2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2019 | 9:30 AM - 9:45 AM | REGIONAL STREAM ACIDIFICATION AND CRITICAL LOADS IN THE ADIRONDACK AND SOUTHERN APPALACHIAN MOUNTAINS INCLUDING INTERACTIONS WITH CLIMATE CHANGE | 151 DEF

REGIONAL STREAM ACIDIFICATION AND CRITICAL LOADS IN THE ADIRONDACK AND SOUTHERN APPALACHIAN MOUNTAINS INCLUDING INTERACTIONS WITH CLIMATE CHANGE

Despite decreases in atmospheric nitrogen (N) and sulfur (S) deposition over the past several decades, stream acidity remains suppressed relative to pre-industrial conditions in many areas of the eastern United States. Streams located in particularly acid-sensitive areas continue to be exposed to levels of atmospheric N and S deposition above what is needed to attain stream acid neutralizing capacity (ANC) expected to be generally protective of acid-sensitive biota in the long term. Some streams may not be able to fully recover to pre-industrial ANC conditions due to a combination of extensive historical soil base cation depletion and low base cation weathering rates. Future changes in climate may play a role in acidification recovery and interact with acidification impacts to result in habitat loss for acid-sensitive coldwater species such as brook trout (Salvelinus fontinalis). These topics were explored at the regional scale within the Adirondack Mountains and southern Appalachian Mountains, two regions of the United States where extensive research into surface water acidification has occurred.

Biogeochemistry
Modeling
Spatial

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Presenters/Authors

Todd McDonnell (), E&S Environmental Chemistry, Inc., todd.mcdonnell@esenvironmental.com;