Structure of the Subpolar Gyre in the Australian‐Antarctic Basin Derived From Argo Floats
Structure of the Subpolar Gyre in the Australian‐Antarctic Basin Derived From Argo Floats
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DOI：
10.1029/2019jc015406
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发表时间：
2020-08
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通讯作者：
Kaihe Yamazaki;S. Aoki;K. Shimada;Taiyo Kobayashi;Y. Kitade
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作者：
Kaihe Yamazaki;S. Aoki;K. Shimada;Taiyo Kobayashi;Y. Kitade
揭示南极副极地环流的物理机制，对于了解南极大陆边缘的热量和物质交换过程具有重要意义。在这里，我们展示了过去十年的自主剖面浮标（Argo）数据，揭示了东南极洲季节性冰区的环流结构。介绍了一种利用冰下位置不确定的Argo资料的新方法。我们设计了自动位置插值算法，以遵循等深线，这是一致的环境位涡的轮廓。使用坐标确定良好的数据评价了这种插值的估计误差。新方案恢复了季节性冰区多达40%的剖面。它们在1000 dbar时的轨迹清楚地显示了大陆边缘的水平速度场（见图1）。在澳大利亚-南极海盆中，威尔克斯地和可能的麦克罗伯逊地（普雷斯湾环流）外的副极地环流似乎以南部的西向西ASF和北部的沿着62- 64 S的东向速度最大值为界。沿沿着60- 62 S的向东速度最大值很可能对应于ACC南部锋（Kim和Orsi，2014）。沿沿着62- 64 S的最大速度可能与气候有关
Revealing a physics of the Antarctic subpolar gyre is substantial to understand the exchange processes of heat and materials in the Antarctic continental margin. Here we show autonomous profiling float (Argo) data over the past decade revealed the structure of the circulation in the seasonal ice zone off East Antarctica. A new method is introduced to utilize Argo under ice whose position is not well-determined. We devised automated position interpolation algorithm so as to follow isobaths, which is consistent with the contour of ambient potential vorticity. Estimation error by this interpolation was evaluated using the data whose coordinate are well-determined. The new scheme recovered as much as 40% of profiles in the seasonal ice zone. Their trajectories at 1000dbar clarified the horizontal velocity field of the continental margin(see Figure 1). The subpolar gyres off Wilkes Land and possibly off Mac Robertson Land (Prydz Bay Gyre) seem to be bounded by the westward ASF to the south and the eastward velocity maximum along 62-64S to the north in the Australian-Antarctic Basin. The eastward velocity maximum along 60-62S very likely corresponds to the southern ACC front (Kim and Orsi, 2014). The velocity maximum along 62-64S probably corresponds to the climatological