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  • 1
    Series available for loan
    Series available for loan
    Vergleich zwischen barokliner Instabilität und Zyklonenaktivität auf unterschiedlichen Zeitskalen (1993)
    Köln
    Associated volumes
    Details Availability
    Call number: SR 93.0427(93)
    In: Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln
    Type of Medium: Series available for loan
    Pages: 100 S.
    Series Statement: Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln H. 93
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Der atmosphärische Energiezyklus der stationären und der transienten Wellen (1989)
    Köln : Inst., Univ.
    Associated volumes
    Details Availability
    Call number: MOP Per 192(62)
    In: Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln
    Type of Medium: Monograph available for loan
    Pages: 86 S.
    Series Statement: Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universität zu Köln 62
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Dissertations
    Dissertations
    On the linkage between future Arctic sea ice retreat, the large-scale atmospheric circulation and temperature extremes over Europe (2023)
    Potsdam : Universität Potsdam
    Details Availability
    Call number: AWI A4-23-95497
    Description / Table of Contents: Extreme weather and climate events are one of the greatest dangers for present-day society. Therefore, it is important to provide reliable statements on what changes in extreme events can be expected along with future global climate change. However, the projected overall response to future climate change is generally a result of a complex interplay between individual physical mechanisms originated within the different climate subsystems. Hence, a profound understanding of these individual contributions is required in order to provide meaningful assessments of future changes in extreme events. One aspect of climate change is the recently observed phenomenon of Arctic Amplification and the related dramatic Arctic sea ice decline, which is expected to continue over the next decades. The question to what extent Arctic sea ice loss is able to affect atmospheric dynamics and extreme events over mid-latitudes has received a lot of attention over recent years and still remains a highly debated topic. In this respect, the objective of ...
    Type of Medium: Dissertations
    Pages: xi, 126 Seiten , Diagramme
    URL: https://doi.org/10.25932/publishup-60488
    URN: urn:nbn:de:kobv:517-opus4-604883
    DOI: 10.25932/publishup-60488
    Language: English
    Note: Dissertation, Universität Potsdam, 2023 , CONTENTS 1 SCIENTIFIC BACKGROUND AND RESEARCH QUESTIONS 1.1 Extreme events and attribution 1.2 Arctic climate change and mid-latitude linkages 1.3 Research questions 2 FOUNDATIONS 2.1 Atmospheric basics 2.1.1 Governing equations 2.1.2 Zonal wind and temperature profiles 2.1.3 Atmospheric waves and instabilities 2.1.4 Large-scale variability patterns and blocking 2.2 Atmospheric circulation regimes 2.2.1 Dynamical concepts 2.2.2 Regime computation 2.2.3 Regime number 2.3 Arctic climate change 2.3.1 Recent trends in Arctic sea ice and temperatures 2.3.2 Surface fluxes and energy balance in Arctic regions 2.3.3 Polar amplification mechanisms 2.3.4 Arctic-mid-latitude linkages 2.4 Weather and climate extremes 2.4.1 Recent trends 2.4.2 Dynamical driver of temperature extremes 3 DATA AND METHODS 3.1 ERA5 reanalysis 3.2 Model experiments 3.2.1 The atmospheric general circulation model ECHAM6 3.2.2 Polar Amplification Intercomparison Project data 3.3 Methods 3.3.1 Statistical significance 3.3.2 Extreme definition 4 RESULTS AND DISCUSSION 4.1 Mean circulation in ERA5 and ECHAM6 experiments 4.1.1 Climatological mean states in ERA5 and the reference simulation 4.1.2 Climatological responses in ECHAM6 sensitivity experiments 4.2 Circulation regimes and sea ice-induced frequency changes 4.2.1 Regime structures in ERA5 and ECHAM6 experiments 4.2.2 Regime frequency changes in ERA 4.2.3 Regime frequency changes in ECHAM6 experiments 4.3 Changes in Northern Hemispheric temperature extremes induced by sea ice loss 4.3.1 Extreme occurrence frequency changes 4.3.2 Temperature return level changes 4.4 Links between circulation regimes and extremes over Europe 4.4.1 Winter temperature extremes 4.4.2 Summer heat extremes 4.4.3 Winter wind extremes 4.5 Decomposition of sea ice-induced frequency changes in European winter extremes 4.5.1 Midwinter cold extremes along a SCAN storyline 4.5.2 January warm extremes along a ATl- storyline 4.5.3 February warm extremes along a NAO+ storyline 4.5.4 Comparison with futSST 4.5.5 January wind extremes along a ATL- storyline 4.6 Circulation Analogue-based approach for summer season 4.6.1 ERA5 event definitions 4.6.2 Reference flows and analogues in ERA5 4.6.3 Circulation analogues in ECHAM6 experiments 4.6.4 Decomposition of sea ice-induced changes in European heat extremes 5 CONCLUSION 5.1 Summary 5.2 Final discussion and outlook Appendix A METHODS A.1 Principal Component Analysis A.2 𝑘-Means clustering A.2.1 Algorithm A.2.2 Computation of circulation regimes A.3 Taylor diagram A.4 Regression model for describing ERA5 regime frequency changes A.4.1 General setup A.4.2 Multinomial Logistic Regression A.4.3 Linear predictor A.5 Definition and calculation of return levels A.5.1 Block maxima approach and Generalized Extreme Value distribution A.5.2 Return level estimation A.6 Framework for conditional extreme event attribution Appendix B ADDITIONAL FIGURES B.1 Circulation regimes and sea ice-induced frequency changes B.2 Changes in Northern Hemispheric temperature extremes induced by sea ice loss B.3 Links between circulation regimes and extremes over Europe B.3.1 Conditioned vs. unconditioned ERA5 and wind extreme probabilities B.3.2 Wind and synoptic-scale activity anomalies B.4 Decomposition of sea ice-induced frequency changes in European winter extremes B.5 Circulation Analogue-based approach for summer season B.6 Miscellaneous B.6.1 Recent Arctic sea ice trends B.6.2 futSST forcing field B.6.3 Fluxes over sea ice and ocean surfaces in ECHAM6 BIBLIOGRAPHY
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    The Role of Ocean Dynamics for Low-Frequency Fluctuations of the NAO in a coupled Ocean-Atmosphere GCM (1998)
    Hamburg : Max-Planck-Institut für Meteorologie
    Associated volumes
    Details Availability
    Call number: ZSP-686-285
    In: Report
    Type of Medium: Monograph available for loan
    Pages: 27 S. : Abb. ; 30 cm
    ISSN: 0937-1060
    Series Statement: Report / Max-Planck-Institut für Meteorologie 285
    Branch Library: GFZ Library
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  • 5
    Monograph available for loan
    Monograph available for loan
    The Impact of El Nino- and Volcanic Forcing on the Atmospheric Energy Cycle and the Zonal Mean Atmospheric Circulation (1994)
    Hamburg : Max-Planck-Institut für Meteorologie
    Associated volumes
    Details Availability
    Call number: ZSP-686-133
    In: Report
    Type of Medium: Monograph available for loan
    Pages: 24 S. : graph. Darst. : 29,5 cm
    ISSN: 0937-1060
    Series Statement: Report / Max-Planck-Institut für Meteorologie 133
    Branch Library: GFZ Library
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  • 6
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    Berlin Dahlem precipitation time-series 2001-2013 (2017)
    PANGAEA
    In:  Supplement to: Ritschel, Christoph; Ulbrich, Uwe; Névir, Peter; Rust, Henning (2017): Precipitation extremes on multiple timescales - Bartlett-Lewis rectangular pulse model and intensity-duration-frequency curves. Hydrology and Earth System Sciences, 21(12), 6501-6517, https://doi.org/10.5194/hess-21-6501-2017
    Details
    Publication Date: 2023-01-13
    Description: For several hydrological modelling tasks, precipitation time-series with a high (i.e. sub-daily) resolution are indispensable. This data is, however, not always available and thus model simulations are used to compensate. A canonical class of stochastic models for sub-daily precipitation are Poisson-cluster processes, with the Bartlett-Lewis rectangular pulse model (BLRPM) as a prominent representative. The BLRPM has been shown to well reproduce certain characteristics found in observations. Our focus is on intensity-duration-frequency relationship (IDF), which are of particular interest in risk assessment. Based on a high resolution precipitation time-series (5-min) from Berlin-Dahlem, BLRPM parameters are estimated and IDF curves are obtained on the one hand directly from the observations and on the other hand from BLRPM simulations. Comparing the resulting IDF curves suggests that the BLRPM is able to reproduce main features of IDF statistics across several durations but cannot capture singular events (here an event of magnitude 5 times larger than the second larges event). Here, IDF curves are estimated based on a parametric model for the duration dependence of the scale parameter in the General Extreme Value distribution; this allows to obtain a consistent set of curves over all durations. We use the BLRPM to investigate the validity of this approach based on simulated long time series.
    Keywords: Berlin, Germany; Berlin-Dahlem_BotGarden; DATE/TIME; ORDINAL NUMBER; Precipitation; Tipping bucket; Weather station/meteorological observation; WST
    Type: Dataset
    Format: text/tab-separated-values, 113952 data points
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    DATA PANGAEA
  • 7
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    Earth system model results by the MPI-ESM-LR of the MiKlip Decadal climate prediction experiment improved by ocean ensemble dispersion filtering, links to NetCDF files (2017)
    PANGAEA
    In:  Supplement to: Kadow, Christopher; Illing, Sebastian; Kröner, Igor; Ulbrich, Uwe; Cubasch, Ulrich (2017): Decadal climate predictions improved by ocean ensemble dispersion filtering. Journal of Advances in Modeling Earth Systems, https://doi.org/10.1002/2016MS000787
    Details
    Publication Date: 2023-01-13
    Description: Decadal predictions by Earth system models aim to capture the state and phase of the climate several years in advance. Atmosphere-ocean interaction plays an important role for such climate forecasts. While short-term weather forecasts represent an initial value problem and long-term climate projections represent a boundary condition problem, the decadal climate prediction falls in-between these two timescales. In recent years, more precise initialization techniques of coupled Earth system models and increased ensemble sizes have improved decadal predictions. However, climate models in general start losing the initialized signal and its predictive skill from one forecast year to the next. Here we show that the climate prediction skill of an Earth system model can be improved by a shift of the ocean state towards the ensemble mean of its individual members at seasonal intervals. We found that this procedure, called ensemble dispersion filter, results in more accurate results than the standard decadal prediction. Global mean and regional temperature, precipitation, and winter cyclone predictions show an increased skill up to 5 years ahead. Furthermore, the novel technique outperforms predictions with larger ensembles and higher resolution. Our results demonstrate how decadal climate predictions benefit from ocean ensemble dispersion filtering towards the ensemble mean.
    Keywords: File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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    DATA PANGAEA
  • 8
    Electronic Resource
    Electronic Resource
    The effect of a regional increase in ocean surface roughness on the tropospheric circulation: a GCM experiment (1993)
    Springer
    Climate dynamics 8 (1993), S. 277-285 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The sensitivity of the atmospheric circulation to an increase in ocean surface roughness in the Southern Hemisphere storm track is investigated in a paired general circulation model experiment. Such a change in sea roughness could be induced by ocean waves generated by storms. Two extended permanent-July runs are made. One with standard sea surface roughness, the other with ten times as a large surface roughness over open sea poleward of 40° S. The regional increase in ocean surface roughness significantly modifies the tropospheric circulation in the Southern Hemisphere. The strongest effect is the reduction of tropospheric winds (by 2 m/s or 10%) above the area with increased roughness. The poleward eddy momentum flux is reduced in the upper troposphere and the meridional eddy sensible heat flux is reduced in the lower troposphere. Zonal mean and eddy kinetic energy are consistently reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209667
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Ester von (Hydroxymethyl)diorganylsilanen: Synthese und thermisch induzierte Umlagerung (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 591-605 
    Details
    ISSN: 0009-2940
    Keywords: (Hydroxymethyl)diorganylsilanes, esters of ; Rearrangement, thermally induced ; Kinetics ; DSC ; Calculations, ab initio ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Esters of (Hydroxymethyl)diorganylsilanes: Synthesis and Thermally Induced RearrangementTwenty silanes of the type R1R2Si(H)CH2OR3 (A) were synthesized [R1, R2 = Me, Ph, 1-naphthyl, PhCH2,Me3SiCH2; OR3 = OC(O)Me, OC(O)Ph, OC(O)CF3, OS(O)2CF3, OP(O)Ph2, OC(O)Cl] and studied for their thermal behaviour. The silanes A undergo a thermally induced rearrangement to give the corresponding silanes R1R2Si(OR3)Me (B). For compounds with OR3 = OC(O)Cl, an additional decarboxylation takes place to yield the chlorosilanes R1R2Si(Cl)Me. Except for the derivatives with OR3 = OC(O)Cl, the energetic (reaction enthalpy) and kinetic data (reaction order, frequency factor, enthalpy and entropy of activation) of these reactions were studied by means of differential scanning calorimetry (DSC). In addition, the kinetics of all reactions were investigated by 1H-NMR spectroscopy. The transition state of the rearrangement was investigated by an ab initio study based on the model compound H3SiCH2OC(O)H [→ MeH2SiOC(O)H]. The theoretical data and the experimentally obtained energetic and kinetic data are discussed in terms of mechanistic aspects of the rearrangement reaction A → B.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250310
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  • 10
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    Aspects of the January 1995 flood in Germany (1996)
    In:  Weather 51(2): 34-39
    Details
    Publication Date: 1996
    Description: During the last ten days of January 1995 the catchment area of the River Rhine received an area-averaged 100 mm of precipitation. This corresponds to 200 per cent of the long-term average for the entire month. All of this precipitation was immediately discharged as surface runoff since the soils were already saturated. Many major tributaries of the River Rhine flooded, and there were record water levels along the lower Rhine. On 30 January the water level at Cologne rose to 10.69 m. This was exactly the value reached during the great New Year flood of 1926 and 6 cm more than the third worst flood since 1780, which occurred at Christmas 1993. The January 1995 flood caused considerable economic loss but this was, however, less than the loss resulting from the Christmas 1993 flood. This paper describes the rainfall and snowmelt in the catchment area of the Rhine between 20 and 30 January 1995.
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    BIBLIOGRAPHY FLOODS GERMANY
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