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# NATS 1780 Study Guide - Midterm Guide: Sea Breeze, Pressure-Gradient Force, Lake Ontario

Department
Natural Science
Course Code
NATS 1780
Professor
Ian Lumb
Study Guide
Midterm

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NATS 1780 B & C Lab: Lake Breezes - Version 1.0, January 27, 2016
Purpose:
The purpose of this lab is to interpret actual observations using the lake-breeze model. This
model is described in the local/regional circulations lecture; it is also described in the course
textbook.
Background:
The data used in this lab comes from two sites:
The Oshawa Municipal Airport (YOO)
A buoy (45159) moored south of Ajax, ON in Lake Ontario
Data Analysis and Interpretation:
Locate the two sites - e.g., as a layer on a custom map. Capture a screenshot.
Estimate the distance between the two sites. Capture a screenshot.
Identify any signiﬁcant topographic features between the two sites.
Using historical data for YOO from the Weather Network, conﬁrm that May 26, 2014 was the
hottest day on record for 2014 before July 1, 2014. Capture a screenshot.
Using the calculator here, determine the sunrise/sunset times for Toronto on May 26, 2014.
(Assume differences in the sunrise/sunset times for Toronto and Oshawa are insigniﬁcant.)
Figure 1 is a plot of the temperature data for May 26, 2014 collected at each of the two sites.
The average value of the air temperature at the buoy is 10.8 °C.
Estimate the maximum value of the air temperature at the buoy relative to this average value.
Estimate the minimum value of the air temperature at the buoy relative to this average value.
Calculate the difference between the maximum and minimum values.
The average value of the air temperature at YOO is 20.7 °C.
Estimate the maximum value of the air temperature at YOO relative to this average value.
Estimate the minimum value of the air temperature at YOO relative to this average value.
Calculate the difference between the maximum and minimum values.
Which of the two sites experiences a greater variability in temperature?
Is this variability consistent with differential heating? (Differential heating between water versus
land, that is.)
Is this variability consistent with the lake-breeze model?
(Optional) The standard deviation in the temperature data at the buoy site is 1.5 °C. At YOO, the
corresponding value is 6.2 °C. Based on these measures of standard deviation:
Which of the two sites experiences a greater variability in temperature?