REVIEW QUESTIONS/STUDY GUIDE
for 1st HOUR EXAM (10 October 1997)
ATM OCN 100: WEATHER & CLIMATE

Lecture 3 - Fall 1997

In studying for the exam, review your class notes, the assigned readings in the text including those figures and figure captions emphasized in class and your homework. If you are still not sure, please ask questions before the exam, either during office hours, by appointment or by e-mail.

TOPICS COVERED FOR FIRST HOUR EXAM

• SYNOPTIC WEATHER OBSERVATIONS & ANALYSIS
• THE TOOLS
  • Weather Instruments to include surface, satellites, radar, radiosondes.
  WEATHER MAPS
  • Isobars and Isotherms

ATMOSPHERIC COMPOSITION

• PRESENT COMPOSITION (especially near the surface)
• VERTICAL DISTRIBUTION
  • According to Chemical Species (Homosphere and Heterosphere)
  • According to Charged Particles (Ionosphere and Magnetosphere)
• HISTORICAL EVOLUTION OF ATMOSPHERE

AIR PRESSURE

• DEFINITION
• INSTRUMENTS
• SEA LEVEL VALUES & VARIATIONS in Time and Space
• VERTICAL DISTRIBUTION OF PRESSURE

AIR TEMPERATURE

• DEFINITION
• INSTRUMENTS
• NEAR-SURFACE VALUES & VARIATIONS in Time and Space
• DEGREE DAY UNITS
• VERTICAL DISTRIBUTION of TEMPERATURE
• NOMENCLATURE ASSOCIATED WITH THE ATMOSPHERIC TEMPERATURE PROFILE

ENERGETICS: ENERGY & POWER

• ENERGY FORMS
• ENERGY AND POWER UNITS
• CONSERVATION OF ENERGY
• ENERGY TRANSPORT MECHANISMS

• RADIATION SPECTRUM
• RADIATION LAWS
• SHORT WAVE vs. LONG WAVE (i.e., Solar vs. Terrestrial)
• ENERGY BUDGETS
  • PLANETARY
  • LOCAL

GAS LAWS & THERMODYNAMICS

• KINETIC THEORY
• EQUATION OF STATE
• DALTON'S LAW
• FIRST LAW OF THERMODYNAMICS
• RESPONSE OF AIR PARCELS TO VERTICAL MOTIONS

WATER & THE HYDROLOGIC CYCLE

• RESERVOIRS & FLUXES
• PROPERTIES OF WATER
• HUMIDITY VARIABLES

Are you able to answer the following?

• Name three weather elements that meteorologists routinely measure.
• What weather elements are measured by a radiosonde?
• Compare the observation capabilities of polar orbiting and geosynchronous satellites. What three types of satellite images are available to the meteorologist and how can these products be used?
• How is radar used to sense the weather? Briefly describe the principles utilized by conventional and Doppler weather radar units. How does Doppler radar differ from conventional weather radar systems?
• Why is the atmosphere considered a vital resource? What is the composition of the present earth's atmosphere? Dry air? What are some of the common variable gases? Which gases are mainly responsible for the "greenhouse effect"? Which gas is most responsible for shielding us from excessive ultraviolet radiation?
• How does the composition of the present earth's atmosphere change with height? What is the "homosphere" and "heterosphere"? At what approximate levels are these layers found? Why is most of the ozone found at altitudes near 30 km? What is the meteorological and human significance of stratospheric ozone?
• What is meant by the "Greenhouse Effect"?
• What are some of the present plausible scientific theories concerning the origin and evolution of the earth's atmosphere and oceans?
• What ideas have been advanced concerning the formation of the present levels of atmospheric oxygen? What natural processes add free (diatomic) oxygen to the atmosphere? What processes remove it?
• How is atmospheric nitrogen added to and removed from the atmosphere?
• Why are atmospheric carbon dioxide and ozone important? What impact might human activity have on the concentration of these gases? What are several different mechanisms that have contributed to the nearly exponential increases in atmospheric carbon dioxide in the last century?
• How do the atmospheres (or lack) of our neighbors in space - the moon, Mercury, Venus, Mars, and so forth - differ from the Earth's atmosphere? Why?
• What is atmospheric pressure, and how is it measured? What are the defining pressure units? What is the typical value of sea level pressure, and approximately how large is the range between the lowest and highest recorded sea level pressure observations?
• How does atmospheric pressure vary with height? Why does this change occur? What are some implications, especially for humans?
• What are isobars on surface weather maps? Why is the display of isobars important to the meteorologist? Why is station pressure corrected to mean sea level before the surface weather map is analyzed?
• What is air temperature, and how is it measured? What precautions are necessary when making air temperature observations? What is a typical hemispheric value of near surface air temperature and what is the approximate range between the lowest and highest recorded surface temperature observations?
• How do the Fahrenheit, Celsius and Kelvin temperature scales compare? Why is the Kelvin temperature scale used?
• How does the near-surface air temperature typically vary throughout the day? Why? When does the coldest and warmest days of the year typically occur in midlatitudes? Why?
• What are isotherms on weather maps?
• How is the average temperature calculated for a single day? What are heating degree day units? Cooling degree day units? Of what practical value are these units?
• What is the significance of the wind chill equivalent temperature? What factors are involved in its determination? Given a wind chill table, can you determine the wind chill equivalent temperature with the provided information? Can you interpret your results in terms of human comfort?
• What is meant by a temperature lapse rate? What is a temperature inversion? an isothermal layer? What is a lapse condition?
• How does the temperature of the earth's atmosphere typically vary with height? How are the troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause and thermosphere defined? How are the boundaries between each of these regions identified? Where are these layers or levels typically located? Why is the air temperature relatively warm at the earth's surface and at approximately 50 km altitude?
• What is the magnetosphere? How is it produced? What is the aurora borealis? In what regions of the atmosphere are aurora usually found? What processes produce the aurora? What is the solar wind?
• Where is the ionosphere located? How is it maintained? What is its significance?
• What is energy? Why is the concept of energy useful? What four major forms (internal, gravitational potential, kinetic and latent energy) does energy take in the atmosphere? What is meant by energy transformations?
• By what three basic ways is energy transferred? Do you understand the differences between radiation, conduction, and convection, to include the media needed for energy transfer by that mode?
• What is wind-chill and wind-chill equivalent temperature and why are these quantities significant? What factors are needed to determine the wind-chill equivalent temperature? Given these factors, determine the wind-chill equivalent temperature from the provided table.
• What is the electromagnetic spectrum? Rank the regions of the spectrum according to wavelength.
• Can you apply the fundamental radiation laws to determine how much the radiation emitted from an object will change if its absolute temperature were changed? (For example, doubled or tripled?) How does the wavelength of maximum radiation emission vary with the object's absolute temperature?
• Compare the characteristics of solar (or short wave) and infrared (or long wave) radiation.
• Why do many inhabitants of the earth experience the seasons?
• Can you describe the apparent path of the sun across the sky for a mid latitude location (for example, Madison at 43° N) for the solstices and equinoxes. Relate the length of daylight to this path.
• What is the inverse square relationship? How does the incident flux change if the distance from the source were doubled, halved, and so forth? What implications does this relationship have upon the energy budgets of the Earth, Mars and Venus?
• How does the intensity of the solar radiation received on a surface depend upon the angle between this surface and the beam of radiation? How does this relationship affect the solar radiation incident upon the earth's surface?
• What are the equinoxes and the solstices? On approximately what dates do these events occur at present? What influence do they have on the timing and the intensity of the seasons? In the Northern Hemisphere? Southern Hemisphere?
• How is the solar constant defined? What is the currently accepted value of the solar constant for the earth?
• Do you thoroughly understand the difference between transmission, reflection and absorption of radiation? If you get reflection of solar radiation confused with emission of long wave radiation from the earth, you do not understand these terms.
• What is albedo? Compare the albedo of various surfaces. Why is a knowledge of albedo important?
• What is the global heat budget? What happens to the incoming solar energy entering the top of the atmosphere? How is the atmosphere principally heated? In what ways is energy transferred from the earth's surface to the atmosphere? How is energy emitted from the earth-atmosphere system to space?
• In what ways is energy transferred from the earth's surface to the atmosphere? How is energy emitted from the earth-atmosphere system to space?
• How do the annual average incoming and outgoing radiation curves vary with latitude? Of what importance is this relationship? (That is, why must a poleward transport of energy exist?) How is energy transported poleward to compensate for the latitudinal radiation imbalances?
• What does the equation of state say? How are the variables of state of a gas related? That is, if the pressure of an air parcel were kept constant, how would the density vary if the temperature changed? If the density were kept constant, how would the pressure vary if the temperature changed?
• What is Dalton's Law of partial pressures? Why is this relationship important to meteorology?
• What does the First Law of Thermodynamics say? How does it apply to the atmosphere? What are the sources of heat? What produces work on the air parcel? What is meant by an adiabatic process? How does the air parcel respond to lifting and sinking in the atmosphere? What is the approximate value of the dry adiabatic lapse rate?
• Can you describe the hydrological cycle? What is the largest reservoir of the water substance? the smallest? How does the total amount of precipitation compare with that of evaporation in the annual global water budget?
• Why do large bodies of water heat and cool more slowly than land? With regard to this difference in heating rates, four reasons are significant.
• What is atmospheric humidity, and how is it measured? What are typical parameters of atmospheric humidity?
• Define vapor pressure and saturation vapor pressure; mixing ratio and saturation mixing ratio, relative humidity, dewpoint and wet bulb temperature. Why is the relative humidity usually higher at night than in mid-day?
• What is apparent temperature and why is it significant? What factors are needed to determine the apparent temperature? Given these factors, determine the apparent temperature from the provided table. What do your answers indicate about human comfort?

Last revision 1 October 1997