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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.32 [2003] >
IJMS Vol.32(3) [September 2003] >
| Title: | Temperature error in digital bathythermograph data |
| Authors: | Pankajakshan, Thadathil
Reddy, G. V.
Ratnakaran, Lasitha
Sarupria, J. S.
Babu, V. Ramesh |
| Keywords: | Digital bathythermograph
Indian Ocean
temperature error
systematic bias |
| Issue Date: | Sep-2003 |
| Publisher: | CSIR |
| Abstract: | Simultaneous Digital Bathythermograph (DBT) and Nansen Cast data collected during two cruises of R.V. Gaveshani (GV-117 and GV-118) and archived in Indian Oceanographic Data Centre (IODC) are used to determine existing temperature errors in DBT. The resulting mean error for DBT data from the GV-117 cruise varies from -0.5 to - 1 oC, while it varied between -0.3 and -0.6 oC for data from cruise GV-118. For both the data sets, the error shows consistently negative bias from surface to 800 m depth, however there is no apparent or measurable systematic dependence of the error on depth. Considering the given temperature accuracy of 0.05 oC, the observed DBT error, varying from -0.3 to -1 oC, is significant and such offsets should be removed from DBT archives. It is found that a corrective measure of +0.5 oC, equivalent to the mean surface offset obtained from two cruises, can considerably reduce the temperature error at all DBT depths. |
| Page(s): | 234-236 |
| ISSN: | 0379-5136 |
| Source: | IJMS Vol.32(3) [September 2003]
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