01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-06-0278 |
| Title of Abstract | Validation of Sensor-based Dissolved Oxygen measurements from the BIOARGO Floats in the Arabian Sea |
| Authors | Damodar M. Shenoy*, Atharva M. Ther, J. Pavan Kumar, R.U.V.N. Satish, T.V.S. Udaya Bhaskar, I. Suresh, Siby Kurian, Midhuna Santh |
| Organisation | CSIR-National Institute of Oceanography |
| Address | Chemical Oceanography Division CSIR-National Institute of Oceanography, Dona Paula, India Pincode: Goa 403004 E-mail: dmshenoy@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The Arabian Sea contains one of the most significant oxygen minimum zones (OMZ) in the world, attributed to monsoonal productivity and restricted ventilation. Although numerous important programs have been implemented in this basin to comprehend its hydrographic features and biogeochemical processes, there has consistently been a lack of biogeochemical data on both spatial and temporal scales necessary to assess long-term changes and the impacts of climate change. The BIOARGO program was launched to address this gap. In addition to recording depth, temperature, and salinity, BIOARGO floats measure dissolved oxygen, fluorescence, and backscatter. Since 2012, a total of 44 floats have been deployed in the Arabian Sea, of which 15 remain active. While the data from these floats undergo standard quality control checks and corrections as established by the Biogeochemical Argo team, there has been no systematic validation against water-column measurements. This study is aimed to fill that gap by comparing the dissolved oxygen (DO) data from the recent time-series programmes of CSIR-NIO with the BIOARGO DO data. The depth-wise patterns were broadly consistent between BIOARGO and sampled DO, though differences were noted in the absolute values. Differences were noted in the surface (mixed layer) and deep-water DO, whereas the oxycline (thermocline) and OMZ DO values showed good agreement. Importantly, individual floats displayed consistent variations over their operational times, suggesting that corrections could be applied to improve data accuracy. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Arabian Sea, BIOARGO, dissolved oxygen, float, oxygen minimum zone, productivity |
| For Awards | no |