How useful are mispointing phase SARAL/AltiKa geophysical products for ocean applications? - Observatoire de Paris Access content directly
Journal Articles Advances in Space Research Year : 2023

How useful are mispointing phase SARAL/AltiKa geophysical products for ocean applications?

Suchandra Aich Bhowmick
  • Function : Author
Aditya Chaudhary
  • Function : Author
M. Jishad
  • Function : Author
M. Seemanth
  • Function : Author
Neeraj Agarwal
  • Function : Author
Rashmi Sharma
  • Function : Author
Honey Gupta
  • Function : Author
J.V. Thomas
  • Function : Author
J. Verron
  • Function : Author

Abstract

SARAL/AltiKa, the first microwave altimeter operating at Ka-band frequency, recently completed nine years of operations in orbit. During these years, it has catered to many applications related to operational oceanography, climate sciences, hydrology and cryosphere. More specifically, in oceanography, SARAL has contributed immensely to operational wave and circulation modelling, eddy detection/- tracking, ocean current generation and many more. However, since Feb 2019, SARAL has moved from the drifting phase (DP) to the mispointing phase (MP) due to the malfunctioning of the star sensor of the spacecraft. In this study, we analyse the instrument’s per- formance and its waveforms during its ongoing MP. We find out that during the MP, significant wave height (SWH) measurements are anomalously high between 18 and 24 m, and wind speed measurements are between 16 and 19 m/s. In sea surface height anomaly (SSHA), there is a steady rise in negative values during the MP. In the return waveform, $15% degradation in Brown-type waveforms in the open ocean region is noticed. These changes significantly impact the SARAL applications. Two important applications of wave fore- cast and eddy detection are discussed here as examples. Following this, we also recommend using provided quality flags so that the data can be further explored for various ocean applications.
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Dates and versions

obspm-04184066 , version 1 (21-08-2023)

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Suchandra Aich Bhowmick, Aditya Chaudhary, M. Jishad, M. Seemanth, Neeraj Agarwal, et al.. How useful are mispointing phase SARAL/AltiKa geophysical products for ocean applications?. Advances in Space Research, 2023, ⟨10.1016/j.asr.2023.08.003⟩. ⟨obspm-04184066⟩
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