Jakobshavn Isbrae Glacial Retreat Casey Horgan and Erin Cowles Project Goals Analyze the retreat of the Jakobshavn Isbrae glacier over at least the last 20 years
Estimate the additional freshwater input to oceans due to retreat Analyze land cover change in areas where glacier has retreated Climate change impact on retreat?
The Glacier Greenland Location Western Greenland near town of Ilulissat Approximate latitude of 70 degrees N Characteristics
Greenlands largest outlet glacier Drains 6.5% of total ice sheet area Fastest flowing glacier in the world
Flow rate doubled between 1997 and 2003 Distinct calving mouth that forms 40 km ice fjord/tongue Widely studied Glacier dynamics
Effects of Climate Change climatechange.umaine.e du Google Earth Data and Images Landsat 5 and 7 Images From 1985, 2001, 2007, 2009, 2011 All images from month of July, with exception of 1985
(Sept) No images available from October 1992 to October 1997 Google Earth Used for reference dataa Ilulisat Climate Record Only goes back to 1988 Preprocessing Subsets with area coverage of 94.8 km E-W by 40.1 km N-S
Classifications Classes Glacier, Fjord Ice, Icebergs, Glacial Pools, Open Water, Barren/Uncovered Land, Vegetative Land Similarities between glacier, ice sheet, fjord ice, and icebergs
Spectral signatures Boundaries Locations Unsupervised and two supervised classifications Highly inaccurate
Simple Random Accuracy Assessment of the Seven Class Supervised Image Digitizing More appropriate and accurate than classifying Land covers digitized Glacier Recently uncovered/barren land Fjord ice/tongue of glacier
Extent of connected ice only Digitizing provided ability to Calculate change in coverage areas of the glacier and ice sheet Measurement of glacier retreat Visual representation of glacier and tongue retreat Amount of land recently uncovered by the retreat Estimate amount of fresh water added to oceans from Jakobshavn retreat
Area Analysis Calculations Did area calculations in ArcMap, using the vector files created when digitizing Had to do unions between image pairs for 1985 and 2001, 1985 and 2007, 1985 and 2009, 1985 and 2011, 2001 and 2007, 2007
and 2009, and finally 2009 and 2011 Then clipped to the area of the glacier and used attribute table to find amount of change Table of Area Calculations
Table of Ice Sheet Area Calculations Jakobshavn Isbrae Changes Retreated by 162.7 square kilometers, which is just over 64 square miles If estimate that the glacier is 1.1 meter thick,
this inputs 167.2 million cubic meters of water. 47.8 square kilometers of subglacial land, the rest is lakes, or part of the ice fjord The subglacial land appears to be rocky with
sparse or no vegetation Vegetation coverage seems to increase as exposure time increases Conclusions Since we have not done a thorough accuracy assessment, we would not use
our information for more detailed projects However, we can conclude that the glacier has retreated significantly from 1985 to the present. In addition, our analysis can be applied to other glaciers around the world to see
how climate change may be impacting their growth or retreat. Questions?
Regional hub events and national conference . Working Papers. Twitter followers, chats etc. EdD and MRes students. International profile and study visits . Professional and academic conference contributions . Articles in academic and professional publications .
Arial Tahoma Wingdings Ocean PowerPoint Presentation Theater Arts and CRE Boal's Work Theatre for Community, Conflict and Dialogue - Michael Rohd Goals of Hope Is Vital Types of Theater CRE Types of Theater CRE Groundrules for Theater CRE in the...
Chapter . 4. Project Processes. ... A project management plan defines the requisite activities and tasks for each project. ... Project management plans achieve a logically related set of management objectives. Assessment data supports good decisions, but it is important...
No, persisting passive movement Otoliths, fluid move at same speed Vestibular system detects active movements changes in rate of motion acceleration heating/cooling fluid perception of body motion ~ Visual Illusions of Movement Self vection perceive you are moving, but not...
Criminal Psychology Chapter 5 Insanity and Competency Talbot Kellogg Community College Insanity Insanity is a legal term. The legal definition may vary from jurisdiction to jurisdiction. An assessment for insanity attempts to evaluate the person's mental state at the time...
Hasil-hasilnya adalah kejadian yang tidak terikat satu sama lain, Daftar hasilnya lengkap. Jadi jumlah probabilitas dari berbagai kejadian adalah 1. ... Sampling Techniques & Sample Size, Presentation Material of Biostatistic, High Institute of Public Health, University of Alexandria. Akhir ...
Ready to download the document? Go ahead and hit continue!