Friday 8 February 2008 à 11:17

Data for the Umitaka Maru

Par Graham Hosie (CEAMARC Leader) and Takashi Ishimaru (Voyage Leader)

Position of the icebreaker :
- Latitude : - 66° 17.4 S
- Longitude :142° 43.2 E
Heading : on station
Current speed : on station

Distance in last 24 hours : 52 Nautical miles
Distance to next waypoint : 16 Nautical miles
Weather conditions : Clear and sunny, few clouds, very good visibility to the horizon, wind 14 knots from SSW.
Air temperature : - 9.4° C
Sea temperature : 0.6°C
Sea conditions : Slight sea, minimal swell, 1-2 m wave average
Remarks
Completed 2 stations in the last 24 hours and half way through another at present. Both the RMT and IYGPT nets returned high abundances of larvae and juveniles of Pleuragramma fish. Typically, the new larvae and the one year old group are found in surface waters and older specimens going deeper with age. The third and fourth year groups are common in the 200 m trawls and we need to go to 500m to catch the adults. The fish look somewhat like a sardine or pilchard although they are commonly called Antarctic herring. These fish are an important food item for the higher predators such as Adelie and Emperor penguins. The high definition video camera on the VPR captured excellent images of the young Pleuragramma larvae darting about feeding. The wind continues to blow off the continent, bringing very cold air. People new to the Antarctic quickly understood the meaning of wind chill. In the afternoon, it was sunny with a temperature of -4 and almost no wind. It was quite pleasant on deck. By late evening, the temperature dropped a few degrees and the wind increased to over 20 knots giving a -25 wind chill, and making work on deck difficult. Nets are freezing and need thawing before deployment. Samples are starting to freeze before processing.
Regards Graham and Takashi

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