Lucas Almeida, Camille Lique, Nicolas Kolodziejczyk, Damien Desbruyères
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引用次数: 0
摘要
北欧海是大西洋经向翻转环流的组成部分,也是全球气候的关键区域。在这项研究中,我们结合观测产品,主要来自Argo阵列,研究了2005年至2020年影响北欧海不同地区海洋条件的变化。2013年以来,各区域等平流层表面均出现明显增温和变深,导致σ0 <以上表层体积增大;27.8 kg m−3。建立了三个等压层的体积预算,以解开导致局部水团转变和大尺度平流的大气强迫所起的相对作用。东部盆地在2012年以后,大西洋平流和地表水质量转化的增加导致了表层的扩张。相比之下,在格陵兰海发现的变化主要是由于运输辐合的减少和使该地区各层通风的地表强迫的变化。我们的分析还强调,需要改进该地区的采样,包括向更深的深度和东格陵兰大陆架取样,以减少北欧海水团转化预算的不确定性,并更好地理解其中的机制。
Drivers of Water Mass Volume Changes in the Nordic Seas (2005–2020)
The Nordic Seas are integral parts of the Atlantic meridional overturning circulation and a key region for the global climate. In this study, we combine observational products, largely derived from the Argo array, to examine the changes affecting ocean conditions in the different regions of the Nordic Seas from 2005 to 2020. Significant warming and deepening of isopycnal surfaces have been found across all regions since 2013, resulting in a volume increase of the surface layer above the σ0 < 27.8 kg m−3 isopycnal. A volume budget over three isopycnal layers is built to disentangle the relative roles played by the atmospheric forcing that results in local water mass transformation and large-scale advection. In eastern basins, an increase in both the advection of Atlantic water and surface water mass transformation led to an expansion of the surface layer after 2012. In contrast, changes found in the Greenland Sea result primarily from a decrease in transport convergence and changes in the surface forcing that ventilates all layers of the region. Our analysis also highlights that an improved sampling of the region, including toward greater depths and on the East Greenland shelves, is required to reduce uncertainties in the water mass transformation budget of the Nordic Seas and to better understand the mechanisms at play.