ALBERT

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.