Filters: Tags: glaciology (X)23 results (105ms)
This report summarizes the results of velocity measurements ofoutlet glaciers, ice streams, and ice shelves around theAntarctic periphery. For some regions, where suitable imageswere available, the same area was measured repeatedly tovalidate the data or register changes in velocity with time.The results given here are a compendium of published papersand work in progress. The results constitute a data base thatwill be added to and amended as more velocity measurementsbecome available.
These data can be used to replicate the application of MWBMglacier as described in two journal articles: 1) Enhancement of a parsimonious water balance model to simulate surface hydrology in a glacierized watershed (in review), and 2) Hydrologic regime changes in a high-latitude glacierized watershed under future climate conditions (doi:10.3390/w10020128). These simulations provide results from historical and 12 future general circulation model scenarios for the period 1949-2099 to determine the potential effects of climate change on the hydrology and water quality of a snow-dominated mountainous environment. In addition to the inputs and outputs, this Data Release includes summaries of the input and output data...
Thirty-nine types of surficial geologic deposits and residualmaterials of Quaternary age are described and mapped in the greaterDenver area, in part of the Front Range, and in the piedmont andplains east of Denver, Boulder, and Castle Rock. Descriptionsappear in the pamphlet that accompanies the map. Landslidedeposits, colluvium, residuum, alluvium, and other deposits ormaterials are described in terms of predominant grain size, mineralor rock composition (e.g., gypsiferous, calcareous, granitic,andesitic), thickness of deposits, and other physicalcharacteristics. Origins and ages of the deposits and geologichazards related to them are noted. Many lines between geologicunits on our map were placed by generalizing...
Ice divides and drainage basins on the ice caps of Franz Josef Land, Russian High Arctic, defined from Landsat, KFA-1000, and ERS-1 SAR satellite imagery
Distributed energy balance modeling of South Cascade Glacier, Washington and assessment of model uncertainty
We have developed a physically based, distributed surface energy balance model to simulate glacier mass balance under meteorological and climatological forcing. Here we apply the model to estimate summer ablation on South Cascade Glacier, Washington, for the 2004 and 2005 mass balance seasons. To arrive at optimal mass balance simulations, we investigate and quantify model uncertainty associated with selecting from a range of physical parameter values that are not commonly measured in glaciological mass balance field studies. We optimize the performance of the model by varying values for atmospheric transmissivity, the albedo of surrounding topography, precipitation-elevation lapse rate, surface roughness for turbulent...
Glacier fluctuations in the Kenai Fjords, Alaska, U.S.A.: An evaluation of controls on iceberg-calving glaciers
Long-term changes in the acid and salt concentrations of the Greenland Ice Core Project ice core from electrical stratigraphy
From accumulation to discharge: modification of stable isotopes during glacial and post-glacial processes
The USGS Publications Warehouse is a citation clearinghouse provides access to over 120,000 publications written by USGS scientists over the century-plus history of the bureau. Since June 2003, all USGS series publications published after that date are available digitally through the USGS web. Since 2009, all scholarly publications authored by USGS staff including those published outside the USGS (scholarly journals, university presses, etc.) are cataloged with links to original published sources. The USGS Publications Warehouse is managed and operated as part of the USGS Libraries Program. ScienceBase harvests all records nightly from the Publications Warehouse via a web service interface that provides original...