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9780470795194

Fluid Dynamics of the Mid-Latitude Atmosphere

by ;
  • ISBN13:

    9780470795194

  • ISBN10:

    0470795190

  • Edition: 1st
  • Format: Paperback
  • Copyright: 2014-11-10
  • Publisher: Wiley-Blackwell

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Summary

Authored by the leading academics in the field, this book provides a comprehensive approach to atmospheric dynamics. Using tried and tested teaching methods and based on a successful course taught at the acclaimed Department of Meteorology at Reading University, the text combines the high-level data available from research papers with the accessibility of experienced teaching practice. A set of problems is provided at the end of each chapter alongside a separate bibliography for ease of reference.

Author Biography

Having gained mathematics degrees from Cambridge and spent some post-doc years in the USA, Brian Hoskins has been at the University of Reading for more than 40 years, being made a professor in 1981, and also more recently has led a climate institute at Imperial College London.  His international activities have included being President of IAMAS and Vice-Chair of the JSC for WCRP. He is a member of the science academies of the UK, Europe, USA and China, he has received the top awards of both the Royal and American Meteorological Societies, the Vilhelm Bjerknes medal of the EGU and the Buys Ballot Medal, and he was knighted in 2007.

From a background in physics and astronomy, Ian James worked in the geophysical fluid dynamics laboratory of the Meteorological Office before joining the University of Reading in 1979. During his 31 years in the Reading meteorology department, he has taught courses in dynamical meteorology and global atmospheric circulation. In 1998, he was awarded the Buchan Prize of the Royal Meteorological Society for his work on low frequency atmospheric variability. He has been President of the Dynamical Meteorology Commission of IAMAS, vice president of the Royal Meteorological Society, and currently edits the journal Atmospheric Science Letters. He now serves as an Anglican priest in Cumbria.

Table of Contents

Series foreword ix

Preface xi

Select bibliography xv

The authors xix

1 Observed flow in the Earth’s midlatitudes 1

1.1 Vertical structure 1

1.2 Horizontal structure 4

1.3 Transient activity 11

1.4 Scales of motion 14

1.5 The Norwegian frontal model of cyclones 15

Theme 1 Fluid dynamics of the midlatitude atmosphere 25

2 Fluid dynamics in an inertial frame of reference 27

2.1 Definition of fluid 27

2.2 Flow variables and the continuum hypothesis 29

2.3 Kinematics: characterizing fluid flow 30

2.4 Governing physical principles 35

2.5 Lagrangian and Eulerian perspectives 36

2.6 Mass conservation equation 38

2.7 First Law of Thermodynamics 40

2.8 Newton’s Second Law of Motion 41

2.9 Bernoulli’s Theorem 45

2.10 Heating and water vapour 47

3 Rotating frames of reference 53

3.1 Vectors in a rotating frame of reference 53

3.2 Velocity and Acceleration 55

3.3 The momentum equation in a rotating frame 56

3.4 The centrifugal pseudo-force 57

3.5 The Coriolis pseudo-force 59

3.6 The Taylor–Proudman theorem 61

4 The spherical Earth 65

4.1 Spherical polar coordinates 65

4.2 Scalar equations 67

4.3 The momentum equations 68

4.4 Energy and angular momentum 70

4.5 The shallow atmosphere approximation 73

4.6 The beta effect and the spherical Earth 74

5 Scale analysis and its applications 77

5.1 Principles of scaling methods 77

5.2 The use of a reference atmosphere 79

5.3 The horizontal momentum equations 81

5.4 Natural coordinates, geostrophic and gradient wind balance 83

5.5 Vertical motion 87

5.6 The vertical momentum equation 89

5.7 The mass continuity equation 91

5.8 The thermodynamic energy equation 92

5.9 Scalings for Rossby numbers that are not small 95

6 Alternative vertical coordinates 97

6.1 A general vertical coordinate 97

6.2 Isobaric coordinates 100

6.3 Other pressure-based vertical coordinates 103

6.4 Isentropic coordinates 106

7 Variations of density and the basic equations 109

7.1 Boussinesq approximation 109

7.2 Anelastic approximation 111

7.3 Stratification and gravity waves 113

7.4 Balance, gravity waves and Richardson number 115

7.5 Summary of the basic equation sets 121

7.6 The energy of atmospheric motions 122

Theme 2 Rotation in the atmosphere 125

8 Rotation in the atmosphere 127

8.1 The concept of vorticity 127

8.2 The vorticity equation 129

8.3 The vorticity equation for approximate sets of equations 131

8.4 The solenoidal term 132

8.5 The expansion/contraction term 134

8.6 The stretching and tilting terms 135

8.7 Friction and vorticity 138

8.8 The vorticity equation in alternative vertical coordinates 144

8.9 Circulation 145

9 Vorticity and the barotropic vorticity equation 149

9.1 The barotropic vorticity equation 149

9.2 Poisson’s equation and vortex interactions 151

9.3 Flow over a shallow hill 155

9.4 Ekman pumping 159

9.5 Rossby waves and the beta plane 160

9.6 Rossby group velocity 166

9.7 Rossby ray tracing 170

9.8 Inflexion point instability 172

10 Potential vorticity 177

10.1 Potential vorticity 177

10.2 Alternative derivations of Ertel’s theorem 180

10.3 The principle of invertibility 182

10.4 Shallow water equation potential vorticity 186

11 Turbulence and atmospheric flow 189

11.1 The Reynolds number 189

11.2 Three-dimensional flow at large Reynolds number 194

11.3 Two-dimensional flow at large Reynolds number 196

11.4 Vertical mixing in a stratified fluid 201

11.5 Reynolds stresses 203

Theme 3 Balance in atmospheric flow 209

12 Quasi-geostrophic flows 211

12.1 Wind and temperature in balanced flows 211

12.2 The quasi-geostrophic approximation 215

12.3 Quasi-geostrophic potential vorticity 219

12.4 Ertel and quasi-geostrophic potential vorticities 221

13 The omega equation 225

13.1 Vorticity and thermal advection form 225

13.2 Sutcliffe Form 231

13.3 Q-vector form 233

13.4 Ageostrophic flow and the maintenance of balance 238

13.5 Balance and initialization 240

14 Linear theories of baroclinic instability 245

14.1 Qualitative discussion 245

14.2 Stability analysis of a zonal flow 247

14.3 Rossby wave interpretation of the stability conditions 256

14.4 The Eady model 264

14.5 The Charney and other quasi-geostrophic models 271

14.6 More realistic basic states 275

14.7 Initial value problem 281

15 Frontogenesis 291

15.1 Frontal scales 291

15.2 Ageostrophic circulation 294

15.3 Description of frontal collapse 299

15.4 The semi-geostrophic Eady model 305

15.5 The confluence model 307

15.6 Upper-level frontogenesis 309

16 The nonlinear development of baroclinic waves 311

16.1 The nonlinear domain 311

16.2 Semi-geostrophic baroclinic waves 312

16.3 Nonlinear baroclinic waves on realistic jets on the sphere 320

16.4 Eddy transports and zonal mean flow changes 323

16.5 Energetics of baroclinic waves 332

17 The potential vorticity perspective 337

17.1 Setting the scene 337

17.2 Potential vorticity and vertical velocity 340

17.3 Life cycles of some baroclinic waves 342

17.4 Alternative perspectives 346

17.5 Midlatitude blocking 350

17.6 Frictional and heating effects 352

18 Rossby wave propagation and potential vorticity mixing 361

18.1 Rossby wave propagation 361

18.2 Propagation of Rossby waves into the stratosphere 363

18.3 Propagation through a slowly varying medium 365

18.4 The Eliassen–Palm flux and group velocity 370

18.5 Baroclinic life cycles and Rossby waves 372

18.6 Variations of amplitude 373

18.7 Rossby waves and potential vorticity steps 375

18.8 Potential vorticity steps and the Rhines scale 381

Appendices 389

Appendix A: Notation 389

Appendix B: Revision of vectors and vector calculus 393

B.1 Vectors and their algebra 393

B.2 Products of vectors 394

B.3 Scalar fields and the grad operator 396

B.4 The divergence and curl operators 397

B.5 Gauss’ and Stokes’ theorems 398

B.6 Some useful vector identities 401

Index 403

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