Research Hydrologist
Email:
jkoch@usgs.gov
Office Phone:
303-817-5595
Fax:
907-786-7150
ORCID:
0000-0001-7180-6982
Location
4210 University Drive
Anchorage
, AK
99508-4626
US
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This dataset contains taxonomic information, counts, and lengths of macroinvertebrates collected from rivers in northwest Alaska using drift and kick nets during summer and fall 2015-2019. Version History: First release: February 2024 Revised: August 2024 (ver. 1.1) Revised: December2024 (ver. 1.2)
Categories: Data,
Data Release - Revised;
Tags: Actinopterygii,
Age composition,
Alaska,
Animals/Invertebrates,
Animals/Invertebrates, All tags...
Aquatic Biology,
Aquatic Invertebrates,
Aquatic ecosystems,
Arachnida,
Arctic,
Arthropods,
Arthropods,
Biota,
Bivalvia,
Clitellata,
Ecology,
Entognatha,
Environment,
Freshwater ecosystems,
Gastropoda,
InlandWaters,
Insecta,
Macroinvertebrates,
Nemata,
Turbellaria,
USGS Science Data Catalog (SDC),
Water Quality, Fewer tags
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This data release contains measurements from continuous monitors of stream temperature, groundwater temperature, and well water levels, and discrete measurements of discharge and stream shading.
Categories: Data;
Tags: Alaska,
Climate change,
Environment,
Freshwater ecosystems,
GeoScientificInformation, All tags...
Ground water,
Groundwater,
Hydrology,
Hydrology,
Kenai Peninsula,
Rivers/Streams,
Stream discharge,
Streamflow,
USGS Science Data Catalog (SDC),
Water Resources,
Water resources,
Water temperature,
Wetland ecosystems, Fewer tags
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Permafrost (perennially frozen) and active-layer (seasonally thawed) soils varying in soil carbon (C) and nitrogen (N) content and radiocarbon age were collected from three sites in interior Alaska to determine potential release of dissolved organic carbon (DOC), total dissolved N (TDN), dissolved organic nitrogen (DON), and dissolved inorganic nitrogen (DIN) upon thaw. Soil cores were cut into 15 cm thick sections, and deep active-layer (15-30 cm above the permafrost boundary) and shallow permafrost (15-30 cm below the permafrost boundary) sections were thawed and leached with deionized water. Soil leachates were analyzed for DOC, TDN, nitrate (NO3-), and ammonium (NH4+) concentrations, dissolved organic matter...
Categories: Data;
Tags: Alaska,
Ecology,
Soil Sciences,
USGS Science Data Catalog (SDC),
Water Quality, All tags...
boreal,
carbon,
carbon-14 analysis,
environment,
nitrogen,
permafrost,
water chemistry, Fewer tags
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High latitude, boreal watersheds are nitrogen-limited ecosystems that export large amounts of organic carbon. Key controls on carbon cycling in these environments are the biogeochemical processes affecting the nitrogen cycle. This data release presents results of a 3-year field study from 2008-2011 to document the relation between seasonal and transport-associated changes in carbon and nitrogen pools within Nome Creek, an upland headwater tributary of the Yukon River, Alaska, and two first order tributaries to Nome Creek, West Twin Creek and East Twin Creek. Stream-water geochemistry was characterized using: a) biweekly sampling at fixed sampling stations to assess changes through the course of a summer season;...
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This dataset includes discrete water quality and discharge data for three streams that flow through wetlands. There are two measurement and sampling locations on each stream: one immediately upstream from the wetland and one immediately downstream from the wetland. Measurements and sample collection occurred in 2010 and 2011 at West Twin Creek, AK; in 2019 and 2020 at Allequash Creek, WI; and in 2013, 2014, and 2017 at the Big Thompson River, CO. The upstream and downstream data from Allequash Creek and the Big Thompson River are from established USGS sites. At Allequash Creek, the downstream site is USGS 05357206 Allequash Creek Site No. 3 Nr Boulder Junction, WI, and the upstream site is USGS 5357205 Allequash...
Categories: Data;
Tags: Alaska,
Colorado,
Ecology,
Hydrology,
USGS Science Data Catalog (SDC), All tags...
Water Quality,
Wisconsin,
dissolved inorganic carbon,
dissolved organic carbon,
environment,
inland wetlands,
inlandWaters,
water quality, Fewer tags
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