Optical property retrievals of subvisual cirrus clouds from OSIRIS limb-scatter measurements

Wiensz, J. T.; Degenstein, D. A.; Lloyd, N. D.; Bourassa, A. E.

doi:10.5194/amtd-5-5313-2012

Cited by 3 publications

(4 citation statements)

References 31 publications

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“…8 The limbscanning method allows a better detection of thin cirrus as their path of sight crosses the cirrus over a typical distance of 100 km. 9,10 Active methods using space and ground-based lidars provide data in good agreement, 11,12 however, the orbit and speed of the satellite do not allow a detailed analysis of the short-term variability.…”

Section: Cirrus Variability Observed By Satellitementioning

confidence: 84%

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Keckhut

Perrin

Thuillier

et al. 2013

J. Appl. Remote Sens

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Abstract. The temporal variability of the 532-nm optical depth of cirrus clouds observed with a lidar at Observatory of Haute-Provence (43.9°N, 5.7°E, and 683-m altitude), has been analyzed. While advection dominates at the first order, variability of the optical depth on timescales of minutes can be related to spatial fluctuations of cloud properties on typical scales of a few kilometers. Log-normal distributions of the optical depth have been used to model the variability of the cirrus optical depth as observed by lidars. These investigations have been performed for three independent classes of cirrus. The log-normal distribution of the optical depth is applicable to the classes of thin clouds; however, for thick clouds, likely due to successive freezing/defreezing effects, the distribution is rather bimodal. This work compares the effects of visible solar light scattered by inhomogeneous cirrus to effects generated by homogeneous clouds having a constant geometrical thickness using the short-scale lidar observations of optical depth distribution and an analytical approach. In the case of thin cirrus, the scattering of solar light reaching the ground is stronger for inhomogeneous than homogeneous cirrus. In case of thick cirrus, multiplescattering processes need to be considered. The conclusion is that log-normal distribution of the cirrus optical depth should be considered in any radiative calculation in case of model grids larger than a few kilometers whatever the cirrus type is. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Cirrus Variability Observed By Satellitementioning

confidence: 84%

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Keckhut

Perrin

Thuillier

et al. 2013

J. Appl. Remote Sens

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“…We have adopted the value of the quenching rate of the O 2 ( 1 ∆) recommended by the International Union of Pure and Applied Chemistry panel (IUPAC, Atkinson et al., 2005) rather than by the JPL panel (Burkholder et al., 2019). The IUPAC recommended value is slightly lower than that of JPL (−10%), which allows a better agreement with observational data (Bertaux et al., 2020; Wiensz, 2005).…”

Section: Model Descriptionmentioning

confidence: 70%

“…We have adopted the value of the quenching rate of the O 2 ( 1 ∆) recommended by the International Union of Pure and Applied Chemistry panel (IUPAC, Atkinson et al, 2005) rather than by the JPL panel (Burkholder et al, 2019). The IUPAC recommended value is slightly lower than that of JPL ( 10%), which allows a better agreement with observational data (Bertaux et al, 2020;Wiensz, 2005). The results of our simulations will be compared to measurements of temperature, ozone, and HO x radicals (defined as the sum of OH and HO 2 ) performed from the Microwave Limb Sounder (MLS).…”

Section: Implementation Of the O 2 ( 1 ∆) Photochemistrymentioning

confidence: 94%

Three‐Dimensional Modeling of the O₂(¹∆) Dayglow: Dependence on Ozone and Temperatures

Diouf,

Lefèvre,

Hauchecorne

et al. 2024

JGR Atmospheres

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Future space missions dedicated to measuring CO2 on a global scale can make advantageous use of the O2 band at 1.27 μm to retrieve the air column. The 1.27 μm band is close to the CO2 absorption bands at 1.6 and 2.0 μm, which allows a better transfer of the aerosol properties than with the usual O2 band at 0.76 μm. However, the 1.27 μm band is polluted by the spontaneous dayglow of the excited state O2 (1∆), which must be removed from the observed signal. We investigate here our quantitative understanding of the O2(1∆) dayglow with a chemistry‐transport model. We show that the previously reported −13% deficit in O2(1∆) dayglow calculated with the same model is essentially due a −20% to −30% ozone deficit between 45 and 60 km. We find that this ozone deficit is due to excessively high temperatures (+15 K) of the meteorological analyses used to drive the model in the mesosphere. The use of lower analyzed temperatures (ERA5), in better agreement with the observations, slows down the hydrogen‐catalyzed and Chapman ozone loss cycles. This effect leads to an almost total elimination of the ozone and O2(1∆) deficits in the lower mesosphere. Once integrated vertically to simulate a nadir measurement, the deficit in modeled O2(1∆) brightness is reduced to −4.2 ± 2.8%. This illustrates the need for accurate mesospheric temperatures for a priori estimations of the O2(1∆) brightness in algorithms using the 1.27 μm band.

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“…Tomographic nadir satellite remote sensing was promoted by Fleming [11] , and a rocket measurement of N + 2 391.4-nm emission in an auroral arc was retrieved by tomography [12] . More recently, mesospheric ozone profiles have been successfully retrieved by tomography and ozone optical chemistry model from the oxygen atmospheric infrared band emission [13,14] .…”

mentioning

confidence: 99%

基于紫外-可见光临边光谱反演痕量气体剖面的doas-层析成像技术

Wang¹,

Chen²,

Yang³

et al. 2011

中国光学快报

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A new method is employed for retrieving the profiles of trace gas number densities from satellite-based ultraviolet-visible (UV-Vis) spectra of scattered sunlight, which are recorded from the limb atmosphere over a range of tangent heights. The slant column abundances of trace gas along the lines of sight (LOSs) are obtained by differential optical absorption spectroscopy (DOAS), and the tomographic technique is applied to such column abundances to retrieve two-dimensional (2D) concentration profiles. For validation of the tomographic technique, the slant column abundances are simulated by a tested 2D NO2 profile set with latitudes from 90 • S to 90 • N between altitudes of 0 and 100 km, and the retrieval of number density profiles on 1-km grids is performed. The results suggest that between ±80 • , the retrieved structure is almost the same as the test data. According to the comparison of the selected cross sections of the vertical profiles between retrieved and true concentrations, the NO2 number densities have been retrieved with an accuracy of 15% or better and 5% for altitudes between 25 and 40 km. The validation of the retrieved data shows good agreement between the retrieved and true profiles.

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Optical property retrievals of subvisual cirrus clouds from OSIRIS limb-scatter measurements

Cited by 3 publications

References 31 publications

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Three‐Dimensional Modeling of the O₂(¹∆) Dayglow: Dependence on Ozone and Temperatures

基于紫外-可见光临边光谱反演痕量气体剖面的doas-层析成像技术

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Optical property retrievals of subvisual cirrus clouds from OSIRIS limb-scatter measurements

Cited by 3 publications

References 31 publications

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Subgrid-scale cirrus observed by lidar at mid-latitude: variability effects of the cloud optical depth

Three‐Dimensional Modeling of the O2(1∆) Dayglow: Dependence on Ozone and Temperatures

基于紫外-可见光临边光谱反演痕量气体剖面的doas-层析成像技术

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Three‐Dimensional Modeling of the O₂(¹∆) Dayglow: Dependence on Ozone and Temperatures