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Data
»
Spatial coverage and inter-annual persistence of cryoconite holes on Canada and Commonwealth glaciers, McMurdo Dry Valleys, Antarctica (2014-2015)
GLACIER_GSC
File:
mcmlter-glac-mass-gsc-20210326.csv
(30.75 KB)
...
or query the dataset by variables and dates of interest:
Variables
DATASET_CODE
Label:
Dataset code
Definition:
Internal dataset code.
Type:
Nominal
Missing values:
None specified
SAMPLING_DATE
Label:
Sampling date
Definition:
Date when measurements were taken.
Type:
Date/time
Date format:
MM/DD/YYYY
Missing values:
None specified
GLACIER
Label:
Glacier name
Definition:
Name of the glacier (Canada or Commonwealth) where the measurement was taken.
Type:
Nominal
Missing values:
None specified
SAMPLING_SITE
Label:
Sampling site
Definition:
Code referring to the sampling site where measurements were taken. Sites 1-4 are located on Commonwealth Glacier and sites 5-8 are on Canada Glacier.
Type:
Nominal
Missing values:
None specified
CENTERPOST_LAT
Label:
Centerpost latitude
Definition:
Latitude of the sampling site’s central post in decimal degrees.
Type:
Nominal
Missing values:
None specified
CENTERPOST_LON
Label:
Centerpost longitude
Definition:
Longitude of the sampling site’s central post in decimal degrees.
Type:
Nominal
Missing values:
None specified
CRYO_ORDER
Label:
Measurement order
Definition:
Consecutive order in which the cryoconite holes were measured. A code assigned to each cryoconite hole based on the transect wedge in which it was sampled (ordered numerically) and the consecutive order in which the holes were measured within that transect (labeled alphabetically). For example 05-C refers to the third (alphabetical) cryoconite hole measured in transect wedge #5. See methods for elaboration on this variable.
Type:
Nominal
Missing values:
None specified
START_DISTANCE_A
Label:
Start Distance (A)
Definition:
Distance (cm) along the transect line from the center post to the closest border of the cryoconite hole.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
END_DISTANCE_B
Label:
End Distance (B)
Definition:
Distance (cm) along the transect line from the center post to the farthest border of the cryoconite hole.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
PERP_DISTANCE_C
Label:
Perpendicular Distance (C)
Definition:
Distance (perpendicular to the transect line; cm) between the transect line and the closest edge of the cryoconite hole.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
MAJOR_DIAMETER_D
Label:
Major Diameter (D)
Definition:
Diameter (cm) of the major axis of the cryoconite hole.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
MINOR_DIAMETER_E
Label:
Minor Diameter (E)
Definition:
Diameter (cm) of the minor axis of the cryoconite hole.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
CIRCULARITY
Label:
Circularity ratio
Definition:
Ratio of the minor to major axis (diameter of minor:major axes), used to determine if elliptical orientation should be measured. Holes with a circularity less than 0.8 were considered significantly oval or eccentric and required Ratio of the minor to major axis, used to determine if elliptical orientation should be measured. Holes with a circularity less than 0.8 were considered significantly oval or eccentric and required measuring conical distance F.
Type:
Nominal
Missing values:
None specified
CONICAL_POINT_F
Label:
Conical Point (F)
Definition:
For eccentric or oval-shaped cryoconite holes, this records the location (along the transect line; cm) of the conical point oriented towards, rather than away from, the lesser transect tape. This is a rough measure of the angular orientation of an oval on the glacial surface; see methods for elaboration. Blank cells indicate samples for which this measurement was not applicable.
Type:
Physical quantity
Unit:
centimeter
Maximum:
Not specified
Minimum:
Not specified
Precision:
Not specified
Missing values:
None specified
MELTWATER_STATE
Label:
Meltwater state
Definition:
Physical state of meltwater within the cryoconite hole. Classified as either “liquid” (liquid meltwater is present in the hole), “frozen” (column consists of refrozen meltwater) or “dry” (cryoconite hole is hollow/ fully drained).
Type:
Nominal
Missing values:
None specified
ICE_LID_PRESENT
Label:
Ice Lid Presence
Definition:
Indicates whether a liquid-filled cryoconite hole was open to the surface (0) or contained at least one full-coverage ice lid between the liquid layer and glacial surface (1). Note that the numeric code only indicates absence/presence and holes containing multiple stratified ice lids are still indicated by (1). Ice lids are not applicable to fully frozen or dry columns since they do not contain underlying liquid melt. Blank cells indicate missing values.
Type:
Nominal
Missing values:
None specified
COMMENTS
Label:
Comments
Definition:
Additional comments to describe the sampling site or cryoconite hole being measured.
Type:
Nominal
Missing values:
None specified
Data Source Details
Header lines:
1
Footer lines:
1
Orientation:
Column
Quote character:
"
Field delimiter:
,