What do satellite backscatter ultraviolet and visible spectrometers see over snow and ice? A study of clouds and ozone using the A-train

Vasilkov, A. P.; Joiner, Joanna; Haffner, D. P.; Bhartia, P. K.; Spurr, Robert

doi:10.5194/amt-3-619-2010

Cited by 26 publications

(22 citation statements)

References 31 publications

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“…Hence, BrO amounts may be underestimated, if BrO is lo- cated below optically thick clouds, and BrO sensitivity can be enhanced, if BrO is located within or above a cloud (e.g., Begoin et al, 2010;Sihler et al, 2012). However, the former (shielding) effect is much less pronounced over bright surfaces (e.g., Begoin et al, 2010;Vasilkov et al, 2010), i.e. over areas where the BCTE was observed.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 98%

An exemplary case of a bromine explosion event linked to cyclone development in the Arctic

et al. 2016

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Abstract. Intense, cyclone-like shaped plumes of tropospheric bromine monoxide (BrO) are regularly observed by GOME-2 on board the MetOp-A satellite over Arctic sea ice in polar spring. These plumes are often transported by high-latitude cyclones, sometimes over several days despite the short atmospheric lifetime of BrO. However, only few studies have focused on the role of polar weather systems in the development, duration and transport of tropospheric BrO plumes during bromine explosion events. The latter are caused by an autocatalytic chemical chain reaction associated with tropospheric ozone depletion and initiated by the release of bromine from cold brine-covered ice or snow to the atmosphere.In this manuscript, a case study investigating a commashaped BrO plume which developed over the Beaufort Sea and was observed by GOME-2 for several days is presented. By making combined use of satellite data and numerical models, it is shown that the occurrence of the plume was closely linked to frontal lifting in a polar cyclone and that it most likely resided in the lowest 3 km of the troposphere. In contrast to previous case studies, we demonstrate that the dry conveyor belt, a potentially bromine-rich stratospheric air stream which can complicate interpretation of satellite retrieved tropospheric BrO, is spatially separated from the observed BrO plume. It is concluded that weather conditions associated with the polar cyclone favoured the bromine activation cycle and blowing snow production, which may have acted as a bromine source during the bromine explosion event.

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Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 98%

An exemplary case of a bromine explosion event linked to cyclone development in the Arctic

et al. 2016

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“…The ghost column correction is not applied in this special mode. Indeed, the sensitivity to ozone absorption below the cloud over bright surfaces is enhanced compared to that over dark surfaces due to multiple reflections of the radiation between the bright surface and the bottom of the cloud [ Vasilkov et al , 2010]. Figure 3 shows the distribution of the absolute differences between the monthly mean total columns considering only clear or cloudy pixels covered by snow/ice in the Arctic for July 2010.…”

Section: Gdp 44 Algorithmmentioning

confidence: 99%

The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

Loyola¹,

Koukouli²,

Valks³

et al. 2011

J. Geophys. Res.

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114

144

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The Global Ozone Monitoring Instrument (GOME‐2) was launched on EUMESAT's MetOp‐A satellite in October 2006. This paper is concerned with the retrieval algorithm GOME Data Processor (GDP) version 4.4 used by the EUMETSAT Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M‐SAF) for the operational generation of GOME‐2 total ozone products. GDP 4.4 is the latest version of the GDP 4.0 algorithm, which is employed for the generation of official Level 2 total ozone and other trace gas products from GOME and SCIAMACHY. Here we focus on enhancements introduced in GDP 4.4: improved cloud retrieval algorithms including detection of Sun glint effects, a correction for intracloud ozone, better treatment of snow and ice conditions, accurate radiative transfer modeling for large viewing angles, and elimination of scan angle dependencies inherited from Level 1 radiances. Furthermore, the first global validation results for 3 years (2007–2009) of GOME‐2/MetOp‐A total ozone measurements using Brewer and Dobson measurements as references are presented. The GOME‐2/MetOp‐A total ozone data obtained with GDP 4.4 slightly underestimates ground‐based ozone by about 0.5% to 1% over the middle latitudes of the Northern Hemisphere and slightly overestimates by around 0.5% over the middle latitudes in the Southern Hemisphere. Over high latitudes in the Northern Hemisphere, GOME‐2 total ozone has almost no offset relative to Dobson readings, while over high latitudes in the Southern Hemisphere GOME‐2 exhibits a small negative bias below 1%. For tropical latitudes, GOME‐2 measures on average lower ozone by 0% to 2% compared to Dobson measurements.

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“…Optically thick clouds shield the underlying atmosphere from satellite sensors. The OMI rotational Raman (RR) cloud product (Vasilkov et al, 2008) is used to infer information about the shielding effects of clouds over snow and ice (Vasilkov et al, 2010). This product provides an estimate of the scene (combined cloud and surface) pressure over snow and ice surfaces.…”

Section: Cloud Parametersmentioning

confidence: 99%

Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC

Choi¹,

Wang²,

Salawitch³

et al. 2011

Preprint

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We derive estimates of tropospheric BrO column amounts during two Arctic field campaigns in 2008 using information from the satellite UV nadir sensors Ozone Monitoring Instrument (OMI) and the second Global Ozone Monitoring Experiment (GOME-2) as well as estimates of stratospheric BrO columns from a model simulation. The sensitivity of the satellite-derived tropospheric BrO columns to various parameters is investigated using a radiative transfer model. We conduct a comprehensive analysis of satellite-derived tropospheric BrO columns including a detailed comparison with aircraft in-situ observations of BrO and related species obtained during the field campaigns. In contrast to prior expectation, tropospheric BrO, when present, existed over a broad range of altitudes. Our results show reasonable agreement between tropospheric BrO columns derived from the satellite observations and columns found using aircraft in-situ BrO. After accounting for the stratospheric contribution to total BrO column, several events of rapid BrO activation due to surface processes in the Arctic are apparent in both the OMI and GOME-2 based tropospheric columns. The wide orbital swath of OMI allows examination of the evolution of tropospheric BrO on about hourly time intervals near the pole. Low pressure systems, strong surface winds, and high planetary boundary layer heights are associated with the observed tropospheric BrO activation events

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What do satellite backscatter ultraviolet and visible spectrometers see over snow and ice? A study of clouds and ozone using the A-train

Cited by 26 publications

References 31 publications

An exemplary case of a bromine explosion event linked to cyclone development in the Arctic

An exemplary case of a bromine explosion event linked to cyclone development in the Arctic

The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC

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