Physics/Ocean 4520/5520 A Introduction to Atmospheric Science
Dept. of Physics and Atmospheric Science, Ian.Folkins"at"dal.ca, room
131, Dunn Building, 902-494-1292
Two quizzes (30 percent), Assignments (20 percent), and final exam
(50 percent). The number to letter conversion is A+(90.0-100),
A(85.0-90.0), A-(80.0-85.0), B+(77.0-80.0), B(73.0-77.0),
B-(70.0-73.0), C+(65.0-70.0), C(60.0-65.0), C-(55.0-60.0),
D(50.0-55.0), F(below 50.0). For graduate students, the weighting is
quizzes (30 percent), assignments (15 percent), project (10 percent),
and final exam (45 percent). The conversion to a letter grade is
the same as for undergraduates, except anything below 70 is
an F. (see FGS calendar for implications on programme continuation).
The final exam will be 3 hours and occur during the official
Atmospheric Science. An Introductory Survey, Wallace and Hobbs. Second Edition.
We will cover Chapters 1 - 4, and 10 from the text, plus supplementary material
from the class web page and class notes.
Pandemic H1N1 Influenza Advisory in relation to Academic Continuity
In the event of an escalation of the pandemic H1N1 influenza virus, the
University may need to authorize Academic Units to change elements of class
schedules and/or evaluation plans as outlined in course syllabi. Any change
is intended to support the primary goal of reducing the risk of spreading a
pandemic influenza among students, faculty and staff.
Although it is difficult to predict the severity of the pandemic, the
University is committed to minimizing the impact on student's academic
progress. Therefore, every effort will be made to provide students with
options for continued learning and for continued fair evaluations.
Changes may include but are not limited to:
- Adjustments to course assignments;
- Changes to the dates of exams;
- Arrangements for alternative evaluations for students affected
by H1N1 influenza virus;
- Adjustments to work terms;
- Modification of marks awarded for participation;
- Adjustments to attendance policies.
Any alternative plan made in individual courses may be superseded by
University-wide or Government measures to reduce the spread of the pandemic
H1N1 influenza virus.
We will continue to seek input from you and we will keep you informed as we
proceed into the 2009/10 academic term. Should you have immediate
questions or suggestions please contact Susan Spence Wach, Chair, Academic
Continuity Planning Group,
Great Reference: Encyclopedia of the Atmospheric Sciences
This 6 volume encyclopedia is in the reference room of the library.
The call number is REF QC 854 E735 2003. You can find a clear
description of virtually anything there. Please drop by and check it
out sometime. Wikipedia is also quite good on the atmosphere, e.g.
the section on the Ice Ages.
This is just to give you a flavour of the kind of questions I ask. Some of this
material has not been covered.
Some of the formulas here have not yet been discussed in class, so you
would not be responsible for.
Quiz 1: October 20 (class 12)
Quiz 2: November 17 (class 20)
Exam Date: Tuesday December 15, 10:00 am, 221C
In general, the quantitative questions will be similar to what has been
given in the assignments, the tests, and tests from previous years.
A printout of the formula sheet and skewT-lnp plots will be provided.
You are permitted a calculator but no other materials.
Required material for Quiz 1
As of October 15, I have covered most of the text up to page 78. The emphasis will be on
the class notes, assignments, and web pages (i.e. Supplemental Material for Chapters
1, 2, and 3).
Required Material for Quiz 2
Quiz 2 will be on water vapor in the atmosphere (the various water vapor variables
and their inter-relationships, skew-T plots, flow over a mountain, the des/dT
derivation, es(T) curves, ice, stratocumulus clouds, the MALR, latent heats,
EQPT, application to cloud height, moist static energy), buoyancy frequency,
and what we have done in class up till and including Nov 12
on energy balance models, radiation, and the
greenhouse effect. Note that some of this material was covered in the last 1-2
classes before quiz 1. In terms of Supplemental Material for Chapter 4,
you are responsible for the sections up to and including the
Mysterious Factor of 4 in S0/4.
You are not responsible for Supplemental Material from other
Chapters. From the text, you are responsible for Sections 3.4.4, 3.5.1 (except
wet bulb), 3.5.2, 3.5.3, 3.5.4, 3.5.5, 3.5.6, 3.5.7, 3.6, and 3.7.3. Nothing
directly from Chapter 4, though you may want to read parts of this Chapter
for your own benefit.
Required material for the Exam
Everything required for Quiz 1 and Quiz 2, and all lecture notes since then.
From Chapter 4 of the text, you are responsible for: 4.1, 4.3, 4.5.5, and 4.6.
From Chapter 10, we did 10.1 (but not Fig 10.4 or 10.7 or 10.10). We also discussed
Fig 10.31, 10.35, 10.36, the sections of 10.3 related to radiative forcings
and feedbacks, and 10.4 on Global Sea Level Rise.
I have gone through the web pages
and made notes of the sections you are not responsible for. Everything else is
required. The Trenberth paper is also required reading.
Answers: Quiz 2
(1) w, PT, fv, q, dse conserved.
(2) Main thing was to get constant value of dT/dz at dry value up to the LCL,
sudden decrease in dT/dz at LCL, and slow convergence to dry value in upper
(3) Hard for overnight surface temperatures to go below daytime Td
since consensation as T < Td is a heat source, slows down T decrease due to
(4) Can use to calculate equivalent potential temperature, and top outflow
altitude near height at which EQPT of parcel coming up from the surface
equals PT of background atmosphere.
(5) Mostly no problems, except w constant during descent in (viii) and equal
to saturated value at 500 hPa from (v).
(6) Mostly no problems. Invoke conservation of PT in (iv) to find temperature
at the surface, to get es.
(7) (i) Solar flux at earth = (Power of Sun)/(area of sphere with radius Re).
As the distance Re of the earth from the sun increases the output power of the
sun gets distributed over a large area, and the solar flux goes down. Same
type of question as how much warmth do you get r distance away from 100 W
light bulb. (ii) Done in the notes. (iii) recalculate the solar flux as in
(i) and find the new TE using same procedure as in (ii).