Monitoring the Transport of the Antarctic Circumpolar Current at Drake Passage
Monitoring the Transport of the Antarctic Circumpolar Current at Drake Passage
复制标题
监测德雷克海峡南极绕极流的输送
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
T. Whitworth
中科院分区：
文献类型：
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作者：
T. Whitworth
摘要
利用大量的系泊仪器阵列数据和三次海洋水文考察的数据来计算德雷克海峡上层2500米处净输送量的时间序列。通过在海峡两侧配备大量仪器的系泊设备监测斜压地转输送。海峡南北两端的压力计测量提供了500米处的参考速度，以调整相对输送量。截至1980年1月的370天记录中，上层2500米的净输送量平均为1.21×10⁸立方米/秒。通过德雷克海峡整个横截面的总输送量可能在1.18×10⁸到1.46×10⁸立方米/秒之间。相对输送量的波动与海峡中最北部锋面——亚南极锋的纬度变化有关。净输送量的变化与纬向平均东风应力具有一致性。
Abstract Data from an extensive moored instrument array and three hydrographic cruises are used to calculate a time series of the net transport through the upper 2500 m of the Drake Passage. The baroclinic geostrophic transport was monitored with heavily instrumented moorings at each side of the passage. Pressure gauge measurements at the northern and southern ends of the passage provided a reference speed at 500 m to adjust the relative transport. The net transport of the upper 2500 m for the 370-day record ending in January 1980 averaged 121 × 106 m3 s−1. The total transport through the entire cross-sectional area of Drake Passage is probably between 118 and 146 × 106 m3 s−1. Fluctuations in the relative transport are related to changes in latitude of the northernmost front in the passage, the Subantarctic Front. Variability of the net transport is coherent with the zonally averaged eastward wind stress.