Problem Set 3 - Solutions - Name Discussion Section 100...

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Name: ___ / 100 points Discussion Section: Problem Set 3 ESPM 15: Introduction to Environmental Science Due in hardcopy at the beginning of lecture (9:10 am) on Friday, February 19, 2016 1. Residence time is a critical concept in biogeochemical box models. ___ / 25 points a. Define the term residence time. mass / flux out (5 pts) b. Put the following reservoirs in order of longest-to-shortest residence time of carbon: atmosphere, land plants, ocean, soil. What is the residence time of carbon in each? Ocean: 400 years Soils: 30 years Land plants: 10 years Atmosphere: 5 years (5 pts for order, 5 pts for residence times) c. When considering the relative residence times, why does it matter to humans if carbon from the atmosphere is transported into the ocean or into terrestrial sinks? Several potentially valid answers, graded for accuracy and completeness (10 pts) The residence time of the ocean is much longer than that of terrestrial sinks (decades vs hundreds of years). If carbon is stored in the ocean rather than in
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