The Average Distribution of Volume Transport and Potential Vorticity with Temperature at Three Sections across the Gulf Stream
The Average Distribution of Volume Transport and Potential Vorticity with Temperature at Three Sections across the Gulf Stream
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墨西哥湾流三断面体积输运和位涡随温度的平均分布
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
T. Rossby
中科院分区：
文献类型：
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作者：
K. Leaman;E. Johns;T. Rossby
利用PEGASUS海流剖面在墨西哥湾流沿着三个位置获得的下游流速和温度的平均横截面，被划分为2.5°C的温度区间，以研究两个南部断面（27°和29°N）和哈特斯角外海（73°W）之间的输运增加与温度的分布。在北纬27°到29°之间，佛罗里达海流在这些断面上的总输送量仅增加了约3 × 106 m3 s−1（3 Sv），但海流却扩大了约50%。到了哈特拉斯角，输送量增加了近三倍，达到93.7 Sv，其中三分之二的增加被包含在19.5°-17.0 ° C（“18°”）的层中，以及比27°N的7°C“静止”温度更冷的水中。层输送，位涡和厚度的横流分布进行了估计。在每一个剖面上，10 × 10−7 m−1 s−1的等值线往往是大气层上相对均匀的层位涡区域与大气层内相对均匀的层位涡区域之间的边界（与温度无关）。
Abstract Average cross sections of downstream velocity and temperature, obtained using PEGASUS current profiles at three locations along the Gulf Stream, have been partitioned into 2.5°C temperature intervals to examine the distribution of transport increase versus temperature between the two southern sections (27° and 29°N) and off Cape Hatters(73°W). Between 27° and 29°N the total transport of the Florida Current over the sections increased only by about 3 × 106 m3 s−1 (3 Sv) but the current broadens by about 50%. By Cape Hatteras, the transport has increased nearly three-fold to 93.7 Sv, of which two-thirds of the increase is contained in the 19.5°–17.0°C (“18°”) layer and in water colder than the 7°C “still” temperature found at 27°N. Cross-stream distributions of layer transport, potential vorticity, and thickness are estimated. At each section, the 10 × 10−7 m−1 s−1 contour tends to be a boundary (independent of temperature) between the region of relatively uniform layer potential vorticity on the a...