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首页> 外文期刊>Journal of Physical Oceanography >Variability in Southern Hemisphere Ocean Circulation from the 1980s to the 2000s
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Variability in Southern Hemisphere Ocean Circulation from the 1980s to the 2000s

机译：1980年代至2000年代南半球海洋环流的变化

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Interannual-to-decadal variability of ocean circulation in the Southern Hemisphere was examined using data from the 1980s to the 2000s in a box inverse model to estimate transport across hydrographic sections and three ocean general circulation models (OGCMs). The westerly wind stress over the OGCM Southern Ocean showed a steady increase of 5%-8% decade~(-1). The meridional overturning circulation was quantified by the transport across 30°S. The OGCMs suggested a slight strengthening [from 0.2 ± 1.0 to 0.8 ± 1.3 Sv decade~(-1) (1 Sv = 10~6 m~3 s~(-1))] of the upper meridional cell (Deacon cell) and two OGCMs showed a weakening (-0.8 ± 0.6 and -1.0 ± 0.3 Sv decade~(-1)) of the lower meridional [Antarctic Bottom Water (AABW)] cell, partly explained by contraction of the AABW volume. The box inverse estimates did not contradict these two findings. For Antarctic Circumpolar Current transport, quantified by zonal transport across four key sections, the box inverse model estimated a decrease of 5-21 Sv. Decomposition of the decrease into baroclinic transport by the Subantarctic and Polar Fronts, barotropic transport, and others shows that the decrease is mostly due to barotropic transport and transport carried by the fiow north of the Subantarctic Front and south of the Polar Front. In the OGCMs, the variability of transport across key sections is often correlated with transport carried by a flow south of the Polar Front and with the southern annular mode index. In all models, then, the transport of the Antarctic Circumpolar Current, defined as the transport carried by the fronts, has not decreased significantly over the study period.
机译：在1980年代至2000年代的数据中，以箱形反演模型研究了南半球海洋环流的年际到年代际变化，以估计跨水文剖面的传输和三个海洋总环流模型（OGCM）。 OGCM南大洋上的西风应力显示十年间稳定增长5％-8％（-1）。经30°S的传输量可以确定子午翻转的环流。 OGCM提示上子午线细胞（Deacon电池）略有增强[从0.2±1.0到0.8±1.3 Sv十进制〜（-1）（1 Sv = 10〜6 m〜3 s〜（-1））]和两个OGCM表现出较低子午线[南极底水（AABW）]单元的减弱（-0.8±0.6和-1.0±0.3 Sv十进制〜（-1）），部分原因是AABW体积的收缩。方框逆估计与这两个发现并不矛盾。对于南极环极电流传输，通过跨越四个关键部分的纬向传输进行量化，盒逆模型估计下降了5-21 Sv。下降的分解由亚极和极前锋的斜压运移，正压运移等引起，这表明下降的主要原因是正压运移和由亚极南极锋北部和极地南侧的流所载运。在OGCM中，跨关键部分的运输的可变性通常与极地锋以南的水流所携带的运输以及南部的环状模态指数相关。因此，在所有模型中，南极圆周极电流的传输量（定义为锋面所承载的传输量）在研究期间并未显着下降。

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