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This chapter focuses on the evaluation of DOAS spectra. It introduces linear and non-linear least squares fitting methods and describes how these are combined in current DOAS analysis procedures and softwareSoftware. A review of the treatment of uncertainties in the fitting methods leads to a discussion of the DOAS retrieval errors and detection limitsDetection limit. Systematic errors receive special attention as they can create a challenge for the DOAS analysis. Reference spectra for trace gases and solar light are important components of the DOAS analysis approach and the chapter provides detailed instruction on their computation. Further topics include procedures of choosing an optimal spectral interval (Vogel-Sihler-Plot) and the Principal Component Analysis as tool for DOAS retrievals.

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Evaluation of DOAS Spectra, Sensitivity, and Detection Limits

  • 章节

  • 发表日期：

    2026年

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  • Ulrich Platt,
  • Jochen Stutz

摘要

This chapter focuses on the evaluation of DOAS spectra. It introduces linear and non-linear least squares fitting methods and describes how these are combined in current DOAS analysis procedures and softwareSoftware. A review of the treatment of uncertainties in the fitting methods leads to a discussion of the DOAS retrieval errors and detection limitsDetection limit. Systematic errors receive special attention as they can create a challenge for the DOAS analysis. Reference spectra for trace gases and solar light are important components of the DOAS analysis approach and the chapter provides detailed instruction on their computation. Further topics include procedures of choosing an optimal spectral interval (Vogel-Sihler-Plot) and the Principal Component Analysis as tool for DOAS retrievals.