John Priscu
2014-11-04
Bathymetric Polynomials
tabular digitial data
McMurdo Dry Valleys LTER
McMurdo Dry Valleys LTER
10.6073/pasta/e575611426ccea2d51f352a436caa9f1
http://mcm.lternet.edu/content/bathymetric-polynomials
As part of the Long Term Ecological Research in the McMurdo Dry Valleys of Antarctica, bathymetric data was collected for Lakes Hoare, Fryxell and Bonney. This table contains third order polynomial equations to fit the area vs. depth data of these lakes.
Data contained in these files has been subjected to quality control standards imposed by the investigator. The user of this data should be aware that, while efforts have been taken to ensure that these data are of the highest quality, there is no guarantee of perfection for the data contained herein and the possibility of errors exists. If you encounter questionable data, please contact the MCM LTER data manager corrected or qualified.Thus, these data may be modified and future data will be appended.
1995-11-01
1995-11-30
ground condition
As needed
Lake Hoare occupies a narrower portion of the Taylor Valley, dammed by the Canada Glacier. It would drain almost completely without this dam. There are a number of islands which may be related to an old terminal of Canada Glacier. The lake is fed primarily from direct runoff from the glacier, as well as meltwater streams. (Lake level rose ~1.5 m between 1972 and 1996). There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 15 Maximum Length (km): 4.2 Maximum Width (km): 1 Maximum Depth (m): 34 Surface Area (km^2): 1.94 Ice Thickness Average Surface (m): 3.1 - 5.5 Volume (m^3 * 10^6): 17.5
162.935836791992
162.784423828125
-77.623085021973
-77.639259338379
73m
73m
meter
The Lake Fryxell basin is formed by a moraine depression in a wider portion of the Taylor Valley. It has a number of moraine islands and shallower areas, as well as several relatively well developed deltas. The lake is fed by at least 10 meltwater streams with a total drainage catchment of 230 km2. The lake is dammed to the southwest by the Canada Glacier and is topographically closed. It is perennially ice covered; during summer months, an ice-free moat generally forms around much of the lake margin. Lake levels have risen ~2 m between 1971 and 1996. There are no surface outflows; the only known water loss is through ice ablation (evaporation, sublimation and physical scouring). Valley: Taylor Distance to Sea : 9 Maximum Length (km): 5.8 Maximum Width (km): 2.1 Maximum Depth (m): 20 Surface Area (km^2): 7.08 Ice Thickness Average Surface (m): 3.3 - 4.5 Volume (m^3 * 10^6): 25.2
163.259582519531
163.048782348633
-77.597076416016
-77.622711181641
18m
18m
meter
Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. The west lobe is flanked by Taylor glacier. Valley: Taylor Distance to Sea : 25 Maximum Length (km): 4.8 Maximum Width (km): 0.9 Maximum Depth (m): 37 Surface Area (km^2): 3.32 Ice Thickness Average Surface (m): 3 - 4.5 Volume (m^3 * 10^6): 54.7
162.536209106445
162.353210449219
-77.697700500488
-77.724441528320
57m
57m
meter
Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. Valley: Taylor Distance to Sea : 28 Maximum Length (km): 2.6 Maximum Width (km): 0.9 Maximum Depth (m): 40 Surface Area (km^2): 0.99 Ice Thickness Average Surface (m): 2.8-4.5 Volume (m^3 * 10^6): 10.1
162.354934692383
162.269104003906
-77.714805603027
-77.727287292480
57m
57m
meter
[term:vocabulary]
None
<cntorg>McMurdo Dry Valleys LTER</cntorg> <onlink>http://mcm.lternet.edu</onlink> <span property="dc:title" content="McMurdo Dry Valleys LTER" class="rdf-meta element-hidden"></span>
Name: Peter Doran Role: associated researcher Name: Jeffrey Schmok Role: associated researcher Name: Chris Gardner Role: data manager Name: Inigo San Gil Role: data manager
Not Applicable
Not Applicable
Field and/or Lab Methods
Â Data was collected by Jeffrey Schmok in November 1995 in order to prepare the Golder report on the bathymetry of Lakes Hoare, Fryxell, and Bonney. A 0.0 m contour is based on a shoreline survey of the frozen moat, and therefore is closer to piezometric water level than to top surface of floating permanent ice. Deeper contours are based on piezometric water level. Thus volume calculations within the ice cover represent volumes of liquid water as if the ice was melted.Â Â Third order polynomial equations were fit to the area vs. depth data both from Schmok's report and from the digitized map data, using SigmaPlot's curve fitting routine. However, since the contour data are already a "best-fit" of measured depth data, and contour intervals are relatively small, it was decided to linearly interpolate the depth:area relationships for depths between the measured depth contours, at 0.5m intervals. Volume was calculated for each 0.5m increment as a truncated cone Â Â Â (V=(h/3)*(A1+A2+sqrt(A1*A2)).
Data was collected by Jeffrey Schmok in November 1995 in order to prepare the Golder report on the bathymetry of Lakes Hoare, Fryxell, and Bonney. A 0.0 m contour is based on a shoreline survey of the frozen moat, and therefore is closer to piezometric water level than to top surface of floating permanent ice. Deeper contours are based on piezometric water level. Thus volume calculations within the ice cover represent volumes of liquid water as if the ice was melted. Third order polynomial equations were fit to the area vs. depth data both from Schmok's report and from the digitized map data, using SigmaPlot's curve fitting routine. However, since the contour data are already a "best-fit" of measured depth data, and contour intervals are relatively small, it was decided to linearly interpolate the depth:area relationships for depths between the measured depth contours, at 0.5m intervals. Volume was calculated for each 0.5m increment as a truncated cone (V=(h/3)*(A1+A2+sqrt(A1*A2)).
unknown
bthpoly
Location Name
Name of lake where measurement was made
The data provider
Name of lake where measurement was made
Polynomial
third order polynomial equation to fit area vs. depth data
The data provider
third order polynomial equation to fit area vs. depth data
r^2
r squared value
The data provider
r^2
Comments
Helpful hints
The data provider
Helpful hints
McMurdo Dry Valleys LTER
The data distributor shall not be liable for innacuracies in the content
http
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0
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1
column
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http://mcm.lternet.edu/sites/default/files/bthpoly.csv
None
2014-11-04
2014-11-04
McMurdo Dry Valleys LTER
http://mcm.lternet.edu
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