳定性，增长区出现在迈阿密、卡纳维拉尔角和恐怖角外海，衰减区出现在佛罗里达海峡的范围内，位于迈阿密和棕榈海滩之间，北纬30度至32度之间，在此河流接近被称为查尔斯顿隆起的地形特征，北纬33度至哈特拉斯角之间。涡旋衰减区与锋面特征的延长、动量和热量的离岸输送以及营养物的陆上输送有关。新的氮从墨西哥湾流下面的营养层的陆上运输表明，锋面涡作为一个“营养泵”的货架。由于墨西哥湾流输入的新氮通量可以支持7.4 × 10（12）克C yr-1的新产量，或如果所有硝酸盐都被利用，每年约800万吨碳。计算表明，这一潜在新产量的大约70%已经实现，使外大陆架的年新产量为4.3 x 10（12）g C。
Weekly period meanders and eddies are persistent features of Gulf Stream frontal dynamics from Miami, Florida, to Cape Hatteras, North Carolina. Satellite imagery and moored current and temperature records reveal a spatial pattern of preferred regions for growth and decay of frontal disturbances. Growth regions occur off Miami, Cape Canaveral, and Cape Fear due to baroclinic instability, and decay occurs in the confines of the Straits of Florida between Miami and Palm Beach, between 30-degrees and 32-degrees-N where the stream approaches the topographic feature known as the Charleston bump and between 33-degrees-N and Cape Hatteras. Eddy decay regions are associated with elongation of frontal features, offshore transport of momentum and heat, and onshore transport of nutrients. Onshore transport of new nitrogen from the nutrient-bearing strata beneath the Gulf Stream indicates that frontal eddies serve as a "nutrient pump" for the shelf. New nitrogen flux to the shelf due to Gulf Stream input could support new production of 7.4 x 10(12) g C yr-1 or about 8 million tons carbon per year if all nitrate were utilized. Calculations indicate that approximately 70% of this potential new production is realized, yielding an annual new production for the outer shelf of 4.3 x 10(12) g C.