A late spring surge in the open water of the Antarctic sea ice pack
A late spring surge in the open water of the Antarctic sea ice pack
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南极海冰群开放水域的春末涌动
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
I. Simmonds
中科院分区：
文献类型：
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作者：
A. Watkins;I. Simmonds
本文给出了1978-87年和1987-97年南极海冰开放水域的平均年周期，它们是用平均日数据编制的。开放水域面积的最小值出现在2月中旬，随后稳步增加，直到10月建立一个平台，然后在11月初突然激增，达到4.5 × 106平方公里的峰值。由于南极开放水域浪涌（AOS）发生在一个月左右的时间尺度上，它的时间结构只有在使用日常手段时才能真正清楚。AOS被证明是海冰面积和范围年周期的相对时间的结果。这反映了南极环极槽在海冰边缘的晚春穿越，从而将主导风（Ekman强迫）从西风（偏北）转变为东风（偏南）。
Mean annual cycles of open water area within the Antarctic sea ice pack are presented for 1978–87 and 1987–97, compiled using mean daily data. A minimum of the open water area occurs in mid February, followed by a steady increase until a plateau is established in October, before a sudden surge in early November to a peak of 4.5 × 106 km². As this Antarctic Open water Surge (AOS) occurs on timescales of around one month, its temporal structure only becomes truly clear when using daily means. The AOS is shown to be the result of the relative timings of the sea ice area and extent annual cycles. It is suggested these reflect the late spring crossing of the Antarctic circumpolar trough over the sea ice edge, thus shifting the dominant winds (Ekman forcing) from westerly (northerly) to easterly (southerly).