00000nam 2200000za 4500 9.805862 CaOODSP 20221107135744 cr ||||||||||| 150406s2000 oncdb ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-1/2000-055E-PDF Clair, Thomas A. Freshwater chemistry acidification trends in sensitive Nova Scotia lakes [electronic resource] : 1983-1997 / Thomas A. Clair, James M. Ehrman and Chul-Un Ro. Ottawa : Fisheries and Oceans Canada, 2000. 16 p. : fig., graphs, maps, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/055 Includes bibliographical references (p. 9-10). Nova Scotia lakes have been sampled at least twice yearly since the spring of 1983 for a number of water chemistry parameters. Statistical analysis of a number of the water chemistry variables was done in 1998 to see if trends could be detected in the main ions which caused acid precipitation or which could be dependent on changes in acidification. The data show consistent results. No long-term trends in pH, acid neutralization capacity (ANC) or dissolved organic carbon were detected. A decrease in long-term sulfate and in total sum of cations are shown. The latter two parameter trends suggest two things: a) that the main acidifying ion seems to be decreasing in the system, and b) that the weathering caused by the sulfuric acid is also decreasing. The results thus suggest that long-term chronic acidification is decreasing, but not enough to change pH or ANC. Also, the results of this trend analysis are compared to previous ones which were done on 1983-91 and 1983-1994 data series. gccst Fisheries resources gccst Salt water fish gccst Lakes gccst Acid rain gccst Fisheries management Ehrman, James M. Ro, Chul-Un. Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/055 (CaOODSP)9.507740 PDF 100 KB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-2000-055-eng.pdf