Lake Transparency: A Window into Decadal Variations in Dissolved Organic Carbon Concentrations in Lakes of Acadia National Park, Maine
| Autor: | Charles W. Culbertson, Collin S. Roesler |
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| Rok vydání: | 2016 |
| Předmět: |
Watershed
010504 meteorology & atmospheric sciences National park Land cover 010501 environmental sciences Radiative forcing 01 natural sciences Colored dissolved organic matter Oceanography Atmospheric chemistry Dissolved organic carbon Environmental science Seasonal cycle 0105 earth and related environmental sciences |
| Zdroj: | Aquatic Microbial Ecology and Biogeochemistry: A Dual Perspective ISBN: 9783319302577 |
| Popis: | A 40-year time series of Secchi depth observations from approximately 25 lakes in Acadia National Park, Maine, USA, evidences large variations in transparency between lakes but relatively little seasonal cycle within lakes. However, there are significant coherent patterns over the time series, suggesting that large-scale processes are responsible. It has been suggested that variations in colored dissolved organic matter (CDOM) are primarily responsible for the variations in transparency, both between lakes and over time and further that CDOM is a robust optical proxy for dissolved organic carbon (DOC). Here we present a forward model of Secchi depth as a function of DOC based upon first principals and bio-optical relationships. Inverting the model to estimate DOC concentration from Secchi depth observations compared well with the measured DOC concentrations collected since 1995 (RMS error < 1.3 mg C l−1). This inverse model allows the time series of DOC to be extended back to the mid-1970s when only Secchi depth observations were collected, and thus provides a means for investigating lake response to climate forcing, changing atmospheric chemistry and watershed characteristics, including land cover and land use. |
| Databáze: | OpenAIRE |
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