Temporal variability of the Atlantic meridional overturning circulation at 26.5°N
Temporal variability of the Atlantic meridional overturning circulation at 26.5°N
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DOI：
10.1126/science.1141304
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发表时间：
2007-08-17
期刊：
影响因子：
56.9
通讯作者：
Bryden, Harry L.
中科院分区：
文献类型：
--
作者：
Cunningham, Stuart A.;Kanzow, Torsten;Bryden, Harry L.
大西洋纬向翻转环流（MOC）的活力被认为是容易受到全球变暖的影响，但其短期的时间变率是未知的，所以从最近气候变化的年代际时间尺度上的稀疏观测推断的变化是不确定的。我们结合联合收割机连续测量的MOC（从2004年开始）使用有目的地设计的跨大西洋快速气候变化阵列的系泊仪器部署沿着26.5度N，墨西哥湾流运输和表层埃克曼运输的时间序列，以量化其年内的变化。全年的平均倾覆量为18.7 +/- 5.6 Sv（范围：4.0至34.9 Sv，其中1 Sv =每秒10（6）立方米的海水流量）。可以用1.5 Sv的分辨率监测翻转的年际变化。
The vigor of Atlantic meridional overturning circulation (MOC) is thought to be vulnerable to global warming, but its short-term temporal variability is unknown so changes inferred from sparse observations on the decadal time scale of recent climate change are uncertain. We combine continuous measurements of the MOC (beginning in 2004) using the purposefully designed transatlantic Rapid Climate Change array of moored instruments deployed along 26.5 degrees N, with time series of Gulf Stream transport and surface-layer Ekman transport to quantify its intra-annual variability. The year-long average overturning is 18.7 +/- 5.6 sverdrups (Sv) (range: 4.0 to 34.9 Sv, where 1 Sv = a flow of ocean water of 10(6) cubic meters per second). Interannual changes in the overturning can be monitored with a resolution of 1.5 Sv.