Retrievals for the atmospheric chemistry experiment Fourier-transform spectrometer

Boone, C. D.; Nassar, Ray; Walker, Kaley A.; Rochon, Y.; McLeod, Sean D.; Rinsland, C. P.; Bernath, Peter F.

doi:10.1364/ao.44.007218

Cited by 425 publications

(360 citation statements)

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“…The irregular retrieval grid is defined by the tangent altitudes. The retrieval setup is reported by Boone et al (2005) for versions 2.1 and 2.2. For version 3.0 the changes in the retrieval setup are described in Boone et al (2013) and chiefly address temperature issues.…”

Section: Ace-ftsmentioning

confidence: 99%

Validation of revised methane and nitrous oxide profiles from MIPAS–ENVISAT

et al. 2016

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Section: Ace-ftsmentioning

confidence: 99%

Validation of revised methane and nitrous oxide profiles from MIPAS–ENVISAT

et al. 2016

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“…The retrieval approach is similar to the one adopted by ACE [24] and the method of Carlott [25]. It is based on nonlinear least squares fitting of spectra for the target molecule and interfering molecules.…”

Section: Analysis and Comparison With Model Predictionsmentioning

confidence: 99%

“…It is based on nonlinear least squares fitting of spectra for the target molecule and interfering molecules. Our analysis combines the COClF lines from the 1995 ATMOS supplemental linelist [18], the ACE solar spectra, and spectral parameters for other molecules from HITRAN 2004 [20] with the retrieved profiles of temperature, pressure, and tangent altitude for individual ACE occultations [24]. A refractive ray tracing program was used with the ACE-derived temperature profile and tangent heights to calculate airmass-weighted pressures, temperatures, and atmospheric ray paths for individual ACE occultations.…”

Section: Analysis and Comparison With Model Predictionsmentioning

confidence: 99%

“…Similar to other infrared experiments (e.g., [9,22,24,[26][27][28]), a set of microwindows were selected for analysis. The 8 selected windows are reported in Table 1 with the interferences fitted in addition to COClF in the retrievals.…”

Section: Analysis and Comparison With Model Predictionsmentioning

confidence: 99%

“…as a function of wavenumber [24]. Profiles containing mixing ratios with large uncertainties relative to the measured value were also discarded from the tropical measurement set.…”

Section: Analysis and Comparison With Model Predictionsmentioning

confidence: 99%

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Spectroscopic detection of COClF in the tropical and mid-latitude lower stratosphere

Rinsland

Nassar

Boone

et al. 2007

Journal of Quantitative Spectroscopy and Radiative Transfer

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We report retrievals of COClF (carbonyl chlorofluoride) based on atmospheric chemistry experiment (ACE) solar occultation spectra recorded at tropical and mid-latitudes during [2004][2005]. The COClF molecule is a temporary reservoir of both chlorine and fluorine and has not been measured previously by remote sensing. A maximum COClF mixing ratio of 99:7 AE 48:0 pptv (10 À12 per unit volume, 1 sigma) is measured at 28 km for tropical and subtropical occultations (latitudes below 20 in both hemispheres) with lower mixing ratios at both higher and lower altitudes. Northern hemisphere mid-latitude mixing ratios (30-501N) resulted in an average profile with a peak mixing ratio of 51:7 AE 32:1 pptv, 1 sigma, at 27 km, also decreasing above and below that altitude. We compare the measured average profiles with the one reported set of in situ lower stratospheric mid-latitude measurements from 1986 and 1987, a previous two-dimensional (2-D) model calculation for 1987 and 1993, and a 2-D-model prediction for 2004. The measured average tropical profile is in close agreement with the model prediction; the northern mid-latitude profile is also consistent, although the peak in the measured profile occurs at a higher altitude (2.5-4.5 km offset) than in the model prediction. Seasonal average 2-D-model predictions of the COClF stratospheric distribution for 2004 are also reported. r

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Methyl chloride from the Aura Microwave Limb Sounder: First global climatology and assessment of variability in the upper troposphere and stratosphere

et al. 2013

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[1] Methyl chloride (CH 3 Cl) is by far the largest natural carrier of chlorine to the stratosphere. Its importance in stratospheric ozone chemistry is expected to increase in the coming decades as emission controls alter the relative contributions from natural and anthropogenic halogen sources. The Microwave Limb Sounder (MLS) on NASA's Aura satellite provides the first daily global observations of CH 3 Cl. Here we quantify the quality of the MLS version 3 CH 3 Cl data (single-profile precision of˙100 pptv; accuracy of 30-45%; vertical and horizontal resolution of 4-5 km and 450-600 km, respectively) and demonstrate their utility for scientific studies over the vertical range from 147 to 4.6 hPa. We exploit the unmatched scope of the 8 year MLS data set to investigate the spatial, seasonal, and interannual variations in the distribution of CH 3 Cl in the upper troposphere/lower stratosphere (UTLS). Like carbon monoxide, CH 3 Cl is a marker of pollution from biomass burning that can be lofted to the UTLS very rapidly by deep convection. The climatological seasonal cycle in CH 3 Cl reflects variability in regional fire activity and other surface sources as well as convection, and anomalous CH 3 Cl enhancements in the tropical upper troposphere are linked to specific episodes of intense burning. Methyl chloride is shown to be very useful as a tracer of large-scale dynamical processes, such as diabatic descent inside the stratospheric winter polar vortices, quasi-isentropic cross-tropopause transport associated with the summer monsoon circulations, and effects related to the quasi-biennial oscillation and the tropical "tape recorder".

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Retrievals for the atmospheric chemistry experiment Fourier-transform spectrometer

Cited by 425 publications

References 37 publications

Validation of revised methane and nitrous oxide profiles from MIPAS–ENVISAT

Validation of revised methane and nitrous oxide profiles from MIPAS–ENVISAT

Spectroscopic detection of COClF in the tropical and mid-latitude lower stratosphere

Methyl chloride from the Aura Microwave Limb Sounder: First global climatology and assessment of variability in the upper troposphere and stratosphere

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