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Surface Salinity Variability in the North Atlantic During Recent Decades

机译：近十年来北大西洋的表层盐度变化

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The sea surface salinity (SSS) variability in the North Atlantic is investigated using numerical model simulations for the last 50 years based on atmospheric forcing variability from Comprehensive Atmosphere Ocean Data Set (COADS) and National Center for Environmental Prediction / National Center for Atmospheric Research (NCEP/NCAR) Reanalysis. The largest interannual and longer term variability occurs in two regions: the Labrador Sea and the North Equatorial Countercurrent (NECC) region. In both regions the seasonality of the surface salinity variability is prominent with the maximum standard deviation occurring in the summer/fall period. In the Labrador Sea the summer SSS anomalies far exceed those of wintertime in amplitude. The interannual SSS variability in the subpolar gyre can be attributed to two factors: excess ice melt and heat flux (i.e. deep mixing) variations. On the other hand, heat flux variability can also lead to meridional overturning changes on decadal time scales such that weak overturning is manifested in fresh surface conditions in the subpolar gyre. The overturning changes also influence the NECC region SSS variability. Moreover, the subpolar freshening events are expected to occur during the negative phase of North Atlantic Oscillation which is associated with a weak wintertime surface heat loss in the subpolar gyre. No excess sea ice melt or precipitation is necessary for the formation of the fresh anomalies, because with the lack of wide-spread deep mixing, the fresh water that would be expected based on climatology, would accumulate at the surface. Thus, the fresh water 'conveyor' in the Atlantic operates via the overturning circulation such that deep mixing inserts fresh water while removing heat from the water column.

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Haekkinen, S.;
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年度 2001
页码 1-40
总页数 40
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Surface properties; Salinity; Mathematical models; Atlantic ocean; Variability; Anomalies; Ocean surface; Periodic variations; Sea ice; Computerized simulation; Heat flux; Standard deviation; Sea surface temperature;

机译：表面特性;盐度;数学模型;大西洋;变异性;异常;海洋表面;周期性变化;海冰;计算机模拟;热通量;标准偏差;海面温度;

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机译：北大西洋东部几个小时到几十年的近地表盐度变化：SPURS地区
2. On the assessment of near-surface global temperature and North Atlantic multi-decadal variability in the ENSEMBLES decadal hindcast [J] . J. Garcia-Serrano, F. J. Doblas-Reyes Climate dynamics . 2012,第7a8期

机译：关于ENSEMBLES年代际后铸物中近地表全球温度和北大西洋多年代际变化的评估
3. Variability of heat and salinity content in the North Atlantic in the last decade [J] . V. O. Ivchenko, N. C.Wells, D. L. Aleynik, Ocean science . 2010,第3期

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4. North Atlantic Wave Climate Variability and the North Atlantic Oscillation Index [C] . P.D. Cotton, P.G. Challenor The Proceedings of the Ninth (1999) International Offshore and Polar Engineering Conference . 1999

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机译：近期北方大西洋冷却趋势大西洋十二多个变异性

Surface Salinity Variability in the North Atlantic During Recent Decades

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