Collaborative Research: Solid Earth response of the Patagonian Andes to post-Little Ice Age glacial retreat

合作研究：巴塔哥尼亚安第斯山脉对小冰期后冰川退缩的固体地球响应

基本信息

批准号：
1714614
负责人：
Andrew Wickert
金额：
$ 64.57万
依托单位：
University of Minnesota-Twin Cities
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714614&HistoricalAwards=false
关键词：
Collaborative Research Solid Earth response

项目摘要

The goal of this project is to understand how the Earth responds to a cryospheric mass imbalance ona time scale of centuries in a compact, well-monitored region of Patagonia, a region of complex Neogene ridge subduction and youthful volcanism. The problem of glacial isostatic adjustment (GIA) is an important problem and critical to understanding the viscosity and time-scales of deformation in the upper mantle. The PI team will try to quantify and model the isostatic response to ice and sediment loading and unloading. A primary driver of modern rock uplift beneath and surrounding the Southern Patagonia Icefield (SPI) is interpreted to be ice loss following the peak advances of the Little Ice Age (LIA). Recent geodetic studies reveal remarkably rapid uplift rates (up to 40 mm/yr and averaging ~20 mm/yr around the SPI). These rates are the fastest modern geologic uplift rates; ones that demand a low viscosity mantle. In Patagonia, the presence of a somewhat poorly understood slab window that developed during Late Cenozoic time supports speculation that a low-viscosity zone underlies the region where GIA is veryrapid.This team will explore the causes of high rates and spatial-temporal pattern of the inferred GIA using: (1) a regional broadband seismological array to delineate the crustal and upper mantle structure and viscosity and observe seismicity (currently undefined) along the subducting Austral slab; (2) shipboard reflection seismic data and sediment cores to image and date the young pro- and subglacial sediments deposited in the glacial troughs (now fiord-like lakes) carved by advancing ice with a goal of defining both the geometry of ice and volume of deposited sediment through time; (3) new mapping and dating of the subaerial morainal sequence to define the time-varying spatial geometry of the SPI along its two largest outlet glaciers; and (4) improved geophysical models of glacier and solid earth responses.

该项目的目的是了解地球在一个紧凑的，监视着的巴塔哥尼亚地区（一个复杂的新金元山脊俯冲和年轻火山主义的地区）中，地球如何应对几个世纪的冰冷质量不平衡。冰川等静止调整（GIA）的问题对于理解上地幔变形的粘度和时间尺度是一个重要的问题，并且至关重要。 PI团队将尝试量化和建模对冰和沉积物加载和卸载的等静力响应。在小冰河时代（LIA）的峰值进步之后，现代岩石上下岩石（SPI）下方和周围的现代岩石升高的主要驱动力被解释为冰的损失。最近的大地测量研究表明，升高速率非常快（高达40 mm/yr，SPI周围平均约20 mm/yr）。这些速度是最快的现代地质提升率。需要低粘度地幔的人。在巴塔哥尼亚，在新生代晚期开发的一个有点了解的平板窗口的存在支持猜测，低粘性区是GIA非常贴上的区域。该团队将探索该团队的原因，并使用：（1）使用：（1）区域性的宽带和景象，探索高速公司和时空模式。沿着俯冲板的地震性（目前未定义）；（2）船上反射地震数据和沉积物核心，以形象和日期，以通过推进冰的前进的目标，以定义冰的几何形状，以定义冰的几何形状和沉积物的数量，这些沉积物和沉积物的数量均随着时间的流逝而定，这些冰槽（现为fiord的湖泊）沉积在冰川槽（现为fiord的湖泊（现为fiord的湖泊）中）；（3）沿其两个最大的出口冰川沿着SPI定义时间变化的空间几何形状的新的毛刺序列的新映射和日期；（4）改善了冰川和固体土反应的地球物理模型。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Increasing rate of 21st century volume loss of the Patagonian Icefields measured from proglacial river discharge

根据冰河前河流量测量，巴塔哥尼亚冰原 21 世纪体积损失的速度不断增加

DOI：
10.1017/jog.2023.9
发表时间：
2023
期刊：
Journal of Glaciology
影响因子：
3.4
作者：
Van Wyk de Vries, Maximillian;Romero, Matias;Penprase, Shanti B.;Ng, G.-H. Crystal;Wickert, Andrew D.
通讯作者：
Wickert, Andrew D.

Atypical landslide induces speedup, advance, and long-term slowdown of a tidewater glacier

非典型滑坡导致潮水冰川加速、推进和长期减速

DOI：
10.1130/g49854.1
发表时间：
2022
期刊：
Geology
影响因子：
5.8
作者：
Van Wyk de Vries, Maximillian;Wickert, Andrew D.;MacGregor, Kelly R.;Rada, Camilo;Willis, Michael J.
通讯作者：
Willis, Michael J.

Glacier Image Velocimetry: an open-source toolbox for easy and rapid calculation of high-resolution glacier velocity fields

DOI：
10.5194/tc-15-2115-2021
发表时间：
2021-04-28
期刊：
CRYOSPHERE
影响因子：
5.2
作者：
de Vries, Maximillian Van Wyk;Wickert, Andrew D.
通讯作者：
Wickert, Andrew D.

Physical Limnology and Sediment Dynamics of Lago Argentino, the World's Largest Ice‐Contact Lake

世界上最大的冰湖——阿根廷湖的物理湖泊学和沉积物动力学——接触湖

DOI：
10.1029/2022jf006598
发表时间：
2022
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
0
作者：
Van Wyk de Vries, Maximillian;Ito, Emi;Shapley, Mark;Brignone, Guido;Romero, Matias;Wickert, Andrew D.;Miller, Louis H.;MacGregor, Kelly R.
通讯作者：
MacGregor, Kelly R.

Semi-automated counting of complex varves through image autocorrelation

通过图像自相关对复杂变量进行半自动计数