Assessment of the Extent to Which Intensively-studied Lakes are Representative of the Adirondack Region and Response to Future Changes in Acidic Deposition
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Abstract
Many lakes in the Adirondack Mountains, New York, have acidified over the past century due to acidic atmospheric deposition. More recently, most monitored lakes have shown signs of chemical recovery (increase in acid neutralizing capacity) as sulfur deposition levels have declined in response to the Clean Air Act and other emissions control legislation. We used measured and modeled trends in past lakewater acidification and projections of future recovery from acidification to extrapolate results from judgment samples of intensively studied lakes to the population of acid-sensitive Adirondack lakes. Simulations were developed for 70 watersheds using the Model of Acidification of Groundwater in Catchments (MAGIC) to classify lakes according to their sensitivity to change in atmospheric S and N deposition. MAGIC simulations suggested that the modeled Adirondack Long-Term Monitoring Project (ALTM) and Adirondack Effects Assessment Project (AEAP) lakes were largely among the lakes in the population that had acidified most between 1850 and 1990. Most of the modeled ALTM/AEAP lakes were within the top 36% of acid sensitivity, based on model projections of past acidification and future chemical recovery, compared with the 1,829 Adirondack lakes in EPA’s Environmental Monitoring and Assessment Program (EMAP) statistical frame. Results of this research will allow fuller utilization of data from on-going chemical and biological monitoring and process-level studies by providing a basis for regionalization of findings and developing/refining relationships among watershed characteristics, chemical change, and biological responses to changing levels of acidic deposition.
Keywords
Acidic deposition Acidification Adirondack Mountains Air pollution Lakes Nitrogen Recovery Regional representativeness SulfurNotes
Acknowledgements
This research was supported by a contract to E&S Environmental Chemistry, Inc. from the New York State Energy Research and Development Authority, through the Environmental Monitoring, Evaluation, and Protection (EMEP) Program. We thank Mark Watson for his assistance. The Adirondack Effects Assessment Program is supported by a grant from the US Environmental Protection Agency (contract number 68D20171) to S. Nierzwicki-Bauer and C. Boylen at Rensselaer Polytechnic Institute. Although this portion of the work was funded by the US Environmental Protection Agency, it has not been subjected to the Agency’s review and, therefore, does not necessarily reflect the views of the Agency, and no official endorsement should be inferred.
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