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# ---
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# latex_metadata:
# chead: Quiz questions, January 18, 2020
# lhead: E340 Day 5
# pdf_metadata:
# text1: html header success
# ---
# %% [markdown] ctype="question" qnum="1"
# 1. Suppose we have a one layer atmosphere with ε=1 above a black
# surface as in Dessler Fig. 4.6. Does adding a second opaque (ε=1)
# layer (Dessler Figure 4.7) increase the greenhouse effect, decrease
# the greenhouse effect, or leave the greenhouse effect unchanged?
#
# A. increase
#
# B. decrease
#
# C. no change
# %% [markdown] ctype="question" qnum="2"
# 2. Suppose a planet's average surface temperature is about 320 K. In the one-layer
# semi-transparent atmosphere shown below (and seen in your reading),
# what would the approximate long-wave atmospheric emissivity ε need to be in
# order for $T_g$=320 K, if the average shorwave flux was $I_0=400\ W\,m^{-2}$. (Hint, look at equations 5-6 in the reading).
#
# A. 0.54
#
# B. 0.65
#
# C. 0.77
#
# D. 0.88
#
# E. 0.95
# %% [markdown] ctype="question" qnum="2"
# 
# %% [markdown] ctype="question" qnum="3"
# 3. Given a one-layer atmosphere like problem 2, but with $\epsilon=0.8$, $T_G$=306 K, $T_1$=258 K, $I_0$ = 300 $W\,m^{-2}$, calculate the greenouse effect. (choose the closest number)
#
# A. -121 $W\,m^2$
#
# B. +121 $W\,m^2$
#
# C. +197 $W\,m^2$
#
# D. +221 $W\,m^2$
#
# E. +324 $W\,m^2$
# %% [markdown] ctype="question" qnum="4"
# 4. According to the figure in Trenberth et al. 2009 below, how big is the Earth's greenhouse effect?
#
# A. 85 $W\,m^{-2}$
#
# B. 157 $W\,m^{-2}$
#
# C. 254 $W\,m^{-2}$
#
# D. 285 $W\,m^{-2}$
#
# E. 333 $W\,m^{-2}$
# %% [markdown] ctype="question" qnum="3"
# 
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