21世纪格陵兰冰川不同的融化季节对海平面变化的影响

发布时间：2018-03-19 20:16

本文选题：海平面变化　切入点：格陵兰冰川　出处：《热带海洋学报》2016年03期 　论文类型：期刊论文

【摘要】：利用三维海洋环流模式(parallel ocean program,POP),探讨典型浓度路径(representative concentration pathway,RCP)情景下21世纪格陵兰冰川不同的融化季节对海平面变化的影响。结果表明:在RCP4.5情景下,当格陵兰冰川以7%×a~(-1)的加速度快速融化时,相比于只在夏半年融化,全年融化会导致动力海平面在北冰洋、北大西洋副极地海域加速上升,而在欧洲西北部和北大西洋副热带海域加速下降;比容海平面在北美沿岸加速上升,热带大西洋和南大西洋副热带海域也有所上升,北冰洋、欧洲西北部和北大西洋副热带则显著下降。格陵兰冰川不同的融化季节对海平面变化影响的不同,主要是由于相比于只在夏半年融化,格陵兰冰川全年融化会造成大量较冷较淡的融冰水被滞留在格陵兰岛南部海域,在冬半年,会导致上层海洋层化加强和大西洋经向翻转流进一步减弱,一方面造成大量海水在北大西洋副极地海域堆积;另一方面导致向北的热盐输运减弱,从而造成了北冰洋、北大西洋副极地和副热带海域东部的热比容海平面显著下降和盐比容海平面加速上升。
[Abstract]:The effects of different melting seasons of Greenland glacier in 21th century on sea level changes under the typical concentration path concentration path (RCP) scenario are investigated by using a 3D ocean circulation model parallel parallel ocean program-POP. The results show that under the RCP4.5 scenario, When Greenland glaciers melt at an acceleration of 7% 脳 a ~ (-1), the year-round melting will lead to an accelerated rise in dynamic sea levels in the Arctic Ocean and in the subpolar waters of the North Atlantic, compared to only half a year in the summer. In northwestern Europe and the North Atlantic subtropical waters, the decline has accelerated; the sea level has accelerated along the North American coast, the tropical Atlantic and the South Atlantic subtropical waters have also increased, and the Arctic Ocean, Northwestern Europe and the North Atlantic subtropics have declined significantly. The effects of the melting seasons of Greenland glaciers on sea level changes are largely due to melting in comparison to only half a year in summer. The melting of Greenland glaciers throughout the year will result in a large amount of colder and lighter melting water being trapped in southern Greenland, and in the winter half a year, it will lead to a strengthening of the upper ocean stratification and further weakening of the transatlantic meridional reversal current. On the one hand, a large amount of sea water accumulates in the subpolar waters of the North Atlantic; on the other hand, it weakens the northward transport of heat and salt, resulting in the Arctic Ocean. In the eastern subpolar and subtropical waters of the North Atlantic Ocean, the sea level decreased significantly and the salt specific sea level increased rapidly.
【作者单位】：国家海洋局南海预报中心;河海大学;
【基金】：国家重点基础研究发展计划(“973”)项目(2013CB430302) 国家自然科学基金(41276018)~~
【分类号】：P731.23;P343.6

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