Canadian Meteorological Centre (CMC) Daily Snow Depth Analysis Data
Entry ID:
NSIDC-0447
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Summary
Abstract:
This data set consists of Northern Hemisphere snow depth analysis data processed by the Canadian Meteorological Centre (CMC). Snow depth data obtained from surface synoptic observations (synops), meteorological aviation reports (metars), and special aviation reports (SAs) were acquired from the World Meteorological Organization (WMO) information system for use in the CMC analyses. This CMC data set includes daily observations from 1998 through 2011 and will be updated annually. Monthly averages and monthly climatologies of snow depth and estimated Snow Water Equivalent (SWE) are provided, where SWE was estimated using a density look-up table. The volume of the data set is approximately four gigabytes. Data are provided in tab-delimited ASCII text files and are available via FTP.
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Description:
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 90.0
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S: 0.0
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E: 180.0
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W: -180.0
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Data Set Citation
Dataset Originator/Creator:
Brown, Ross D. and Bruce Brasnett
Dataset Title:
Canadian Meteorological Centre (CMC) Daily Snow Depth Analysis Data
Dataset Release Date:
2010-02-10, updated annually.
Dataset Release Place:
Boulder, Colorado USA
Dataset Publisher:
National Snow and Ice Data Center (NSIDC)
Online Resource:
http://nsidc.org/data/nsidc-0447.html
Temporal Coverage
Start Date:
1998-03-12
Stop Date:
2011-12-31
Data Resolution
Latitude Resolution:
24 km
Longitude Resolution:
24 km
Temporal Resolution:
Daily
Quality
This data set contains the results from the fifth cruise in a series of six, producing a good coverage of the area at varying times and conditions.
Data collection: At each of the twenty three stations, a shallow oblique haul, down to 200m, was made using a rectangular midwater trawl (RMT1+8). When ice conditions permitted, an additional deep oblique haul, from 200m to ... 1000m, was also made. One specific horizontal tow was made. When ice conditions made it unsafe to haul the RMT1+8 or when the ship was stopped for the night, vertical hauls were made using an ORI-2000 conical net. These hauls were made usually from 1000m, although some hauls ranged between 10 and 2000m. Under-ice diving was also carried out. Krill were collected by hand nets, and behavioural observations were recorded using an underwater video and 16mm cine-camera. The video observation results are published in O'Brien, D.P. (1987) Direct Observations of Euphausia superba and Euphausia crystallorophias under pack-ice during the Antarctic spring of 1985. Journal of Crustacean Biology. 7:437-448.
Ship-board processing: Large and fragile zooplankton were sorted from the remainder of the catch, and all specimen were preserved in Steedman's solution.
Post-ship processing: Krill were sorted into juvenile, male and female. Body length and weight were measured, using a slide caliper and Mettler top-pan balance respectively. Male and female krill were further separated into maturation stages, according to the Makarov and Denys (1981) system. Non-krill zooplankton from the RMT8 samples were speciated, weighed and counted. The total catches of the RMT1 were wet weighed, and the larvae of the euphausiid species Euphausia frigida and Thysanoessa macrura were extracted, staged and counted under a dissecting microscope. The larvae of other euphausiids Eupahusia superba, Euphausia crystallorophias and Euphausia triacantha were not collected by the RMT1. Consistency can be checked by comparison between different trawl methods, and the under-ice samples. A CTD cast and water collection was carried out at each net sampling station, so there is consistency between the oceanography and biology data.
Access Constraints
An excel spreadsheet containing all the data presented in the referenced article is available for download from the URL given below. A pdf copy of the referenced article is also available for download from the URL given below. Data is in the biodiversity database and also published to GBIF, OBIS and SCAR-MarBIN.
Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).
Please follow instructions listed in the citation reference provided at the URL below when using these data.
Data Set Progress
COMPLETE
Distribution
Distribution Media:
HTTP
Distribution Size:
30 kb
Distribution Format:
excel
Fees:
free
Distribution Media:
HTTP
Distribution Size:
7.5 MB
Distribution Format:
pdf
Fees:
free
Personnel
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Role:
DIF AUTHOR
Phone:
+61 3 6232 3364
Fax:
+61 3 6232 3158
Email:
graham.hosie at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City:
Kingston
Province or State:
Tasmania
Postal Code:
7050
Country:
Australia
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Phone:
+61 3 6232 3340
Fax:
+61 3 6232 3351
Email:
dick.williams at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City:
Kingston
Province or State:
Tasmania
Postal Code:
7050
Country:
Australia
Publications/References
O'Brien, D.P. (1987) Direct Observations of Euphausia superba and Euphausia crystallorophias under pack-ice during the Antarctic spring of 1985. Journal of Crustacean Biology. 7:437-448.
Hosie G. et al. (1988) ADBEX III cruise krill/zooplankton sampling data. Australian National Antarctic Research Expedition Research Notes 57
Creation and Review Dates
DIF Creation Date:
1999-10-07
Last DIF Revision Date:
2009-02-27
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