Oceanic transport of subpolar climate signals to mid-depth subtropical waters
Oceanic transport of subpolar climate signals to mid-depth subtropical waters
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DOI：
10.1038/35356
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发表时间：
1998-02-05
期刊：
影响因子：
64.8
通讯作者：
Joyce, TM
中科院分区：
文献类型：
--
作者：
Curry, RG;McCartney, MS;Joyce, TM
某些海面特性（如温度）的空间分布在时间尺度上从数月到数十年不等，并与构成全球气候系统的主要区域大气型态同步(1)。尽管长期以来人们一直认为海洋服从于大气的支配，但最近的研究提出了一种可能性，即海洋的作用是主动的，而不仅仅是被动的，在这种作用中，水团循环控制着气候波动的时间尺度（2-6）。以前认为深水团的物理和化学特征不变性的观念正在改变，因为较长时间的海洋测量序列表明，变化的海面条件的特征被转化为深水（4,7）。在这里，我们使用这样的时间序列测量来跟踪在北大西洋亚极地拉布拉多盆地的海面上“印记”到百慕大附近亚热带盆地的深水的信号，并推断出大约6年的传递时间。我们建立了一个地理和时间背景，为过去40年左右报告的亚热带中深水长期变暖趋势的一部分（8,9）。我们预测，在接下来的十年里，这些深度的海水将继续冷却。
The spatial distributions of certain sea-surface properties, such as temperature, fluctuate on timescales from months to decades and in synchrony with the main regional atmospheric patterns comprising the global climate system(1). Although it has long been assumed that the ocean is submissive to the dictates of the atmosphere, recent studies raise the possibility of an assertive, not merely passive, oceanic role in which water-mass circulation controls the timescales of climate fluctuations(2-6). Previously held notions of the immutability of the physical and chemical characteristics of deep water masses are changing as longer time series of ocean measurements indicate that the signatures of varying sea-surface conditions are translated to deep waters(4,7). Here we use such time-series measurements to track signals 'imprinted' at the sea surface in the North Atlantic Ocean's subpolar Labrador Basin into the deep water of the subtropical basins near Bermuda, and infer an approximately 6-year transit time, We establish a geographic and temporal context for a portion of the long-term warming trend reported for mid-depth subtropical waters over the past 40 or so years(8,9), and we predict that waters at these depths will Continue to cool well into the next decade.