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|Authors: ||Lo Bue, Nadia*|
|Title: ||Anomalies of oxygen measurements performed with Aanderaa optodes|
|Editors: ||Làzaro, Antoni Mànuel; Technical University of Catalonia (UPC)|
|Issue Date: ||22-Sep-2011|
|Abstract: ||Four sets of measurements performed between 2005 and 2010 in the deep central Atlantic, and in
deep Mediterranean Sea, and the Arctic Ocean revealed a strange performance of Aanderaa Optode
3830 sensors mounted on RCM11 current meters in low current regimes (current speeds > 10 cm s-
All oxygen data sets collected during these deployments showed significant drops of oxygen (of the
order of 50-100 ìmol/l) affecting the Optode data stability in low hydrodynamic conditions (fig.1).
High correlations between all acquired parameters (i.e. temperature, turbidity, speed and direction
of currents) allowed verifying that no unusual event perturbed the mooring areas during the periods
of acquisition, although natural events responsible of so abrupt, short and intense oxygen variations
can’t be easily found.
Despite the well-known performance of the Aanderaa Optodes, these experiences suggested that the
data acquired by optodes installed on RCM11s could not be always reliable, especially in low
energy systems (typical for the deep ocean) and that current speeds should always be considered in
order to verify the reliability of the data recorded.
A series of test in controlled water condition was performed in order to better understand eventual
sensor dependence on speed current variations and to evaluate sensor stability in quasi-stationary
|Appears in Collections:||01.03.06. Instruments and techniques|
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