Toward a combined SAGE II-HALOE aerosol climatology: an evaluation of HALOE version 19 stratospheric aerosol extinction coefficient observations

Thomason, L. W.

doi:10.5194/acp-12-8177-2012

Cited by 22 publications

(21 citation statements)

References 17 publications

(28 reference statements)

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“…Pinatubo. However, Thomason (2012) reported that HALOE CH 4 does not appear to be affected by contamination from other minor or trace species within its retrieval algorithm, at least after that early volcanic period. The present study considers data points from mid-1992 and onward for the MLR analyses at all latitudes and pressure altitudes, primarily to avoid contaminating effects in the lower stratosphere and/or anomalous net transport effects at higher altitudes for some months following the eruption.…”

Section: Trends In Ch 4 From the Troposphere And In The Stratospherementioning

confidence: 99%

Methane as a diagnostic tracer of changes in the Brewer–Dobson circulation of the stratosphere

Remsberg

2015

Atmos. Chem. Phys.

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Abstract. This study makes use of time series of methane (CH 4 ) data from the Halogen Occultation Experiment (HALOE) to detect whether there were any statistically significant changes of the Brewer-Dobson circulation (BDC) within the stratosphere during 1992-2005. The HALOE CH 4 profiles are in terms of mixing ratio versus pressure altitude and are binned into latitude zones within the Southern Hemisphere and the Northern Hemisphere. Their separate time series are then analyzed using multiple linear regression (MLR) techniques. The CH 4 trend terms for the Northern Hemisphere are significant and positive at 10 • N from 50 to 7 hPa and larger than the tropospheric CH 4 trends of about 3 % decade −1 from 20 to 7 hPa. At 60 • N the trends are clearly negative from 20 to 7 hPa. Their combined trends indicate an acceleration of the BDC in the middle stratosphere of the Northern Hemisphere during those years, most likely due to changes from the effects of wave activity. No similar significant BDC acceleration is found for the Southern Hemisphere. Trends from HALOE H 2 O are analyzed for consistency. Their mutual trends with CH 4 are anti-correlated qualitatively in the middle and upper stratosphere, where CH 4 is chemically oxidized to H 2 O. Conversely, their mutual trends in the lower stratosphere are dominated by their trends upon entry to the tropical stratosphere. Time series residuals for CH 4 in the lower mesosphere also exhibit structures that are anti-correlated in some instances with those of the tracer-like species HCl. Their occasional aperiodic structures indicate the effects of transport following episodic, wintertime wave activity. It is concluded that observed multi-year, zonally averaged distributions of CH 4 can be used to diagnose major instances of wave-induced transport in the middle atmosphere and to detect changes in the stratospheric BDC.

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Section: Trends In Ch 4 From the Troposphere And In The Stratospherementioning

confidence: 99%

Methane as a diagnostic tracer of changes in the Brewer–Dobson circulation of the stratosphere

Remsberg

2015

Atmos. Chem. Phys.

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“…In general, the data sets are well correlated. Thomason (2012) showed that HALOE and SAGE II during high to moderately volcanic periods generally follow expectations for sulfate aerosol distributed in submicron aerosol size ranges. On the other hand, 5 Massie et al (1995) argued that CLAES and SAGE II are biased relative to expectations by a factor of approximately two since it is difficult to imagine a sensible aerosol size distribution and composition that would produce the observed relationship.…”

Section: Filling Gaps In the Sage II Data Set: Alternative Data Setsmentioning

confidence: 99%

“…We use HALOE (October 1991 to 2005) data at 3.40 µm following the findings of Thomason (2012) and correct for NO2 absorption following the recommendations in that paper. This is based on the idea that sulfate aerosol extinction at 3.40 and 3.46 µm should be essentially identical (<1% differences).…”

Section: The Sage II Era Data Set (October 1984 To August 2005)mentioning

confidence: 99%

“…GloSSAC is most closely related to the Assessment of Stratospheric Aerosol Properties (ASAP) (SPARC, 2006) and CMIP Phase 5 data sets and follows the same basic paradigm that produce those versions. We build it primarily using space-based measurements by a number of instruments including the SAGE series, the (Optical Spectrograph and InfraRed Imager System OSIRIS) (Rieger et al, 2015), the Cloud-Aerosol Lidar 20 and Infrared Pathfinder Satellite Observation (CALIPSO) (Vernier et al, 2011), Cryogenic Limb Array Etalon Spectrometer (CLAES) (Massie et al, 1996), and the Halogen Occultation Experiment (HALOE) (Thomason, 2012). We compile the data set in monthly depictions for 80°S to 80°N and from the tropopause to 40 km.…”

Section: Introductionmentioning

confidence: 99%

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A global, space-based stratospheric aerosol climatology: 1979 to 2016

Thomason¹,

Vernier²,

Bourassa³

et al. 2017

Preprint

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We describe the construction of a continuous 38-year record of stratospheric aerosol optical properties. The Global Space-based Stratospheric Aerosol Climatology, or GloSSAC, provided the input data to the 15 construction of the Climate Model Intercomparison Project stratospheric aerosol forcing data set (1979 to 2014) and we have extended it through 2016 following an identical process. GloSSAC focuses on the Stratospheric Aerosol and Gas Experiment (SAGE) series of instruments through mid-2005 and on the Optical Spectrograph and InfraRed Imager System (OSIRIS) and the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data thereafter. We also use data from other space 20 instruments and from ground-based, air and balloon borne instruments to fill in key gaps in the data set. The end result is a global and gap-free data set focused on aerosol extinction coefficient at 525 and 1020 nm and other parameters on an 'as available' basis. For the primary data sets, we developed a new method for filling the post-Pinatubo eruption data gap for 1991 to 1993 based on data from the Cryogenic Limb Array Etalon Spectrometer. In addition, we developed a new method for populating wintertime high 25 latitudes during the SAGE period employing a latitude-equivalent latitude conversion process that greatly improves the depiction of aerosol at high latitudes compared to earlier similar efforts. We report data in the troposphere only when and where it is available. This is primarily during the SAGE II period except the most enhanced part of the Pinatubo period. It is likely that the upper troposphere during Pinatubo was greatly enhanced over non-volcanic periods and that domain remains substantially under characterized. 30We note that aerosol levels during the OSIRIS/CALIPSO period in the lower stratosphere at mid and high latitudes is routinely higher than what we observed during the SAGE II period. While this period had nearly continuous low-level volcanic activity, it is possible that the enhancement in part reflects deficiencies in the data set. We also expended substantial effort to quality assess the data set and the product is by far the best we have produced. GloSSAC version 1.0 is available in netCDF format at the NASA Atmospheric 35 Data Center at https://eosweb.larc.nasa.gov/. GloSSAC users should cite this paper and the data set DOI

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“…In particular, satellite measurements provide global climatologies and time series of strato4400 S. Griessbach et al: Aerosol detection with infrared limb emission measurements Satellite-based limb instruments, such as the Stratospheric Aerosol and Gas Experiment (SAGE) series (Thomason et al, 1997;Bauman et al, 2003), Optical Spectrograph and InfraRed Imaging System (OSIRIS) (Rieger et al, 2015), and the Halogen Occultation Experiment (HALOE) (Thomason, 2012), have a long-standing history of measuring altituderesolved global time series of stratospheric aerosol. However, the spatial coverage of solar occultation instruments (SAGE, HALOE) is limited.…”

Section: Introductionmentioning

confidence: 99%

Infrared limb emission measurements of aerosol in the troposphere and stratosphere

et al. 2016

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Abstract. Altitude-resolved aerosol detection in the upper troposphere and lower stratosphere (UTLS) is a challenging task for remote sensing instruments. Infrared limb emission measurements provide vertically resolved global measurements at day-and nighttime in the UTLS. For high-spectralresolution infrared limb instruments we present here a new method to detect aerosol and separate between ice and nonice particles. The method is based on an improved aerosolcloud index that identifies infrared limb emission spectra affected by non-ice aerosol or ice clouds. For the discrimination between non-ice aerosol and ice clouds we employed brightness temperature difference correlations. The discrimination thresholds for this method were derived from radiative transfer simulations (including scattering) and Michel-

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Toward a combined SAGE II-HALOE aerosol climatology: an evaluation of HALOE version 19 stratospheric aerosol extinction coefficient observations

Cited by 22 publications

References 17 publications

Methane as a diagnostic tracer of changes in the Brewer–Dobson circulation of the stratosphere

Methane as a diagnostic tracer of changes in the Brewer–Dobson circulation of the stratosphere

A global, space-based stratospheric aerosol climatology: 1979 to 2016

Infrared limb emission measurements of aerosol in the troposphere and stratosphere

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