Linear response of the Greenland ice sheet's tidewater glacier terminus positions to climate

Linear response of the Greenland ice sheet's tidewater glacier terminus positions to climate
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格陵兰冰盖潮水冰川终点位置对气候的线性响应

DOI:
10.1017/jog.2021.13
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发表时间:
2021
影响因子:
3.4
通讯作者:
Fahrner D
Fahrner D
中科院分区:
地球科学3区
文献类型:
--
作者:
Fahrner D

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获得知识的冰川(TWG)的边缘演变,固体冰通量和它们对气候的响应在大的时空尺度上提供了宝贵的背景下,未来格陵兰冰盖(GrIS)的变化预测。虽然存在对TWG的全部门响应的研究,但在冰盖范围内的研究才刚刚变得可行。在这里,我们提供了1984-2017年224个年度TWG利润率的数据集(n = 3801),表明在区域尺度上平均,标准化的终点变化是线性的。区域线性撤退的趋势,确定在大多数部门的GrIS开始在20世纪90年代中期,虽然在以往的研究相比,东北部部门已经历了持续的撤退,自20世纪80年代中期。通过协整分析,个别冰川对潜在的气候驱动因素具有不同的敏感性,尽管在全部门范围内,西北部和东南部分别对年海面温度和6 - 7 - 8月气温特别敏感。尽管92%的冰川在GrIS上经历了退缩,但观察到的整个冰盖绝对流量的增加可以通过其中11个TWG的变化来解释。
Gaining knowledge of tidewater glacier (TWG) margin evolution, solid ice flux and their responses to climate over large spatio-temporal scales provides valuable context for the projection of future Greenland ice sheet (GrIS) change. Although studies of sector-wide responses of TWGs exist, studies at an ice-sheet-wide scale have only just become feasible. Here, we present a dataset of 224 annual TWG margins for 1984–2017 (n = 3801), showing that averaged over regional scales, normalised terminus change is linear. Regionally linear retreat trends were identified across most sectors of the GrIS starting in the mid-1990s, although in contrast to previous studies, the northeastern sector is shown to have experienced sustained retreat since the mid-1980s. Through cointegration analyses, individual glaciers are shown to have differing sensitivities to potential climate drivers, though on a sector-wide scale the northwest and southeast are shown to be especially sensitive to annual sea surface temperature and June–July–August air temperature, respectively. Although 92% of the analysed glaciers experience retreat across the GrIS, observed increases in absolute flux for the entire ice sheet can be explained by changes in just 11 of these TWGs.
Helheim、Kangerdlugssuaq 和其他 14 个主要格陵兰出口冰川过去 25 年的冰川动态
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发表时间: 2012
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DOI: 10.34194/geusb-201943-02-02
发表时间: 2019
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DOI: 10.1002/2016jf004133
发表时间: 2017-09-01
影响因子: 3.9
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通讯作者: Krieger, L.
DOI: 10.1029/jb092ib09p09051
发表时间: 1987-08-10
期刊: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS
影响因子: --
作者:
MEIER, MF;POST, A
通讯作者: POST, A