GG 281 – Lab 1: Radiation Assigned: September 13-16, 2021 Due: September 27-30, 2021 Short Answer 1. What do the radiation laws tell us about the emission of radiation? How and why is the radiation emitted by Earth different from that emitted by the sun? (5 Marks) 2. What are the differences between the atmosphere’s radiative properties for shortwave radiation and its radiative properties for longwave radiation? (4 Marks) 3. How do the radiative properties of gases (Figure 5.15) help explain a) the greenhouse effect and b) the temperature structure of the atmosphere? (6 Marks) 4. What causes seasons? (4 Marks) 5. How would you describe and account for the relationship between latitude and seasonality? (5 Marks) Quantitative 6. Calculate the noon sun angle for each of the following. (9 Marks) a) 57° S on 9 January b) 12° N on 30 April c) 39° N on 15 November 7. a) A soil surface has a temperature of 31°C and an emissivity of 0.92. How much radiation is emit- ted from this surface? (3 Marks) b) What is the wavelength of maximum emission for this surface? (3 Marks) GG281 Lab Week 1 Lab Expectations and Lab 1 Intro TAs: Maude Auclair (aucl9080@mylaurier.ca), Mikhail Mack (mack1375@mylaurier.ca), Iain Thomson(thom6030@mylaurier.ca) 1 Lab 1 Questions Review Questions (Short answer, full sentences) 1. What do the radiation laws tell us about the emission of radiation? How and why is the radiation emitted by Earth different from that emitted by the sun? (5 marks) 4. What are the differences between the atmosphere’s radiative properties for shortwave radiation and its radiative properties for longwave radiation? (4 marks) 5. How do the radiative properties of gases (Figure 5.15) help explain a) the greenhouse effect and b) the temperature structure of the atmosphere? (6 marks) 7. What causes seasons? (4 marks) 8. How would you describe and account for the relationship between latitude and seasonality? (5 marks) Quantitative Questions (show your work) 5. Calculate the noon sun angle for each of the following. (9 marks) a) 57º S on 9 January b) 12 º N on 30 April c) 39 º N on 15 November 6. a) A soil surface has a temperature of 31ºC and an emissivity of 0.92. How much radiation is emitted from this surface (? b) What is the wavelength of maximum emission for this surface? (6 marks) Total Marks: 39 Due two weeks from today (Sept. 27) 2 Lab 1 Questions Review Questions (Short answer, full sentences) 1. What do the radiation laws tell us about the emission of radiation? How and why is the radiation emitted by Earth different from that emitted by the sun? (5 marks) Section 5.2 3 Lab 1 Questions Review Questions (Short answer, full sentences) 1. What do the radiation laws tell us about the emission of radiation? How and why is the radiation emitted by Earth different from that emitted by the sun? (5 marks) Section 5.2 4 Lab 1 Questions Review Questions (Short answer, full sentences) 1. What do the radiation laws tell us about the emission of radiation? How and why is the radiation emitted by Earth different from that emitted by the sun? (5 marks) Section 5.2 Shorter WL and Higher Emission @ Higher Temps Longer WL & Lower Emission @ Lower Temps Citation: https://www.optotherm.com/infrared-planck.htm 5 Lab 1 Questions Review Questions (Short answer, full sentences) 4. What are the differences between the atmosphere’s radiative properties for shortwave radiation and its radiative properties for longwave radiation? (4 marks) 6 Lab 1 Questions Review Questions (Short answer, full sentences) 5. How do the radiative properties of gases (Figure 5.15) help explain a) the greenhouse effect and b) the temperature structure of the atmosphere? (6 marks) 7 Lab 1 Questions Review Questions (Short answer, full sentences) 5. How do the radiative properties of gases (Figure 5.15) help explain a) the greenhouse effect and b) the temperature structure of the atmosphere? (6 marks) 8 Lab 1 Questions Review Questions (Short answer, full sentences) 7. What causes seasons? (4 marks) 9 Lab 1 Questions Review Questions (Short answer, full sentences) 7. What causes seasons? (4 marks) 10 Lab 1 Questions Review Questions (Short answer, full sentences) 8. How would you describe and account for the relationship between latitude and seasonality? (5 marks) 11 Lab 1 Questions Quantitative Questions (show your work) 5. Calculate the noon sun angle for each of the following. (9 marks) a) 57º S on 9 January b) 12 º N on 30 April c) 39 º N on 15 November 12 Lab 1 Questions Quantitative Questions (show your work) 5. Calculate the noon sun angle for each of the following. (9 marks) a) 57º S on 9 January b) 12 º N on 30 April c) 39 º N on 15 November 13 Lab 1 Questions Quantitative Questions (show your work) 5. Calculate the noon sun angle for each of the following. (9 marks) a) 57º S on 9 January b) 12 º N on 30 April c) 39 º N on 15 November Calculation Hints: First determine the season for the hemisphere given the date For latitudes greater than the Tropic of Cancer or Tropic of Capricorn • Summer in Southern Hemisphere (Subtract) • Winter in Northern Hemisphere (Add) • Summer in Northern Hemisphere (Subtract) • Winter in Southern Hemisphere (Add) For latitudes between the Tropic of Cancer and the Tropic of Capricorn, subtract whichever degree (latitude or subsolar) is larger so that the answer in step 1 always positive. 14 Lab 1 Questions Quantitative Questions (show your work) 6. a) A soil surface has a temperature of 31ºC and an emissivity of 0.92. How much radiation is emitted from this surface? b) What is the wavelength of maximum emission for this surface? (6 marks) 15 Lab 1 Questions Quantitative Questions (show your work) 6. a) A soil surface has a temperature of 31ºC and an emissivity of 0.92. How much radiation is emitted from this surface? b) What is the wavelength of maximum emission for this surface? (6 marks) 16

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