Biology 2483A Lecture Notes - Lecture 13: Crich, Upwelling, Industrial Revolution
9 Jun 2016
School
Department
Course
Professor
Document Summary
Global ecology major focus to study environmental effects of human activities. 99% of global carbon is in sediments and rock, the most stable pool. Ocean surface water takes up co2 by diffusion c transferred to deeper water mostly as detritus and carbonate shells. Upwelling bring c-rich water to the surface, releasing co2 to the atmosphere. Soils contain twice as much c as plants; co2 exchanged by photosynthesis and respiration. Anthropogenic release of c to the atmosphere from the terrestrial pool results from land use change mostly from deforestations and fossil fuel burning. Before the industrial revolution, 2 fluxes were roughly equal roughly doubles in the last 30-40 years. Removing forest canopy warms the soil increases rates of decomposition and respiration. Burning trees also releases co2 and small amounts of co and ch4. Major deforestation shifted from mid latitiudes to the tropics. Older forests may not have as great of a capacity for co2 uptake.
