Lecture 14 - Lecture 14 THE BIOSPHERE Learning Objectives...

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Lecture 14 Lecture 14 THE BIOSPHERE THE BIOSPHERE
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Learning Objectives To indicate the importance of sun ray in influencing global air circulation patterns, weather and regional climates To describe the ocean circulation patterns To describe several biospheres in which organisms live in.
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Learning Outcomes At the end of the lecture, students will be able to: Describe the importance of air circulation patterns which define weather and regional climate Describe the interactions among ocean currents, air circulation patterns and landforms which produce regional climate which affect the distribution and dominant features of ecosystems Describe the characteristics of major biogeographic realms such as land and water and the interaction abiotic and biotic factors
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Fig. 43-2, p.756
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Fig. 43-3, p.756
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Climate the average weather conditions (such as cloud cover, temperature, humidity and wind speed over time) Arises from variations in solar radiation due to Earth’s daily rotation and annual path of the sun , distribution of the land masses and seas and land elevations .
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What has sun’s radiation got to do with the global climate? Earth is a sphere ; therefore the sun's rays are more direct near the equator and spread out near the poles. Therefore the tropics are warmer than the temperate areas.
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What has sun’s radiation got to do with the global climate? Only half of the sun rays go through the earth. Ozone layers and O 2 molecules in the upper atmosphere absorb most UV radiation. The penetrating rays warm the earth’s surface. Latitudinal differences in the amount of solar radiation reaching the earth produce global air circulation patterns .
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What has sun’s radiation got to do with the global climate? Differences in solar heating at different latitudes produced temperate zones. Earth’s annual rotation around the sun introduces seasonal changes in winds, temperatures & rainfall.
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The Biospheres
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The ocean Ocean’s water covers 71% of the earth’s surface. Surface ocean currents & global air circulation patterns – influence regional climates & help distribute nutrients marine ecosystems. Currents – rapid flows of water. Latitudinal & seasonal variations in solar heating – effect movement of water & the formation of currents.
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Ocean Currents & Their Effect
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Elevations influence regional climates with respect to monsoon rains, winds and rain Air circulation patterns influence monsoons Winds and ocean currents – affects the growth & distribution of primary producers in ecosystems.
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Rain Shadows
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Biomes Animals and plants show great diversity from one global region to another. Biogeography – the study of global distribution
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Lecture 14 - Lecture 14 THE BIOSPHERE Learning Objectives...

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