Acoustic surveying of pack-ice seals

Acoustic surveying
Data from four acoustic surveys from the Aurora Australis from 1996-10-05 to 1996-10-31; 1997-10-09 to 1997-10-29; 1997-12-08 to 1998-01-06; and 1999-12-04 to 2001-01-16.

Sonobouys deployed off the back of the ship, half an hour recording duration samples made concurrently with Colin Southwells visual surveys. Numbers of leopard seal calls audible from recordings measured by acoustic analysis.

The fields in this dataset are:
Tape # = the tape number and date
Recording # = Recording number
Buoy # = Sonobuoy number
Buoy Freq = Sonobuoy frequency
Longitude S = Longitude
Decimal Longitude S = Decimal Longitude
Latitude E = Latitude
Decimal Latitude E = Decimal Latitude
GMT = Greenwich Mean Time
Local time = Local Time
Serial Time = dd:mm:yy hh:mm
Ship Speed Kts
ICE Cover (/10) = Ice Cover in tenths
Ice % cover = Percentage of Ice Cover

Thick Ice: Ice Thickness 0 = 0; 1less than 2 cm; 2 = 2cm to 0.25m; 3= 0.25m to 0.5m; 4 = 0.5m - 1m; 5 greater than 1.0 m Ice Type: 1 = no information; 2 = grease or pancake; 3 = brash; 4 = floes first year; 5 = multiyear floes; 6 = first year rafted floes; 7 = multiyear rafted floes; 8 = mixed brash and 1st year floes; 9 = mixed brash and multiyear floes; 10 = icebergs; 11 = icebergs and brash; 12 = icebergs and 1st year floes; 13 = icebergs and multiyear floes; 14 = compacted pack ice; 15 = iceshelf; 16 = other; 17 = fast ice.

Floe Width: 1 = less than 3 m; 2 = 3 - 10 m; 3 = 10 - 50m; 4 = 50 -100 m; 5 greater than 100 m. Weather: 1 = blue sky (0-20% cloud); 2 = partly cloudy (21-80%); 3 = cloudy (81-99%); 4 = overcast (100%); 5 = rain; 6 = mist; 7 = fog; 8 = fog patches; 9 = drizzle; 10 =snow; 11 = snow fog; 12 = rain fog.

Algae: 1 = clear; 2 = slight colour; 3 = medium colour; 4 = dark brown patches; 5 = all dark brown

Water Depth m
Wind Speed Kts
Wind Direction
Air temp degrees C
Rec Time = Duration of the recording made
Gain = Recording gain on the amplifier

Mammal Sounds? = Other mammal sounds. CS = unknown origin chain-saw like sound; P5/P6 = unknown origin pulsed sounds; NSL = unknown origin appears to be a new leopard seal sound; Wd = Weddell; LS = Leopard; KW = Killer Whale; RS = Ross

LS Calls Total = Total number of leopard seal calls
D = Total Low Descending trills
H = Total High Double trills
L = Total Low Double trills
M = Total Medium Single trills
O = Total Hoots with Single trills
Juv LS = Total Juvenile Leopard seal calls
NLS = Total New Leopard Seal Calls
CS = Total Chain Saw Calls
RS = Total Ross Seal Calls
Wd = Total Weddell seal Calls
P2-P5 = Total Pulsed calls