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Several laminated cores were retrieved last year (1998) from the lake. Preliminary study of those core confirms the potential of retrieving of good quality varved records, especially in the anoxic deep distal basin. This year 's goal was to retreive the longest possible cores from the distal basin.
The field campaign at Sawtooth lasted from the May 25th till June 2. The coring team was composed of Mark Abbott, Ray Bradley, Pierre Francus and Whit Patridge. Heavy coring material was shipped to Sawtooth by two Twin Otters from the Polar Continental Shelf Project (Resolute), our logistical supporter.
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We successfully used a submersible vibracorer from Rossfelder Corporation. The main issue was to dig a hole in the ice, big enough to allow the lowering of the coring device in the lake water. This year, ice thickness was 2.5 meters. We finally succeed combining Finnish technology (Jaä Saha), and a lot of efforts (mainly by Whit !).
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Using the submersible vibracorer, we got 4 long cores. We also got 3 short Glew cores, retreiving the water-sediment interface at the coring sites.
site coordinates core type water depth # core length depth topographic sill 79º20'50.39"N submersible
vibracorer 62.1m SS99-6-1 3.46 m 0 - 173 cm . 83º53'43.77"W . . . . . topographic sill . concrete
vibracorer 62.05 m SS99-6-2 1.3 m . . topographic sill . Glew 61.85 m SS99-6-3 28 cm . . topographic sill . Glew . SS99-6-4 15 cm . . deep distal basin 79º21'00.70"N submersible
vibracorer 80.45 m SS99-10-1 4.45 m 0 - 150 cm . 83º56'11.48"W . . . . 150-300 cm . . . . . . 300-445cm deep distal basin 79º20'58.89"N submersible
vibracorer 80.62 m SS99-10-6A 4.58 m 0 - 110 cm . 83º56'12.65"W . . . . 110-284 cm . . . . . . 284-458 cm deep distal basin . submersible
vibracorer 80.62 m SS99-10-6B 4.63 m 0 - 175 cm . . . . . . 175-325 cm . . . . . . 325-463 cm deep distal basin . Glew . SS99-10-5 . . . deep distal basin . Glew 80.40 m SS99-10-7 43 cm . .
The cores are continuously laminated down core. Subsampling is now being undertaken.
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Climatology Lab | Department of Geosciences | University of Massachusetts
Last modification: 21 july 1999
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