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Effect of Structural Uncertainty in Passive Microwave Soil Moisture Retrieval Algorithm.

Lanka Karthikeyan1,2,3, Ming Pan3, Dasika Nagesh Kumar2

  • 1Centre of Studies in Resources Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India.

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Summary
This summary is machine-generated.

Structural indeterminacy in radiative transfer models (RTM) creates uncertainty in passive microwave soil moisture (SM) retrieval. This study presents a new solution to improve concurrent retrieval of vegetation optical depth (VOD) and SM.

Keywords:
AMSR-EVODequifinalitypassive microwaveradiative transfer modelretrieval algorithmsoil moistureuncertainty

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Area of Science:

  • Earth Science
  • Remote Sensing
  • Microwave Radiometry

Background:

  • Passive microwave sensors are crucial for retrieving soil moisture (SM) using brightness temperatures (T).
  • Vegetation optical depth (VOD) is a critical parameter in radiative transfer models (RTM) for SM retrieval.
  • Existing algorithms often use τ-ω models, which can yield multiple solutions and introduce uncertainty.

Purpose of the Study:

  • To investigate the structural indeterminacy in τ-ω models for passive microwave SM retrieval.
  • To present a new analytical solution for concurrent VOD and SM retrieval.
  • To assess the impact of structural uncertainty on global VOD and SM retrievals.

Main Methods:

  • Analytical inversion of the RTM using dual-polarized T measurements.
  • Application of three analytical solutions (one new, two existing) within a fixed RTM framework.
  • Utilizing X-band Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) T data for global-scale retrieval.

Main Results:

  • Structural indeterminacy in τ-ω models significantly impacts VOD and SM retrievals.
  • The new analytical solution was applied alongside existing methods for comparison.
  • Noticeable effects on VOD and SM retrieval accuracy were observed due to inherent model uncertainties.

Conclusions:

  • The identified structural indeterminacy in RTM contributes to uncertainty in passive microwave SM retrievals.
  • Further research into retrieval algorithm sensitivity is warranted.
  • Improved analytical solutions are needed to mitigate uncertainty in VOD and SM estimations.