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  • 1
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    Time Resolved Profiling of HONO by Balloon-borne Skylight Limb Observations (2008)
    In:  EPIC3EGU General Assembly 2008, Vienna..
    Details
    Publication Date: 2019-07-17
    Description: The photochemistry of stratospheric ozone in the tropics was intensively investigated during a balloon campaign at Teresina/Brazil in June 2005. Our limb scanning UV/Vis mini-DOAS instrument was deployed on 3 balloon flights on June 14 (MIPAS-B), June 17 (LPMA/DOAS) and June 30 (LPMA/IASI). During one of this flights (MIPAS-B), we could surprisingly detect HONO in the tropical tropopause transition layer (TTL). Observed HONO profiles were almost time independent for three hours around local noon with maximum HONO concentrations of 1.0x 10^9 molec/cm3 at 11 km. The measured UV/vis skylight spectra were analyzed applying the Differential Optical Absorption Spectroscopy (DOAS) method. When combined with 3D radiative-transfer modeling and an optimal estimation inversion technique, atmospheric concentration profiles of the targeted trace-gases can be inferred for each limb scan [Weidner et al., 2005]. Meteorological data and simultaneously measured O3 and NO2 indicate that the measured HONO can be best explained by intense radical photochemistry in the outflow of a meso-scale convective system, which possibly includes lightning produced NOX and HOX and, subsequent, HONO production. However, in order to explain the large amount of detected HONO by known chemical reactions, an elevated Leighton ratio and /or intense HOX photochemistry are necessary.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    Bipolar ozone loss rates measured by ozonesonde Match campaigns during IPY (2008)
    In:  EPIC3Quadrennial Ozone Symposium Tromsø, Norway from June 29th - July 5th, 2008 p.
    Details
    Publication Date: 2019-12-03
    Description: In the frame of the International Polar Year three ozonesonde Match campaigns have been performed, one in the Antarctic and two in the Arctic. Nine stations participated in the Antarctic campaign: Belgrano, Davis, Dome Concordia, Dumont dUrville, Marambio, McMurdo, Neumayer, South Pole and Syowa. The campaign lasted from early June to end of October 2007. Numerous polar and mid-latitude stations participated in both Arctic campaigns. The first one lasted from early January to early April 2007. The second campaign started mid of December 2007 and was ongoing mid of February. We present ozone loss rates deduced from data of all three campaigns. The ozone loss rates in the Antarctic follow in general those of the first Antarctic Match campaign in 2003 reaching 60 to 80 ppb/day in the range 450 K to 500 K during September. The uncertainty is larger compared to 2003 where maximum loss rates around 60 ppb/day were measured. The Arctic winter 2006/07 was a winter with moderate ozone losses compared to losses in former winters of the last two decades. Together with the winter 2007/08 the data add to the large Match data base currently consisting 14 Arctic and 2 Antarctic winters since 1991/92.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 3
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    Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm. (2009)
    In:  EPIC3Atmospheric Chemistry and Physics, 9, pp. 413-442, ISSN: 1680-7316
    Details
    Publication Date: 2019-07-17
    Description: The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61, full resolution MIPAS data covering the period 9 July 2002 to 26 March 2004) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. In the middle stratosphere, no significant bias is observed between MIPAS and correlative measurements, and MIPAS is providing a very consistent and global picture of the distribution of CH4 and N2O in this region. In average, the MIPAS CH4 values show a small positive bias in the lower stratosphere of about 5%. A similar situation is observed for N2O with a positive bias of 4%. In the lower stratosphere/upper troposphere (UT/LS) the individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61 and the estimated errors of the correlative measurements.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    Validation of version-4.61 methane and nitrous oxide observed by MIPAS (2009)
    Copernicus Publications (EGU)
    In:  Atmospheric Chemistry and Physics, 9 (2). pp. 413-442.
    Details
    Publication Date: 2015-01-15
    Description: The ENVISAT validation programme for the atmospheric instruments MIPAS, SCIAMACHY and GOMOS is based on a number of balloon-borne, aircraft, satellite and ground-based correlative measurements. In particular the activities of validation scientists were coordinated by ESA within the ENVISAT Stratospheric Aircraft and Balloon Campaign or ESABC. As part of a series of similar papers on other species [this issue] and in parallel to the contribution of the individual validation teams, the present paper provides a synthesis of comparisons performed between MIPAS CH4 and N2O profiles produced by the current ESA operational software (Instrument Processing Facility version 4.61 or IPF v4.61, full resolution MIPAS data covering the period 9 July 2002 to 26 March 2004) and correlative measurements obtained from balloon and aircraft experiments as well as from satellite sensors or from ground-based instruments. In the middle stratosphere, no significant bias is observed between MIPAS and correlative measurements, and MIPAS is providing a very consistent and global picture of the distribution of CH4 and N2O in this region. In average, the MIPAS CH4 values show a small positive bias in the lower stratosphere of about 5%. A similar situation is observed for N2O with a positive bias of 4%. In the lower stratosphere/upper troposphere (UT/LS) the individual used MIPAS data version 4.61 still exhibits some unphysical oscillations in individual CH4 and N2O profiles caused by the processing algorithm (with almost no regularization). Taking these problems into account, the MIPAS CH4 and N2O profiles are behaving as expected from the internal error estimation of IPF v4.61 and the estimated errors of the correlative measurements.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/acp-9-413-2009
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The exceptional Arctic winter 2005/06: an example to investigate polar processes using different assimilations systems (2006)
    In:  [Invited talk] In: SPARC Data Assimilation Workshop, 2.-4.10, Noordwijk, The Netherlands .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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