a. What is the residence time of water in the atmosphere? Two facts that are relevant: the annual total global precipitation, over both ocean and land, is 2.61 mm/day. The mass of water in the atmosphere is 15.5x10¹⁵ kg.(As an ancillary calculation, you should be able to demonstrate that if condensed to a uniform layer, the atmosphere contains the equivalent of 25 mm of water.)

b. Perform the same calculation for residence time of water in the world’s oceans.