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At times during the past two million years, glaciers formed in the mountainous part of the Platte River drainage basin. These glaceriers were predominantly valley glaciers, also commonly referred to a s mountain or alpine glaciers. by definition, valley glaciers flow through pre-existing valleys and are bounded by exposed bedrock. the deep valleys and canyons of the map area already existed at the beginning of the Ice Age as a result of regional uplift and subsequent erosion that occured from late Oligocene through Pliocene time. the largest valley glacier in the map area was 45 km long and as much as 600 m thick. During times when Pleistocene glaciers reached their maximum extent, about 10 percent of the mountainous...
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We have dated a boulder field in Zepp, VA using cosmogenic Be-10 exposure dating. Three samples taken from boulders at three elevations in the boulder field (804 m asl, 818 m asl, and 831 m asl) were processed at the Reston Cosmogenic Nuclide (RECON) Lab and measured via accelerator mass spectrometry at the Purdue Rare Isotope Measurement (PRIME) Lab. The results of this work are summarized in the file “Zepp_Exposure_Beryllium10_Odom.csv”. This file contains all relevant sample location data, as well as input variables for exposure age calculations. We employed the CRONUS v.3 exposure age calculator (Balco et al., 2008) to estimate exposure ages for these samples and report exposure ages derived using the LSDn time-dependent...
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Glacial retreat and mountain-permafrost degradation resulting from rising global temperatures have the potential to impact the frequency and magnitude of landslides in glaciated environments. In the Saint Elias Mountains of southeast Alaska, the presence of weak sedimentary and metamorphic rocks and active uplift resulting from the collision of the Yakutat and North American tectonic plates create landslide-prone conditions (Winkler et al., 2000). We used Landsat imagery to create an inventory of large (>0.1 square km) rock avalanches that occurred along the south flank of the Saint Elias Mountains between 1984 and 2019 as a baseline for present and future changes in landslide magnitude and frequency. This data...
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The past decade includes some of the most extensive boreal forest fires in the historical record. Environmental drivers include warming temperatures, changing precipitation patterns, desiccation of thick organic soil layers, and increased ignition frequency from lightning. Wildland fires produce smoke aerosols that can travel thousands of kilometers, before blanketing the surfaces on which they fall, such as the Juneau Icefield of Alaska. This data release presents chemical constituent and physical particulate results from investigations of wildland fire smoke deposits and other atmospheric deposition characteristics stored in layers of ice in the Juneau Icefield of Alaska, USA (Tables 1 and 2). We drilled a series...
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Light-absorbing particles in atmospheric dust deposited on snow cover (dust-on-snow, DOS) diminish albedo and accelerate the timing and rate of snow melt. Identification of these particles and their effects are relevant to snow-radiation modeling and water-resource management. Laboratory-measured reflectance of DOS samples from the San Juan Mountains (USA) were compared with DOS mass loading, particle sizes, iron mineralogy, carbonaceous matter type and content, and chemical compositions. Samples were collected each spring for water years 2011-2016, when individual dust layers had merged into one (all layers merged) at the snow surface. Average reflectance values of the six samples were 0.2153 (sd, 0.0331) across...
map background search result map search result map Data for Dust deposited on snow cover in the San Juan Mountains, Colorado, 2011-2016: Compositional variability bearing on snow-melt effects Using wildland fire tracer molecules to investigate fire frequency and vegetative combustion sources archived in the Juneau Icefield of Alaska Inventory data of rock avalanches in the Saint Elias Mountains of southeast Alaska, derived from Landsat imagery (1984-2019) Hydrogeologic section lines in valleys of the Oneonta area, New York Valley-fill aquifer extent in the Oneonta area, Otsego and Delaware Counties, New York Unconfined and semi-confined aquifer areas in the Oneonta area, Otsego and Delaware Counties, New York Well data from the Oneonta area, Otsego and Delaware Counties, New York Surficial geology of the Oneonta area, Otsego and Delaware Counties, New York Data Release - Pleistocene Glaciation in the Upper Platte River Drainage Basin, Colorado Cosmogenic Be-10 Exposure Data for a Boulder Field in Zepp, VA Cosmogenic Be-10 Exposure Data for a Boulder Field in Zepp, VA Data for Dust deposited on snow cover in the San Juan Mountains, Colorado, 2011-2016: Compositional variability bearing on snow-melt effects Hydrogeologic section lines in valleys of the Oneonta area, New York Unconfined and semi-confined aquifer areas in the Oneonta area, Otsego and Delaware Counties, New York Valley-fill aquifer extent in the Oneonta area, Otsego and Delaware Counties, New York Well data from the Oneonta area, Otsego and Delaware Counties, New York Surficial geology of the Oneonta area, Otsego and Delaware Counties, New York Inventory data of rock avalanches in the Saint Elias Mountains of southeast Alaska, derived from Landsat imagery (1984-2019) Data Release - Pleistocene Glaciation in the Upper Platte River Drainage Basin, Colorado Using wildland fire tracer molecules to investigate fire frequency and vegetative combustion sources archived in the Juneau Icefield of Alaska