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CHAPTER 4. ATMOSPHERIC TRANSPORT - Harvard …

40 CHAPTER 4. ATMOSPHERIC TRANSPORTWe saw in CHAPTER 3 that air motions play a key role in determiningthe distributions of chemical species in the are determined by three principal forces: gravity,pressure-gradient, and Coriolis. We previously saw in CHAPTER 2that the vertical distribution of mass in the atmosphere isdetermined by a balance between gravity and the pressure-gradientforce; when these forces are out of balancebuoyant motionsresult,which will be discussed in section In the horizontal direction,where gravity does not operate, the equilibrium of forces usuallyinvolves a balance between the pressure-gradient force and theCoriolis force, and the resulting steady flow is called 1-km altitude, the horizontal flow is modified byfriction with the atmosphere is considerably thinner in its vertical extent (scaleheight 7 km) than in its horizontal extent.

40 CHAPTER 4. ATMOSPHERIC TRANSPORT We saw in chapter 3 that air motions play a key role in determining the distributions of chemical species in the atmosphere.

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