Impact of difference in absorption line parameters in spectroscopic databases on CO2 and CH4 atmospheric content retrievals

Chesnokova, T. Yu.; Chentsov, A. V.; Rokotyan, Nikita; Захаров, В. И.

doi:10.1016/j.jms.2016.07.001

Cited by 12 publications

(27 citation statements)

References 38 publications

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“…The remaining airmass dependence is due to the airmass dependence of the O 2 column used to calculate XCH 4 . We note that studies [35,36] TCCON measurements of XCH 4 have been compared to aircraft profile measurements of XCH 4 made with instruments calibrated to meet World Metrological Organization (WMO) standards as detailed in Wunch et al [42]. When comparing TCCON measurements of XCH 4 to aircraft profiles Wunch et al [42] found a bias of 0.978 ± 0.002 (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Although the performance of the different spectral line shapes is similar at low SZA (as given by the percent difference in RMS residual shown in Figure 7), the spectroscopic parameters used to calculate the absorption coefficients are different. Chesnokova et al [35] showed that the total column of CH 4 retrieved using a Voigt line shape will differ with the choice of spectral line list used to calculate the absorption coefficients. Since the intensities differ between the two spectral line lists, the total column of CH 4 retrieved will also differ regardless of spectral line shape.…”

Section: Fitting Solar Spectramentioning

confidence: 99%

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Using high-resolution laboratory and ground-based solar spectra to assess CH4 absorption coefficient calculations

Mendonca

Strong

Sung

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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A quadratic-speed-dependent Voigt line shape (qSDV) with line mixing (qSDV+LM), together with spectroscopic line parameters from Devi et al. [1,2] for the 2v 3 band of CH 4 , was used to retrieve total columns of CH 4 from atmospheric solar absorption spectra. The qSDV line shape [3] with line mixing [4] was implemented into the forward model of GFIT (the retrieval algorithm that is at the heart of the GGG software [5]) to calculate CH 4 absorption coefficients. High-resolution laboratory spectra of CH 4 were used to assess absorption coefficients calculated using a Voigt line shape and spectroscopic parameters from the atm line list [6]. The same laboratory spectra were used to test absorption coefficients calculated using the qSDV+LM line shape with spectroscopic line parameters from Devi et al.[1,2] for the 2v 3 band of CH 4 and a Voigt line shape for lines that don't belong to the 2v 3 band. The spectral line list for lines that don't belong to the 2v 3 band is an amalgamation of multiple spectral line lists. We found that for the P, Q, and R branches of the 2v 3 band, the qSDV+LM simulated the laboratory spectra better than the Voigt line shape. The qSDV+LM was also used in the spectral fitting of highresolution solar absorption spectra from four ground-based remote sensing sites and compared to spectra fitted with a Voigt line shape. The average root mean square (RMS) residual for 131,124 solar

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Section: Discussionmentioning

confidence: 99%

Section: Fitting Solar Spectramentioning

confidence: 99%

Using high-resolution laboratory and ground-based solar spectra to assess CH4 absorption coefficient calculations

Mendonca

Strong

Sung

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…It indicates that the CH 4 growth is caused by not only anthropogenic impact but more natural sources. The 13 CH 4 atmospheric content can be retrieved from ground-based and satellite measurements of atmospheric solar spectra [4][5][6] . The accuracy of the 13 CH 4 retrievals in the near infrared (NIR) region depends strongly on information on absorption lines parameters in spectroscopic databases.…”

Section: Introductionmentioning

confidence: 99%

“…The 13 CH 4 atmospheric content can be retrieved from ground-based and satellite measurements of atmospheric solar spectra [4][5][6] . The accuracy of the 13 CH 4 retrievals in the near infrared (NIR) region depends strongly on information on absorption lines parameters in spectroscopic databases. Also, a choice of spectral intervals for the retrieval influences on 13 CH 4 measurement results.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of 13CH4 atmospheric content and CH4 isotopologues ratio from ground-based measurements of solar spectra

Trifonova-Yakovleva

Chesnokova

Chentsov

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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Atmospheric monitoring of methane shows that CH 4 concentration growth since 2007 is accompanied by C 13 /C 12 isotopic delta ratio shift to more negative values due to 13 CH 4 content depletion. In the work, the atmospheric total column amount and vertical profiles of 13 CH 4 and 12 CH 4 are retrieved from the ground-based measurements of solar spectra in Kourovka observatory. The CH 4 isotopologues ratio is calculated. The error of the isotopologues content retrieval is estimated for different spectral regions. On basis of the obtained results, optimal spectral windows were found.

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“…Также была оценена ошибка восстановления. Методика определения содержания метана из измеренных солнечных спектров описана в нашей работе [9].…”

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Восстановление Содержания 13ch4 И Соотношения Изотопологов Метана В Атмосфере По Наземным Измерениям Спектров Прямого Солнечного Излучения

Трифонова-Яковлева¹,

Чеснокова²,

Рокотян³

et al. 2022

XXVIII Международный Симпозиум «Оптика Атмосферы И Океана. Физика Атмосферы»

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Мониторинг содержания метана в атмосфере показывает, что рост концентраций метана с 2007 г. сопровождается смещением изотопного соотношения 13С и 12С в сторону более отрицательных значений, то есть обеднением содержания изотополога 13CH4. В данной работе определено общее содержание в столбе атмосферы и вертикальные профили 13CH4 и 12CH4 из наземных измерений прямого солнечного излучения в обсерватории в Коуровке. Рассчитано дельта соотношение изотопологов метана. Также была оценена погрешность восстановления содержания изотопологов в различных спектральных интервалах. На основании полученных результатов были выбраны оптимальные спектральные диапазоны.

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Impact of difference in absorption line parameters in spectroscopic databases on CO2 and CH4 atmospheric content retrievals

Cited by 12 publications

References 38 publications

Using high-resolution laboratory and ground-based solar spectra to assess CH4 absorption coefficient calculations

Using high-resolution laboratory and ground-based solar spectra to assess CH4 absorption coefficient calculations

Retrieval of 13CH4 atmospheric content and CH4 isotopologues ratio from ground-based measurements of solar spectra

Восстановление Содержания 13ch4 И Соотношения Изотопологов Метана В Атмосфере По Наземным Измерениям Спектров Прямого Солнечного Излучения

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