RNR 1001 Chapter : RNR 1001 Feb 24th 14
Document Summary
Evidence of global warming: only natural forcing factor model v. s. Actual data for temperature all around the world. Peru 1100m from 1978 to 2002; shepard glacier, mt; jakobshavn isbrea, Greenland 440000m from 1851 to 2006; gangotiri, india 1100m from 1780 to 2001. Important concepts: positive feedback- warming, ice melting, increased absorption by water and methane release, increased warming . Enhancement of the effect reflection of incoming radiation into space, decreased warming dampening: negative feedback- warming, increase in deserts and dust storms, increased of the effect. Ground water in aquifers is typically recharged from precipitation, although groundwater flow from nearby streams is also possible: recharge rates depend on permeability (meters per week to centimeters per century) Consequences: decreased water yield to wells; well abandonment and re- drilling; subsidence (80percent of subsidence in u. s. ) Water is critical to most ecosystems, but is a defining characteristic of wetlands. Historically one our most misunderstood and degraded renewable resources.
