Acceptance and utilization of LTER data requires that:
FILE NAME: PRINCIPAL INVESTIGATOR: OTHERS: KEYWORDS: lake, bathymetry, area, depth, polygon, Antarctica, LTER
ABSTRACT: 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 the values for depth, perimeter length,
polygon area and total area per contour used for contour map digitizing.
VARIABLES: location, label, depth (m), perimeter length, polygon area (m2), total area
per contour (m2), comments
RESEARCH LOCATION:
METHODS: 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)).
TIMING:
CITATIONS:
COMMENTS:
STATUS: Public Access (Type 1).
VARIABLE DESCRIPTION: LOG:
NOTE: 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
(; (303)492-4639) so that the data can be
corrected or qualified. Thus, these data may be modified and future
data will be appended.
VARIABLE TYPE UNITS MISSING VALUE INDICATOR MINIMUM MAXIMUM PRECISION
Location String None Required entry n/a n/a n/a
Latitude String DD-MM-SS South Required entry n/a n/a n/a
Longitude String DDD-MM-SS East Required entry n/a n/a n/a
Description String None Null n/a n/a n/a