Variability of Antarctic circumpolar transport and the Southern Annular Mode associated with the Madden‐Julian Oscillation
Variability of Antarctic circumpolar transport and the Southern Annular Mode associated with the Madden‐Julian Oscillation
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DOI：
10.1029/2004gl021666
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发表时间：
2004-12
影响因子：
5.2
通讯作者：
A. Matthews;M. Meredith
中科院分区：
文献类型：
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作者：
A. Matthews;M. Meredith
海洋南极环极地输送和大气南方环模（SAM）在季节内（30-70天）时间尺度上的变化与南部冬季热带大气马登-朱利安振荡（MJO）有关。赤道印度洋山峰出现异常MJO对流后约7天，大气温带响应出现，南纬60°几乎整个纬度圈出现异常地表西风。根据潮汐计和底部压力记录仪的测量，这种模式强烈地投射到 SAM 上，并导致围绕南极洲的向东绕极地输送的加速。全球海洋模型证实了这种海洋响应，该模型显示大气温带响应后 3 天通过德雷克海峡的传输达到最大值。
The variability of oceanic Antarctic circumpolar transport and the atmospheric Southern Annular Mode (SAM) on intraseasonal (30–70‐day) timescales is shown to be related to the tropical atmospheric Madden‐Julian Oscillation (MJO) during southern winter. Approximately 7 days after anomalous MJO convection in the equatorial Indian Ocean peaks, an atmospheric extratropical response is set up with anomalous surface westerlies around almost the entire latitude circle at 60°S. This pattern projects strongly onto the SAM and leads to an acceleration of the eastward circumpolar transport around Antarctica, as measured by tide gauges and bottom pressure recorders. This ocean response is confirmed by a global ocean model, which shows a maximum in the transport through Drake Passage 3 days after the atmospheric extratropical response.