EGU21-4862, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-4862
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Validation of sea surface heights from satellite altimetry along the Indian coast

Milaa Murshan1, Balaji Devaraju2, Nagarajan Balasubramanian3, and Onkar Dikshit4
Milaa Murshan et al.
  • 1Indian Institute of Technology Kanpur, Civil Engineering, Kanpur, India (milaa@iitk.ac.in)
  • 2Indian Institute of Technology Kanpur, Civil Engineering, Kanpur, India (dbalaji@iitk.ac.in)
  • 3Indian Institute of Technology Kanpur, Civil Engineering, Kanpur, India (nagaraj@iitk.ac.in)
  • 4Indian Institute of Technology Kanpur, Civil Engineering, Kanpur, India (onkar@iitk.ac.in)

Satellite altimetry provides measurements of sea surface height of centimeter-level accuracy over open oceans. However, its accuracy reduces when approaching the coastal areas and over land regions. Despite this downside, altimetric measurements are still applied successfully in these areas through altimeter retracking processes. This study aims to calibrate and validate retracted sea level data of Envisat, ERS-2, Topex/Poseidon, Jason-1, 2, SARAL/AltiKa, Cryosat-2 altimetric missions near the Indian coastline. We assessed the reliability, quality, and performance of these missions by comparing eight tide gauge (TG) stations along the Indian coast. These are Okha, Mumbai, Karwar, and Cochin stations in the Arabian Sea, and Nagapattinam, Chennai, Visakhapatnam, and Paradip in the Bay of Bengal. To compare the satellite altimetry and TG sea level time series, both datasets are transformed to the same reference datum. Before the calculation of the bias between the altimetry and TG sea level time series, TG data are corrected for Inverted Barometer (IB) and Dynamic Atmospheric Correction (DAC). Since there are no prior VLM measurements in our study area, VLM is calculated from TG records using the same procedure as in the Technical Report NOS organization CO-OPS 065. 

Keywords— Tide gauge, Sea level, North Indian ocean, satellite altimetry, Vertical land motion

How to cite: Murshan, M., Devaraju, B., Balasubramanian, N., and Dikshit, O.: Validation of sea surface heights from satellite altimetry along the Indian coast, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-4862, https://doi.org/10.5194/egusphere-egu21-4862, 2021.

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