The data set consists of surface hydrographic data, including temperature and salinity, from the Laptev Sea. Data were collected during the summers of 1980 through 2000. The Arctic and Antarctic Research Institute (AARI) in St. Petersburg collected the data through a Russian-German collaboration.
Researchers used different thermometers and salinometers during the study, with minimum accuracy within 0.05° C or 0.05 psu. Temperature and salinity were measured within the surface layer (<1 m depth).
Because of data-release restrictions in the Russian Exclusive Economic Zone (EEZ), and as specified in the original proposal, data have been interpolated to a regular grid. Data are in ASCII format, and are orderable online.
Eicken, Hajo, and Andrey Proshutinsky. 2000. Summer Surface Hydrographic Measurements in the Laptev Sea, 1980 to 2000. Boulder, CO: National Center for Atmospheric Research.
| Category | Description |
|---|---|
| Data format | ASCII text files |
| Spatial coverage and resolution | Data were collected between 70° N and 78° N, and 110° E and 144° E. Temperature and salinity were measured within the surface layer (<1 m depth). |
| Temporal coverage and resolution | Data were collected in the summers of 1980 through 2000. |
| File naming convention | One file for each year. Files beginning with "S" contain salinity; files beginning with "T" contain temperature. The file "Hydrographicloc.txt" provides the year, month, and day that measurements were taken, and the longitude and latitude of the station location. The file "Hydrographicdata.txt" provides additional information about data collection methods and a list of references. |
| File size | Total data set is approximately 476 KB. |
| Parameter(s) | Ocean surface temperature, salinity |
| Procedures for obtaining data | Data are available for ordering from NCAR. |
1. Contacts and Acknowledgments
2. Detailed Data Description
3. Data Access and Tools
4. Data Acquisition and Processing
5. References and Related Publications
6. Document Information
Hajo Eicken
Geophysical Institute
University of Alaska Fairbanks
Fairbanks, AK 99775-7320
USA
Andrey Proshutinsky
Woods Hole Oceanographic Institution
Mail Stop 29
Woods Hole, MA 02543
USA
Leonid Timokhov
Arctic and Antarctic Research Institute
32 Bering St.
St. Petersburg
Russia
Igor Dmitrenko
Arctic and Antarctic Research Institute
32 Bering St.
St. Petersburg
Russia
Andrei Darovskikh
Arctic and Antarctic Research Institute
32 Bering St.
St. Petersburg
Russia
Roger Andersen
Polar Science Center
Applied Physics Lab
University of Washington
Seattle, WA 98105-6698
USA
The National Science Foundation (NSF) Arctic System Science (ARCSS) and Arctic Research Support and Logistics programs funded the data project. The following grant applies:
National Science Foundation Grant OPP 9876843: Linkages Between Riverine Freshwater Dispersal, Sea-Ice Formation and Large-Scale Sediment Transport in the Central and East Siberian Arctic.
The salinity and temperature data are distributed ascompressed (zipped) files ("Salinity.zip" and "Temperature.zip"). When decompressed, the data are in comma-separated ASCII text (.csv) format.
Each year, 1980 through 2000, has both a temperature file and a salinity file. The file "Hydrographicloc.txt" provides the year, month, and day that measurements were taken, and the longitude and latitude of the station location. The file "Hydrographicdata.txt" provides additional information about data collection methods and a list of references for further reading.
Each temperature file contains these parameters:
Longitude (E)
Latitude (N)
Temperature (deg C)
Each salinity file contains these parameters:
Longitude (E)
Latitude (N)
Salinity (psu)
"Hydrographicloc.txt" contains these parameters:
Year (YYYY)
Month (MM)
Day (DD)
Longitude (E)
Latitude (N)
Data are compiled into one file for each year. Files beginning with "S" contain salinity; files beginning with "T" contain temperature. Example: T2000.csv contains temperature values for data collected during the summer of 2000.
Each zipped file is about 50 KB. Unzipped files for individual years range from 12 KB to 16 KB. Total data set size is approximately 476 KB.
Southernmost Latitude: 70° N
Northernmost Latitude: 78° N
Westernmost Longitude: 110° E
Easternmost Longitude: 144° E
Data were collected in these expeditions:
1980 - AARI expedition, RV Stvor
1981 - AARI expedition, RV Stvor
1982 - AARI expedition, RV Vladimir Suhosskiy
1983 - AARI expedition, RV Dmitriy Sterligov
1984 - AARI expedition, RV Eduard Tol'
1985 - AARI expedition, RV Vladimir Suhotskiy and RV Akademik Shuleykin
1986 - AARI expedition, RV Akademik Shokalskiy
1989 - AARI expedition, RV Large
1990 - AARI expedition, RV Stvor
1991 - SPASIBA Expedition, RV Yakov Smirnickiy
1993 - Russian-German Expedition TRANSDRIFT I, RV Ivan Kireev
1994 - Russian-German Expedition TRANSDRIFT II, RV Professor Mul'tanovskiy
1995 - Russian-German Expedition TRANSDRIFT III, I/B Kapitan Dranicin
1998 - Russian-German Expedition TRANSDRIFT V, RV Polarstern
1999 - Russian-German Expedition TRANSDRIFT VII, RV Yakov Smirnickiy
2000 - Russian-German Expedition TRANSDRIFT VIII, RV Yakov Smirnickiy
Temperature, salinity
Temperature file for 1980:
130,71,No data
131,71,9.48
132,71,9.48
130,71.25,6.903
131,71.25,7.432
Salinity file for 1980:
130,71,No data
131,71,4.2
132,71,4.2
130,71.25,7.065
131,71.25,7.123
Hydrographicloc.txt:
1980,08,20,140.717,72.900
1980,08,20,140.333,73.100
1980,08,21,140.050,73.267
1980,08,21,140.000,73.500
1980,08,21,139.817,74.167
Data are available for order at NCAR.
Instruments varied on different expeditions (see Processing Steps):
Russian thermometer (type unspecified) with an accuracy of 0.05° C
Russian salinometer (model GM-65) with an accuracy of 0.05 (psu)
CTD (Conductivity, Temperature, Depth) profiler, manufactured by ME-Electronics in Germany (model OTS-4) with an accuracy of 0.01° C and 0.01 (psu)
For expeditions 1 through 9 (see Temporal Coverage) researchers measured the temperature with an unspecified thermometer (Russian make) with an accuracy of 0.05° C. They measured salinity using seawater conductivity measurements (values adjusted to the practical salinity scale) with a Russian salinometer, model GM-65 with an accuracy of 0.05 (psu).
For expedition 10, temperature and salinity measurements were carried out with a CTD of unspecified manufacture.
For expeditions 11 through 16, researchers measured temperature and salinity with a CTD manufactured by ME-Electronics (Germany), model OTS-4 with an accuracy of 0.01° C and 0.01 (psu). The manufacturer calibrated the CTD prior to and following the cruise.
More detailed descriptions of data acquisition and further information on expeditions 11 through 16 are available in References and Related Publications.
1993 Expedition: Karpiy, V., N. Lebedev, and A. Ipatov. 1994. Oceanographic studies. In Russian-German Cooperation: The TRANSDRIFT I Expedition to the Laptev Sea. Berichte zur Polarforschung 151: 16-47.
1994 Expedition: Dmitrenko, I.A., V.I. Karpiy, and N.V. Lebedev. 1995. Oceanographic studies. In TRANSDRIFT II Expedition to the Laptev Sea. Berichte zur Polarforschung 182: 22-70.
1995 Expedition: Dmitrenko, I., L. Timokhov, P. Golovin, and N. Dmitriev. 1997. Oceanographic processes in the Laptev sea during Autumn. In The TRANSDRIFT III Expedition: Freeze-up Studies in the Laptev Sea. Berichte zur Polarforschung 248: 44-61.
2000 Expedition: Kassens, H., Bauch, H., Dmitrenko, I., Drachev, S., Grikurov, G., Thiede, J., and Tuschling, K. 2001. TRANSDRIFT VIII: Drilling in the Laptev Sea in 2000. The Nansen Icebreaker 12: 1, 8-9.
2005-03-24