ERTH 430:
Fluid Dynamics
in Earth Systems
Pre-class Quiz #2:
Questions about Lab #1, Part I

This is a "preview" version of Pre-class Quiz #2. The preview version is suitable for printing and leisurely inspection before you submit your answers to the interactive or "live" version—that is, the real thing. When you feel ready to submit your answers, go to iLearn's ERTH 430 "Pre-class Quizzes" section, select the interactive version, and follow its instructions.

(Responses must be submitted via iLearn by 9 a.m. on Friday, Oct. 27.

Description: The questions below are based on Lab #1: The Vertical Pressure Gradient Force/Mass in the Atmosphere and Ocean, Part I: Vertical Profiles of Pressure, on which you'll begin work on Friday, Oct. 27.

Questions:


(1) Multiple Choice. Lab #1, Part I asks you to plot and describe vertical profiles of several atmospheric and oceanic quantities contained in files provided with the lab. How will you plot these data? (Pick the one correct answer.)

  1. By hand on graph paper
  2. Using a MATLAB program written to read the ordinary text files containing the data
  3. Using Microsoft Excel, which reads CSV (comma-separated variable) files containing the data
  4. Using the Integrated Data Viewer (IDV), which can read CSV files containing the data

(2) Multiple Choice. Lab #1, Part I asks you to plot and describe vertical profiles of several atmospheric quantities contained in files provided with the lab. These quantities were measured by radiosondes carried by balloons from the Earth's surface high into the atmosphere. Which one of the following quantities is not measured by radiosondes and doesn't appear in the data files? (Pick the one correct answer.)

  1. Atmospheric pressure
  2. Altitude above sea level
  3. Air temperature
  4. Water vapor mixing ratio
  5. Air density
  6. None of the above—all are measured by the radiosonde and are included in the data files

(3) Multiple Choice. Lab #1, Part I asks you to plot and describe vertical profiles of several oceanic quantities in a file provided with the lab. These quantities were measured by instruments that drift around the ocean as part of the ARGO network, sinking and then rising again to radio their measurements back to orbiting satellites. Which one of the following quantities is not measured by these instruments and doesn't appear in the file? (Pick the one correct answer.)

  1. Water pressure
  2. Depth below the sea surface
  3. Water temperature
  4. "Practical" salinity
  5. Water density
  6. None of the above—all are measured by the drifting instruments and included in the data file

(4) Multiple Answer. Lab #1, Part I asks you to plot vertical profiles of pressure in the atmosphere and the ocean. Which of the following aspects of these profiles does the lab ask you do describe? (Pick all correct answers—there might be more than one.)

  1. How pressure varies with increasing altitude (in the atmosphere) and increasing depth (in the ocean)
  2. The sign of the vertical pressure gradient
  3. How the vertical pressure gradient varies with increasing altitude (in the atmosphere) and increasing depth (in the ocean)
  4. How the acceleration of gravity varies with increasing altitude (in the atmosphere) and increasing depth (in the ocean)
  5. The extent to which the vertical pressure-gradient force/mass balances the force/mass of gravity

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