Alfred Wegener Institute - Greenland Sea
AWI Moored ULS Data, Greenland Sea and Fram Strait, 1991-2002
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Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany |
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Dr. Hannalore Witte and Dr. Eberhard Fahrbach, AWI |
Principal contacts |
Dr Wolfgang Dierking, AWI, email: Wolfgang.Dierking at awi.de |
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http://nsidc.org/data/docs/noaa/g02139_aws_moored_uls_data/index.html |
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Upward Looking Sonar on bottom anchored moorings |
Location |
Greenland Sea and Fram Strait at 11 different sites |
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1991-2002 |
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Data were processed and calibrated by AWI. Statistical summaries were computed and reformatted by R. Lindsay, PSC from the 5-minute point data. Dr. Dierking notes that one problem with the data sets available at NSIDC is that a bias factor was applied to account for the width of the sonar beam. However, only sort of an average value was used that was based on a limited comparison of ice thickness values derived from ULS and obtained from drilling. Since we think that such a value is not generally valid we decided not to include such a bias correction in our future data sets, leaving the choice of handling this problem to the end-user. |
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1.06e+06 point values, 139 monthly averages |
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summary from the NSIDC web site (pdf, dated September 2005) Harms, S., Fahrbach, E., Strass, V. 2001. Sea ice transports in the Weddell Sea. Journal of Geophysical Research 106 (C5): 9057-9073. R.E. Moritz. 2004. Upward Looking Sonar ULS Mark-2 User Documentation. This infomal document is an instruction manual updated and provided with each APL ULS when shipped for deployment. |
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ftp://sidads.colorado.edu/DATASETS/NOAA/G02139/ |
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Witte, H., and E. Fahrbach. 2005. AWI Moored ULS Data, Greenland Sea and Fram Strait, 1991-2002. Boulder, CO: National Snow and Ice Data Center/World Data Center for Glaciology. Digital media. |
Map of mooring locations with bathymetry
Monthly boxplots of ice draft for each mooring
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Box plots show the median (black) and the 5, 25, 75, and 95th percentile values for each month. The colors show the month of the year. Click on an image to see an enlarged view.
List of Moorings from the NSIDC documentation
Start |
End |
Latitude (degrees, minutes) |
Longitude (degrees, minutes) |
Mooring |
Instrument |
Water Depth |
Instrument Depth |
Data File Names |
Data directory |
August 1991 |
November 1992 |
75 00'N |
12 40'W |
AWI411 |
APL26 |
1002m |
48m |
aug91.raw, aug91.ice, aug91.mod...nov92.raw, nov92.ice, nov92.mod; stat26-91-92.stat |
uls26-91-92 |
August 1992 |
December 1992 |
74 52'N |
11 43'W |
AWI412-2 |
APL31 |
2362m |
50m |
aug92.raw, aug92.ice, aug92.mod...dez92.raw, dez92.ice, dez92.mod; stat31-92.stat |
uls31-92 |
August 1993 |
July 1994 |
74 53'N |
07 38'W |
AWI414-2 |
APL32 |
3425m |
70m |
aug93.raw, aug93.ice, aug93.mod...jul94.raw, jul94.ice, jul94.mod; uls32-93-94.stat |
uls32-93-94 |
July 1994 |
October 1995 |
74 58'N |
12 59'W |
AWI410-2 |
APL49 |
413m |
73m |
jul94.raw, jul94.ice, jul94.mod...okt95.raw, okt95.ice, okt95.mod; uls49-94-95.stat
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uls49-94-95 |
August 1997 |
September 1998 |
79N |
02W |
V10-1 |
APL32 |
2600m |
58m |
aug97.raw, aug97.ice, aug97.mod...sep98.raw, sep98.ice, sep98.mod; uls32-97-98.stat |
uls32-97-98 |
September 1998 |
September 1999 |
79N |
02 03'W |
V10-2 |
APL47 |
2609m |
54m |
sep98.raw,sep98.ice, sep98.mod...sep99.raw, sep99.ice, sep99.mod; uls47-98-99.stat |
uls47-98-99 |
September 1999 |
August 2000 |
79N |
02 03'W |
V10-3 |
APL25 |
2582m |
53m |
sep99.raw, sep99.ice, sep99.mod...aug00.raw, aug00.ice, aug00.mod; stat25-99-00.stat
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uls25-99-00 |
October 1999 |
September 2000 |
74 25'N |
10 15'W |
AWI419-1 |
APL32 |
3229m |
63m |
oct99.raw, oct99.ice, oct99.mod ...sep00.raw, sep00.ice, sep00.mod;uls32-99-00.stat |
uls32-99-00 |
August 2000 |
October 2001 |
79 2'N |
02 03'W |
F10-4 |
APL48 |
2554m |
67m |
aug00.raw, aug00.ice, aug00.mod, ...oct01.raw, oct01.ice, oct01.mod, uls48-00-01.stat |
uls48-00-01 |
September 2000 |
September 2001 |
74 24'N |
10 12'W |
AWI419-2 |
APL31 |
3160m |
65m |
sep00.raw, sep00.ice, sep00.mod...sep01.raw, sep01.ice, sep01.mod,uls31-00-01.stat |
uls31-00-01 |
September 2001 |
September 2002 |
74 24'N |
10 12'W |
AWI419-3 |
APL47 |
3160m |
82m |
sep01.raw, sep01.ice, sep01.mod...sep02.raw, sep02.ice, sep02.mod, uls47-01-02.stat |
uls47-01-02 |