Alfred Wegener Institute - Greenland Sea

AWI Moored ULS Data, Greenland Sea and Fram Strait, 1991-2002

Organization

Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Authors

Dr. Hannalore Witte and Dr. Eberhard Fahrbach, AWI
Principal contacts
Dr Wolfgang Dierking, AWI, email: Wolfgang.Dierking at awi.de

Data web site

http://nsidc.org/data/docs/noaa/g02139_aws_moored_uls_data/index.html

Methodology

Upward Looking Sonar on bottom anchored moorings
Location
Greenland Sea and Fram Strait at 11 different sites

Time interval

1991-2002

Data processing notes

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.

Number of samples

1.06e+06 point values, 139 monthly averages

Documentation

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.

Point data

ftp://sidads.colorado.edu/DATASETS/NOAA/G02139/

Citation

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

Map of AWI Greenland Sea mooring locations with bathymery

Monthly boxplots of ice draft for each mooring

mooring  box plot mooring  box plot mooring  box plot
mooring  box plot mooring  box plot mooring  box plot
mooring  box plot mooring  box plot mooring  box plot
mooring  box plot mooring  box plot  

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

 

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

 

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