• Chemical Composition of Large Lakes in Alaska’s Arctic Network, 2013-2014

    Metadata Updated: March 17, 2021

    The chemical composition of lakes is an important ecosystem property that can have considerable influence on aquatic ecosystem structure and function. Since lake chemistry is sensitive to climate and disturbance, lakes may serve as a sentinel of current and projected [SDM1] climate change through long-term monitoring. Here, we report findings from a two-year pilot study aimed at characterizing the chemical composition of large lakes in National Park Service lands of the Arctic Inventory and Monitoring Network (ARCN). We collected water samples from 20 large lakes in Bering Land Bridge National Preserve (BELA), Gates of the Arctic National Park (GAAR), and Noatak National Preserve (NOAT) during the 2013 and 2014 field seasons (between June and September). Water samples were analyzed for dissolved organic matter (DOM) composition, nutrient concentrations, major cations and anions, and water stable isotopes. We also collected field measurements of lake surface temperature and temperature profiles, specific conductivity, and pH. We observed considerable variation in the chemical composition of large lakes with ARCN parks. For instance, DOC concentrations ranged from 1 to 12 mgC L-1 across all lakes, and DOM aromaticity was highly variable, as indicated by measurements of specific ultraviolet absorbance (SUVA254). Nutrient concentrations (nitrogen and phosphorus species) were generally low, indicating oligotrophic conditions and likely strong nutrient-limitation of primary production. Cation and anion concentrations varied across lakes, reflecting spatial variations in lithology. Overall, large lakes appear to be unimpaired with respect to a broad suite of water quality parameters. However, Arctic lakes are likely vulnerable to climate-driven changes hydrology and landscape disturbance (e.g. wildfire and permafrost thaw). Future monitoring of large lakes ARCN should be designed to detect chemical and hydrologic properties across space and time, both as a means of assessing these vulnerabilities and for improving watershed management activities.

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    Public: This dataset is intended for public access and use. License: No license information was provided.

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    Metadata Created Date March 17, 2021
    Metadata Updated Date March 17, 2021

    Metadata Source

    Harvested from NPS-Harvest - NRSS Data Store

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date March 17, 2021
    Metadata Updated Date March 17, 2021
    Publisher National Park Service
    Unique Identifier Unknown
    Identifier NPS_DataStore_2224786
    Data First Published 2015-01-01
    Data Last Modified 2015-01-01
    Category Geospatial Dataset
    Public Access Level public
    Bureau Code 010:24
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID D:\IRMA\DataStore\Application\OpenData\v1.1\NPS-DataStore.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Data Quality True
    Harvest Object Id 30f86940-f81a-454d-8208-087f8c3a21e8
    Harvest Source Id a73e9b95-126c-4791-a8f2-46fc064cdc62
    Harvest Source Title NPS-Harvest - NRSS Data Store
    Homepage URL https://irma.nps.gov/DataStore/Reference/Profile/2224786
    Program Code 010:118, 010:119
    Related Documents https://irma.nps.gov/DataStore/Reference/Profile/2224786
    Source Datajson Identifier True
    Source Hash a9342a8be5f2832b36e6d49e8c7336d5087cb9eb
    Source Schema Version 1.1
    Spatial -167.5383,65.23254,-149.5289,68.65539
    Temporal 2013-01-01/2014-01-01

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