Warming of the Polar Water Layer in Disko Bay and Potential Impact on Jakobshavn Isbrae
Warming of the Polar Water Layer in Disko Bay and Potential Impact on Jakobshavn Isbrae
复制标题
迪斯科湾极地水层变暖及其对雅各布港的潜在影响
DOI：
10.1175/jpo-d-12-051.1
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发表时间：
2013
影响因子：
3.5
通讯作者：
M. Ribergaard
中科院分区：
文献类型：
--
作者：
P. Myers;M. Ribergaard
最近的一些研究表明，格陵兰岛南部和西部大部分地区的潮汐冰川正在加速退缩。其中最快的一次消退发生在雅各布港，这种快速消退与格陵兰岛西海岸相对温暖和含盐的伊明格水的到来有关。在东海岸也发现了与格陵兰海岸陆架海水团变化的类似联系。本研究利用了迪斯科湾的水文资料，进一步揭示了从20世纪90年代中后期开始，进入迪斯科湾的极地冷水也显著变暖。这一层位于；30 - 200米，温度升高18 - 28摄氏度。1997年后极地水层的热含量比1990年以前增加了3.6倍。在同一时期，西格陵兰岛伊尔明格水层的热量含量仅增加了2倍，但总热量却增加了。作者认为极地水层的变化与巴芬湾环流的变化有关。
A number of recent studies have shown enhanced retreat of tidewater glaciers over much of southern and western Greenland. One of the fastest retreats has occurred at Jakobshavn Isbrae, with the rapid retreat linked to the arrival of relatively warm and saline Irminger water along the west coast of Greenland. Similar links to changes in ocean water masses on the coastal shelf of Greenlandwere also seen on the east coast. This study presents hydrographic data from Disko Bay, additionally revealing that there was also a significant warming of the cold polar water entering Disko Bay from the mid-to-late 1990s onward. This layer, which lies at a depth of ;30‐200m, warmedby 18‐28C. The heat content of the polar water layer increased by a factor of 3.6 for the post-1997 period compared to the period prior to 1990. The heat content in the west Greenland Irminger water layer between the same periods increased only by a factor of 2, but contained more total heat. The authors suggest that the changes in the polar water layer are related to circulation changes in Baffin Bay.