PUBH 3132 Lecture Notes - Lecture 1: Bioassay, Metastasis, Aquifer
Document Summary
Humans represent one player in the global ecosystem, but we have a massive impact on the environment. Chapter 2: the science and methods of environmental health. Fate: chemical or physical transformations of contaminants in the environment. Transport: movements of contaminants within or between environmental media. Bioconcentration: movement into fatty tissues of organisms. Bioaccumulation: building up over time in individual organism. Biomagnification: building up over time, across levels in a food chain. Half life in air, water or soil. Earth absorbs energy from sun, radiates some of this energy as heat. Trace gases in troposphere absorb this heat. Natural greenhouse gases: water vapor, carbon dioxide, methane, nitrous oxide, ozone. Includes layer where concentration of ozone is much higher. Absorbs much of incoming ultraviolet radiation in sunlight. Temperature inversion: cooler surface air trapped below warmer air above. Mixing and high pollutant concentrations at ground level. Global hydrologic cycle connects water on local, global sales.
