Long-Term SST Variability on the Northwest Atlantic Continental Shelf and Slope
Long-Term SST Variability on the Northwest Atlantic Continental Shelf and Slope
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DOI：
10.1029/2019gl085455
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发表时间：
2020-01-16
影响因子：
5.2
通讯作者：
Joyce, Terrence M.
中科院分区：
文献类型：
--
作者：
Chen, Zhuomin;Kwon, Young-Oh;Joyce, Terrence M.
利用1982-2018年的观测数据集，研究了西北大西洋大陆架和陆坡长期海表温度（SST）变化的区域相干性、连通性和区域不均匀性。在北卡罗来纳州的哈特拉斯角和加拿大纽芬兰和拉布拉多的奇德利角之间的大陆架和陆坡上，一个季节性的同时大的SST变暖趋势被确定为主导信号。大陆架和斜坡区域的线性趋势分别为0.37 +/- 0.06和0.39 +/- 0.06摄氏度/十年。这些大陆架和陆坡上的季节平均SST时间序列相互一致，并在多个较长的观测数据集（记录可追溯到1900年）中一致。北大西洋陆架和陆坡长期平均时间序列与全流域平均SST之间的一致性意味着1982-2018年期间约三分之二的变暖趋势可能归因于自然气候变率，其余部分归因于包括人为变暖在内的外部强迫变化。
The meridional coherence, connectivity, and regional inhomogeneity in long-term sea surface temperature (SST) variability over the Northwest Atlantic continental shelf and slope from 1982-2018 are investigated using observational data sets. A meridionally concurrent large SST warming trend is identified as the dominant signal over the length of the continental shelf and slope between Cape Hatteras in North Carolina and Cape Chidley, Newfoundland and Labrador, Canada. The linear trends are 0.37 +/- 0.06 and 0.39 +/- 0.06 degrees C/decade for the shelf and slope regions, respectively. These meridionally averaged SST time series over the shelf and slope are consistent with each other and across multiple longer observational data sets with records dating back to 1900. The coherence between the long-term meridionally averaged time series over the shelf and slope and basin-wide averaged SST in the North Atlantic implies approximately two thirds of the warming trend during 1982-2018 may be attributed to natural climate variability and the rest to externally forced change including anthropogenic warming.