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Long-term performance of Aanderaa optodes and sea-bird SBE-43 dissolved-oxygen sensors bottom mounted at 32 m in Massachusetts Bay

Journal of Atmospheric and Oceanic Technology

By:
, ,
DOI: 10.1175/JTECH2078.1

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Abstract

A field evaluation of two new dissolved-oxygen sensing technologies, the Aanderaa Instruments AS optode model 3830 and the Sea-Bird Electronics, Inc., model SBE43, was carried out at about 32-m water depth in western Massachusetts Bay. The optode is an optical sensor that measures fluorescence quenching by oxygen molecules, while the SBE43 is a Clark polarographic membrane sensor. Optodes were continuously deployed on bottom tripod frames by exchanging sensors every 4 months over a 19-month period. A Sea-Bird SBE43 was added during one 4-month deployment. These moored observations compared well with oxygen measurements from profiles collected during monthly shipboard surveys conducted by the Massachusetts Water Resources Authority. The mean correlation coefficient between the moored measurements and shipboard survey data was >0.9, the mean difference was 0.06 mL L−1, and the standard deviation of the difference was 0.15 mL L−1. The correlation coefficient between the optode and the SBE43 was >0.9 and the mean difference was 0.07 mL L−1. Optode measurements degraded when fouling was severe enough to block oxygen molecules from entering the sensing foil over a significant portion of the sensing window. Drift observed in two optodes beginning at about 225 and 390 days of deployment is attributed to degradation of the sensing foil. Flushing is necessary to equilibrate the Sea-Bird sensor. Power consumption by the SBE43 and required pump was 19.2 mWh per sample, and the optode consumed 0.9 mWh per sample, both within expected values based on manufacturers’ specifications.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Long-term performance of Aanderaa optodes and sea-bird SBE-43 dissolved-oxygen sensors bottom mounted at 32 m in Massachusetts Bay
Series title:
Journal of Atmospheric and Oceanic Technology
DOI:
10.1175/JTECH2078.1
Volume
24
Issue:
11
Year Published:
2007
Language:
English
Publisher:
American Meteorological Society
Contributing office(s):
Coastal and Marine Geology Program
Description:
12 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1924
Last page:
1935
Number of Pages:
12
Country:
United States
State:
Massachusetts
Other Geospatial:
Massachusetts Bay