Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Br<sub><i>y</i></sub>

McLinden, Chris A.; Haley, C. S.; Lloyd, Nicholas; Hendrick, F.; Rozanov, A.; Sinnhuber, Björn-Martin; Goutail, Florence; Degenstein, D. A.; Llewellyn, E. J.; Sioris, C. E.; Roozendaël, Michel Van; Pommereau, Jean‐Pierre; Lotz, W.; Burrows, J. P.

doi:10.1029/2009jd012488

Cited by 41 publications

(64 citation statements)

References 73 publications

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“…Current measurement-based estimates of the VSLS contribution to stratospheric Br y range from 1.5 to 8 pptv derived from balloon-borne measurements (Dorf et al, 2008), ground-based observations of column BrO (Sinnhuber et al, 2002, and references therein), and satellite BrO measurements (Sinnhuber et al, 2005;Livesey et al, 2006;Sioris et al, 2006;McLinden et al, 2010). In addition to the estimates based on in situ and satellite observations several recent modeling studies are available which focus on bromoform (CHBr 3 ) and dibromomethan (CH 2 Br 2 ), the two most abundant short-lived bromocarbons (Law and Sturges et al, 2007).…”

Section: S Tegtmeier Et Al: Emission and Transport Of Bromocarbonsmentioning

confidence: 99%

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

et al. 2012

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Abstract. Oceanic emissions of halogenated very short-lived substances (VSLS) are expected to contribute significantly to the stratospheric halogen loading and therefore to ozone depletion. The amount of VSLS transported into the stratosphere is estimated based on in-situ observations around the tropical tropopause layer (TTL) and on modeling studies which mostly use prescribed global emission scenarios to reproduce observed atmospheric concentrations. In addition to upper-air VSLS measurements, direct observations of oceanic VSLS emissions are available along ship cruise tracks. Here we use such in-situ observations of VSLS emissions from the West Pacific and tropical Atlantic together with an atmospheric Lagrangian transport model to estimate the direct contribution of bromoform (CHBr 3 ), and dibromomethane (CH 2 Br 2 ) to the stratospheric bromine loading as well as their ozone depletion potential. Our emissionbased estimates of VSLS profiles are compared to upperair observations and thus link observed oceanic emissions and in situ TTL measurements. This comparison determines how VSLS emissions and transport in the cruise track regions contribute to global upper-air VSLS estimates. The West Pacific emission-based profiles and the global upper-air observations of CHBr 3 show a relatively good agreement indicating that emissions from the West Pacific provide an average contribution to the global CHBr 3 budget. The tropical Atlantic, although also being a CHBr 3 source region, is of less importance for global upper-air CHBr 3 estimates as revealed by the small emission-based abundances in the TTL.Western Pacific CH 2 Br 2 emission-based estimates are considerably smaller than upper-air observations as a result of the relatively low sea-to-air flux found in the West Pacific. Together, CHBr 3 and CH 2 Br 2 emissions from the West Pacific are projected to contribute to the stratospheric bromine budget with 0.4 pptv Br on average and 2.3 pptv Br for cases of maximum emissions through product and source gas injection. These relatively low estimates reveal that the tropical West Pacific, although characterized by strong convective transport, might overall contribute less VSLS to the stratospheric bromine budget than other regions as a result of only low CH 2 Br 2 and moderate CHBr 3 oceanic emissions.

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Section: S Tegtmeier Et Al: Emission and Transport Of Bromocarbonsmentioning

confidence: 99%

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

et al. 2012

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“…Absorption by trace gases is modeled using a climatology for trace gas concentrations according to McLinden et al (2010) for continuum absorbers and Sinnhuber et al (2009) for line absorbers. Settings for the temperature dependence of, for example, O 3 cross sections are the default ones employed in SCIATRAN.…”

Section: The Limiting Modelmentioning

confidence: 99%

In-flight calibration of SCIAMACHY's polarization sensitivity

et al. 2018

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Abstract. This paper describes the in-flight calibration of the polarization response of the SCIAMACHY polarization measurement devices (PMDs) and a selected region of its science channels. With the lack of polarized calibration sources it is not possible to obtain such a calibration from dedicated calibration measurements. Instead, the earthshine itself, together with a simplified radiative transfer model (RTM), is used to derive time-dependent and measurementconfiguration-dependent polarization sensitivities. The results are compared to an instrument model that describes the degradation of the instrument as a result of a slow buildup of contaminant layers on its elevation and azimuth scan mirrors. This comparison reveals significant differences between the model prediction and the data, suggesting an unforeseen change between on-ground and in-flight calibration in at least one of the polarization-sensitive components of the optical bench. The possibility of mechanisms other than scan mirror contamination contributing to the degradation of the instrument will be discussed. The data are consistent with a polarization phase shift occurring in the beam split prism used to divert the light coming from the telescope to the different channels and polarization measurement devices. The extension of the instrument degradation model with a linear retarder enables the determination of the relevant parameters to describe this phase shift and ultimately results in a significant improvement of the polarization measurements as well as the polarization response correction of measured radiances.

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“…Daily zonal mean BrO profiles, covering 16 to 36 km altitude, are measured by the Optical Spectrograph and Infra Red Imager System (OSIRIS) instrument on the Odin spacecraft (McLinden et al, 2010). Odin was launched in February 2001 into a 600 km circular, sun synchronous, near terminator orbit at an inclination of 97.8 • and an ascending node at 1800 local solar time (LST).…”

Section: R a Stachnik Et Al: Bro Submillimeterwave Measurementsmentioning

confidence: 99%

“…Following previous approaches (Kovalenko et al, 2007;McLinden et al, 2010), we estimate Br y profile from measured BrO using a photochemical model. In this study, the University of California, Irvine photochemical box model (Prather, 1992;McLinden et al, 2000;Brohede et al, 2008) was used.…”

Section: Inferred Br Ymentioning

confidence: 99%

Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer

et al. 2013

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Measurements of mixing ratio profiles of stratospheric bromine monoxide (BrO) were made using observations of BrO rotational line emission at 650.179 GHz by a balloon-borne SIS (superconductor-insulator-superconductor) submillimeterwave heterodyne limb sounder (SLS). The balloon was launched from Ft. Sumner, New Mexico (34° N) on 22 September 2011. Peak mid-day BrO abundance varied from 16 ± 2 ppt at 34 km to 6 ± 4 ppt at 16 km. Corresponding estimates of total inorganic bromine (Br_y), derived from BrO vmr (volume mixing ratio) using a photochemical box model, were 21 ± 3 ppt and 11 ± 5 ppt, respectively. Inferred Br_y abundance exceeds that attributable solely to decomposition of long-lived methyl bromide and other halons, and is consistent with a contribution from bromine-containing very short lived substances, Br_y^VSLS, of 4 ppt to 8 ppt. These results for BrO and Br_y were compared with, and found to be in good agreement with, those of other recent balloon-borne and satellite instruments

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Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Br_y

Cited by 41 publications

References 73 publications

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

In-flight calibration of SCIAMACHY's polarization sensitivity

Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer

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Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Bry

Cited by 41 publications

References 73 publications

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere

In-flight calibration of SCIAMACHY's polarization sensitivity

Stratospheric BrO abundance measured by a balloon-borne submillimeterwave radiometer

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Odin/OSIRIS observations of stratospheric BrO: Retrieval methodology, climatology, and inferred Br_y