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# EARTHSS 19 Study Guide - Fall 2019, Comprehensive Midterm Notes - Graph Of A Function, Lab Report, Flowchart

Department
Earth System Science
Course Code
EARTHSS 19
Professor
M. Morlighem
Study Guide
Midterm

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EARTHSS 19

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ESS 19 Fall 2018
Lab Report #1
Part I. Objectives
The objective for today’s lab is to practice using Stella by making a flowchart alongside
the table and graph associated with the data. By the end of the lab we should be able to add an
initial flow chart as well as numerous converters to this flowchart. We should also be able to add
connections showing what is dependent of one another. Besides from creating a flowchart we
should also be able to insert a graph, based on the flowchart, and know how to change the
properties, including title, units and axis labels. We should also be able to add a table and
navigate through the data which tells us about the flowchart.
Part II. Stella Flowchart
Part III. Variables
Top-Level Model:
Population(t) = Population(t - dt) + (growth) * dt
INIT Population = 7.5e9
UNITS: people
INFLOWS:
growth = IF consumption<production THEN growth_rate*Population ELSE 0
UNITS: people/Years
consumption = 5.5e5*Population
UNITS: colories/year
growth_rate = 1.2e-2
UNITS: year
production = 1e16
UNITS: calories/year
Part IV. Graph
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Part V. Explanation
This graph shows how population (number of people) changes over the time (years). In
this graph we can see how limited resources can affect population growth. For this graph we
can consider food as a limiting resource. From the connections on the flowchart we know that if
consumption is greater than production then the growth rate will be 0. This graph agrees with
that statement as shown by the halt in exponential growth around 75.25 years. This represents
how the population growth rate turns to 0 as resources become limiting. At 75.25, resources are
the limiting factor in population growth causing it to stay constant over time. I think this model
could be improved by showing a stop time of over 100 years. This could give information on
how population growth might start to decrease passed a certain time due to the lack of food
resources.
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Ess 19 Fall 2018
Lab report #2: Mono Lake
Part I. Objectives
The main objective for this lab is to get more practice making complex flow charts. By the end of
this lab we should be able build a flow chart with one stock and multiple converters with multiple
connection. We should also be able to make a graph with two y-axis. This lab opened up the
possibilities to understanding how a stock, like Mono Lake, can change with time depending on
multiple variables.
Part II. Stella Flowcharts
Figure 1.
The flow chart for Part A - Building a simple model of Mono Lake. This is a basic
model showing three flows in and two flows out. Stream in is dependent of water diverted to LA
and total Sierra runoff. Precipitation in is dependent on the are and the precipitation rate.
Evaporation out is dependent on the area and the evaporation rate.
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