Gravity corer
Vibro corer
Multiple corer
Rumohr Lot
HAPS corer
Box corer

Gravity corer

The gravity corer is equipped to take cores of 12 cm diameter and up to 5.75 m length (top weight approx. 700 kg). A metal plate mounted below the weights settles on the sediment surface and prevents "overshooting" of the corer in soft mud. This is essential for reproduceable sampling of the sulfate methane transition zone.




The PVC core liners are cut in 1-m sections immediately upon retrieval, capped and stored vertically in a cold room or at in situ temperature. Sub-sampling of the core sections is done by, pushing out the core at one end with a large piston and sub-sampling from the core end with small coring tubes or syringes (with the luer-tip removed)(A in figure below), cutting windows in the side of the core liner with a vibrating saw blade and immediately inserting small coring tubes or syringes (B and C), splitting 1-m sections of the core open for core description and sub-sampling from the exposed half-core (D).

(click on image to enlarge)

Vibro corer

(click on image to enlarge)

Multiple corer

Recovery of the Multi Corer in the Skagerrak during the HE 191 cruise
Reference:

Barnett, P. R. O., J. Watsen, et al. (1984). A multiple corer for taking virtually undisturbed samples from shelf, bathyal, and abyssal sediments. Oceanologica Acta: 399-408.

Rumohr Lot

HAPS corer

The HAPS corer is used for sampling the uppermost 20-30 cm of sediment. The HAPS takes a 13.6 cm diameter core with a mostly undisturbed sediment surface and stratification. This corer is used on some cruises in coastal waters as it is light weight and simple to deploy (see also (http://www.kc-denmark.dk/public_html/p6.htm).




Reference:

Kanneworff, E. and H. Christensen (1986) Benthic community respiration in relation to sedimentation of phytoplankton in the Oresund. Ophelia 26:269-284

Box corer

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