Source	UK76	UK87	UK91
Cruise	USS Gurnard	HMS Superb
Region	Beaufort Sea	Fram Strait, North Pole	Fram Strait, North Pole
Institution	Scott Polar Research Institute, University of Cambridge	Scott Polar Research Institute, University of Cambridge	Scott Polar Research Institute, University of Cambridge
Investigator	Dr. Peter Wafhams	Dr. Peter Wafhams	Dr. Peter Wafhams
Contact email	pw1@cam.ac.uk	pw1@cam.ac.uk	pw1@cam.ac.uk
Project web site	NSIDC Submarine Data	NSIDC Submarine Data	NSIDC Submarine Data
Documentation	NSIDC Documentation	NSIDC Documentation	NSIDC Documentation
Method	Uppward Looking Sonar	Uppward Looking Sonar	Uppward Looking Sonar
Measurement	Draft	Draft	Draft
Recorder	UKDIPS	Analog/Hand-digitized	Analog/Hand-digitized
Point data location	NSIDC Documentation	NSIDC Documentation	NSIDC Documentation
Lat min	70.592	72.831	77.046
Lat max	75.265	89.934	88.522
Lon min	-154.242	-190.058	-15.742
Lon max	-138.251	177.927	40.138
Start date	7-May-76	8-Jun-87	11-May-91
Start year	1976	1987	1991
Start day	98	128	101
End date	10-May-76	26-Jun-87	26-May-91
End year	1976	1987	1991
End day	101	146	116
Number of point samples	1349919	4852720	4852720
Number of clusters	27	109	40
PDF number of bins	300	300	300
PDF bin width	0.01	0.01	0.01
PDF first center	0	0	0
PDF sample intervals (m)	1.00	1.00	1.00
Mean depth (m)
Min depth (m)
Max depth (m)
Mean Spd (knots)	9.9	10.9	5.6
Min Spd (knots)	6.3	2.4	0.9
Max Spd (knots)	11.7	24.9	16.1
Total sample length (km)	1350	4852	1545
Processing Notes	The 1976 SPRI data are from USS Gurnard in the Beaufort Sea with approximate latitude/longitude coordinates supplied. Centroids were not determined. An experimental narrow-beam sonar was used (Wadhams and Horne, 1980).	The 1987 SPRI data are from the HMS Superb in the Greenland Sea & Eurasian basin. Data are in two legs (a and b). Segments a03 and b46 have insufficient data for analysis. For segments b45, b55, b58, b60 and b61 the ice regime is not conducive to standard analyses; therefore, these segments were processed with level ice slope of 0.05 and minimum lead width set to zero.