caa a22 4500 605516723 CHVBK 20210128100715.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10533-015-0102-7 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0102-7 Factors influencing critical and target loads for the acidification of lake-watersheds in the Adirondack region of New York [Elektronische Daten] [Qingtao Zhou, Charles Driscoll, Timothy Sullivan, Afshin Pourmokhtarian] Critical loads (CLs) and target loads (TLs) are tools used to guide air emissions control strategies for recovery of forest and aquatic ecosystems impacted by elevated atmospheric deposition. We use the dynamic hydrochemical model-PnET-BGC (photosynthesis evapotranspiration biogeochemical) to evaluate biophysical factors that affect CLs and TLs of acidity for the Constable Pond watershed, as an example of a chronically acidic drainage lake in the Adirondack region of New York, USA. These factors included a range of future scenarios of decreases in atmospheric nitrate, ammonium and sulfate deposition from present to 2200; historical forest harvesting; supply of naturally occurring organic acids; and variations in lake hydraulic residence time. Simulations show that decreases in sulfate deposition were more effective in increasing lake acid neutralizing capacity (ANC) than equivalent decreases in nitrate deposition, 4.6 times greater in 2040-2050 but decreasing to 2 times greater by 2200. Future lake ANC is anticipated to increase to a greater extent when the watershed experiences past forest cutting compared to a scenario without historical land disturbance. Under higher rates of watershed supply of naturally occurring dissolved organic carbon (DOC~1000µmol C/L), ANC is lower than under relatively low DOC supply (~100µmol C/L) due to strongly acidic functional groups associated with dissolved organic matter. Lakes with longer hydrologic residence time exhibit less historical acidification and can achieve a greater ANC from recovery than lakes with shorter hydrologic residence times due to in-lake production of ANC. This study improves understanding of how biogeochemical processes at the landscape level can influence the rate and extent of recovery of lake-watersheds in response to decreases in atmospheric deposition. The Author(s), 2015 Adirondacks nationallicence Acid neutralizing capacity nationallicence Acidification nationallicence Critical loads (CLs) nationallicence Target loads (TLs) nationallicence Zhou Qingtao Department of Civil and Environmental Engineering, Syracuse University, 13244, Syracuse, NY, USA aut Driscoll Charles Department of Civil and Environmental Engineering, Syracuse University, 13244, Syracuse, NY, USA aut Sullivan Timothy E&S Environmental Chemistry, 97339, Corvallis, OR, USA aut Pourmokhtarian Afshin Department of Earth and Environment, Boston University, 02215, Boston, MA, USA aut Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 353-369 0168-2563 124:1-3<353 2015 124 10533 https://doi.org/10.1007/s10533-015-0102-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0102-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhou Qingtao Department of Civil and Environmental Engineering, Syracuse University, 13244, Syracuse, NY, USA aut NATIONALLICENCE 700 1- Driscoll Charles Department of Civil and Environmental Engineering, Syracuse University, 13244, Syracuse, NY, USA aut NATIONALLICENCE 700 1- Sullivan Timothy E&S Environmental Chemistry, 97339, Corvallis, OR, USA aut NATIONALLICENCE 700 1- Pourmokhtarian Afshin Department of Earth and Environment, Boston University, 02215, Boston, MA, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 353-369 0168-2563 124:1-3<353 2015 124 10533