An improved high-resolution solar reference spectrum for earth's atmosphere measurements in the ultraviolet, visible, and near infrared

Chance, K.; Kurucz, Robert L.

doi:10.1016/j.jqsrt.2010.01.036

Cited by 410 publications

(355 citation statements)

References 16 publications

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“…The irradiance at the top of the atmosphere is taken from Chance and Kurucz (2010). In this work they report an accuracy of better than 5 %.…”

Section: A13 E T 0 (λ) and Overall Calibration Uncertaintymentioning

confidence: 84%

“…The instrument is calibrated at 342 nm using well-characterised sun photometer measurements of direct beam irradiance, and the other wavelengths calibrated using the ratio-Langley technique (Wilson and Forgan, 1995). All this is referenced to a top-ofthe-atmosphere spectrum (Chance and Kurucz, 2010) which serves as the primary calibration of both wavelength and intensity. The optical input for the system was modified in October 1999, resulting in higher optical throughput (and hence better signal/noise ratios) and a diffuser with a better cosine response.…”

Section: Methodsmentioning

confidence: 99%

“…One of the changes in this version of the model is the use of the same solar spectrum (Chance and Kurucz, 2010) as that used for the calibration of SRAD. The calculations have been run at a range of solar zenith angles using an aerosol optical depth (AOD) of 0.05 at 550 nm, a value typical of conditions at Cape Grim (Wilson and Forgan, 2002).…”

Section: Modelling J (O 1 D)mentioning

confidence: 99%

“…This equates to a knowledge of the solar direct beam irradiance as a function of wavelength E T 0 (λ), where T here indicates the top of the atmosphere. For this work the spectrum of Chance and Kurucz (2010) has been used. The initial focus is on the calibration of direct beam irradiance.…”

Section: A1 Calibration Strategymentioning

confidence: 99%

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Characterisation of J(O1D) at Cape Grim 2000–2005

Wilson

2015

Atmos. Chem. Phys.

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Abstract.Estimates of the rate of production of excited oxygen atoms due to the photolysis of ozone (J (O 1 D)) have been derived from radiation measurements carried out at Cape Grim, Tasmania (40.6 • S, 144.7 • E). The individual measurements have a total uncertainty of 16 % (1σ ). These estimates agree well with model estimates of clear-sky photolysis rates. Observations spanning 2000-2005 have been used to quantify the impact of season, clouds and ozone column amount. The annual cycle of J (O 1 D) has been investigated via monthly means. These means show an interannual variation (monthly standard deviation) of 9 %, but in midsummer and midwinter this reduces to 3-5 %. Variations in solar zenith angle and total column ozone explain 86 % of the observed variability in the measured photolysis rates. The impact of total column ozone, expressed as a radiation amplification factor (RAF), is found to be ∼ 1.53, in agreement with model estimates. This ozone dependence explains 20 % of the variation observed at medium solar zenith angles (30-50 • ). The impact of clouds results in a median reduction of 30 % in J (O 1 D) for the same solar zenith angle range. Including estimates of cloudiness derived from long-wave radiation measurements resulted in a statistically significant fit to observations, but the quality of the fit did not increase significantly as measured by the adjusted R 2 .

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“…The irradiance at the top of the atmosphere is taken from Chance and Kurucz (2010). In this work they report an accuracy of better than 5 %.…”

Section: A13 E T 0 (λ) and Overall Calibration Uncertaintymentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Modelling J (O 1 D)mentioning

confidence: 99%

Section: A1 Calibration Strategymentioning

confidence: 99%

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Characterisation of J(O1D) at Cape Grim 2000–2005

Wilson

2015

Atmos. Chem. Phys.

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“…To this end, a reference solar atlas, E s , accurate in absolute vacuum wavelength to better than 0.001 nm (Chance and Kurucz, 2010) is degraded at the resolution of the instrument, through convolution by the TROPOMI instrumental slit function.…”

Section: Wavelength Calibration and Convolution To Tropomi Resolutionmentioning

confidence: 99%

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

et al. 2017

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Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (S-5P) platform will measure ultraviolet earthshine radiances at high spectral and improved spatial resolution (pixel size of 7 km × 3.5 km at nadir) compared to its predecessors OMI and GOME-2. This paper presents the sulfur dioxide (SO 2 ) vertical column retrieval algorithm implemented in the S-5P operational processor UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) and comprehensively describes its various retrieval steps. The spectral fitting is performed using the differential optical absorption spectroscopy (DOAS) method including multiple fitting windows to cope with the large range of atmospheric SO 2 columns encountered. It is followed by a slant column background correction scheme to reduce possible biases or across-track-dependent artifacts in the data. The SO 2 vertical columns are obtained by applying air mass factors (AMFs) calculated for a set of representative a priori profiles and accounting for various parameters influencing the retrieval sensitivity to SO 2 . Finally, the algorithm includes an error analysis module which is fully described here. We also discuss verification results (as part of the algorithm development) and future validation needs of the TROPOMI SO 2 algorithm.

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Ozone photolysis: Strong isotopologue/isotopomer selectivity in the stratosphere

et al. 2014

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We calculated the photolysis rate coefficients of five ozone isotopologues/isotopomers as functions of altitude up to 80 km using recent ab initio absorption cross sections and an averaged actinic flux. Three of the five ozone isotopologues/isotopomers are symmetric, with a single isotopic dissociation channel, and two are asymmetric with two isotopic dissociation channels. The specific contributions of the Chappuis, Huggins, and Hartley bands to the photolysis rates and enrichments have been determined as a function of altitude. The Chappuis and Hartley bands have a dominant contribution to the photolysis rates, respectively at low and high altitudes, but these two bands are characterized by small fractionations. In contrast, the Huggins band has a minor contribution to the overall photolysis rate at any altitude, but it generates most of the strong fractionation which peaks around 35 km. The photolysis fractionations are "mass dependent" in contrast with those due to the ozone formation process which are "non-mass dependent." The altitude dependences of our photolysis fractionations are in qualitative agreement with those of Liang et al. (2006)

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An improved high-resolution solar reference spectrum for earth's atmosphere measurements in the ultraviolet, visible, and near infrared

Cited by 410 publications

References 16 publications

Characterisation of <i>J</i>(O<sup>1</sup>D) at Cape Grim 2000–2005

Characterisation of <i>J</i>(O<sup>1</sup>D) at Cape Grim 2000–2005

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

Ozone photolysis: Strong isotopologue/isotopomer selectivity in the stratosphere

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An improved high-resolution solar reference spectrum for earth's atmosphere measurements in the ultraviolet, visible, and near infrared

Cited by 410 publications

References 16 publications

Characterisation of &lt;i&gt;J&lt;/i&gt;(O&lt;sup&gt;1&lt;/sup&gt;D) at Cape Grim 2000–2005

Characterisation of &lt;i&gt;J&lt;/i&gt;(O&lt;sup&gt;1&lt;/sup&gt;D) at Cape Grim 2000–2005

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

Ozone photolysis: Strong isotopologue/isotopomer selectivity in the stratosphere

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Characterisation of <i>J</i>(O<sup>1</sup>D) at Cape Grim 2000–2005

Characterisation of <i>J</i>(O<sup>1</sup>D) at Cape Grim 2000–2005