climatic changes during an average human lifetime, climates do not appear to change. however, they...
TRANSCRIPT
Climatic ChangesClimatic Changes
During an average During an average human lifetime, human lifetime, Climates do not Climates do not
appear to change.appear to change.However, they are However, they are in a constant state in a constant state
of changeof change
Long Term Long Term Climatic ChangesClimatic Changes
Ice AgesIce AgesInterglacial IntervalsInterglacial Intervals
Ice AgesIce Ages- period of - period of
extensive glacial extensive glacial coverage. There coverage. There
have been several have been several glacial advances glacial advances
and retreatsand retreats
Interglacial Interglacial IntervalsIntervals- Warm - Warm periods periods between between
glaciationglaciation
Short TermShort TermClimatic ChangesClimatic Changes
SeasonsSeasonsEl NinoEl Nino
SeasonsSeasons- regular - regular
variations in variations in daylight, daylight,
temperature, and temperature, and weather patternsweather patterns
El NinoEl Nino- Weakening of the - Weakening of the equatorial current equatorial current
brings warmer brings warmer waters to the west waters to the west
coast of coast of South AmericaSouth America
Evidences of Evidences of Climatic ChangeClimatic Change
- Tree Rings- Tree Rings- Ice Core - Ice Core SamplesSamples- Fossils- Fossils- Radio Carbon - Radio Carbon SamplesSamples
Causes for Causes for ChangeChange
Human Human ActivityActivity
- Pollution may - Pollution may aid global aid global warmingwarming
Volcanic Volcanic ActivityActivity
- Dust blocks - Dust blocks solar radiation solar radiation
lowering lowering global global
temperaturestemperatures
Solar ActivitySolar Activity- increased solar - increased solar activity causes activity causes
increased global increased global temps. 11yr cycletemps. 11yr cycle
Earth’s OrbitEarth’s Orbit- More circular - More circular orbit = cooler orbit = cooler global temps.global temps.
100,000 yr 100,000 yr cyclecycle
Earth’s Earth’s WobbleWobble
- Reversal of - Reversal of Earth’s Tilt Earth’s Tilt reverses reverses seasons.seasons.26,000 yr 26,000 yr
cyclecycle
