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

Ronnie N. Glud; Anders Tengberg; Michael Kühl; Per O.J. Hall; Ingo Klimant

doi:10.4319/lo.2001.46.8.2073

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

Ronnie N. Glud^*, Anders Tengberg, Michael Kühl, Per O.J. Hall, Ingo Klimant

^*Corresponding author af dette arbejde

103 Citationer (Scopus)

Abstract

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.

Originalsprog	Engelsk
Tidsskrift	Limnology and Oceanography
Vol/bind	46
Udgave nummer	8
Sider (fra-til)	2073-2080
Antal sider	8
ISSN	0024-3590
DOI	https://doi.org/10.4319/lo.2001.46.8.2073
Status	Udgivet - 1 jan. 2001

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title = "An in situ instrument for planar O2 optode measurements at benthic interfaces",

abstract = "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 {\O}resund, 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.",

author = "Glud, {Ronnie N.} and Anders Tengberg and Michael K{\"u}hl and Hall, {Per O.J.} and Ingo Klimant",

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T1 - An in situ instrument for planar O2 optode measurements at benthic interfaces

AU - Glud, Ronnie N.

AU - Tengberg, Anders

AU - Kühl, Michael

AU - Hall, Per O.J.

AU - Klimant, Ingo

PY - 2001/1/1

Y1 - 2001/1/1

N2 - 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.

AB - 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.

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