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Filter Total Items: 105
Detrital Apatite U-Pb and Fission-Track Thermochronology from Yukon-Tanana Upland rivers, East-Central Alaska Detrital Apatite U-Pb and Fission-Track Thermochronology from Yukon-Tanana Upland rivers, East-Central Alaska
This dataset provides apatite U-Pb and fission-track data from modern river samples from 14 catchments draining the Yukon-Tanana Upland of east-central Alaska.
Records and Data Produced at the USGS Argon Extraction Laboratory in Anchorage, Alaska Records and Data Produced at the USGS Argon Extraction Laboratory in Anchorage, Alaska
This dataset is a collection of analytical data of potassium-argon (K/Ar) radiometric age analyses. K/Ar dating used conventional argon measurements by isotope dilution with mass spectrometry, and potassium was determined by flame photometry using a lithium metaborate fusion. The analyses were performed over a period of nearly 20 years, from the mid 1970's to 1994. Most of the argon
Geochemical Analysis, Major and Trace Element Data from the Darby Mountains Area, Seward Peninsula, Alaska, 2017 Geochemical Analysis, Major and Trace Element Data from the Darby Mountains Area, Seward Peninsula, Alaska, 2017
This dataset consists of one table containing whole-rock geochemistry data for 250 igneous and metamorphic rocks from the Darby Mountains area on the Seward Peninsula in western Alaska, collected in 2017. All materials were analyzed by ALS Global, between 2019 and 2020, by a range of different techniques; multiple unique entries for a given element relate to different analytical methods...
Data Supporting a Physics-Based Fire Behavior Simulation Model to Predict Burn Severity and Post-Fire Debris Flow Hazards Data Supporting a Physics-Based Fire Behavior Simulation Model to Predict Burn Severity and Post-Fire Debris Flow Hazards
Post-wildfire flooding and debris flows pose a threat to ecosystems and infrastructure. As the frequency and size of severe wildfires increase, there is a growing need for predictive debris flow hazard modeling in unburned but fire-prone landscapes. However, no crosswalks have been established between physics-based models of fire behavior and the remotely sensed burn severity inputs...
Flood Frequency Data for Selected Streamgages in the Mendenhall River Basin, Alaska, 1966–2023 Flood Frequency Data for Selected Streamgages in the Mendenhall River Basin, Alaska, 1966–2023
This data release provides the source data and results of a flood frequency analysis for sites in the Mendenhall River Basin, Alaska, that was conducted using USGS PeakFQ software (Veilleux and others, 2014; Flynn and others, 2006). Data are provided for two streamgages that had at least 10 years of annual peak-flow record. The data include streamgage information, PeakFQ input (.txt and...
Parturition Analyses based on GPS Collar Videos from Female Caribou of the Porcupine and Western Arctic Herds Parturition Analyses based on GPS Collar Videos from Female Caribou of the Porcupine and Western Arctic Herds
Adult female caribou from the Porcupine herd (PCH; 2018-2023) and Western Arctic herd (WAH; 2021, 2023) were fitted with GPS video collars (Vertex Plus, Vectronic Aerospace; 9 sec videos every 20-30 min) to assess parturition, neonate survival (birth through 30 June), and antler shedding. We used video data to validate antler- and movement-based methods for estimating reproduction in...
Chemical Composition of Water in Lakes, Ponds, Rivers, and Creeks in Northwest Alaska Chemical Composition of Water in Lakes, Ponds, Rivers, and Creeks in Northwest Alaska
This dataset includes field and laboratory analyses of water samples collected from lakes, ponds, rivers, and streams in northwest Alaska within Cape Krusenstern National Monument, Noatak National Preserve, Kobuk Valley National Park, Gates of the Arctic National Park and Preserve, and Bering Land Bridge National Preserve. At sites across the five national park units, in situ water...
Water Temperature, Tide Height, and PAR Light Measurements from Izembek, National Wildlife Refuge, Alaska Water Temperature, Tide Height, and PAR Light Measurements from Izembek, National Wildlife Refuge, Alaska
Measurements of water temperature, tide height, and photosynthetic light (PAR: photosynthetic active radiation within the 400-700 nanometers wave band) are provided in four tables for monitoring the abundance and distribution of eelgrass in Izembek and Kinzarof lagoons of Izembek National Wildlife Refuge. These environmental parameters are crucial to the health of eelgrass ecosystems...
Whole Rock Major and Trace Element Chemistry for Igneous, Sedimentary and Metamorphic Rocks from Southcentral Alaska Whole Rock Major and Trace Element Chemistry for Igneous, Sedimentary and Metamorphic Rocks from Southcentral Alaska
This dataset consists of one table containing whole-rock geochemistry data for 748 rocks from southcentral Alaska. All materials in the present study were analyzed by ALS Global between 2014 and 2022 using a range of different techniques, so multiple unique entries for a given element relate to different analytical methods or preparations, as detailed in accompanying metadata, and...
Data on Exposure of Polar Bears Inhabiting Alaska to Highly Pathogenic H5 Clade 2.3.4.4b and N1 Avian Influenza Viruses Data on Exposure of Polar Bears Inhabiting Alaska to Highly Pathogenic H5 Clade 2.3.4.4b and N1 Avian Influenza Viruses
This dataset describes reactivity of sera collected from polar bears inhabiting Alaska to various influenza A antigens to assess prior exposure to H5 clade 2.3.4.4b highly pathogenic avian influenza viruses (HPAIVs).
Lower Cook Inlet Fish and Invertebrate Community Composition, Distribution, and Density Lower Cook Inlet Fish and Invertebrate Community Composition, Distribution, and Density
This data package includes seven tables with data about the composition, distribution, relative abundance, seasonal availability, energy density, morphometrics, taxonomy, and stable isotope values of benthic fish and invertebrates, as well as oceanographic data within the proposed oil and gas lease sale area in lower Cook Inlet, Alaska.
Inventory of Shorebirds and other Bird Species in Western Alaska including the Seward Peninsula, Nulato Hills, Unalakleet, and Cape Krusenstern National Monument, 1988-2012 Inventory of Shorebirds and other Bird Species in Western Alaska including the Seward Peninsula, Nulato Hills, Unalakleet, and Cape Krusenstern National Monument, 1988-2012
This data release contains tabular data and photographs from avian surveys of shorebird, predator birds, and other bird species in western Alaska between 1988 and 2012. The data package includes seven tables: 1) characteristics of bird survey sites, 2) habitat classification at survey sites, 3) detections of all birds at survey sites, 4) detections and behaviors of shorebirds and...