Basal melting is an important factor affecting the stability of the ice shelf.The basal channel is formed from uneven melting,which also has an important impact on the stability of the ice shelf.Therefore,it has impor...Basal melting is an important factor affecting the stability of the ice shelf.The basal channel is formed from uneven melting,which also has an important impact on the stability of the ice shelf.Therefore,it has important scientific value to study the basal channel changes.This study combined datasets of Mosaics of Antarctica,Reference Elevation Model of Antarctica(REMA) and Operation Ice Bridge to study the temporal and spatial changes of basal channels at the Getz Ice Shelf in Antarctica.The relationships between the cross-sectional area and width of basal channel and those of its corresponding surface depression were statistically analyzed.Then,the changes of the basal channels of Getz Ice Shelf were derived from the ICESat observations and REMA digital elevation models(DEMs).After a detailed analysis of the factors affecting the basal channel changes,we found that the basal channels of Getz Ice Shelf were mainly concentrated in the eastern of the ice shelf,and most of them belonged to the ocean-sourced basal channel.From 2009 to 2016,the total length of the basal channel has increased by approximately 60 km.Affected by the warm Circumpolar Deep Water(CDW),significant changes in the basal channel occurred in the middle reaches of the Getz Ice Shelf.The change of the basal channels at the edge of the Getz Ice Shelf is significantly weaker than that in its middle and upper reaches.Especially in 2005–2012,the eastward wind on the ocean wind field and the westward wind around the continental shelf caused the invasion and upwelling of CDW.Meanwhile,the continuous warming of deep seawater also caused the deepening of the basal channel.During from 2012 to 2020,the fluctuations of the basal channels seem to be caused by the changes in temperature of CDW.展开更多
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西南极绕极深层水(CircumpolarDeepWater,CDW)是源于南极绕极流的暖水团,也被认为是多特森—盖茨海槽的热源,但对其气候态分布特征了解甚少。本文基于观测分析数据(EN4)、EstimatingtheCirculation&Climate of theOcean(ECCO)和Cope...西南极绕极深层水(CircumpolarDeepWater,CDW)是源于南极绕极流的暖水团,也被认为是多特森—盖茨海槽的热源,但对其气候态分布特征了解甚少。本文基于观测分析数据(EN4)、EstimatingtheCirculation&Climate of theOcean(ECCO)和Copernicus Global (1/12)°Oceanic and Sea Ice(GLORYS12)再分析资料,分析了多特森—盖茨海槽CDW水团夏季(1月)的气候态分布特征。结果表明, CDW上边界深度沿西阿蒙森海海盆纬向断面呈现一定的纬向变化, CDW温度和盐度分别达到1℃和34.7;CDW上边界深度沿多特森—盖茨海槽断面具有一定的变化,相应的CDW温度和盐度分别高于0℃和34.6;对于跨多特森—盖茨海槽断面, CDW温度和盐度存在东西向差异,海槽东侧CDW温度和盐度较高。展开更多
基金The National Natural Science Foundation of China under contract Nos 41941010 and 42006184the Independent Scientific Research Project of the State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing。
文摘Basal melting is an important factor affecting the stability of the ice shelf.The basal channel is formed from uneven melting,which also has an important impact on the stability of the ice shelf.Therefore,it has important scientific value to study the basal channel changes.This study combined datasets of Mosaics of Antarctica,Reference Elevation Model of Antarctica(REMA) and Operation Ice Bridge to study the temporal and spatial changes of basal channels at the Getz Ice Shelf in Antarctica.The relationships between the cross-sectional area and width of basal channel and those of its corresponding surface depression were statistically analyzed.Then,the changes of the basal channels of Getz Ice Shelf were derived from the ICESat observations and REMA digital elevation models(DEMs).After a detailed analysis of the factors affecting the basal channel changes,we found that the basal channels of Getz Ice Shelf were mainly concentrated in the eastern of the ice shelf,and most of them belonged to the ocean-sourced basal channel.From 2009 to 2016,the total length of the basal channel has increased by approximately 60 km.Affected by the warm Circumpolar Deep Water(CDW),significant changes in the basal channel occurred in the middle reaches of the Getz Ice Shelf.The change of the basal channels at the edge of the Getz Ice Shelf is significantly weaker than that in its middle and upper reaches.Especially in 2005–2012,the eastward wind on the ocean wind field and the westward wind around the continental shelf caused the invasion and upwelling of CDW.Meanwhile,the continuous warming of deep seawater also caused the deepening of the basal channel.During from 2012 to 2020,the fluctuations of the basal channels seem to be caused by the changes in temperature of CDW.
文摘西南极绕极深层水(CircumpolarDeepWater,CDW)是源于南极绕极流的暖水团,也被认为是多特森—盖茨海槽的热源,但对其气候态分布特征了解甚少。本文基于观测分析数据(EN4)、EstimatingtheCirculation&Climate of theOcean(ECCO)和Copernicus Global (1/12)°Oceanic and Sea Ice(GLORYS12)再分析资料,分析了多特森—盖茨海槽CDW水团夏季(1月)的气候态分布特征。结果表明, CDW上边界深度沿西阿蒙森海海盆纬向断面呈现一定的纬向变化, CDW温度和盐度分别达到1℃和34.7;CDW上边界深度沿多特森—盖茨海槽断面具有一定的变化,相应的CDW温度和盐度分别高于0℃和34.6;对于跨多特森—盖茨海槽断面, CDW温度和盐度存在东西向差异,海槽东侧CDW温度和盐度较高。
