Lake George
Darrin Fresh Water Institute,
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Bolton Landing, NY 12814

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DFWI Research

Cedar Lane Atmospheric Deposition Station


Percent of Total Annual Precipitation sampled since 1980 at the Cedar Lane Atmospheric Deposition Station.

Year

Total Precipitation (inches)

Total Sampled Precipitation

Percent of Precipitation Sampled

1980

34.48

13.41

38.9*

1981

34.83

34.08

97.8

1982

23.66

20.94

88.5

1983

60.67

54.92

90.5

1984

44.54

32.94

74.0

1985 through 1991 - gap in collection record

1992

44.30

42.30

95.5

1993

39.88

27.95

70.1

1994

42.54

35.99

84.6

1995

29.61

16.70

56.4

1996

44.66

16.97

38.0

1997

33.69

20.08

59.6

1998

37.71

27.42

72.7

1999

34.79

31.83

91.5

2000

46.39

44.61

96.2

2001

29.27

27.63

94.4

2002

44.50

43.72

98.2

2003

50.34

48.95

97.2

2004

41.17

41.18

100.0

2005

50.81

50.83

100.0

2006

53.66

52.23

97.3

2007

40.68

39.33

96.7

2008

54.01

47.81

88.5

2009

41.41

40.23

97.2

*  not enough precipitation collected; no calculations

The Cedar Lane Atmospheric Deposition Station was established in 1980 by the New York State Department of Environmental Conservation at the south end of Lake George, NY, within the Adirondack Park.   At that time, support for the station was provided by the US Environmental Protection Agency.  The atmospheric data were used in conjunction with the 1980-1982 Lake George Urban Runoff Study which was part of the Nationwide Urban Runoff Program, and evaluated the effects of storm-water runoff on the water quality of a recreational lake. 

The site was non-operational from 1985 through 1991.  In 1991, the station was re-established by the Department of Environmental Conservation with financial support provided by the Lake George Park Commission.  The station has had a continuous 20-year record since that time.  Station operation has been conducted according to NADP/NTN standards, with the exception of event-based wetfall sampling for the analysis of anions, cations and plant nutrients following individual precipitation events of ~0.10 inches or more of wetfall.  The NADP/NTN Program collects samples on a weekly basis.  Since1992, the proportion of total annual precipitation chemically analyzed at the Cedar Lane Station has exceeded 80 percent for 16 of the 20 years. 

The high proportion of the total annual precipitation that has been sampled and the event-based sampling of the deposition has allowed a determination of volume-weighted concentrations and loading estimates for analytes that are important in the nutrient-based dynamics of the Lake George Basin.  These data are particularly useful when evaluating and interpreting stormwater runoff from developed and un-developed areas within the Lake George Basin.  Since 1992, volume-weighted concentrations and annual loadings (g/m2/yr) of total phosphorus (TP), total soluble phosphorus (TSP), nitrate (NO3), and sulfate (SO4) in wetfall have decreased, while the pH concentration measured in wetfall has increased by a significant amount during the same period. Some examples of results and trends from the Atmospheric Deposition station are presented here.

 

 

 

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