North Atlantic extratropical and subpolar gyre variability during the last 120 years: a gridded dataset of surface temperature, salinity, and density. Part 1: dataset validation and RMS variability

被引:0
作者
Gilles Reverdin
Andrew Ronald Friedman
Léon Chafik
Naomi Penny Holliday
Tanguy Szekely
Héðinn Valdimarsson
Igor Yashayaev
机构
[1] Sorbonne-Université,Institut Pierre Simon Laplace, CNRS/IRD/MNHN (LOCEAN)
[2] University of Edinburgh,School of Geosciences
[3] Stockholm University,Department of Meteorology and Bolin Centre for Climate Research
[4] National Oceanography Centre,undefined
[5] Institut Universitaire Européen de la Mer,undefined
[6] Marine and Freshwater Research Institute,undefined
[7] Bedford Institute of Oceanography,undefined
[8] Fisheries and Oceans Canada,undefined
来源
Ocean Dynamics | 2019年 / 69卷
关键词
Sea surface temperature; Sea surface salinity; Surface density; North Atlantic; Decadal variability;
D O I
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中图分类号
学科分类号
摘要
We present a binned annual product (BINS) of sea surface temperature (SST), sea surface salinity (SSS), and sea surface density (SSD) observations for 1896–2015 of the subpolar North Atlantic between 40° N and 70° N, mostly excluding the shelf areas. The product of bin averages over spatial scales on the order of 200 to 500 km, reproducing most of the interannual variability in different time series covering at least the last three decades or of the along-track ship monitoring. Comparisons with other SSS and SST gridded products available since 1950 suggest that BINS captures the large decadal to multidecadal variability. Comparison with the HadSST3 SST product since 1896 also indicates that the decadal and multidecadal variability is usually well-reproduced, with small differences in long-term trends or in areas with marginal data coverage in either of the two products. Outside of the Labrador Sea and Greenland margins, interannual variability is rather similar in different seasons. Variability at periods longer than 15 years is a large part of the total interannual variability, both for SST and SSS, except possibly in the south-western part of the domain. Variability in SST and SSS increases towards the west, with the contribution of salinity variability to density dominating that of temperature in the western Atlantic, except close to the Gulf Stream and North Atlantic Current in the southwest area. Weaker variability and larger relative temperature contributions to density changes are found in the eastern part of the gyre and south of Iceland.
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页码:385 / 403
页数:18
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