Spaceborne measurements of atmospheric CO2 by high‐resolution NIR spectrometry of reflected sunlight: An introductory study

Kuang, Zhiming; Margolis, J. S.; Toon, G. C.; Crisp, David; Yung, Yuk L.

doi:10.1029/2001gl014298

Cited by 129 publications

(142 citation statements)

References 10 publications

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“…8. These results corroborate the findings of Kuang et al (2002) using simulations. They also investigated the achievable XCO 2 precisions as a function of the total particle OD and found that, as OD increases from 0.05 to 0.25, the retrieval precision of XCO 2 over land only changes from ∼ 0.5 ppm (∼ 0.13 %) to ∼ 1.0 ppm (∼ 0.26 %).…”

Section: Influence Of Aerosols and Cloudssupporting

confidence: 90%

“…For example, Kuang et al (2002) conducted an introductory study on the potential of using a 3-band spectrometric approach to accurately measure atmospheric CO 2 from space. The OCO-2 mission has adopted the measurement strategy pioneered by their simulation study.…”

Section: XI Et Al: Simulated Retrievals From Geostationary Orbitmentioning

confidence: 99%

“…This method for retrieval has been widely used for GOSAT (Yoshida et al, 2011), Tropospheric Emission Spectrometer, and OCO-2 (Kuang et al, 2002;Connor et al, 2008;O'Dell et al, 2012;Crisp et al, 2012). The state vector x, model parameters b, and error e are related to the measurement vector y by a forward model F:…”

Section: Retrieval Algorithmmentioning

confidence: 99%

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Simulated retrievals for the remote sensing of CO2, CH4, CO, and H2O from geostationary orbit

Natraj

Shia

et al. 2015

Atmos. Meas. Tech.

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Abstract. The Geostationary Fourier Transform Spectrometer (GeoFTS) is designed to measure high-resolution spectra of reflected sunlight in three near-infrared bands centered around 0.76, 1.6, and 2.3 µm and to deliver simultaneous retrievals of column-averaged dry air mole fractions of CO 2 , CH 4 , CO, and H 2 O (denoted XCO 2 , XCH 4 , XCO, and XH 2 O, respectively) at different times of day over North America. In this study, we perform radiative transfer simulations over both clear-sky and all-sky scenes expected to be observed by GeoFTS and estimate the prospective performance of retrievals based on results from Bayesian error analysis and characterization.We find that, for simulated clear-sky retrievals, the average retrieval biases and single-measurement precisions are < 0.2 % for XCO 2 , XCH 4 , and XH 2 O, and < 2 % for XCO, when the a priori values have a bias of 3 % and an uncertainty of 3 %. In addition, an increase in the amount of aerosols and ice clouds leads to a notable increase in the retrieval biases and slight worsening of the retrieval precisions. Furthermore, retrieval precision is a strong function of signal-to-noise ratio and spectral resolution. This simulation study can help guide decisions on the design of the GeoFTS observing system, which can result in cost-effective measurement strategies while achieving satisfactory levels of retrieval precisions and biases. The simultaneous retrievals at different times of day will be important for more accurate estimation of carbon sources and sinks on fine spatiotemporal scales and for studies related to the atmospheric component of the water cycle.

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Section: Influence Of Aerosols and Cloudssupporting

confidence: 90%

Section: XI Et Al: Simulated Retrievals From Geostationary Orbitmentioning

confidence: 99%

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Simulated retrievals for the remote sensing of CO2, CH4, CO, and H2O from geostationary orbit

Natraj

Shia

et al. 2015

Atmos. Meas. Tech.

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“…to detect small geographic and temporal changes. The usefulness of the 0 2 A-band in improving spaceborne C02 measurements, however, is predicated on accurate simulation of its absorption spectrum [9].…”

Section: Introductionmentioning

confidence: 99%

Ground-based photon path measurements from solar absorption spectra of the O2 A-band

Yang

Wennberg

Cageao

et al. 2005

Journal of Quantitative Spectroscopy and Radiative Transfer

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High-resolution solar absorption spectra obtained from Table Mountain Facility (TMF, 34.3S0N, 1 17.68OW, 2286 m elevation) have been analyzed in the region of the 0 2 A-band. The photon paths of direct sunlight in clear sky cases are retrieved from the 0 2 absorption lines and compared with ray-tracing calculations based on the solar zenith angle and surface pressure. At a given zenith angle, the ratios of retrieved to geometrically derived photon paths are highly precise (-0.2%), but they vary as the zenith angle changes. This is because current models of the spectral lineshape in this band do not properly account for the significant absorption that exists far from the centers of saturated lines. For example, use of a Voigt function with Lorentzian far wings results in an error in the retrieved photon path of as much as 5%, highly correlated with solar zenith angle. Adopting a super-Lorentz function reduces, but does not completely eliminate this problem. New lab measurements of the lineshape are required to make further progress.

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“…As illustrated by Kuang et al (Kuang et al, 2002) and D. Crisp et al (Crisp et al, 2004), three bands in the visual and nearinfrared solar-reflected spectra are required to accurately measure atmospheric CO 2 and to efficiently eliminate the impacts of aerosols and clouds (Cressie et al, 2016). Table 1 shows a summary of the ACGS spectral requirements, including the spectral ranges and resolutions.…”

Section: Spectral Performance Requirementsmentioning

confidence: 99%

Laboratory Spectral Calibration of the TanSat Atmospheric Carbon Dioxide Grating Spectrometer

Yang¹,

Zhen²,

Yin³

et al. 2018

Preprint

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Abstract. TanSat is a key satellite mission in the Chinese Earth Observation program and is designed to measure the global atmospheric column-averaged dry-air CO 2 mole fraction by measuring the visible and near-infrared solar-reflected spectra.The first Chinese super-high-resolution grating spectrometer for measuring atmospheric CO 2 is aboard TanSat. This spectrometer is a suite incorporating three grating spectrometers that make coincident measurements of reflected sunlight in the near-infrared CO 2 band near 1.61 and 2.06 micrometers and in the molecular oxygen (O 2 ) A band at 0.76 micrometers. Their 5 spectral resolving power (λ/∆λ) are ∼19000, ∼12800 and ∼12250 in O 2 A-band, WCO 2 and SCO 2 band respectively. This paper describes the prelaunch spectral calibration of the Atmospheric Carbon dioxide Grating Spectrometer aboard TanSat.Several critical aspects of the spectrometer, including the spectral resolution, spectral dispersion and the instrument line shape function of each channel, that are directly related to producing the Level 1 products were evaluated in this paper. The instrument line shape function of the spectrometer is notably symmetric and perfectly consistent across all channels in three bands. 10The variations resulting in spectral calibrations and radiometric response errors are negligible. The spectral resolution characterizations meet the mission requirements. The spectral dispersions have excellent consistency in the spatial dimension of each band, and there is good linearity in the spectral dimension of each band. Taken together, these results suggest that the spectral characterizations of the spectrometer aboard TanSat meet the mission requirements.

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Spaceborne measurements of atmospheric CO₂ by high‐resolution NIR spectrometry of reflected sunlight: An introductory study

Cited by 129 publications

References 10 publications

Simulated retrievals for the remote sensing of CO<sub>2</sub>, CH<sub>4</sub>, CO, and H<sub>2</sub>O from geostationary orbit

Simulated retrievals for the remote sensing of CO<sub>2</sub>, CH<sub>4</sub>, CO, and H<sub>2</sub>O from geostationary orbit

Ground-based photon path measurements from solar absorption spectra of the O2 A-band

Laboratory Spectral Calibration of the TanSat Atmospheric Carbon Dioxide Grating Spectrometer

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Spaceborne measurements of atmospheric CO2 by high‐resolution NIR spectrometry of reflected sunlight: An introductory study

Cited by 129 publications

References 10 publications

Simulated retrievals for the remote sensing of CO&lt;sub&gt;2&lt;/sub&gt;, CH&lt;sub&gt;4&lt;/sub&gt;, CO, and H&lt;sub&gt;2&lt;/sub&gt;O from geostationary orbit

Simulated retrievals for the remote sensing of CO&lt;sub&gt;2&lt;/sub&gt;, CH&lt;sub&gt;4&lt;/sub&gt;, CO, and H&lt;sub&gt;2&lt;/sub&gt;O from geostationary orbit

Ground-based photon path measurements from solar absorption spectra of the O2 A-band

Laboratory Spectral Calibration of the TanSat Atmospheric Carbon Dioxide Grating Spectrometer

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Product

Resources

About

Spaceborne measurements of atmospheric CO₂ by high‐resolution NIR spectrometry of reflected sunlight: An introductory study

Simulated retrievals for the remote sensing of CO<sub>2</sub>, CH<sub>4</sub>, CO, and H<sub>2</sub>O from geostationary orbit

Simulated retrievals for the remote sensing of CO<sub>2</sub>, CH<sub>4</sub>, CO, and H<sub>2</sub>O from geostationary orbit