Spatial and temporal variations in high turbidity surface water off the Thule region, northwestern Greenland

Spatial and temporal variations in high turbidity surface water off the Thule region, northwestern Greenland
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格陵兰西北部图勒地区高浊度地表水的时空变化

DOI:
10.1016/j.polar.2016.07.003
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发表时间:
2016
期刊:
影响因子:
1.8
通讯作者:
S.
S.
中科院分区:
地球科学4区
文献类型:
--
作者:
Ohashi;Y.;Iida;T. Sugiyama S.;Aoki;S.

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从格陵兰冰盖和冰帽流出的冰川融水在格陵兰海岸外的冰前海洋中形成高浊度的水。虽然高浊度水输出的时间和幅度影响沿海海洋环境,例如,通过对生物生产力的影响,但对这种高浊度水的特性知之甚少。因此,在本文中,我们报告的空间和时间变化的高浊度水关闭图勒地区在格陵兰岛西北部,基于遥感反射率数据在波长为555 nm(Rrs555)。根据高反射率(Rrs555 ≥ 0.0070 sr−1)确定的高浊度区域通常分布在海岸附近,许多出口冰川终止于海洋和陆地。高浊度区的范围具有显著的季节和年际变化,其年最大范围与夏季气温显着相关。假设高浊度区域和夏季温度之间存在线性关系,则在冰川融水排放量增加的影响下,年最大范围增加,这可以从目前和预测的未来变暖趋势中推断出来。
Glacial meltwater discharge from the Greenland ice sheet and ice caps forms high turbidity water in the proglacial ocean off the Greenland coast. Although the timing and magnitude of high turbidity water export affect the coastal marine environment, for example, through impacts on biological productivity, little is known about the characteristics of this high turbidity water. In this paper, we therefore report on the spatial and temporal variations in high turbidity water off the Thule region in northwestern Greenland, based on remote sensing reflectance data at a wavelength of 555 nm (Rrs555). The high turbidity area, identified on the basis of high reflectivity (Rrs555 ≥ 0.0070 sr−1), was generally distributed near the coast, where many outlet glaciers terminate in the ocean and on land. The extent of the high turbidity area exhibited substantial seasonal and interannual variability, and its annual maximum extent was significantly correlated with summer air temperature. Assuming a linear relationship between the high turbidity area and summer temperature, annual maximum extent increases under the influence of increasing glacial meltwater discharge, as can be inferred from present and predicted future warming trends.
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