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RECORD NUMBER: 16 OF 37

OLS Field Name OLS Field Data
Main Title How Much Acidification Has Occurred in Adirondack Region Lakes (New York, USA) since Preindustrial Times.
Author Cumming, B. F. ; Smol, J. P. ; Kingston, J. C. ; Charles, D. F. ; Birks., H. J. B. ;
CORP Author Queen's Univ., Kingston (Ontario). Paleoecological Environmental Assessment and Research Lab. ;ManTech Environmental Technology, Inc., Corvallis, OR. ;Bergen Univ. (Norway). Botanical Inst. ;Camburn (K.E.), Charlotte, NC.;Corvallis Environmental Research Lab., OR.
Publisher c1992
Year Published 1992
Report Number EPA-68-C8-0006; EPA/600/J-92/172;
Stock Number PB92-180371
Additional Subjects Acidification ; Lakes ; Hydrogeology ; Water pollution effects ; Paleolimnology ; Regional analysis ; Watersheds ; Adirondack Mountain ; New York ; Water chemistry ; Aquatic biology ; Diatoms ; Natural emissions ; Mathematical models ; Aluminum ; Acid neutralizing capacity ; Reprints ; Foreign technology ; Dissolved organic carbon
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NTIS  PB92-180371 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/22/1992
Collation 18p
Abstract
Preindustrial and present-day lake water pH, acid neutralizing capacity (ANC), total monomeric aluminum Al(sub m), and dissolved organic carbon (DOC) were inferred from the species composition of diatom and chrysophyte microfossils in the tops (present-day inferences) and bottoms (pre-1850 inferences) of sediment cores collected from a statistically selected set of Adirondack lakes. Results from the study lakes were extrapolated to a predefined target population of 675 low-alkalinity Adirondack region lakes. Estimates of preindustrial to present-day changes in lake water chemistry show that approximately 25-35% of the target population has acidified. The magnitude of acidification was greatest in the low-alkalinity lakes of the southwestern Adirondacks, an area with little geological ability to neutralize acidic deposition and receives the highest annual average rainfall in the region. The authors estimate that approximately 80% of the target population lakes with present-day measured pH = or < 5.2 and 30-45% of lakes with pH between 5.2 and 6.0 have undergone large declines in pH and ANC, and concomitant increases in Al(sub m). Estimated changes in (DOC) were small and show no consistent pattern in the acidified lakes. The study provides the first statistically based regional evaluation of the extent of lake acidification in the Adirondacks.