scholarly journals Long-term trends of chloride concentrations in Lake Biwa and why they are increasing (2) Estimation of chloride loadings from the catchment of Lake Biwa, and causes of increase in chloride concentrations in lake water during the last 30 years

2010 ◽  
Vol 71 (3) ◽  
pp. 285-303 ◽  
Author(s):  
Kazuhide HAYAKAWA ◽  
Takahiro OKAMOTO
Keyword(s):  
Lake Water ◽  
Lake Biwa ◽  
Long Term Trends ◽  
Chloride Concentrations

Analysis of Long-Term Trends in Lake Water Quality Observations

2012 ◽  
Vol 12 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Eung Seok Kim ◽  
Jo Hee Yoon ◽  
Jae Woon Lee ◽  
Hyun Il Choi
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Lake Water Quality ◽  
Long Term Trends

scholarly journals Worldwide lake level trends and responses to background climate variation

2020 ◽  
Vol 24 (5) ◽  
pp. 2593-2608 ◽  
Author(s):  
Benjamin M. Kraemer ◽  
Anton Seimon ◽  
Rita Adrian ◽  
Peter B. McIntyre
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Environmental Changes ◽  
Southern Oscillation ◽  
Climate Variation ◽  
Water Levels ◽  
P Value ◽  
Long Term Trends ◽  
Background Climate

Abstract. Lakes provide many important benefits to society, including drinking water, flood attenuation, nutrition, and recreation. Anthropogenic environmental changes may affect these benefits by altering lake water levels. However, background climate oscillations such as the El Niño–Southern Oscillation and the North Atlantic Oscillation can obscure long-term trends in water levels, creating uncertainty over the strength and ubiquity of anthropogenic effects on lakes. Here we account for the effects of background climate variation and test for long-term (1992–2019) trends in water levels in 200 globally distributed large lakes using satellite altimetry data. The median percentage of water level variation associated with background climate variation was 58 %, with an additional 10 % explained by seasonal variation and 25 % by the long-term trend. The relative influence of specific axes of background climate variation on water levels varied substantially across and within regions. After removing the effects of background climate variation on water levels, long-term water level trend estimates were lower (median: +0.8 cm yr−1) than calculated from raw water level data (median: +1.2 cm yr−1). However, the trends became more statistically significant in 86 % of lakes after removing the effects of background climate variation (the median p value of trends changed from 0.16 to 0.02). Thus, robust tests for long-term trends in lake water levels which may or may not be anthropogenic will require prior isolation and removal of the effects of background climate variation. Our findings suggest that background climate variation often masks long-term trends in environmental variables but can be accounted for through more comprehensive statistical analyses.

scholarly journals Worldwide lake level trends and responses to background climate variation

2019 ◽  
Author(s):  
Benjamin M. Kraemer ◽  
Anton Seimon ◽  
Rita Adrian ◽  
Peter B. McIntyre
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Environmental Changes ◽  
Southern Oscillation ◽  
Climate Variation ◽  
Water Levels ◽  
P Value ◽  
Long Term Trends ◽  
Background Climate

Abstract. Lakes provide many important benefits to society including drinking water, flood attenuation, nutrition, and recreation. Anthropogenic environmental changes may affect these benefits by altering lake water levels. However, background climate oscillations such as the El Nino Southern Oscillation, and the North Atlantic Oscillation can obscure long-term trends in water levels, creating uncertainty over the strength and ubiquity of anthropogenic effects on lakes. Here we account for the effects of background climate variation and test for long-term (1992–2019) trends in water levels in 117 globally-distributed large lakes using satellite altimetry data. On average, 27 % of water level variation in individual lakes was associated with background climate variation. The relative influence of specific axes of background climate variation on water levels varied substantially across and within regions. After removing the effects of background climate variation on water levels, long-term water level trend estimates were lower (+1.0 cm year−1) than calculated from raw water level data (+1.4 cm year−1). However, the trends became more statistically significant in 76 % of lakes after removing the effects of background climate variation (the median p-value of trends changed from 0.12 to 0.02). Thus, robust tests for long-term trends in lake water levels which may or may not be anthropogenic will require prior isolation and removal of the effects of background climate variation. Our findings suggest that background climate variation often masks long-term trends in environmental variables, but can be accounted for through more comprehensive statistical analyses.

scholarly journals A model approach to assess the long-term trends of indirect photochemistry in lake water. The case of Lake Maggiore (NW Italy)

2011 ◽  
Vol 409 (18) ◽  
pp. 3463-3471 ◽  
Author(s):  
Marco Minella ◽  
Michela Rogora ◽  
Davide Vione ◽  
Valter Maurino ◽  
Claudio Minero
Keyword(s):  
Lake Water ◽  
Lake Maggiore ◽  
Long Term Trends ◽  
Nw Italy ◽  
Model Approach

Long-term trends in the chemistry of precipitation and lake water in the Adirondack Region of New York, USA

1995 ◽  
Vol 85 (2) ◽  
pp. 583-588 ◽  
Author(s):  
C. T. Driscoll ◽  
K. M. Poster ◽  
W. Kretser ◽  
D. J. Raynal
Keyword(s):  
New York ◽  
Lake Water ◽  
Long Term Trends

scholarly journals Long-term trends of acid anion in the rain water in Lake Taihu watershed and the lake water, and its environmental implications

2019 ◽  
Vol 31 (1) ◽  
pp. 88-98 ◽  
Author(s):  
ZHAO Jian ◽  
◽  
DAI Dan ◽  
WANG Rui ◽  
HAO Chenlin ◽  
...  
Keyword(s):  
Lake Water ◽  
Lake Taihu ◽  
Rain Water ◽  
Acid Anion ◽  
Environmental Implications ◽  
Long Term Trends

Long-Term Trends in Lake Water pH and Metal Concentrations Inferred from Diatoms and Chrysophytes in Three Lakes near Sudbury, Ontario

1992 ◽  
Vol 49 (S1) ◽  
pp. 17-24 ◽  
Author(s):  
Aruna S. Dixit ◽  
Sushil S. Dixit ◽  
John P. Smol
Keyword(s):  
Lake Water ◽  
Sediment Cores ◽  
Chemical Recovery ◽  
Metal Concentrations ◽  
Acid Lakes ◽  
Water Ph ◽  
Long Term Trends ◽  
The 1960S ◽  
Provincial Park

Diatom valves and chrysophyte scales were analyzed in sediment cores to assess historical (post-1860) and recent (since 1970) trends in lake water pH, total [Al], and [Ni] in Lumsden, George, and Acid lakes (Killarney Provincial Park, Ontario). Although acidification in Lumsden and Acid lakes started in the 1930s, rapid acidification only occurred since the 1960s. As lake water pH declined, inferred [Al] greatly increased causing the extirpation of the sport fisheries. In nearby George Lake, acidification started in the 1920s, and inferred lake water pH declined about 0.5 of a pH unit by 1960. The fish community in George Lake survived where the inferred acidification was less severe than Acid and Lumsden lakes. As in previous paleolimnological studies, chrysophytes generally indicate earlier and more marked acidification trajectories when compared with trends inferred from diatoms, probably because the vernal blooming and euplanktonic chrysophytes are tracking spring pH depressions. Although all three lakes have acidified and metal concentrations have increased during this century, our study provides evidence that these lakes, located as far as 60 km away from Sudbury, are showing signs of biological and chemical recovery as a result of recent reductions in SO2 emissions from the Sudbury smelters.

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