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  1. AU="Harald E Rieder"
  2. AU="Gandelman, M."
  3. AU="Wohnsland, Anette"
  4. AU="Reed, K R"
  5. AU="Gnanapragasam, Vincent J"
  6. AU="Vutova, M"
  7. AU="Conley, Matthew"
  8. AU="Stark, Luisa S"
  9. AU="Dettman, David L"
  10. AU="Hassan, Zurina"
  11. AU="R.N. Singh"
  12. AU="Aibo Li"

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  1. Artikel ; Online: The impact of different CO2 and ODS levels on the mean state and variability of the springtime Arctic stratosphere

    Jessica Kult-Herdin / Timofei Sukhodolov / Gabriel Chiodo / Ramiro Checa-Garcia / Harald E Rieder

    Environmental Research Letters, Vol 18, Iss 2, p

    2023  Band 024032

    Abstract: Rising greenhouse gases (GHG) and decreasing anthropogenic ozone-depleting substances (ODS) are the main drivers of the stratospheric climate evolution in the 21st century. However, the coupling between stratospheric composition, radiation and dynamics ... ...

    Abstract Rising greenhouse gases (GHG) and decreasing anthropogenic ozone-depleting substances (ODS) are the main drivers of the stratospheric climate evolution in the 21st century. However, the coupling between stratospheric composition, radiation and dynamics is subject to many uncertainties, which is partly because of the simplistic representation of ozone (O _3 ) in many current climate models. Changes in ozone due to heterogeneous chemistry are known to be the largest during springtime in the Arctic, which is also a season with very active stratosphere–troposphere coupling. The focus of this study is to investigate the role of varying ozone levels driven by changing GHG and ODS for the Arctic polar cap stratosphere. We use two state-of-the-art chemistry-climate models with ocean coupling in two configurations (prescribed ozone fields vs. interactive ozone chemistry) for three different scenarios: preindustrial conditions—1 × CO _2 , year 2000 conditions (peak anthropogenic ODS levels) and extreme future conditions—4 × CO _2 . Our results show that in the upper and middle stratosphere CO _2 thermal cooling is the dominant effect determining the temperature response under 4 × CO _2 , and outweighs warming effects of ozone by about a factor of ten. In contrast, in the lower stratosphere, the effects of O _3 warming and CO _2 cooling under 4 × CO _2 are largely offsetting each other. ODS driven variations in O _3 affect both the temperature mean and variability, and are responsible for the tight springtime coupling between composition and dynamics under year 2000 conditions in comparison to simulations under 1 × CO _2 or 4 × CO _2 .
    Schlagwörter stratosphere ; temperature ; GHG ; ODS ; interactive chemistry ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350 ; Science ; Q ; Physics ; QC1-999
    Thema/Rubrik (Code) 290
    Sprache Englisch
    Erscheinungsdatum 2023-01-01T00:00:00Z
    Verlag IOP Publishing
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel: Influence of low ozone episodes on erythemal UV-B radiation in Austria

    Schwarz, Matthias / Dietmar J. Baumgartner / Harald E. Rieder / Helga Pietsch / Mario Blumthaler / Philipp Weihs

    Theoretical and applied climatology. 2018 July, v. 133, no. 1-2

    2018  

    Abstract: This study investigates the influence of low ozone episodes on UV-B radiation in Austria during the period 1999 to 2015. To this aim observations of total column ozone (TCO) in the Greater Alpine Region (Arosa, Switzerland; Hohenpeissenberg, Germany; ... ...

    Abstract This study investigates the influence of low ozone episodes on UV-B radiation in Austria during the period 1999 to 2015. To this aim observations of total column ozone (TCO) in the Greater Alpine Region (Arosa, Switzerland; Hohenpeissenberg, Germany; Hradec Kralove, Czech Republic; Sonnblick, Austria), and erythemal UV-B radiation, available from 12 sites of the Austrian UV-B monitoring network, are analyzed. As previous definitions for low ozone episodes are not particularly suited to investigate effects on UV radiation, a novel threshold approach—considering anomalies—is developed to provide a joint framework for the analysis of extremes. TCO and UV extremes are negatively correlated, although modulating effects of sunshine duration impact the robustness of the statistical relationship. Therefore, information on relative sunshine duration (SDrel), available at (or nearby) UV-B monitoring sites, is included as explanatory variable in the analysis. The joint analysis of anomalies of both UV index (UVI) and total ozone (∆UVI, ∆TCO) and SDrel across sites shows that more than 65% of observations with strongly negative ozone anomalies (∆TCO < −1) led to positive UVI anomalies. Considering only days with strongly positive UVI anomaly (∆UVI > 1), we find (across all sites) that about 90% correspond to negative ∆TCO. The remaining 10% of days occurred during fair weather conditions (SDrel ≥ 80%) explaining the appearance of ∆UVI > 1 despite positive TCO anomalies. Further, we introduce an anomaly amplification factor (AAF), which quantifies the expected change of the ∆UVI for a given change in ∆TCO.
    Schlagwörter correlation ; monitoring ; ozone ; solar radiation ; ultraviolet radiation ; Austria ; Czech Republic ; Germany ; Switzerland
    Sprache Englisch
    Erscheinungsverlauf 2018-07
    Umfang p. 319-329.
    Erscheinungsort Springer Vienna
    Dokumenttyp Artikel
    ZDB-ID 1463177-5
    ISSN 1434-4483 ; 0177-798X
    ISSN (online) 1434-4483
    ISSN 0177-798X
    DOI 10.1007/s00704-017-2170-1
    Datenquelle NAL Katalog (AGRICOLA)

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