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Exam_2_2008_A_key - EAS 1600 INTRODUCTION TO ENVIRONMENTAL...

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EAS 1600 - INTRODUCTION TO ENVIRONMENTAL SCIENCES Fall, 2008 Exam 2 – 10/27/08 < Answer all Questions < Show all your work and be sure and report units where appropriate < Place your name on each page < This is a closed-book exam; all are expected to comply with Georgia Tech Honor Code I am aware and in compliance with the Georgia Tech Honor Code and I agree to abide by the grading policies of this class. Signature: ____________________________________________________________ Print Name: ___________________________________________________________ Lab Section: ___________________ A 1
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1. How does ocean photosynthesis impact atmospheric CO 2 ? (5 pts) Photosynthesis consumes CO 2 in the surface ocean. This increases uptake of CO 2 into the ocean. Much of the organic carbon that is formed is exported to the deep ocean. This is the biological pump which takes atmospheric CO 2 to the deep ocean. 2. If atmospheric CO 2 levels continue to increase do you expect ocean photosynthesis rates to increase? Why or Why Not? (5 pts) NO, nutrient levels are limiting factor for photosynthesis. 3. You are at the top of Mt. Sherman in Colorado at an altitude of 4.6 km and an air temperature 5 o C. A helium balloon with a mass of 50 kg just floats at the top of the mountain. What is the volume of the balloon? (10 pts) Draw a diagram of forces is a good place to start and show buoyancy counterbalances the weight of the balloon. B=w ρ air V ball g = m ball g V ball = m ball/ ρ air Need density but first must calculate pressure and use MKS units p = 10 5 Pa e -(4.6/8) p = 5.63 x 10 4 Pa ρ air = p/(R m T) = 5.63 x 10 4 Pa/((287 J/K kg)(278 K) = 0.705 kg/m 3 V ball = 70.9 m 3 2
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4. Tropical meteorology is dominated by the circulation described by a Hadley Cell.
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