Ocean change around Greenland under a warming climate

Ocean change around Greenland under a warming climate
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气候变暖下格陵兰岛周围的海洋变化

DOI:
10.1007/s00382-014-2373-4
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发表时间:
2014
期刊:
影响因子:
4.6
通讯作者:
Lique C
Lique C
中科院分区:
地球科学2区
文献类型:
--
作者:
Lique C

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利用一个高分辨率的全球气候耦合模式,研究了气候变暖对格陵兰附近海洋的影响。格陵兰岛周围的海洋显示出强烈的变暖,以应对当今大气水平的四倍增加。信号在中间层增强,在格陵兰海区域最强。预测的温度变化是由影响大尺度海洋环流的变化而不是当地大气热强迫的变化驱动的。这里研究的海洋条件提供了与格陵兰海岸周围出口冰川接触的水团的背景。因此,温暖的亚热带起源层的未来变暖可能导致冰盖融化加剧,尽管这种信号可以通过其他影响来缓解,包括表面新鲜层的分层增强。应用一个简单的参数化估计融化率的变化沿着格陵兰岛海岸,我们发现,冰盖融化增加到处响应水团性质的变化,虽然融化率的变化在空间上表现出很大的变化。最大的融化加速度被发现在东海岸之间的弗拉姆海峡和丹麦海峡,参数化应用到今天的条件和观测表明中度融化到现在。这些模型结果警告说,格陵兰冰盖的质量平衡应该在任何地方进行监测,而不仅仅是在目前发生融化的地方。
The impact of climate warming on the ocean near Greenland is investigated with a high resolution coupled global climate model. The ocean around Greenland exhibits a strong warming in response to a four times increase of present-day atmosphericlevels. The signal is intensified in the intermediate layer and regionally strongest in the Greenland Sea. The projected changes in temperature are driven by changes affecting the large-scale ocean circulation rather than changes of the local atmospheric heat forcing. The ocean conditions examined here provide a background for the water masses in contact with the outlet glaciers around the Greenland coast. The future warming of the warm subtropical-origin layer could thus lead to enhanced ice sheet melting, although the signal could be mitigated by other effects, including an enhanced stratification of the surface fresh layer. Applying a simple parameterization to estimate the change in melt rate along the Greenland coast, we find that ice sheet melting increases everywhere in response to the change in water mass properties, although the melt rate changes show large variations in space. The largest melting acceleration is found on the east coast between Fram Strait and Denmark Strait, where both the parameterization applied to present-day conditions and observations suggest moderate melting up to now. These model results caution that the Greenland Ice Sheet mass balance should be monitored everywhere and not only where melting occurs at the moment.
格陵兰岛和南极洲周围预计地下海洋变暖的不同程度
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