Platelet Ice Under Arctic Pack Ice in Winter

Platelet Ice Under Arctic Pack Ice in Winter
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冬季北极浮冰下的血小板冰

DOI:
10.1029/2020gl088898
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发表时间:
2020
影响因子:
5.2
通讯作者:
Raphael, Ian
Raphael, Ian
中科院分区:
地球科学1区
文献类型:
--
作者:
Katlein, Christian;Mohrholz, Volker;Sheikin, Igor;Itkin, Polona;Divine, Dmitry V.;Stroeve, Julienne;Jutila, Arttu;Krampe, Daniela;Shimanchuk, Egor;Raphael, Ian

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众所周知,片晶冰的形成发生在南极海冰下,其中亚冰片片层由过冷的冰架水形成。然而,在北极,片状冰的形成尚未被广泛观察到,其形成和形态目前仍然是个谜。在这里,我们首次对冬季北极中部自由漂流浮冰下的分米厚的亚冰片层进行了全面的长期原位观测。在 MOSAiC 漂流探险的仲冬期间,使用遥控水下航行器 (ROV) 进行的观测提供了海洋混合层中存在的过冷水中片状冰层生长的明确证据。这种血小板的形成发生在调查期间存在的所有冰类型下。来自自主观测平台的海洋学数据使我们得出这样的结论:片状冰的形成是北极冬季海冰生长的一个普遍但又被忽视的特征。
The formation of platelet ice is well known to occur under Antarctic sea ice, where subice platelet layers form from supercooled ice shelf water. In the Arctic, however, platelet ice formation has not been extensively observed, and its formation and morphology currently remain enigmatic. Here, we present the first comprehensive, long‐term in situ observations of a decimeter thick subice platelet layer under free‐drifting pack ice of the Central Arctic in winter. Observations carried out with a remotely operated underwater vehicle (ROV) during the midwinter leg of the MOSAiC drift expedition provide clear evidence of the growth of platelet ice layers from supercooled water present in the ocean mixed layer. This platelet formation takes place under all ice types present during the surveys. Oceanographic data from autonomous observing platforms lead us to the conclusion that platelet ice formation is a widespread but yet overlooked feature of Arctic winter sea ice growth.
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