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Our Changing Environment: Climate and Ecosystems (GEOB 102) - Fall 2014 Department of Geography The University of British Columbia Lab 1 Energy and temperature Last name: First name: Student #: Lab session: Due date: September 26 x This lab must be handed in by printing this handout and filling in the spaces provided for each ques- tion. x Please clearly highlight your final answers to the questions. x Submit the printed and completed version of this lab during the Friday lecture, on Sep 26. x Please read the Lab 1 Background information file available in the Lab section of the Connect web- site to help you complete this assignment. Introduction and objectives In this lab you will apply the energy balance equation to understand each of its components and deter- mine if a system is gaining or losing energy. You will become familiar with the conditions day or night, evaporation or condensation, or the direction of heat fluxes that result in a specific combination of magnitudes of the energy balance components positive or negative radiative and heat fluxes. You will also apply the two radiation laws learned in class Stefan-Bolzmann and Wien’ s displacement to fully understand their purpose and importance. Many of the topics covered later in the course will be di- rectly related to the simple principles of the energy balance equation and radiation laws. Question 1 - Daily radiation budget . The table below gives the five terms of the radiation budget, measured at about 1.2 m above the surface at Vancouver in September. Table 1 . Radiation budget components at surface (1.2 m above ground) in Vancouver, in W m -2 Time of day K↓ [W m -2 ] K↑ [W m -2 ] L↓ [W m -2 ] L↑ [W m -2 ] Q* [W m -2 ] α 02:00 0 0 351 425 -74 06:00 158 326 428 29 10:00 754 128 358 476 14:00 753 128 373 524 474 18:00 155 26 391 518 2 22:00 0 0 464 -88 a) Calculate the missing values for K↑ , L↓ and Q* at 6:00, 22:00 and 10:00, respectively, and fill the answer in Table 1 . Use the space below to show your calculations. https://www.coursehero.com/file/11614586/lab-1-energy-and-temperature/ This study resource was shared via CourseHero.com
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- 2 - b) Complete the albedo ( α ) column in Table 1 using 3 decimals for each answer and use the space be- low to show how you calculated it for 6:00 and 14:00. c) In one short sentence, comment about the variability of albedo throughout the day. d) In a short sentence, explain why L↑ is larger than L↓ for all values in Table 1 (hint: make an infer- ence about the temperature difference between the ground and the atmosphere). Question 2 - Energy balance . The table below represents some energy balance component es- timations at five different locations, at specific times of the day, in the surface of the ground. Table 2 . Radiation budget components at surface (1.2 m above ground) in Vancouver, in W m -2 Site K* [W m -2 ] L* [W m -2 ] L h [W m -2 ] S h [W m -2 ] C h [W m -2 ] R n [W m -2 ] Water Day / night Cooling / warming 1 880 -125 -210 -148 -43 2 0 240 0 -195 -45 3 280 345 -220 90 -18 4 0 -180 150 -40 29 5 120 -312 40 0 45 a) Fill the R n [W m -2 ] column of Table 2 and show your sample calculations for site 1 and 2 only in the space below. b) In the Water column of Table 2 , for each site, fill with an E if the water is evaporating, C if the water is condensing, and a big dash ( ) if there is likely no water in the system. c) Fill the column Day / night with a D if the measurements for each site were taken during the day, or N if they were taken during the night. d) In the Cooling / warming column of Table 2 , for each site, fill with a C if the surface is likely cooling, W if the surface is likely warming, and a big dash ( ) if there is no potential tempera- ture change. https://www.coursehero.com/file/11614586/lab-1-energy-and-temperature/ This study resource was shared via CourseHero.com
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