Decadal Trends Reveal Recent Acceleration in the Rate of Recovery from Acidification in the Northeastern U.S.
Citations Over TimeTop 10% of 2014 papers
Abstract
Previous reports suggest variable trends in recovery from acidification in northeastern U.S. surface waters in response to the Clean Air Act Amendments. Here we analyze recent trends in emissions, wet deposition, and lake chemistry using long-term data from a variety of lakes in the Adirondack Mountains and New England. Sulfate concentration in wet deposition declined by more than 40% in the 2000s and sulfate concentration in lakes declined at a greater rate from 2002 to 2010 than during the 1980s or 1990s (-3.27 μeq L(-1)year(-1) as compared to -1.26 μeq L(-1)year(-1)). During the 2000s, nitrate concentration in wet deposition declined by more than 50% and nitrate concentration in lakes, which had no linear trend prior to 2000, declined at a rate of -0.05 μeq L(-1)year(-1). Base cation concentrations, which decreased during the 1990s (-1.5 μeq L(-1) year(-1)), have stabilized in New England lakes. Although total aluminum concentrations increased since 1999 (2.57 μg L(-1) year(-1)), there was a shift to nontoxic, organic aluminum. Despite this recent acceleration in recovery in multiple variables, both ANC and pH continue to have variable trends. This may be due in part to variable trajectories in the concentrations of base cations and dissolved organic carbon among our study lakes.
Related Papers
- → Assessing the priming effect of dissolved organic matter from typical sources using fluorescence EEMs-PARAFAC(2020)84 cited
- → Sources, Transport, and Transformation of Dissolved Organic Matter in a Large River System: Illustrated by the Changjiang River, China(2019)57 cited
- → Comments on the importance of black carbon in the global carbon cycle(2004)82 cited
- → The sulfur cycle below the sulfate-methane transition of marine sediments(2018)57 cited
- → Determination of dissolved organic matter in streamwater using visible spectrophotometry(1985)33 cited