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  • 1
    Online Resource
    Online Resource
    Assessment of the quality of TOVS retrievals obtained with the 3I algorithm for Antarctic conditions
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Atmospheres Vol. 100, No. D3 ( 1995-03-20), p. 5143-5158
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 100, No. D3 ( 1995-03-20), p. 5143-5158
    Abstract: The quality of layer‐mean temperatures and humidities retrieved with the improved initialization inversion (3I) (version 2) algorithm from measurements of the TIROS operational vertical sounder (TOVS) radiometer has been studied for two summer periods in 1987 and 1990 in the Weddell Sea region (Antarctica) by means of collocations with radiosoundings, European Centre for Medium‐Range Weather Forecasts (ECMWF) analyses and special sensor microwave/imager (SSM/I) retrievals. Appropriate corrections of the atmospheric transmission functions have been used for the two periods. A significant influence on the accuracy of the retrievals has been observed. Collocation statistics with radiosoundings for layer‐mean temperatures based on 160 cases show very satisfying results. The standard deviation is very close to the deviations expected from collocation errors alone, but an overall negative bias of the retrieved temperatures is observed. Considerably smaller biases in clear conditions suggest that the frequent cloudy situations are one reason. The atmospheric stability index derived from the retrievals corresponds well to the observations. However, surface inversions and inversions capping the boundary layer (being characteristics of the polar environment) cannot be resolved by the TOVS. Layer‐mean humidities and integrated water vapor content are calculated by the 3I algorithm with a good absolute accuracy and errors are comparable to those occurring at lower latitudes. But problems have been found in the ability to correctly retrieve varying water vapor contents in different situations which is caused by weak signals in the very dry Antarctic conditions. Comparisons of the total water vapor content to results based on SSM/I measurements show a good agreement between the two different instruments and retrieval methods. Comparisons of temperature and humidity retrievals to ECMWF analyses show a better correspondence between retrievals and analyses for 1990, related probably to model and assimilation system changes. The ECMWF analyses show deviations from radiosoundings comparable to those of the retrievals emphasizing the value of TOVS retrievals as an important source of information in this data‐sparse region.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JD02960
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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  • 2
    Online Resource
    Online Resource
    Cross-validation of Advanced Microwave Sounding Unit and lidar for long-term upper-stratospheric temperature monitoring
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. D23 ( 2008-12-11)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. D23 ( 2008-12-11)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2008JD010743
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 3094268-8
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  • 3
    Online Resource
    Online Resource
    Evaluation of TOVS‐derived stratospheric temperatures up to 10 hPa for a case of vortex displacement over western Europe
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Atmospheres Vol. 103, No. D12 ( 1998-06-27), p. 13743-13761
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 103, No. D12 ( 1998-06-27), p. 13743-13761
    Abstract: At the beginning of March 1993, cold stratospheric air was displaced toward midlatitudes. In situ measurements of stratospheric temperature and water vapor obtained at Aire‐sur‐Adour (44°N, 0°E) at that time suggest that air of polar origin was indeed sampled. Corresponding observations from the satellites of the TIROS N series have been analyzed using the Improved Initialization Inversion (31) algorithm to determine temperature profiles up to ∼10 hPa (∼30 km) and to examine the evolution of the thermal fields in the stratosphere. Collocations between 3I‐retrieved temperature profiles and radiosonde reports as well as comparisons with analyzed temperatures in the low stratosphere provided by the Stratospheric Research Group of the Free University of Berlin are presented and show the satisfactory accuracy of the retrievals in this part of the atmosphere. Three layers, according to their thermal behavior, could be distinguished as follows: below 100 hPa, from 100 to 30 hPa, and above. The investigation of this new case demonstrates the potential of TIROS N observations for climatic studies.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JD00996
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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  • 4
    Online Resource
    Online Resource
    Satellite‐derived atmospheric characteristics of spiral and comma‐shaped southern hemisphere mesocyclones
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Atmospheres Vol. 102, No. D12 ( 1997-06-27), p. 13889-13905
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 102, No. D12 ( 1997-06-27), p. 13889-13905
    Abstract: Mesoscale cyclones in cold airstreams poleward of major frontal zones are generated frequently over the Southern Ocean. Quantitative information regarding the atmospheric water and wind fields of these systems can be retrieved from satellite‐borne microwave instruments. These instruments include the Special Sensor Microwave Imager (SSM/I), the first European Remote Sensing satellite (ERS‐1) scatterometer and the TIROS‐N operational vertical sounder (TOVS). In this study, we summarize the structures found in the SSM/I‐derived integrated water vapor (IWV), cloud liquid water, wind speed, and liquid and solid precipitation fields for 33 Southern Ocean mesolows. We present the ERS‐1 scatterometer surface wind vector fields for nine of these mesolows, and we analyze the TOVS‐derived geopotential thickness fields for one case. This study confirms earlier results and also examines several features not previously investigated in Southern Ocean mesolows. We find that (1) solid precipitation is more prevalent than liquid precipitation in most mesocyclones; (2) the higher‐latitude, smaller‐scale mesolows with spiral‐shaped cloud systems have lower IWV content than comma‐shaped mesolows; and (3) the surface cyclonic circulation of the mesolows is confirmed by the ERS‐1 winds. Surface fluxes of heat and moisture were estimated from European Centre for Medium‐Range Weather Forecasting (ECMWF) gridded fields for two highlighted cases and found to be moderate during the formation of the mesolow that occurred near the Antarctic ice edge and low for a comma cloud case. In addition, TOVS‐derived thickness patterns show that the Antarctic case lacked strong baroclinic structure, whereas comma cloud cases tend to develop in baroclinic environments.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JD00279
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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  • 5
    Online Resource
    Online Resource
    Atmospheric and upper ocean environments of Southern Ocean polar mesocyclones in the transition season months and associations with teleconnections
    American Geophysical Union (AGU) ; 2009
    In:  Journal of Geophysical Research Vol. 114, No. D23 ( 2009-12-04)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 114, No. D23 ( 2009-12-04)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JD011995
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
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  • 6
    Online Resource
    Online Resource
    Potential of microwave observations for the evaluation of rainfall and convection in a regional climate model in the frame of HyMeX and MED-CORDEX
    Springer Science and Business Media LLC ; 2018
    In:  Climate Dynamics Vol. 51, No. 3 ( 2018-8), p. 837-855
    Details
    In: Climate Dynamics, Springer Science and Business Media LLC, Vol. 51, No. 3 ( 2018-8), p. 837-855
    Type of Medium: Online Resource
    ISSN: 0930-7575 , 1432-0894
    URL: Article
    DOI: 10.1007/s00382-016-3203-7
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
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  • 7
    Online Resource
    Online Resource
    North Atlantic polar lows and weather regimes: do current links persist in a warmer climate?
    Wiley ; 2017
    In:  Atmospheric Science Letters Vol. 18, No. 8 ( 2017-08), p. 349-355
    Details
    In: Atmospheric Science Letters, Wiley, Vol. 18, No. 8 ( 2017-08), p. 349-355
    Abstract: Polar low development over the North Atlantic under a warmer climate is assessed using simulations of an atmospheric–oceanic coupled general circulation model, specifically with regards to the evolution of large‐scale atmospheric variability described by weather regimes, and their links with lower‐layer static stability. While a relationship has been identified for the present climate, under a warmer climate, polar low favorable conditions are expected to occur less often, and the large‐scale circulation variability appears to have reduced influence on stability, and thus, on polar low occurrence.
    Type of Medium: Online Resource
    ISSN: 1530-261X , 1530-261X
    URL: Issue
    URL: Article
    DOI: 10.1002/asl.2017.18.issue-8
    DOI: 10.1002/asl.763
    Language: English
    Publisher: Wiley
    Publication Date: 2017
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  • 8
    Online Resource
    Online Resource
    Refroidissement de la stratosphère : Détection réussie mais quantification encore incertaine
    Meteo et Climat, Societe Francaise de la Meteorologie et du Climat ; 2013
    In:  La Météorologie Vol. 8, No. 82 ( 2013), p. 31-
    Details
    In: La Météorologie, Meteo et Climat, Societe Francaise de la Meteorologie et du Climat, Vol. 8, No. 82 ( 2013), p. 31-
    Type of Medium: Online Resource
    ISSN: 0026-1181
    URL: Article
    DOI: 10.4267/2042/51479
    Language: French
    Publisher: Meteo et Climat, Societe Francaise de la Meteorologie et du Climat
    Publication Date: 2013
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  • 9
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    Online Resource
    Temperature Climatology with Rayleigh Lidar Above Observatory of Haute-Provence: Dynamical Feedback
    EDP Sciences ; 2016
    In:  EPJ Web of Conferences Vol. 119 ( 2016), p. 13009-
    Details
    In: EPJ Web of Conferences, EDP Sciences, Vol. 119 ( 2016), p. 13009-
    Type of Medium: Online Resource
    ISSN: 2100-014X
    URL: Article
    DOI: 10.1051/epjconf/201611913009
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2016
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  • 10
    Online Resource
    Online Resource
    Characteristics of stratospheric warming events during Northern winter
    American Geophysical Union (AGU) ; 2016
    In:  Journal of Geophysical Research: Atmospheres Vol. 121, No. 10 ( 2016-05-27), p. 5368-5380
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 121, No. 10 ( 2016-05-27), p. 5368-5380
    Abstract: Characterization of stratospheric warming events during wintertime Stratospheric warming continuum Polar stratospheric variability analysis
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrd.v121.10
    DOI: 10.1002/2015JD024226
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2016
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