Landfast sea ice in Hudson Bay and James Bay

IF 4.7 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Elementa-Science of the Anthropocene Pub Date : 2022-01-01 DOI:10.1525/elementa.2021.00073

K. Gupta, A. Mukhopadhyay, D. Babb, D. Barber, J. Ehn

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引用次数: 3

Abstract

Through analysis of Canadian Ice Service ice charts, we have characterized the temporal and spatial variability of landfast sea ice (or fast ice) surrounding Hudson Bay and James Bay from 2000 to 2019. Over this 19-year period, we observed contrasting changes in fast-ice persistence between the western and eastern sides of Hudson Bay and James Bay. Fast ice in western Hudson Bay and James Bay trended towards later freeze-up and earlier break-up that resulted in a shortening of the fast-ice season at a rate of 6 days/decade. Contrastingly, eastern Hudson Bay and James Bay showcased relatively earlier freeze-up and delayed break-up, and an overall trend towards a longer fast-ice season at a rate of 8 days/decade. The general trend in air temperature followed a similar spatial pattern to the changing fast-ice persistence; however, the timing of fast-ice break-up did not have a strong relationship with the thawing-degree days during spring. Variations in fast-ice area showed latitudinal and meridional gradients, with greater fast-ice area in eastern Hudson Bay and James Bay compared to the west. Given the overall warming trend in the Arctic, observing areas of decreasing fast-ice persistence is unexpected; however, this study highlights the role of regional factors, such as coastal orientation and bathymetry, in controlling the stability, growth and decay of fast ice.

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哈德逊湾和詹姆斯湾的陆地海冰

通过对加拿大冰局冰图的分析，我们刻画了2000 - 2019年哈德逊湾和詹姆斯湾周围陆地海冰(或快冰)的时空变化特征。在这19年的时间里，我们观察到哈德逊湾和詹姆斯湾东西两侧快速冰持久性的对比变化。哈德逊湾西部和詹姆斯湾的快冰有冻结晚、破裂早的趋势，导致快冰期以每十年6天的速度缩短。相比之下，东部哈德逊湾和詹姆斯湾则表现出相对较早的冻结和较晚的融化，总体趋势是快速冰季更长，每十年8天。气温的总体趋势与速冻持续时间的变化具有相似的空间格局;然而，快冰破裂的时间与春季的解冻天数没有很强的关系。快冰面积的变化呈现纬向和经向梯度，哈德逊湾和詹姆斯湾东部快冰面积大于西部。考虑到北极的整体变暖趋势，观测到速冰持久性下降的地区是出乎意料的;然而，本研究强调了海岸方位和水深等区域因素在控制快冰稳定性、生长和衰减中的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Elementa-Science of the Anthropocene Earth and Planetary Sciences-Atmospheric Science

CiteScore

6.90

自引率

5.10%

发文量

审稿时长

16 weeks

期刊介绍： A new open-access scientific journal, Elementa: Science of the Anthropocene publishes original research reporting on new knowledge of the Earth’s physical, chemical, and biological systems; interactions between human and natural systems; and steps that can be taken to mitigate and adapt to global change. Elementa reports on fundamental advancements in research organized initially into six knowledge domains, embracing the concept that basic knowledge can foster sustainable solutions for society. Elementa is published on an open-access, public-good basis—available freely and immediately to the world.