Forskning ved Københavns Universitet - Københavns Universitet

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An in situ instrument for planar O2 optode measurements at benthic interfaces

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  • Ronnie N. Glud
  • Anders Tengberg
  • Kuhl, Michael
  • Per O.J. Hall
  • Ingo Klimant

A new in situ instrument for two-dimensional mapping of oxygen in coastal sediments is presented. The measuring principle is described, and potential mechanical disturbances, solute and particle smearing associated with the measurements, and calibration routines are evaluated. The first in situ measurements obtained in two different benthic communities are presented. In a shallow photosynthetic sediment (1 m of water depth), an extensive horizontal and temporal variation in the O2 distribution caused by benthic photosynthesis and irrigating fauna was resolved. Repetitive planar optode measurements performed along a transect in central Øresund, Denmark (17 m of water depth) revealed a positive correlation between the apparent O2 penetration depths (OP) measured with a lateral distance <5.0 mm, whereas OP measured with a larger horizontal distance (up to 50 m) were not correlated. Consequently, the OP varied in patches with a characteristic size of 5.0 mm. The instrument described is a powerful new tool for in situ characterization of spatiotemporal variations in O2 distributions within benthic communities. The instrument can be adapted for use at full ocean depths, e.g., on deep-sea landers or remote operating vehicles.

OriginalsprogEngelsk
TidsskriftLimnology and Oceanography
Vol/bind46
Udgave nummer8
Sider (fra-til)2073-2080
Antal sider8
ISSN0024-3590
DOI
StatusUdgivet - 1 jan. 2001

ID: 201681555