Collaborative Research: Understanding GrIS moulin hydrology and links to ice motion

GSTDTAP

项目编号	1603835
	Collaborative Research: Understanding GrIS moulin hydrology and links to ice motion
	Matthew Covington
主持机构	University of Arkansas
项目开始年	2017
	2017
项目结束日期	2019-12-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	262037(USD)
国家	美国
语种	英语
英文摘要	The Melting of the Greenland ice sheet is not a simple issue of warmer air temperatures melting the surface ice, which then flows into the ocean. Surface meltwater can flow deep into the glacier through natural pipes known as moulins. These subsurface channels not only transmit water to some outlet, where it flows into the ocean, but may also influence the downslope sliding of the glacier toward the ocean. To better understand the controls that govern glacier sliding, the PI?s propose to conduct field and model studies on the Greenland ice sheet. The PI?s will instrument a number of moulins with pressure sensors. Glacier velocity will be measured with GPS sensors. Discharge will be monitored through dye tracing. Simulations will be conducted to integrate the observations with a number of simple ?conduit? models in the hope of providing a better and more comprehensive understanding of the processes that govern glacier sliding. Beyond the training of graduate and undergraduate students, the PIs will work with a journalism student at the University of Arkansas to produce a documentary about their field experience. This collaboration provides a unique opportunity to communicate to the general public. It is thought that increased channelization reduces subglacial water pressure act to buffer the Greenland Ice Sheet (GrIS) against large increases in ice velocity. However, few measurements of water pressure have been made in channelized subglacial drainage systems to test this hypothesis. The PI?s will obtain synoptic supraglacial stream discharge data, moulin water level and ice velocity at two moulin sites along an ice flow line in the Paakitsoq Region of the GrIS. Data will be analyzed, and used to parameterize model experiments, to determine the degree to which: 1) local versus regional inputs of melt water control moulin water levels; 2) changes in effective pressure that occur along ice flow paths affect local relationships between subglacial water pressure and ice velocity.
来源学科分类	Geosciences - Polar Programs
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/70678
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Matthew Covington.Collaborative Research: Understanding GrIS moulin hydrology and links to ice motion.2017.