Radar meteorology : a first course /: a first course. (2018)

• Record Type: Book
• Further Information: Note: Robert M. Rauber, Stephen W. Nesbitt.
• Authors: Rauber, Robert M; Nesbitt, Stephen William
• Contents: Preface xvii Acknowledgments xxi About the Companion Website xxiii 1 Properties of Electromagnetic Waves 1 1.1 Introduction 1 1.2 Electric and magnetic fields 2 1.2.1 The electric field 2 1.2.2 The magnetic field 4 1.2.3 Relating the electric and magnetic fields—a simple dipole antenna 5 1.2.4 Maxwell equations 6 1.3 The nature of electromagnetic radiation 8 1.3.1 The electromagnetic spectrum 8 1.3.2 Electromagnetic wave interactions 9 1.4 Interactions of electromagnetic waves with matter 11 1.4.1 Refraction 12 1.4.2 Reflection 12 1.4.3 Mie scattering 14 1.4.4 Bragg scattering 17 1.4.5 Absorption 18 1.5 Polarization of electromagnetic waves 18 Important terms 20 Review questions 21 Challenge problems 22 2 Radar Hardware 23 2.1 Introduction 23 2.2 Frequency and wavelength 23 2.3 Components of a weather radar system 25 2.3.1 Transmitter section 26 2.3.2 Waveguides, rotary joints, polarization switching devices, and circulators 28 2.3.3 The antenna section 32 2.3.4 The receiver section 36 2.3.5 Magnetron transmitters 38 2.4 Specialized radar systems 40 2.4.1 Phased-array radars 40 2.4.2 Mobile and deployable radars 41 2.4.3 Airborne radars 43 2.4.4 Spaceborne radars 44 Important terms 46 Review questions 47 Challenge problems 47 3 Radar Characteristics 49 3.1 Introduction 49 3.2 Range and range ambiguity 50 3.3 The transmitted and received signal 53 3.3.1 Pulse duration and pulse length 54 3.3.2 Power and the duty cycle 54 3.4 Radar geometry and types of displays 56 3.4.1 Common radar displays in spherical coordinates 56 Important terms 64 Review questions 64 Challenge problems 64 4 The Path of a Radar Ray 66 4.1 Introduction 66 4.2 Ray propagation in an idealized atmosphere 67 4.2.1 Factors influencing radar ray paths 67 4.2.2 The path of a ray in an idealized atmosphere 69 4.2.3 The range and height of a pulse volume in space 72 4.3 Anomalous propagation 74 Important terms 78 Review questions 78 Challenge problems 79 5 Power and the Radar Reflectivity Factor 82 5.1 Introduction 82 5.2 Radar equation for a solitary target 83 5.2.1 Power flux density incident on a target 83 5.2.2 Power flux density scattered back to the radar 85 5.2.3 Backscattered power collected by the radar antenna 86 5.2.4 Implications of the radar equation 87 5.3 Radar equation for a distributed target 89 5.3.1 The contributing volume for distributed targets 89 5.3.2 The radar cross section of distributed targets 91 5.3.3 The radar equation for a distributed target 94 5.4 The weather radar equation 95 5.4.1 Radar cross section of a small dielectric sphere 95 5.4.2 The radar reflectivity factor 96 5.4.3 The weather radar equation 97 5.4.4 The validity of the Rayleigh approximation 98 5.5 Summary 100 Important terms 101 Review questions 101 Challenge problems 102 6 Radial Velocity—The Doppler Effect 104 6.1 Introduction 104 6.2 Measurement of radial velocity 106 6.2.1 Phase measurements and radial velocity retrieval 107 6.2.2 Velocity ambiguities and their resolution 108 6.3 Doppler spectra 115 6.3.1 Doppler spectra of weather and other targets 116 6.3.2 Moments of the Doppler spectrum 117 6.4 Measurement of the Doppler moments 119 6.5 Summary 122 Important terms 123 Review questions 123 Challenge problems 124 7 Dual-Polarization Radar 126 7.1 Introduction 126 7.2 The physical bases for radar polarimetry 127 7.3 Measuring polarimetric quantities 130 7.4 Reflectivity, differential reflectivity, and linear depolarization ratio 132 7.4.1 Reflectivity factor in the dual-polarization framework (ZHH and ZVV) 132 7.4.2 Differential reflectivity (ZDR) 133 7.4.3 Raindrop shapes and sizes 134 7.4.4 ZDR measurements in rain 138 7.4.5 ZDR measurements in ice and mixed-phase precipitation 141 7.4.6 Linear depolarization ratio (LDR) 145 7.5 Polarization and phase 149 7.5.1 Propagation differential phase shift (DP) 150 7.5.2 Backscatter differential phase shift () 152 7.5.3 Specific differential phase (KDP) 152 7.5.4 Retrieval of KDP 155 7.5.5 Co-polar correlation coefficient (HV) 162 7.5.6 Using polarimetric variables together 168 7.5.7 Covariation of the polarimetric variables: an example at Sand C-band 168 7.5.8 Using dual-polarization variables to discern meteorological versus non-meteorological echo and non-uniform beam filling 170 7.5.9 Hydrometeor classification 172 Important terms 176 Review questions 181 Challenge problems 181 8 Clear Air Echoes 183 8.1 Introduction 183 8.2 Ground clutter 184 8.2.1 Ground clutter characteristics 184 8.2.2 Sea clutter 185 8.2.3 Effects of anomalous propagation 188 8.2.4 Ground clutter mitigation 188 8.3 Echoes from biological sources 191 8.3.1 Insect echo 192 8.3.2 Birds and bats 193 8.4 Debris, dust, and smoke 195 8.5 Aircraft echoes and chaff 196 8.6 Other non-meteorological echo sources 198 8.6.1 The sun 199 8.6.2 Receiver noise 199 8.6.3 Radio interference 200 8.7 Bragg scattering 200 Important terms 203 Review questions 203 Challenge problems 204 9 Propagation Effects: Attenuation and Refractivity 205 9.1 Introduction 205 9.2 Attenuation 206 9.2.1 Attenuation by atmospheric gases and measurement of water vapor 207 9.2.2 Attenuation by cloud droplets and measurement of liquid water content 212 9.2.3 Attenuation by rain and its correction 214 9.2.4 Attenuation by hail 219 9.2.5 Short-wavelength radars and attenuation 224 9.3 Refractivity 225 9.3.1 Basic principles 226 9.3.2 Measurement of the water vapor field 227 Important terms 229 Review questions 229 Challenge problems 230 10 Operational Radar Networks 232 10.1 Introduction 232 10.2 The WSR-88D radar network 233 10.2.1 Network coverage 233 10.2.2 Radar characteristics and data distribution 234 10.2.3 Scanning strategies 236 10.2.4 Ground clutter suppression 240 10.2.5 Super resolution 240 10.2.6 Additional features 242 10.3 Terminal Doppler weather radars 242 10.3.1 Radar characteristics and data distribution 243 10.4 International operational radar networks 246 Important terms 248 Review questions 249 Challenge problems 249 11 Doppler Velocity Patterns and Single-Radar Wind Retrieval 251 11.1 Introduction 251 11.2 Kinematic properties of the wind field 252 11.3 Doppler radial velocity patterns and the wind field 254 11.3.1 Large-scale flow patterns 255 11.3.2 Fronts 257 11.3.3 Convective scale flow patterns 259 11.4 Wind retrieval with profiling radars 261 11.4.1 Wind profilers 261 11.5 Velocity–azimuth display wind retrieval 264 11.5.1 VAD
• Edition: 1st
• Publisher Details: Chichester : Wiley Blackwell
• Publication Date: 2018
• Extent: 1 online resource
• Subjects: 551.6353; Radar meteorology
• Languages: English
• ISBNs: 9781118432631; 9781119085973; 9781118432655; 9781118432648; 9781119085980
• Related ISBNs: 9781118432624
• Notes: Note: Description based on CIP data; resource not viewed.
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