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A pump freeze corer for recent sediments
Author(s) -
Renberg Ingemar,
Hansson Hans
Publication year - 1993
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1993.38.6.1317
Subject(s) - coring , ice wedge , geology , sediment , wedge (geometry) , dry ice , oceanography , geomorphology , materials science , permafrost , composite material , drilling , metallurgy , optics , physics
A new freeze corer consists of a thermos, a pump unit, and a thin wedge‐shaped freeze container. Methanol, or ethanol, and dry ice are filled in the thermos. The cold alcohol is pumped down into the freeze wedge and the sediment freezes to the outside. Compared to previous freeze corers, this one causes less disturbance of sediment stratigraphy and gives thicker crusts of frozen sediments. The current corer device is designed to take cores (<50 cm long) of recent sediments from ice‐covered lakes but could be modified for coring from boat. Moreover, the pump concept could allow freeze coring in very deep lakes or on the continental shelf (<200 m).