Record Details

Drift in salinity data from Argo profiling floats in the Sea of Japan

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Drift in salinity data from Argo profiling floats in the Sea of Japan
 
Creator Pankajakshan, T.
Bajish, C.C.
Behera, S.
Gopalakrishna, V.V.
 
Subject salinity
drifters
data processing
method
 
Description In drift analysis of salinity sensors, one major problem is the difficulty in delineating sensor drift from water mass changes. In the present study, a new method is proposed for finding sensor drift that is free from water mass changes. The efficiency of this new method in finding out possible drift in the Argo salinity is demonstrated in the Sea of Japan (SOJ) by using the "near-linear" subsurface salinity structure of the SOJ. The new method is based on the time–space decorrelation scale. The salinity difference between two neighboring observations within the time– space decorrelation scale (SALD) is used to find out possible drift. Neighboring observations within the time–space decorrelation scale are referred to as matchups. The SALD derived from matchups between Argo floats and shipboard CTD observations from the SOJ shows linear drift. Although all four selected floats (5 yr completed) from the SOJ show linear drift (less than 0.001 PSS yr sup(-1)), the drift alone is not so significant to affect the objective of the Argo program in understanding climate variability. In the SOJ, SALD identified salinity error other than drift in good quality data that are flagged by the Argo delayed-mode quality control (ADMQC) method. Therefore, SALD could be used as an effective additional tool in the Argo data quality control. To examine the applicability of SALD in open ocean regions, in addition to confined basins such as SOJ, SALD was applied successfully to detect salinity error in Argo data from the subtropical North Pacific (SNP).
 
Date 2012-02-03T07:03:02Z
2012-02-03T07:03:02Z
2012
 
Type Journal Article
 
Identifier Journal of Atmospheric and Oceanic Technology, vol.29; 2012; 129-138
http://drs.nio.org/drs/handle/2264/4010
 
Language en
 
Rights Copyright [2011] American Meteorological Society. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher American Meteorological Society