![]() ![]() Starting with a Foreword, Preface, and Introduction, the GLIMS book gives the rationale for and history of glacier monitoring and satellite data analysis. The global mosaic of glacier changes is documented by quantitative analyses and are placed into a perspective of causative factors. ![]() World experts demonstrate that glaciers are changing in response to the ongoing climatic upheaval in addition to other factors that pertain to the circumstances of individual glaciers. This will be a definitive and technically complete reference for experts and students examining the responses of glaciers to climate change. The GLIMS Book, to be released about the same time as the IPCC's 5th Assessment report on global climate warming, buttresses and adds rich details and authority to the global change community's understanding of climate change impacts on the cryosphere. With 33 chapters and a companion e-supplement, the world's foremost experts in satellite image analysis of glaciers analyze the current state and recent and possible future changes of glaciers across the globe and interpret these findings for policy planners.Ĭlimate change is with us for some time to come, and its impacts are being felt by the world's population. The book is the most definitive, comprehensive product of a global glacier remote sensing consortium, Global Land Ice Measurements from Space (GLIMS, ). Global Land Ice Measurements from Space - Satellite Multispectral Imaging of Glaciers (GLIMS book for short) is the leading state-of-the-art technical and interpretive presentation of satellite image data and analysis of the changing state of the world's glaciers. The paucity of thickness measurements at the outlet glaciers means it is impossible to accurately gauge the mass flux of the icefield and thus give a full estimate of the mass balance.An international team of over 150 experts provide up-to-date satellite imaging and quantitative analysis of the state and dynamics of the glaciers around the world, and they provide an in-depth review of analysis methodologies. Marked acceleration also occurred after 2007 at the front of the San Quintin Glacier, the largest outlet glacier of the NPI. Several other outlet glaciers, including the Benito and HPN1 glaciers, on the isolated western side of the icefield accelerated while thinning between 20. Passive microwave observations indicate that the surface of the accumulation basin of the glacier was wet during this period of rapid motion, suggesting that the fast speed may be a consequence of a rise in sub-glacial water pressure, sourced from melt or rainwater making its way to the glacier bed and reducing basal friction. The terminus of the San Rafael Glacier, on the western side of the NPI sustained a peak calving front speed of 19.7 ± 1.2 m/day for 7 days in the austral fall of 2007. ![]() The first whole icefield composite velocity map is presented. Sub-pixel offset tracking of ASTER image pairs is used to produce glacier displacements over intervals typically ranging from 6 days to 18 months. We find that the NPI is providing at least 0.009 ± 0.0002 mm/yr to ongoing sea level change, in agreement with previous estimates. This volume change is converted to a mass loss of 3.40 ± 0.07 Gt/yr, taking into account density differences above and below the equilibrium line. This is regarded as a lower bound because volume loss due to frontal retreat and sub-aqueous melting is not included. A volumetric change of − 4.06 ± 0.11 km 3/yr is found by summing surface elevation changes over all glaciers in the NPI. Thinning rates have accelerated at lower elevations, while above the Equilibrium Line Altitude (ELA) recent thinning rates are not significantly different from those observed in previous studies. A history of ice elevation change is found by differencing ASTER Digital Elevation Models (DEMs) relative to a void-filled version of the DEM collected by the Shuttle Radar Topography Mission (SRTM) in February 2000. We use a satellite-based survey of glacier surface elevation changes, speeds and surface melt conditions between 20 to quantify mass loss from the Northern Patagonian Icefield (NPI), Chile. ![]()
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