METR 130: Lecture 6
Air Pollution Meteorology& Gaussian Model
Spring Semester, 2011
(May 10, 2011)
TURBULENCE AVERAGING
Instantaneous
Averaged
Spreading of plume as it travels downwind
Each line below is a trajectory of a different particle released from

METR 130: Assignment 1 (Spring 2011)
Due Date: February 10, 2011
Question 1: Calculate a value for the neutral ABL depth, hn, assuming the following:
u* can be related to the geostrophic wind speed, G, as u* = Cg1/2G. Here, Cg is called the
geostrophic dr

METR 130: Take-Home Assignment for Exam #2 (Spring 2011)
Due Date: March 24, 2011
Question 1: A relationship for the concentration (C) of a surface air pollution release as a
function of downwind distance from of the release (x) is as follows:
C(x) = Q/(4

METR 130: Assignment 2 (Spring 2011)
Due Date: March 10, 2011
Question 1
a. Derive an expression for the vertical profile of specific humidity q(z) in a neutral surface
layer. Be sure to account for the surface specific humidity in your expression, and al

METR 130: Take-Home Assignment for Exam #1 (Spring 2011)
Due Date: February 24, 2011
Question 1: For the following typical midday conditions
A value for incident solar radiative flux at surface of 700 W/m2.
A measured skin temperature from a downward dir

METR 130: Assignment 4 (Spring 2011)
Due Date: May 12, 2011
Question 1
A common equation for the height of the convective internal boundary layer (CIBL) as a
function of distance downwind of its edge (x = 0) is as follows:
2
hCIBL = 2.8x, where
H s ,0
c

METR 130: Assignment 3 (Spring 2011)
Due Date: April 21, 2011
Question 1
The boundary layer form of the Reynolds-averaged conservation equation for potential
temperature is
( w' ')
=
+ S+ S
t
z
where S+ and S- are source and sink terms, respectively. Der

Assignment 1 Solutions
METR 130
Spring Semester 2011
Problem 1
(Calculation of Neutral ABL depth, hn)
Given relationship hn = cu*/f
c = 0.6, u* is friction velocity and f is Coriolis parameter
u* determined from Cg = u*2/G2 = f(Ro)
Surface Rossby Number,