松岛冰架基底通道和基底融化率的变化

IF 1.4 3区 地球科学 Q3 OCEANOGRAPHY
Mingliang Liu, Zemin Wang, Baojun Zhang, Xiangyu Song, Jiachun An
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引用次数: 0

摘要

近年来,松岛冰架(PIIS)的变薄、断裂和后退速度明显加快。基底通道是基底融化增强的结果,有可能对松岛冰架的稳定性产生重大影响。在这项研究中,我们使用了多种遥感数据,包括陆地卫星、REMA DEM、ICESat-1 和 ICESat-2 卫星测高观测数据以及 IceBridge 机载测量数据,在欧拉框架下研究了松岛冰架 2003 至 2020 年基底通道的时空变化以及 2010 至 2017 年的基底融化率。我们发现,PIIS 的基底通道非常发达,总长度超过 450 公里。大部分基底通道为海洋源基底通道或接地线源基底通道,由冰架下或接地线附近的快速融化引起。隆起的海床阻止了暖水侵入冰架东支,导致该地区的基底融化率较低。相比之下,深海海槽有利于暖海水进入 PIIS 主流和西部支流,导致主流的基底融化率较高,主流和西部支流基底通道上方的地表高程变化更为显著。2015-2016 年的厄尔尼诺事件可能通过调节风场、表层海温和深层海水温度减缓了 PIIS 的基底融化。厄尔尼诺现象驱动的海洋和大气变化可以进一步解释和证实PIIS基底融化的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The variation in basal channels and basal melt rates of Pine Island Ice Shelf

In recent years, there has been a significant acceleration in the thinning, calving and retreat of the Pine Island Ice Shelf (PIIS). The basal channels, results of enhanced basal melting, have the potential to significantly impact the stability of the PIIS. In this study, we used a variety of remote sensing data, including Landsat, REMA DEM, ICESat-1 and ICESat-2 satellite altimetry observations, and IceBridge airborne measurements, to study the spatiotemporal changes in the basal channels from 2003 to 2020 and basal melt rate from 2010 to 2017 of the PIIS under the Eulerian framework. We found that the basal channels are highly developed in the PIIS, with a total length exceeding 450 km. Most of the basal channels are ocean-sourced or groundingline-sourced basal channels, caused by the rapid melting under the ice shelf or near the groundingline. A raised seabed prevented warm water intrusion into the eastern branch of the PIIS, resulting in a lower basal melt rate in that area. In contrast, a deep-sea trough facilitates warm seawater into the mainstream and the western branch of the PIIS, resulting in a higher basal melt rate in the main-stream, and the surface elevation changes above the basal channels of the mainstream and western branch are more significant. The El Niño event in 2015–2016 possibly slowed down the basal melting of the PIIS by modulating wind field, surface sea temperature and depth seawater temperature. Ocean and atmospheric changes were driven by El Niño, which can further explain and confirm the changes in the basal melting of the PIIS.

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来源期刊
Acta Oceanologica Sinica
Acta Oceanologica Sinica 地学-海洋学
CiteScore
2.50
自引率
7.10%
发文量
3884
审稿时长
9 months
期刊介绍: Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.
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