Date: Sun, 19 Jan 2003 07:44:08 +0000 To: lterpalpi@icess.ucsb.edu From: Robin Ross Subject: second high density grid Cc: fraserbi@palmer.usap.nsf.gov, ducklohu@lmg.usap.gov, iannuzzi@ldeo.columbia.edu, kozlowwe@lmg.usap.gov, geiszhe@lmg.usap.gov Hello, The weather treated us right and we managed to get both high density grids done before leaving for the outer stations of the 400.* line. At 2205 (GMT) on 19 Jan we have 2200 m of wireout at 400.180. The grid plan for the second high density grid has a different 'look' than that for the baseline HD1 with its 2.5 km resolution and rectangular layout. We based the transect plan on the chart with dots for penguin locations that Bill and Donna sent to us the afternoon of 17 Jan. Two transmittors had been on a series of birds for several weeks, and 4 others had been on penguins for a few days. In this case I think 'few' means 4 d, but I am not totally clear about that. Heidi, Brett and I went up to the bridge and looked at the distribution of the 'locations', and it looked to us like the vast majority of the locations were in Wylie Bay, and between the shore and the 10 km picket line. The furthest south one was at 64° 51.6'S, and our PL10.175 is 64° 51.65'S. Also most locations were between two lines, one drawn from Dream I past the Joubins, and one from Gamage Point to Outcasts. The Captain looked at the charts with us, to help figure out what was easy navigation or something we had done before so that we could do the 4.5+ kt survey speed. Lots of shallow rocky areas in that region. Ultimately we decided do the survey as 'half circle' transect lines with Torgersen I as the center. We started just to the east of the Joubins with simultaneous bird and acoustics, moved in to the 10 km picket line start point in Wylie Bay and did a CTD cast near Dream Island. Then we did the simultaneous bird and acoustics along the 10 km picket line out to the 205 degree point, moved in to a 7 km (from Torgersen) picket parallel to the 10 km, heading back to Wylie Bay and Halfway Island. Then to the inner most point on the 3.7 km picket where we did a CTD cast (close to Station J). We did the entire 3.7 km picket, moved out to the 10 km picket on the Biscoe Bay side and did the 10 km picket back to the 205 degree point where we finished with a CTD cast. There were several XCTDs along the way, but we will run out so we were conservative. None of that probably made any sense unless you have a map of the 3.7 and 10 km picket lines in hand! We started at 0900 and ended about 2000, trying to have good daytime for the bird obs. Prior to the high density grids we did 3 net tows in the Wylie Bay region - two tows were sparse, but the third, a target tow, netted us 3 halibut tubs full of krill with a few salps sprinkled here and there. We are back on schedule to visit Rothera on 25 january - the HMS Endeavour paid her visit earlier than expected so there is no longer a conflict. We are also a day behind due to the storm, so we hope not to lose any more time. cheers, Robin