Terrestrial Hydrometeorology

by Shuttleworth, W. James

• ISBN13: 9780470659380
• ISBN10: 0470659386
• Format: Hardcover
• Copyright: 2012-01-30
• Publisher: Wiley-Blackwell

Summary

Both hydrologists and meteorologists need to speak a common scientific language, and this has given rise to the new scientific discipline of hydrometeorology, which deals with the transfer of water and energy across the land/atmosphere interface. Terrestrial Hydrometeorology is the first graduate-level text with sufficient breadth and depth to be used in hydrology departments to teach relevant aspects of meteorology, and in meteorological departments to teach relevant aspects of hydrology, and to serve as an introductory text to teach the emerging discipline of hydrometeorology. The book will be essential reading for graduate students studying surface water hydrology, meteorology, and hydrometeorology. It can also be used in advanced undergraduate courses, and will be welcomed by academic and professional hydrologists and meteorologists worldwide.

Author Biography

Dr. Shuttleworth worked for 20 years at the UK’s Institute of Hydrology, ultimately as Head of the Hydrological Processes Division. In 1993 he joined the University of Arizona where he is Regents' Professor in both the Department of Hydrology and Water Resources and the Atmospheric Sciences Department. He has served on numerous national and international scientific advisory committees, including the National Research Council, the International Council of Scientific Unions, the International Hydrology Programme, the International Geosphere-Biosphere Programme, and the World Climate Research Programme.  In 2001 Dr. Shuttleworth was awarded the AGU Hydrology Prize for "outstanding contributions to the science of hydrology", and in 2006 IAHS, UNESCO and WMO jointly awarded him the prestigious International Hydrology Prize.

Table of Contents

Foreword	p. xvi
Preface	p. xviii
Acknowledgements	p. xix
Terrestrial Hydrometeorology and the Global Water Cycle	p. 1
Introduction	p. 1
Water in the Earth system	p. 2
Components of the global hydroclimate system	p. 4
Atmosphere	p. 5
Hydrosphere	p. 8
Cryosphere	p. 9
Lithosphere	p. 9
Biosphere	p. 10
Anthroposphere	p. 10
Important points in this Chapter	p. 12
Water Vapor in the Atmosphere	p. 14
Introduction	p. 14
Latent heat	p. 14
Atmospheric water vapor content	p. 15
Ideal Gas Law	p. 16
Virtual temperature	p. 17
Saturated vapor pressure	p. 18
Measures of saturation	p. 20
Measuring the vapor pressure of air	p. 21
Important points in this Chapter	p. 23
Vertical Gradients in the Atmosphere	p. 25
Introduction	p. 25
Hydrostatic pressure law	p. 26
Adiabatic lapse rates	p. 27
Dry adiabatic lapse rate	p. 27
Moist adiabatic lapse rate	p. 28
Environmental lapse rate	p. 28
Vertical pressure and temperature gradients	p. 29
Potential temperature	p. 30
Virtual potential temperature	p. 31
Atmospheric stability	p. 32
Static stability parameter	p. 32
Important points in this Chapter	p. 34
Surface Energy Fluxes	p. 36
Introduction	p. 36
Latent and sensible heat fluxes	p. 37
Energy balance of an ideal surface	p. 38
Net radiation, Rn	p. 38
Latent heat flux, lE	p. 39
Sensible heat flux, H	p. 39
Soil heat flux, G	p. 39
Physical energy storage, St	p. 40
Biochemical energy storage, P	p. 40
Advected energy, Ad	p. 41
Flux sign convention	p. 41
Evaporative fraction and Bowen ratio	p. 45
Energy budget of open water	p. 46
Important points in this Chapter	p. 46
Terrestrial Radiation	p. 48
Introduction	p. 48
Blackbody radiation laws	p. 49
Radiation exchange for 'gray’ surfaces	p. 51
Integrated radiation parameters for natural surfaces	p. 52
Maximum solar radiation at the top of atmosphere	p. 54
Maximum solar radiation at the ground	p. 56
Atmospheric attenuation of solar radiation	p. 58
Actual solar radiation at the ground	p. 59
Longwave radiation	p. 59
Net radiation at the surface	p. 62
Height dependence of net radiation	p. 63
Important points in this Chapter	p. 64
Soil Temperature and Heat Flux	p. 66
Introduction	p. 66
Soil surface temperature	p. 66
Subsurface soil temperatures	p. 67
Thermal properties of soil	p. 68
Density of soil, rs	p. 69
Specific heat of soil, cs	p. 70
Heat capacity per unit volume, Cs	p. 70
Thermal conductivity, ks	p. 70
Thermal diffusivity, as	p. 71
Formal description of soil heat flow	p. 71
Thermal waves in homogeneous soil	p. 72
Important points in this Chapter	p. 75
Measuring Surface Heat Fluxes	p. 77
Introduction	p. 77
Measuring solar radiation	p. 77
Daily estimates of cloud cover	p. 77
Thermoelectric pyranometers	p. 78
Photoelectric pyranometers	p. 79
Measuring net radiation	p. 80
Measuring soil heat flux	p. 81
Measuring latent and sensible heat	p. 82
Micrometeorological measurement of surface energy fluxes	p. 83
Bowen ratio/energy budget method	p. 83
Eddy correlation method	p. 85
Evaporation measurement from integrated water loss	p. 87
Evaporation pans	p. 88
Watersheds and lakes	p. 89
Lysimeters	p. 90
Soil moisture depletion	p. 91
Comparison of evaporation measuring methods	p. 91
Important points in this Chapter	p. 94
General Circulation Models	p. 96
Introduction	p. 96
What are General Circulation Models?	p. 96
How are General Circulation Models used?	p. 98
How do General Circulation Models work?	p. 100
Sequence of operations	p. 100
Solving the dynamics	p. 102
Calculating the physics	p. 103
Intergovernmental Panel on Climate Change (IPCC)	p. 104
Important points in this Chapter	p. 105
Global Scale Influences on Hydrometeorology	p. 107
Introduction	p. 107
Global scale influences on atmospheric circulation	p. 107
Planetary interrelationship	p. 109
Latitudinal differences in solar energy input	p. 109
Seasonal perturbations	p. 109
Daily perturbations	p. 109
Persistent perturbations	p. 109
Contrast in ocean to continent surface exchanges	p. 109
Continental topography	p. 109
Temporary perturbations	p. 110
Perturbations in oceanic circulation	p. 110
Perturbations in atmospheric content	p. 110
Perturbations in continental land cover	p. 110
Latitudinal imbalance in radiant energy	p. 110
Lower atmosphere circulation	p. 111
Latitudinal bands of pressure and wind	p. 111
Hadley circulation	p. 112
Mean low-level circulation	p. 113
Mean upper level circulation	p. 115
Ocean circulation	p. 116
Oceanic influences on continental hydroclimate	p. 118
Monsoon flow	p. 118
Tropical cyclones	p. 119
El Niño Southern Oscillation	p. 120
Pacific Decadal Oscillation	p. 122
North Atlantic Oscillation	p. 123
Water vapor in the atmosphere	p. 123
Important points in this Chapter	p. 126
Formation of Clouds	p. 128
Introduction	p. 128
Cloud generating mechanisms	p. 129
Cloud condensation nuclei	p. 131
Saturated vapor pressure of curved surfaces	p. 132
Cloud droplet size, concentration and terminal velocity	p. 133
Ice in clouds	p. 134
Cloud formation processes	p. 135
Thermal convection	p. 135
Foehn effect	p. 136
Extratropical fronts and cyclones	p. 138
Cloud genera	p. 140
Important points in this Chapter	p. 141
Formation of Precipitation	p. 143
Introduction	p. 143
Precipitation formation in warm clouds	p. 144
Precipitation formation in other clouds	p. 146
Which clouds produce rain?	p. 148
Precipitation form	p. 149
Raindrop size distribution	p. 150
Rainfall rates and kinetic energy	p. 151
Forms of frozen precipitation	p. 151
Other forms of precipitation	p. 152
Important points in this Chapter	p. 153
Precipitation Measurement and Observation	p. 155
Introduction	p. 155
Precipitation measurement using gauges	p. 156
Instrumental errors	p. 157
Site and location errors	p. 157
Gauge designs	p. 160
Areal representativeness of gauge measurements	p. 162
Snowfall measurement	p. 165
Precipitation measurement using ground-based radar	p. 168
Precipitation measurement using satellite systems	p. 171
Cloud mapping and characterization	p. 171
Passive measurement of cloud properties	p. 172
Spaceborne radar	p. 173
Important points in this Chapter	p. 174
Precipitation Analysis in Time	p. 176
Introduction	p. 176
Precipitation climatology	p. 177
Annual variations	p. 177
Intra-annual variations	p. 177
Daily variations	p. 180
Trends in precipitation	p. 181
Running means	p. 182
Cumulative deviations	p. 183
Mass curve	p. 184
Oscillations in precipitation	p. 186
System signatures	p. 187
Intensity-duration relationships	p. 189
Statistics of extremes	p. 190
Conditional probabilities	p. 195
Important points in this Chapter	p. 196
Precipitation Analysis in Space	p. 198
Introduction	p. 198
Mapping precipitation	p. 199
Areal mean precipitation	p. 200
Isohyetal method	p. 200
Triangle method	p. 202
Theissen method	p. 202
Spatial organization of precipitation	p. 203
Design storms and areal reduction factors	p. 205
Probable maximum precipitation	p. 207
Spatial correlation of precipitation	p. 209
Important points in this Chapter	p. 211
Mathematical and Conceptual Tools of Turbulence	p. 213
Introduction	p. 213
Signature and spectrum of atmospheric turbulence	p. 213
Mean and fluctuating components	p. 216
Rules of averaging for decomposed variables	p. 217
Variance and standard deviation	p. 219
Measures of the strength of turbulence	p. 220
Mean and turbulent kinetic energy	p. 220
Linear correlation coefficient	p. 221
Kinematic flux	p. 223
Advective and turbulent fluxes	p. 225
Important points in this Chapter	p. 229
Equations of Atmospheric Flow in the ABL	p. 231
Introduction	p. 231
Time rate of change in a fluid	p. 232
Conservation of momentum in the atmosphere	p. 234
Pressure forces	p. 235
Viscous flow in fluids	p. 236
Axis-specific forces	p. 239
Combined momentum forces	p. 242
Conservation of mass of air	p. 243
Conservation of atmospheric moisture	p. 244
Conservation of energy	p. 245
Conservation of a scalar quantity	p. 246
Summary of equations of atmospheric flow	p. 247
Important points in this Chapter	p. 247
Equations of Turbulent Flow in the ABL	p. 248
Introduction	p. 248
Fluctuations in the ideal gas law	p. 248
The Boussinesq approximation	p. 249
Neglecting subsidence	p. 250
Geostrophic wind	p. 251
Divergence equation for turbulent fluctuations	p. 252
Conservation of momentum in the turbulent ABL	p. 252
Conservation of moisture, heat, and scalars in the turbulent ABL	p. 254
Neglecting molecular diffusion	p. 255
Important points in this Chapter	p. 258
Observed ABL Profiles: Higher Order Moments	p. 259
Introduction	p. 259
Nature and evolution of the ABL	p. 259
Daytime ABL profiles	p. 261
Nighttime ABL profiles	p. 263
Higher order moments	p. 265
Prognostic equations for turbulent departures	p. 265
Prognostic equations for turbulent kinetic energy	p. 269
Prognostic equations for variance of moisture and heat	p. 271
Important points in this Chapter	p. 276
Turbulent Closure, K Theory, and Mixing Length	p. 277
Introduction	p. 277
Richardson number	p. 277
Turbulent closure	p. 279
Low order closure schemes	p. 280
Local, first order closure	p. 281
Mixing length theory	p. 283
Important points in this Chapter	p. 288
Surface Layer Scaling and Aerodynamic Resistance	p. 289
Introduction	p. 289
Dimensionless gradients	p. 290
Obukhov length	p. 292
Flux-gradient relationships	p. 293
Returning fluxes to natural units	p. 294
Resistance analogues and aerodynamic resistance	p. 296
Important points in this Chapter	p. 299
Canopy Processes and Canopy Resistances	p. 300
Introduction	p. 300
Boundary layer exchange processes	p. 301
Shelter factors	p. 306
Stomatal resistance	p. 308
Energy budget of a dry leaf	p. 310
Energy budget of a dry canopy	p. 311
Important points in this Chapter	p. 314
Whole Canopy Interactions	p. 316
Introduction	p. 316
Whole-canopy aerodynamics and canopy structure	p. 317
Excess resistance	p. 319
Roughness sublayer	p. 321
Wet canopies	p. 323
Equilibrium evaporation	p. 325
Evaporation into an unsaturated atmosphere	p. 327
Important points in this Chapter	p. 332
Daily Estimates of Evaporation	p. 334
Introduction	p. 334
Daily average values of weather variables	p. 335
Temperature, humidity, and wind speed	p. 335
Net radiation	p. 337
Open water evaporation	p. 339
Reference crop evapotranspiration	p. 341
Penman-Monteith equation estimation of ERC	p. 342
Radiation-based estimation of ERC	p. 344
Temperature-based estimation of ERC	p. 345
Evaporation pan-based estimation of ERC	p. 346
Evaporation from unstressed vegetation: the Matt-Shuttleworth approach	p. 348
Evaporation from water stressed vegetation	p. 353
Important points in this Chapter	p. 355
Soil Vegetation Atmosphere Transfer Schemes	p. 359
Introduction	p. 359
Basis and origin of land-surface sub-models	p. 359
Developing realism in SVATS	p. 362
Plot-scale, one-dimensional 'micrometeorological’ models	p. 364
Improving representation of hydrological processes	p. 367
Improving representation of carbon dioxide exchange	p. 368
Ongoing developments in land surface sub-models	p. 370
Important points in this Chapter	p. 373
Sensitivity to Land Surface Exchanges	p. 380
Introduction	p. 380
Influence of land surfaces on weather and climate	p. 381
The influence of existing land-atmosphere interactions	p. 383
Effect of topography on convection and precipitation	p. 383
Contribution by land surfaces to atmospheric water availability	p. 385
The influence of transient changes in land surfaces	p. 385
Effect of transient changes in soil moisture	p. 385
Effect of transient changes in vegetation cover	p. 388
Effect of transient changes in frozen precipitation cover	p. 389
Combined effect of transient changes	p. 391
The influence of imposed persistent changes in land cover	p. 392
Effect of imposed land cover change on near surface observations	p. 392
Effect of imposed land-cover change on regional-scale climate	p. 393
Effect of imposed heterogeneity in land cover	p. 395
Important points in this Chapter	p. 398
Example Questions and Answers	p. 404
Introduction	p. 404
Example questions	p. 404
Example Answers	p. 418
Index	p. 441
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