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Filters Date Range Past year (1) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts Courtney A Creamer U.S. Geological Survey - ScienceBase Geosciences and Environmental Change Science Center U.S. Geological Survey Ecosystems More... Tag Types Theme (8) USGS Scientific Topic Keyword (7) Place (5) Harvest Set (8) Tag Schemes None (4) Common geographic areas (3) USGS Thesaurus (3) ISO 19115 Topic Category (7) USGS Thesaurus, USGS Biocomplexity Thesaurus, Agricultural Library Thesaurus (1) NONE (1) Methodology (2) View Results as: JSON ATOM CSV

U.S. Geological Survey Soil Sample Archive The U.S. Geological Survey (USGS) Soil Sample Archive is a database of information describing soil and sediment samples collected in support of USGS science. Samples in the archive have been registered with International Generic Sample Numbers, relabeled with bar-coded sample labels, and repacked in containers for long-term preservation. Details of sample collection location, collection date, associated datasets, mass of remaining sample, storage locations, and other relevant information are tabulated here so that interested parties may identify associated datasets and search, sort, and gain access to archived samples. Categories: Data; Tags: Ecology, Environmental Health, Geochemistry, Geomorphology, Hydrology, All tags... Soil Sciences, USGS Science Data Catalog (SDC), geoscientificInformation, sample repositories, soil horizons, soil resources, soil sciences, Fewer tags Batch sorption data, respired CO2, extractable DOC, and Raman spectra collected from an incubation with microbial necromass on feldspar or amorphous aluminum hydroxide (COPY) These datasets are from an incubation experiment with a combination of two minerals (feldspar or amorphous aluminum hydroxide), one living species of bacteria (Escherichia coli), and one added form of C (Arthrobacter crystallopoietes necromass). We characterized the sorptive properties of the minerals with batch sorption experiments using four low molecular weight C substrates (glucose, oxalic acid, glutamic acid, p-hydroxybenzoic acid): this data is provided in the SterileSorptionData file. We then conducted a 3-wk long incubation in serum vials or imaging chambers. In both incubations, feldspar (200 mg) or amorphous aluminum hydroxide (100 mg) was given 1 of 4 different treatments: (1) a water control with autoclaved... Categories: Data; Tags: Mineralogy, Raman spectroscopy, Soil Sciences, USGS Science Data Catalog (SDC), biota, All tags... carbon cycling, carbon isotope analysis, environment, mineralogy, sorption, Fewer tags Data from a reactive transport modeling study of cave seepage water chemistry Karst systems are useful for examining spatial and temporal variability in Critical Zone processes because they provide a window into the subsurface where waters have interacted with vegetation, soils, regolith, and bedrock across a range of length and time scales. The majority of Critical Zone research has emphasized silicate lithologies, which are typified by relatively slow rates of reactivity and incongruent weathering. However, weathering of carbonate dominated lithology can result in secondary mineral deposits, such as speleothems, which provide a long-term archive for Critical Zone processes. Examination of carbon isotope variability in speleothems has the potential to provide records of changes in vegetation,... Categories: Data; Tags: Blue Springs Cave, Tennessee, USGS Science Data Catalog (SDC), White County, carbon, All tags... cave, elemental chemistry, geoscientificInformation, isotopes, karst, none, radiocarbon, soil, trace elements, Fewer tags Soil Biogeochemical Data from a Marine Terrace Soil Climo-Chronosequence Comparison The storage and persistence of soil organic matter (SOM) is of critical importance to soil health, and to the terrestrial carbon cycle with implications for long-term climate change. To better understand the spatio-temporal controls on SOM, we have developed a new dataset spanning two previously described marine terrace soil chronosequences from northern, CA, USA: the Santa Cruz and the Mattole River chronosequences. Each of these sites, is comprised of several terraces surfaces that span at least 200 ka of soil development. The sites differ with regard to local precipitation, with the Mattole site receiving nearly double the mean annual precipitation of the Santa Cruz site. During the period from 2011 through 2016,... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: California, Geochemistry, Land Use Change, Land Use Change, Petrolia, All tags... Santa Cruz, Soil Sciences, Soil Sciences, USGS Science Data Catalog (SDC), carbon, elemental chemistry, geoscientificInformation, mineralogy, radiocarbon, soil, surface area, Fewer tags Abiotic sorption of glucose, glutamic acid, hydroxybenzoic acid, and oxalic acid onto amorphous aluminum hydroxide, feldspar, ferrihydrite, and kaolinite Abiotic sorption experiments were conducted with four carbon substrates (glucose, glutamic acid, oxalic acid, para-hydroxybenzoic acid) on four clay minerals (kaolinite, feldspar, ferrihydrite, amorphous aluminum hydroxide) after sterilization by gamma irradiation. The adsorption isotherms were carried across a range of substrate carbon concentrations (0, 20, 100, and 500 mg carbon per L) and pH conditions (approximately 5 – 9) in a background of 10 mM NaCl for 48 hours. The data release contains measured pH values and carbon concentrations before and after the sorption experiments. The release provides derived values of carbon sorption (e.g., carbon sorbed per mineral surface area) as well as characterization of... Categories: Data; Tags: Soil Sciences, USGS Science Data Catalog (SDC), environment, mineral, soil, All tags... world, Fewer tags Batch sorption data, respired CO2, extractable DOC, and Raman spectra collected from an incubation with microbial necromass on feldspar or amorphous aluminum hydroxide These datasets are from an incubation experiment with a combination of two minerals (feldspar or amorphous aluminum hydroxide), one living species of bacteria (Escherichia coli), and one added form of C (Arthrobacter crystallopoietes necromass). We characterized the sorptive properties of the minerals with batch sorption experiments using four low molecular weight C substrates (glucose, oxalic acid, glutamic acid, p-hydroxybenzoic acid): this data is provided in the SterileSorptionData file. We then conducted a 3-wk long incubation in serum vials or imaging chambers. In both incubations, feldspar (200 mg) or amorphous aluminum hydroxide (100 mg) was given 1 of 4 different treatments: (1) a water control with autoclaved... Categories: Data; Tags: Mineralogy, Raman spectroscopy, Soil Sciences, USGS Science Data Catalog (SDC), biota, All tags... carbon cycling, carbon isotope analysis, environment, mineralogy, sorption, Fewer tags Data from a sequential selective dissolution method to quantify storage and stability of organic carbon associated with Al and Fe hydroxide phases Stabilization of SOM (soil organic matter) is regulated in part by sorption and desorption reactions happening at mineral surfaces, as well as precipitation and dissolution of organo-metal complexes. Fe and Al hydroxides play a particularly significant role in SOM stabilization in soils due to their ubiquitous distribution and their highly reactive surface properties. Iron and Al hydroxides exist in soils across a wide spectrum of crystallinity, ranging from dissolved Fe and Al cations which combine with organics to form organo-metal precipitates to the more crystalline end members, goethite and gibbsite, which sorb SOM through a variety of molecular interactions. Though the importance of these sorption and precipitation... Categories: Data; Tags: Arizona, California, Flagstaff, Hawaii, Michigan, All tags... Santa Cruz, USGS Science Data Catalog (SDC), carbon, geoscientificInformation, metal hydroxides, mineral extractions, radiocarbon, soil, Fewer tags Data for Dust deposited on snow cover in the San Juan Mountains, Colorado, 2011-2016: Compositional variability bearing on snow-melt effects 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... Categories: Data; Tags: Black Carbon, Climatology, Colorado River Basin, Dust, Dust-on-Snow, All tags... Geochemistry, Geomorphology, Glaciology, Hydrology, Land Use Change, Light absorbing particles, San Juan Mountains, Colorado, Silverton Colorado, Swamp Angle Study Plot, Telluride, Colorado, USGS Science Data Catalog (SDC), ferric oxide minerals, snow-radiation modeling, water resource management, Fewer tags