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  • 1
    Call number: AWI A14-13-0083 ; ad AWI A14-13-0083
    Description / Table of Contents: This handbook provides the first comprehensive review of measurement principles, instruments and processing techniques for airborne observation of the earth's atmosphere and surface. For each field, the major prinicples of measurement are presented and illustrated with commonly-used airborne instruments, to assess the present capabilities in terms of accuracy, to raise awareness of specific issues with the interpretation of measurements from airborne operations, and to review emerging measurement techniques. The authors are internationally-recognized experts in their field, who actively contribute to the design and developement of modern airborne instrumentation and processing techniques. While primarily intended for climate, geophysical and atmospheric researchers, its relevance to the solar system makes this work useful to astronomers studying planetary atmospheres with telescopes and space probes.
    Type of Medium: Monograph available for loan
    Pages: XXXII, 655 Seiten , Illustrationen
    ISBN: 9783527409969
    Series Statement: Wiley series in atmospheric physics and remote sensing
    Language: English
    Note: Contents Preface A Tribute to Dr. Robert Knollenberg List of Contributors 1 Introduction to Airborne Measurements of the Earth Atmosphere and Surface / Ulrich Schumann, David W. Fahey, Manfred Wendisch, and Jean-Louis Brenguier 2 Measurement of Aircraft State and Thermodynamic and Dynamic Variables / Jens Bange, Marco Esposito, Donald H. Lenschow, Philip R. A. Brown,Volker Dreiling, Andreas Giez, Larry Mahrt, Szymon P. Malinowski, Alfred R. Rodi, Raymond A. Shaw, Holger Siebert, Herman Smit, Martin Zöger 2.1 Introduction 2.2 Historical 2.3 Aircraft State Variables 2.3.1 Barometric Measurement of Aircraft Height 2.3.2 Inertial Attitude, Velocity, and Position 2.3.2.1 System Concepts 2.3.2.2 Attitude Angle Definitions 2.3.2.3 Gyroscopes and Accelerometers 2.3.2.4 Inertial-Barometric Corrections 2.3.3 Satellite Navigation by Global Navigation Satellite Systems 2.3.3.1 GNSS Signals 2.3.3.2 Differential GNSS 2.3.3.3 Position Errors and Accuracy of Satellite Navigation 2.3.4 Integrated IMU/GNSS Systems for Position and Attitude Determination 2.3.5 Summary, Gaps, Emerging Technologies 2.4 Static Air Pressure 2.4.1 Position Error 2.4.1.1 Tower Flyby 2.4.1.2 Trailing Sonde 2.4.2 Summary 2.5 Static Air Temperature 2.5.1 Aeronautic Definitions of Temperatures 2.5.2 Challenges of Airborne Temperature Measurements 2.5.3 Immersion Probe 2.5.4 Reverse-Flow Sensor 2.5.5 Radiative Probe 2.5.6 Ultrasonic Probe 2.5.7 Error Sources 2.5.7.1 Sensor 2.5.7.2 Dynamic Error Sources 2.5.7.3 In-Cloud Measurements 2.5.8 Calibration of Temperature Sensors 2.5.9 Summary, Gaps, Emerging Technologies 2.6 Water Vapor Measurements 2.6.1 Importance of Atmospheric Water Vapor 2.6.2 Humidity Variables 2.6.3 Dew or Frost Point Hygrometer 2.6.4 Lyman-α Absorption Hygrometer 2.6.5 Lyman-α Fluorescence Hygrometer 2.6.6 Infrared Absorption Hygrometer 2.6.7 Tunable Laser Absorption Spectroscopy Hygrometer 2.6.8 Thin Film Capacitance Hygrometer 2.6.9 Total Water Vapor and Isotopic Abundances of 18O and 2H 2.6.10 Factors Influencing In-Flight Performance 2.6.10.1 Sticking of Water Vapor at Surfaces 2.6.10.2 Sampling Systems 2.6.11 Humidity Measurements with Dropsondes 2.6.12 Calibration and In-Flight Validation 2.6.13 Summary and Emerging Technologies 2.7 Three-Dimensional Wind Vector 2.7.1 Airborne Wind Measurement Using Gust Probes 2.7.1.1 True Airspeed (TAS) and Aircraft Attitude 2.7.1.2 Wind Vector Determination 2.7.1.3 Baseline Instrumentation 2.7.1.4 Angles of Attack and Sideslip 2.7.2 Errors and Flow Distortion 2.7.2.1 Parameterization Errors 2.7.2.2 Measurement Errors 2.7.2.3 Timing Errors 2.7.2.4 Errors due to Incorrect Sensor Configuration 2.7.3 In-Flight Calibration 2.8 Small-Scale Turbulence 2.8.1 Hot-Wire/Hot-Film Probes for High-Resolution Flow Measurements 2.8.2 Laser Doppler Anemometers 2.8.3 Ultrasonic Anemometers/Thermometers 2.8.4 Measurements of Atmospheric Temperature Fluctuations with Resistance Wires 2.8.5 Calibration of Fast-Response Sensors 2.8.6 Summary, Gaps, and Emerging Technologies 2.9 Flux Measurements 2.9.1 Basics 2.9.2 Measurement Errors 2.9.3 Flux Sampling Errors 2.9.3.1 Systematic Flux Error 2.9.3.2 Random Flux Error 2.9.4 Area-Averaged Turbulent Flux 2.9.5 Preparation for Airborne Flux Measurement 3 In SituTrace Gas Measurements / Jim McQuaid, Hans Schlager, Maria Dolores Andrés-Hernández,Stephen Ball, Agnès Borbon, Steve S. Brown, Valery Catoire, Piero Di Carlo, Thomas G. Custer, Marc von Hobe, James Hopkins, Klaus Pfeilsticker, Thomas Röckmann, Anke Roiger, Fred Stroh, Jonathan Williams, and Helmut Ziereis 3.1 Introduction 3.2 Historical and Rationale 3.3 Aircraft Inlets for Trace Gases 3.4 Examples of Recent Airborne Missions 3.5 Optical In SituTechniques 3.5.1 UV Photometry 3.5.2 Differential Optical Absorption Spectroscopy 3.5.2.1 Measurement Principle 3.5.2.2 Examples of Measurement 3.5.3 Cavity Ring-Down Spectroscopy 3.5.3.1 Measurement Principle 3.5.3.2 Aircraft Implementation 3.5.3.3 Calibration and Uncertainty 3.5.3.4 Broadband Cavity Spectroscopic Methods 3.5.4 Gas Filter Correlation Spectroscopy 3.5.5 Tunable Laser Absorption Spectroscopy 3.5.5.1 Tunable Diode Versus QCLs 3.5.5.2 Further Progress 3.5.6 Fluorescence Techniques 3.5.6.1 Resonance Fluorescence 3.5.6.2 LIF Techniques 3.5.6.3 Chemical Conversion Resonance Fluorescence Technique 3.6 Chemical Ionization Mass Spectrometry 3.6.1 Negative-Ion CIMS 3.6.1.1 Measurement Principle and Aircraft Implementation 3.6.1.2 Calibration and Uncertainties 3.6.1.3 Measurement Example 3.6.2 The Proton Transfer Reaction Mass Spectrometer 3.6.3 Summary and Future Perspectives 3.7 Chemical Conversion Techniques 3.7.1 Peroxy Radical Chemical Amplification 3.7.1.1 Measurement Principles 3.7.1.2 Airborne Measurements 3.7.1.3 Calibration and Uncertainties 3.7.2 Chemiluminescence Techniques 3.7.2.1 Measurement Principle 3.7.2.2 Measurement of Ozone Using Chemiluminescence 3.7.2.3 NOy and NO2 Conversion 3.7.2.4 Calibration and Uncertainties 3.7.2.5 Measurement Examples 3.7.2.6 Summary 3.7.3 Liquid Conversion Techniques 3.7.3.1 Measurement Principles 3.7.3.2 Aircraft Implementation 3.7.3.3 Data Processing 3.7.3.4 Limitations, Uncertainties, and Error Propagation 3.7.3.5 Calibration and Maintenance 3.7.3.6 Measurement Examples 3.7.3.7 Summary and Emerging Technologies 3.8 Whole Air Sampler and Chromatographic Techniques 3.8.1 Rationale 3.8.2 Whole Air Sampling Systems 3.8.2.1 Design of Air Samplers 3.8.2.2 The M55-Geophysica Whole Air Sampler 3.8.3 Water Vapor Sampling for Isotope Analysis 3.8.4 Measurement Examples 3.8.5 Off-Line Analysis of VOCs 3.8.5.1 Air Mass Ageing 3.8.5.2 Using VOC Observations to Probe Radical Chemistry 4 In Situ Measurements of Aerosol Particles / Andreas Petzold, Paola Formenti, Darrel Baumgardner, Ulrich Bundke, Hugh Coe, Joachim Curtius, Paul J. DeMott, Richard C. Flagan, Markus Fiebig, James G. Hudson, Jim McQuaid, Andreas Minikin, Gregory C. Roberts, and Jian Wang 4.1 Introduction 4.1.1 Historical Overview 4.1.2 Typical Mode Structure of Aerosol Particle Size Distribution 4.1.3 Quantitative Description of Aerosol Particles 4.1.4 Chapter Structure 4.2 Aerosol Particle Number Concentration 4.2.1 Condensation Particle Counters 4.2.2 Calibration of Cut-Off and Low-Pressure Detection Efficiency 4.3 Aerosol Particle Size Distribution 4.3.1 Single-Particle Optical Spectrometers 4.3.1.1 Measurement Principles and Implementation 4.3.1.2 Measurement Issues 4.3.2 Aerodynamic Separators 4.3.3 Electrical Mobility Measurements of Particle Size Distributions 4.3.4 Inversion Methods 4.4 Chemical Composition of Aerosol Particles 4.4.1 Direct Offline Methods 4.4.2 Direct Online Methods (Aerosol Mass Spectrometer, Single Particle Mass Spectrometer, and Particle-Into-Liquid Sampler) 4.4.2.1 Bulk Aerosol Collection and Analysis 4.4.2.2 Mass Spectrometric Methods 4.4.2.3 Incandescence Methods 4.4.3 Indirect Methods 4.5 Aerosol Optical Properties 4.5.1 Scattering Due to Aerosol Particles 4.5.2 Absorption of Solar Radiation Due to Aerosol Particles 4.5.2.1 Filter-Based Methods 4.5.2.2 In Situ Methods 4.5.2.3 Airborne Application 4.5.3 Extinction Due to Aerosol Particles 4.5.4 Inversion Methods 4.6 CCN and IN 4.6.1 CCN Measurements Methods 4.6.2 IN Measurement Methods 4.6.3 Calibration 4.6.3.1 CCN Instrument Calibration 4.6.3.2 IN Instrument Calibration 4.7 Challenges and Emerging Techniques 4.7.1 Particle Number 4.7.2 Particle Size 4.7.3 Aerosol Optical Properties 4.7.4 Chemical Composition of Aerosol Particles 4.7.5 CCN Measurements 4.7.6 IN Measurements 5 In Situ Measurements of Cloud and Precipitation Particles / Jean-Louis Brenguier, William Bachalo, Patrick Y. Chuang, Biagio M. Esposito, Jacob Fugal, Timothy Garrett, Jean-Francois Gayet, Hermann Gerber, Andy Heymsfield, Alexander Kokhanovsky, Alexei Korolev, R. Paul Lawson, David C. Rogers, Raymond A. Shaw, Walter Strapp, and Manfred Wendisch 5.1 Introduction 5.1.1 Rationale 5.1.2 Characterization of Cloud Microphysical Properties 5.1.3 Chapter Outline 5.
    Location: AWI Reading room
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  • 2
    Series available for loan
    Series available for loan
    Leipzig : Inst. für Meteorologie der Univ.
    Associated volumes
    Call number: ZS-265(31)
    In: Wissenschaftliche Mitteilungen aus dem Institut für Meteorologie der Universität Leipzig
    Type of Medium: Series available for loan
    Pages: iv, 174 S.
    ISBN: 3980882217
    Series Statement: Wissenschaftliche Mitteilungen aus dem Institut für Meteorologie der Universität Leipzig Leipzig 31
    Classification:
    Meteorology and Climatology
    Location: Lower compact magazine
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  • 3
    Call number: AWI A7-20-93463
    Description / Table of Contents: Die Arktis erwärmt sich schneller als der Rest der Erde. Die Auswirkungen manifestieren sich unter Anderem in einer verstärkten Erwärmung der arktischen Grenzschicht. Diese Arbeit befasst sich mit Wechselwirkungen zwischen synoptischen Zyklonen und der arktischen Atmosphäre auf lokalen bis überregionalen Skalen. Ausgangspunkt dafür sind Messdaten und Modellsimulationen für den Zeitraum der N-ICE2015 Expedition, die von Anfang Januar bis Ende Juni 2015 im arktischen Nordatlantiksektor stattgefunden hat. Anhand von Radiosondenmessungen lassen sich Auswirkungen von synoptischen Zyklonen am deutlichsten im Winter erkennen, da sie durch die Advektion warmer und feuchter Luftmassen in die Arktis den Zustand der Atmosphäre von einem strahlungs-klaren in einen strahlungs-opaken ändern. Obwohl dieser scharfe Kontrast nur im Winter existiert, zeigt die Analyse, dass der integrierte Wasserdampf als Indikator für die Advektion von Luftmassen aus niedrigen Breiten in die Arktis auch im Frühjahr geeignet ist. Neben der Advektion von…
    Type of Medium: Dissertations
    Pages: xiv, 147 Seiten , Illustrationen, Diagramme
    Language: German
    Note: Inhaltsverzeichnis 1 Einleitung 1.1Wissenschaftliche Zielsetzung 2 Grundlagen 2.1 Grundgleichungen 2.2 Potentielle Vorticity 2.3 Planetare Wellen 2.4 Atmosphärische Instabilität 2.5 Grenzschicht 2.6 Kopplung von Tropo- und Stratosphäre 3 Daten und Methoden 3.1 N-ICE2015 3.1.1 Expeditionsbeschreibung 3.1.2 Ziele der Expedition 3.2 Daten 3.2.1 Beobachtungsdaten 3.2.2 ERA-Interim Reanalyse 3.2.3 Das HIRHAM5 Modell 3.3 Analysemethoden 3.3.1 Temperaturinversionen 3.3.2 Vertikale Stabilität 3.3.3 Grenzschichthöhe 3.3.4 Eady Growth Rate 3.3.5 2d-Skalenfilterung und -Pattern-Korrelation 3.3.6 Nudging Experiment 4 Analyse der N-ICE2015 Radiosonden 4.1 Blick auf die Troposphäre 4.2 Fallstudie zum M2-Sturm: A 4.3 Zyklonencharakteristika 4.4 Temperaturinversionen und Stabilität 4.5 Vergleich mit ERA-Interim, SHEBA und Ny-Ålesund 4.6 Résumé der Expeditionsdaten 5 Nudging Studien mit HIRHAM5 5.1 Vergleich mit ERA-Interim 5.2 Vergleich der Simulationen 5.3 Fallstudie zum M2-Sturm: B 5.3.1 Synoptische Aktivität 5.4 Statistischer Vergleich 6 Einfluss der Stratosphäre 6.1 Stratosphäre im Winter 2014/2015 6.2 Fallstudie zum M2-Sturm: C 6.3 PV als Ladung 6.4 Résumé der Beobachtungen 7 Zusammenfassung und Ausblick A Zusätztliche Abbildungen B Literaturverzeichnis
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  • 4
    Call number: MOP 47869 / Mitte
    Type of Medium: Dissertations
    Pages: 117, XXIII, 4 Blätter , Diagramme , 30 cm
    Language: German
    Note: Dissertation, Universität Leipzig, 1992
    Location: MOP - must be ordered
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  • 5
    Call number: AWI A4-20-93991
    Description / Table of Contents: Over the last decades, the Arctic regions of the earth have warmed at a rate 2–3 times faster than the global average– a phenomenon called Arctic Amplification. A complex, non-linear interplay of physical processes and unique pecularities in the Arctic climate system is responsible for this, but the relative role of individual processes remains to be debated. This thesis focuses on the climate change and related processes on Svalbard, an archipelago in the North Atlantic sector of the Arctic, which is shown to be a "hotspot" for the amplified recent warming during winter. In this highly dynamical region, both oceanic and atmospheric large-scale transports of heat and moisture interfere with spatially inhomogenous surface conditions, and the corresponding energy exchange strongly shapes the atmospheric boundary layer. In the first part, Pan-Svalbard gradients in the surface air temperature (SAT) and sea ice extent (SIE) in the fjords are quantified and characterized. This analysis is based on observational data from meteorological stations, operational sea ice charts, and hydrographic observations from the adjacent ocean, which cover the 1980–2016 period. [...]
    Type of Medium: Dissertations
    Pages: xv, 123 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2020 , CONTENTS 1 Introduction 1.1 Context: A rapidly changing Arctic 1.1.1 Documentation of recent changes in the Arctic 1.1.2 Research relevance 1.1.3 Objective: Svalbard as a hotspot for climate change 1.2 Physical Background 1.2.1 Radiation and surface energy balance 1.2.2 Peculiarities of the Arctic climate system 1.2.3 Role of atmospheric circulation 1.3 The regional setup on Svalbard 2 data and methods 2.1 Data description 2.1.1 Era-Interim atmospheric reanalysis 2.1.2 Svalbard Station Meteorology 2.1.3 Sea Ice Extent 2.1.4 Ocean data products 2.1.5 FLEXTRA Trajectories 2.2 Statistical Methods 2.2.1 Trend estimation 2.2.2 Correlation 2.2.3 Coefficient of Determination 3 state of surface climate parameters: pan-svalbard differences 3.1 Motivation 3.2 Surface air temperature 3.2.1 Annual cycle 3.2.2 Annual temperature range 3.2.3 Long-term trends 3.3 Fjord Sea Ice coverage 3.3.1 Climatology 3.3.2 Sea ice cover trends 3.3.3 Regional classification across Svalbard 3.3.4 Drivers of regional differences 3.4 Discussion and Conclusion 3.5 Current state of climate projections for the Svalbard region 4 Air mass back trajectories 4.1 Methodology 4.2 Winter 4.2.1 Source Regions of Ny-Ålesund Air 4.2.2 Circulation changes 4.2.3 Quantification of Advective Warming 4.3 Summer 4.3.1 Source Regions of Ny-Ålesund Air 4.3.2 Circulation changes 4.3.3 Quantification of advective cooling 4.3.4 Observational Case Study: May/June 2017 4.4 Discussion and Conclusion 5 Changing drivers of the arctic near surface temperature budget 5.1 Winter 5.2 Summer 5.3 Summary 6 Summary and conclusion A Details on calculations A.1 SLP composite Index A.2 Derivation of coefficient of determination A.3 Temperature effect of changing source regions over time B Supplementary figures Bibliography
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of atmospheric chemistry 32 (1999), S. 420-422 
    ISSN: 1573-0662
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2020-08-26
    Description: The concept of cloud radiative forcing (CRF) is commonly applied to quantify the impact of clouds on the surface radiative energy budget (REB). In the Arctic, specific radiative interactions between microphysical and macrophysical properties of clouds and the surface strongly modify the warming or cooling effect of clouds, complicating the estimate of CRF obtained from observations or models. Clouds tend to increase the broadband surface albedo over snow or sea ice surfaces compared to cloud-free conditions. However, this effect is not adequately considered in the derivation of CRF in the Arctic so far. Therefore, we have quantified the effects caused by surface-albedo–cloud interactions over highly reflective snow or sea ice surfaces on the CRF using radiative transfer simulations and below-cloud airborne observations above the heterogeneous springtime marginal sea ice zone (MIZ) during the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign. The impact of a modified surface albedo in the presence of clouds, as compared to cloud-free conditions, and its dependence on cloud optical thickness is found to be relevant for the estimation of the shortwave CRF. A method is proposed to consider this surface albedo effect on CRF estimates by continuously retrieving the cloud-free surface albedo from observations under cloudy conditions, using an available snow and ice albedo parameterization. Using ACLOUD data reveals that the estimated average shortwave cooling by clouds almost doubles over snow- and ice-covered surfaces (−62 W m−2 instead of −32 W m−2), if surface-albedo–cloud interactions are considered. As a result, the observed total (shortwave plus longwave) CRF shifted from a warming effect to an almost neutral one. Concerning the seasonal cycle of the surface albedo, it is demonstrated that this effect enhances shortwave cooling in periods when snow dominates the surface and potentially weakens the cooling by optically thin clouds during the summertime melting season. These findings suggest that the surface-albedo–cloud interaction should be considered in global climate models and in long-term studies to obtain a realistic estimate of the shortwave CRF to quantify the role of clouds in Arctic amplification.
    Print ISSN: 1680-7316
    Electronic ISSN: 1680-7324
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 8
    Publication Date: 2015-05-14
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 9
    Publication Date: 2020-07-13
    Description: A novel approach to compare airborne observations of solar spectral irradiances measured above clouds with along-track radiative transfer simulations (RTS) is presented. The irradiance measurements were obtained with the Spectral Modular Airborne Radiation Measurement System (SMART) installed on the High Altitude and Long Range Research Aircraft (HALO). The RTS were conducted using the operational ecRad radiation scheme of the Integrated Forecast System (IFS), operated by the European Centre for Medium-Range Weather Forecasts (ECMWF), and a stand-alone radiative transfer solver, the library for Radiative transfer (libRadtran). Profiles of observed and simulated radar reflectivity were provided by the HALO Microwave Package (HAMP) and the Passive and Active Microwave Transfer Model (PAMTRA), respectively. The comparison aims to investigate the capability of the two models to reproduce the observed radiation field. By analyzing spectral irradiances above clouds, different ice cloud optical parameterizations in the models were evaluated. Simulated and observed radar reflectivity fields allowed the vertical representation of the clouds modeled by the IFS to be evaluated, and enabled errors in the IFS analysis data (IFS AD) and the observations to be separated. The investigation of a North Atlantic low pressure system showed that the RTS, in combination with the IFS AD, generally reproduced the observed radiation field. For heterogeneously distributed liquid water clouds, an underestimation of upward irradiance by up to 27% was found. Simulations of ice-topped clouds, using a specific ice optics parameterization, indicated a systematic underestimation of broadband cloud-top albedo, suggesting major deficiencies in the ice optics parameterization between 1242 and 1941 nm wavelength.
    Print ISSN: 0022-4928
    Electronic ISSN: 1520-0469
    Topics: Geography , Geosciences , Physics
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  • 10
    Publication Date: 2020-08-25
    Description: Capsule summary. Helicopter-borne observations with unprecedented high resolution provide new insights in the fine-scale structure of marine boundary layer clouds and aerosol stratification over the Eastern North Atlantic.
    Print ISSN: 0003-0007
    Electronic ISSN: 1520-0477
    Topics: Geography , Physics
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