Influence of Seasonal Sea Ice Loss on Arctic Precipitation δ18O: A GCM-Based Analysis of Monthly Data

IF 1.9 4区 地球科学 Q3 ECOLOGY
Wenxuan Song, Zhongfang Liu, Haimao Lan, Xiaohe Huan
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引用次数: 0

Abstract

Rapid Arctic warming and sea ice loss have led to an intensification of the Arctic hydrological cycle, which is characterized by increased local evaporation and precipitation. Stable water isotopes as environmental tracers can provide useful insights into the Arctic hydrological cycle. However, the paucity of isotopic observations in the Arctic has limited our understanding of the hydrological changes. Here, we use an isotope-enabled atmospheric general circulation model (IsoGSM) combined with the Global Network of Isotopes in Precipitation (GNIP) observations to investigate the relationship between sea ice changes and Arctic precipitation d18O (d18Op), and reveal the relative influence of local air temperature and evaporation on Arctic summer and winter d18Op. We find that the Arctic d18Op is negatively correlated with sea ice concentration, but positively with air temperature. Sea ice loss leads to enriched Arctic d18Op through enhanced local evaporation and warming, but the relative importance of these processes varies between seasons. During summer, both local evaporation and warming contribute equally to d18Op changes. In contrast, winter δ18O is predominantly driven by air temperature. This work improves our understanding of how Arctic precipitation isotopes respond to sea ice changes and has implications for the Arctic hydrological cycle and paleotemperature reconstructions.

季节性海冰损失对北极降水 δ18O 的影响:基于 GCM 的月度数据分析
北极迅速变暖和海冰消失导致北极水文循环加剧,其特点是当地蒸发和降水量增加。作为环境示踪剂的稳定水同位素可以为了解北极水文循环提供有用的信息。然而,对北极地区同位素观测的缺乏限制了我们对水文变化的了解。在这里,我们利用同位素大气环流模式(IsoGSM)结合降水同位素全球网络(GNIP)观测,研究了海冰变化与北极降水 d18O(d18Op)之间的关系,并揭示了当地气温和蒸发对北极夏季和冬季 d18Op 的相对影响。海冰的消失通过增强局部蒸发和变暖导致北极 d18Op 的富集,但这些过程的相对重要性在不同季节有所不同。在夏季,局部蒸发和气候变暖对 d18Op 变化的影响相同。相比之下,冬季的δ18O主要由气温驱动。这项研究加深了我们对北极降水同位素如何响应海冰变化的理解,并对北极水文循环和古温度重建产生了影响。
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
Polar Research
Polar Research 地学-地球科学综合
CiteScore
3.20
自引率
5.30%
发文量
22
审稿时长
>12 weeks
期刊介绍: Since 1982, Polar Research has been the international, peer-reviewed journal of the Norwegian Polar Institute, Norway''s central institution for research, environmental monitoring and mapping of the polar regions. Aiming to promote the exchange of scientific knowledge about the Arctic and Antarctic across disciplinary boundaries, Polar Research serves an international community of researchers and managers. As an open-access journal, Polar Research makes its contents freely available to the general public. Original primary research papers comprise the mainstay of Polar Research. Review articles, brief research notes, letters to the editor and book reviews are also included. Special issues are published from time to time. The scope of Polar Research encompasses research in all scientific disciplines relevant to the polar regions. These include, but are not limited to, the subfields of biology, ecology, geology, oceanography, glaciology and atmospheric science. Submissions from the social sciences and those focusing on polar management and policy issues are welcome. Contributions about Antarctica are particularly encouraged.
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