Climatic Changes During an average human lifetime, Climates do not appear to change. However, they are in a constant state of change.

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Presentation transcript:

Climatic Changes

During an average human lifetime, Climates do not appear to change. However, they are in a constant state of change

Long Term Climatic Changes Ice Ages Interglacial Intervals

Ice Ages - period of extensive glacial coverage. There have been several glacial advances and retreats

Interglacial Intervals - Warm periods between glaciation

Short Term Climatic Changes Seasons El Nino

Seasons - regular variations in daylight, temperature, and weather patterns

El Nino - Weakening of the equatorial current brings warmer waters to the west coast of South America

Evidences of Climatic Change

- Tree Rings - Ice Core Samples - Fossils - Radio Carbon Samples

Causes for Change

Human Activity - Pollution may aid global warming

Volcanic Activity - Dust blocks solar radiation lowering global temperatures

Solar Activity - increased solar activity causes increased global temps. 11yr cycle

Earth’s Orbit - More circular orbit = cooler global temps. 100,000 yr cycle

Earth’s Wobble - Reversal of Earth’s Tilt reverses seasons. 26,000 yr cycle