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  • 1
    Monograph available for loan
    Monograph available for loan
    Les Ulis Cedex A, France : European Cooperation in Science and Technology ; EDP Sciences ; Tosca
    Call number: M 17.90785
    Type of Medium: Monograph available for loan
    Pages: XIII, 345 Seiten , Illustrationen, Diagramme, Karten , 24 cm
    ISBN: 9782759817337
    detail.hit.classification_display:
    D.4.
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
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    In:  [Talk] In: DRAKKAR 2018 Annual Workshop, 22.-24.01.2018, Grenoble, France .
    Publication Date: 2018-02-26
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: slideshow
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  • 3
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    In:  [Talk] In: The UTLS: Current Status and Emerging Challenges, 02.07.2018, Mainz, Germany .
    Publication Date: 2018-04-26
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 4
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    In:  [Poster] In: SPARC General Assembly 2018, 01.-05.10.2018, Kyoto, Japan .
    Publication Date: 2018-10-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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  • 5
    Publication Date: 2017-10-24
    Description: We present a set of six 20 year experiments made with a state-of-the-art chemistry-climate model that incorporates the atmosphere from the surface to the lower thermosphere. The response of the middle atmosphere to the 11 year solar cycle, its impact on the troposphere, and especially the role of an externally prescribed stratospheric quasi-biennial oscillation (QBO) is investigated with NCAR's Whole Atmosphere Community Climate Model (WACCM3). The model experiments use either fixed solar cycle inputs or fixed solar cycle together with prescribed QBO phase. The annual mean solar response in temperature and ozone in the upper stratosphere is in qualitative agreement with other modeling and observational studies and does not depend on the presence of the imposed QBO. However, the solar response in the middle to lower stratosphere differs significantly for the two QBO phases. During solar maxima a weaker Brewer-Dobson circulation with relative downwelling, warming, and enhanced ozone occurs in the tropical lower stratosphere during QBO east conditions, while a stronger circulation, cooling, and decreased ozone exists during QBO west conditions. The net ozone increase during QBO east is the combined result of production and advection, whereas during QBO west the effects cancel each other and result in little net ozone changes. Especially during Southern Hemisphere late winter to early spring, the solar response at polar latitudes switches sign between the two QBO phases and qualitatively confirms observations and other recent model studies. During a poleward downward modulation of the polar night jet and a corresponding modulation of the Brewer-Dobson circulation in time, solar signals are detected all the way down to the extratropical troposphere. Possible limitations of the model experiments with respect to the fixed solar cycle conditions or the prescribed QBO phases, as well as the constant sea surface temperatures, are discussed.
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    World Meteorological Organization
    In:  In: Scientific Assessment of Ozone Depletion: 2010, Chapter 2. World Meteorological Organization, Geneva, Switzerland, pp. 1-80.
    Publication Date: 2012-07-06
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 7
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    Nature Publishing Group
    In:  Nature Geoscience, 4 (11). pp. 735-736.
    Publication Date: 2012-08-02
    Description: The impact of solar activity on climate has been debated heatedly. Simulations with a climate model using new observations of solar variability suggest a substantial influence of the Sun on the winter climate in the Northern Hemisphere.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Springer
    In:  Space Science Reviews, 125 (1-4). pp. 273-286.
    Publication Date: 2016-06-21
    Description: Because of its chemical and radiative properties, atmospheric ozone constitutes a key element of the Earth's climate system. Absorption of sunlight by ozone in the ultraviolet wavelength range is responsible for stratospheric heating, and determines the temperature structure of the middle atmosphere. Changes in middle atmospheric ozone concentrations result in an altered radiative input to the troposphere and to the Earth's surface, with implications on the energy balance and the chemical composition of the lower atmosphere. Although a wide range of ground- and satellite-based measurements of its integrated content and of its vertical distribution have been performed since several decades, a number of uncertainties still remain as to the response of middle atmospheric ozone to changes in solar irradiance over decadal time scales. This paper presents an overview of achieved findings, including a discussion of commonly applied data analysis methods and of their implication for the obtained results. We suggest that because it does not imply least-squares fitting of prescribed periodic or proxy data functions into the considered times series, time-domain analysis provides a more reliable method than multiple regression analysis for extracting decadal-scale signals from observational ozone datasets. Applied to decadal ground-based observations, time-domain analysis indicates an average middle atmospheric ozone increase of the order of 2% from solar minimum to solar maximum, which is in reasonable agreement with model results.
    Type: Article , PeerReviewed
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  • 9
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    Società Astronomica Italiana
    In:  Memorie della Societa Astronomica Italiana, 76 . pp. 868-875.
    Publication Date: 2017-03-24
    Description: Solar variability influences the earth's atmosphere on different time scales. In particular, the impact of the 11-year solar cycle is of interest as it provides the major contribution to natural climate variability. Observations show clear 11-year variations in meteorological variables such as temperature or geopotential height from the upper atmosphere down to the troposphere and the earth's surface. In this paper the mechanisms will be discussed which are assumed to be responsible for the downward transfer of the solar signal within the atmosphere. These involve radiative, dynamical and chemical processes which have been studied in detail in model simulations and will be presented here.
    Type: Article , PeerReviewed
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  • 10
    Publication Date: 2016-11-24
    Description: A model simulation of the climate during Maunder Minimum (MM) (1645–1715) was performed using the Freie Universität Berlin Climate Middle Atmosphere Model (FUB-CMAM). A multi-year equilibrium integration with prescribed solar insolation, atmospheric composition and sea surface temperatures (SSTs) for MM conditions was compared with a present-day (PD) simulation. We find that during MM the stratosphere was significantly warmer (up to 3 K) than during PD, and dynamically more disturbed in winter. The warming is due to the dominant effect of the lower atmospheric CO2 concentration during MM, which leads to a reduced emission of long-wave radiation, and compensates the cooling due to the reduced solar irradiance. The troposphere was about 1–1.5 K cooler in the annual mean during MM. The global mean surface air temperature decreased by 0.86 K. Northern hemisphere winters were on average characterized by cooler and drier weather over the northern parts of the continents, with an increase in precipitation in the southern parts. These climate anomalies are shown to be related to a shift in the North Atlantic Oscillation (NAO) towards a predominantly low phase during MM. The simulated climate anomalies are in very good agreement with reconstructions from proxy-data. Changes in the dynamical coupling between the troposphere and stratosphere were found in the MM simulation, indicating the importance of the stratosphere for climate change.
    Type: Article , PeerReviewed
    Format: text
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