English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Distribution of oxygen in surface sediments from central Sagami Bay, Japan: In situ measurements by microelectrodes and planar optodes

MPS-Authors
/persons/resource/persons210857

Wenzhöfer,  F.
HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Glud, R. N., Wenzhöfer, F., Tengberg, A., Middelboe, M., Oguri, K., & Kitazato, H. (2005). Distribution of oxygen in surface sediments from central Sagami Bay, Japan: In situ measurements by microelectrodes and planar optodes. Deep-Sea Research Part I-Oceanographic Research Papers, 52(10), 1974-1987.


Cite as: http://hdl.handle.net/21.11116/0000-0001-CFF9-E
Abstract
Distributions of oxygen in surface sediments from central Sagami Bay were quantified using an autonomous vehicle carrying both a profiling microelectrode instrument and a planar optode module. Measurements were performed at 16 sites (either by microelectrodes or optodes) along a ∼175 m long transect and in total 45 electrode microprofiles and 6 O2 images (each covering 6.9×5.1 cm of surface sediment) were obtained. The data revealed an extensive small-scale variation of the in situ O2 distribution. The diffusive O2 uptake (DOU) as derived from the microelectrode data varied by a factor >10 with an average value of 2.6±1.6 mmol m−2 d−1 ( ) corresponding to ∼8% of the estimated average primary production for the area. There was no significant difference in the average O2 penetration depth as quantified from the microprofiles and the planar optode images ( ). The O2 penetration depth of the combined dataset varied between 0.5 and 9.2 mm with an average value of 3.9±1.5 mm (). Even though the organic carbon rich sediments of central Sagami Bay may exhibit higher horizontal heterogeneity than normally encountered in deep-sea sediments, the data document that extrapolation from a few in situ data points should be done with caution. A detailed statistical analysis of the spatial autocorrelation in the O2 penetration depth documented that measurements performed less than 2 cm apart were autocorrelated. This implies that the aerobic benthic activity at the investigated site varied in patches with a characteristic size of a few cm. The presented data represent a detailed in situ study on small-scale spatial variability in sediment O2 distribution and document that planar O2 optode images provide a tool to access spatial heterogeneity of natural sediments.