Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period
Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period
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DOI：
10.3390/rs12172837
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发表时间：
2020-09
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通讯作者：
R. Raj;O. Andersen;J. Johannessen;B. D. Gutknecht;S. Chatterjee;S. Rose;A. Bonaduce;M. Horwath;H. Ranndal;K. Richter;H. Palanisamy;C. Ludwigsen;Laurent Bertino;J. Nilsen;P. Knudsen;A. Hogg;A. Cazenave;J. Benveniste
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作者：
R. Raj;O. Andersen;J. Johannessen;B. D. Gutknecht;S. Chatterjee;S. Rose;A. Bonaduce;M. Horwath;H. Ranndal;K. Richter;H. Palanisamy;C. Ludwigsen;Laurent Bertino;J. Nilsen;P. Knudsen;A. Hogg;A. Cazenave;J. Benveniste
海平面变化是气候变化的重要指标。本文的研究重点是利用处理技术发生重大变化的卫星高度计数据进行北冰洋海平面预算评估；(2) GRACE卫星重力测量海洋质量变化数据；(3)和格网水文数据估算的GRACE/Argo时段（2003-2016）的立体高度。在研究期间，波弗特环流（BG）和北欧海（NS）地区的海平面上升趋势最大。海平面的盐蚀变化主导着BG的区域平均海平面变化趋势，而NS的趋势受盐蚀和海洋质量变化的影响。这两个区域的海平面时间变率呈现出以2009-2011年为中心的显著变化趋势。分析表明，这种转变可以用北极上空大尺度大气环流模式的变化来解释。北极的海平面预算评估发现了超过1.0毫米/年的剩余趋势。这种海平面预算的不封闭性进一步归因于上述三个数据集在北极地区的局限性。
Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the processing techniques; (2) ocean mass change data derived from GRACE satellite gravimetry; (3) and steric height estimated from gridded hydrographic data for the GRACE/Argo time period (2003–2016). The Beaufort Gyre (BG) and the Nordic Seas (NS) regions exhibit the largest positive trend in sea level during the study period. Halosteric sea level change is found to dominate the area averaged sea level trend of BG, while the trend in NS is found to be influenced by halosteric and ocean mass change effects. Temporal variability of sea level in these two regions reveals a significant shift in the trend pattern centered around 2009–2011. Analysis suggests that this shift can be explained by a change in large-scale atmospheric circulation patterns over the Arctic. The sea level budget assessment of the Arctic found a residual trend of more than 1.0 mm/yr. This nonclosure of the sea level budget is further attributed to the limitations of the three above mentioned datasets in the Arctic region.