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Title: GFIT2: an experimental algorithm for vertical profile retrieval from near-IR spectra

Journal Article · · Atmospheric Measurement Techniques (Online)
 [1];  [2];  [3];  [3];  [3]
  1. BC Consulting Ltd., Martinborough (New Zealand)
  2. National Institute for Water and Atmospheric Research, Wellington (New Zealand)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States)
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An algorithm for retrieval of vertical profiles from ground-based spectra in the near IR is described and tested. Known as GFIT2, the algorithm is primarily intended for CO2, and is used exclusively for CO2 in this paper. Retrieval of CO2 vertical profiles from ground-based spectra is theoretically possible, would be very beneficial for carbon cycle studies and the validation of satellite measurements, and has been the focus of much research in recent years. GFIT2 is tested by application both to synthetic spectra and to measurements at two Total Carbon Column Observing Network (TCCON) sites. We demonstrate that there are approximately 3° of freedom for the CO2 profile, and the algorithm performs as expected on synthetic spectra. We show that the accuracy of retrievals of CO2 from measurements in the 1.61μ (6220 cm-1) spectral band is limited by small uncertainties in calculation of the atmospheric spectrum. We investigate several techniques to minimize the effect of these uncertainties in calculation of the spectrum. These techniques are somewhat effective but to date have not been demonstrated to produce CO2 profile retrievals with sufficient precision for applications to carbon dynamics. As a result, we finish by discussing ongoing research which may allow CO2 profile retrievals with sufficient accuracy to significantly improve the scientific value of the measurements from that achieved with column retrievals.

Research Organization:
BC Consulting Limited, Martinborough (New Zealand)
Sponsoring Organization:
USDOE
OSTI ID:
1375413
Journal Information:
Atmospheric Measurement Techniques (Online), Vol. 9, Issue 8; ISSN 1867-8548
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (5)

Lower-tropospheric CO 2 from near-infrared ACOS-GOSAT observations journal January 2017
A singular value decomposition framework for retrievals with vertical distribution information from greenhouse gas column absorption spectroscopy measurements journal January 2018
Evaluation of MOPITT Version 7 joint TIR–NIR XCO retrievals with TCCON journal January 2019
Lower-tropospheric CO2 from near-infrared ACOS-GOSAT observations posted_content October 2016
Evaluation of MOPITT Version 7 joint TIR-NIR XCO retrievals with TCCON text January 2019

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