Radiation_in_low_latitudes_2010

Radiation_in_low_latitudes_2010 - Tropical Hazards...

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Tropical hazards discussion: http://www.cpc.noaa.gov/products/precip/CWlink/ghazards/ghaz.shtml Tropical Hazards Monitoring Global Satellite images: http://www.master.iag.usp.br/index.php?pi=N Global Monsoons: http://www.cpc.ncep.noaa.gov/products/Global_Monsoons/Global-Monsoon.shtml
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Tropical Hazards Monitoring Global Satellite images: http://www.master.iag.usp.br/index.php?pi=N Hawaii satellite images http://www.ssd.noaa.gov/goes/west/hi.html More on imagery and other info for the tropics http://www.ssd.noaa.gov/PS/TROP/ Tropical cyclones (very cool) http://cimss.ssec.wisc.edu/tropic2/
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Radiation Condition in Low  Latitudes
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Outline One of the most important factors that characterizes and differentiates tropical regions from extratropical regions is RADIATION In this lecture we will review concepts of energy transfer, energy balance, and blackbody radiation We will learn how to use and interpret these concepts for the atmosphere using satellite sensors We will discuss some important effects of clouds in the atmosphere in addition to other
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Energy Transfer mechanisms There are three basic processes of energy transfer : conduction, convection and radiation YOU CAN FIND MORE DETAILS IN GEOGRAPHY 110 Introduction to Meteorology www.icess.ucsb.edu/clivac/teaching1.htm
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Air is a bad conductor Conduction is an important process in a very thin layer of air near Earth’s surface.
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convection Transfer of heat by the mixing of a fluid: implies in mass transfer! 1. 1. Heat the Bottom Heat the Bottom 2. 2. Increase kinetic Increase kinetic Energy Energy 3. 3. Decrease density Decrease density (molecules become (molecules become more separated more separated when T ) when T ) 1. 1. Increase Increase buoyancy buoyancy 2. 2. Fluid less dense Fluid less dense rises rises 3. 3. Cools as it rises Cools as it rises
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Convection in the Atmosphere: occurs on several scales (very small – cm - to global) Surface Heating Surface Heating 1. 1. Heat the Bottom Heat the Bottom 2. 2. Increase Increase Temperature Temperature 3. 3. Decrease density Decrease density 4. 4. Increase Increase buoyancy buoyancy 5. 5. Fluid less dense Fluid less dense rises rises 6. 6. Cools as it rises Cools as it rises 7. 7. Cold air sinks Cold air sinks
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radiation radiation Radiation is the only form of energy that can propagate without a transfer medium. In other words, the transfer of energy by radiation can occur through empty space.
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1.Radiation is emitted as eletromagnectic waves by all matters with temperature above 0 o K 2.Emitted radiation depends on temperature The surface of the Sun is hot and emits radiation on the Visible wavelength (VIS), UV, IR This is a tree during a very dark night A tree does not emit visible light This is the infrared radiation emitted by the same tree and captured by sensors of a camera Sun and Stars THIS IS THE VIS LIGHT THIS IS THE VIS LIGHT OF THE SUN REFLECTED OF THE SUN REFLECTED BY THE TREES, THE BY THE TREES, THE SKY, THE GROUND AND SKY, THE GROUND AND CLOUDS CLOUDS
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Intensity and wavelengths of emitted radiation UV, VIS IR - heat CO 2 , CH 4 , H 2 0
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