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1 A Radiation Course based upon Numerical Methods Björn-Martin Sinnhuber & Stefan Bühler University of Bremen Summer semester 2005

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2 Björn-Martin Sinnhuber NW1 - W3190 Stefan Bühler NW1 - N3371 Contact

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3 Aim and Scope of the Course The aim of the course is to: understand the processes and learn how to calculate the transfer of radiation in the atmosphere. Main applications of atmospheric radiative transfer are: Impact of radiation on climate Atmospheric remote sensing

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4 Organisation of the Course The course will consist of: About 7 introductory lectures About 7 practical exercises at the computers For the Diploma students: Kriterium um einen Schein übererfolgreiche Teilnahme zu bekommen: Aktive Teilnahme an den praktischen Übungen (höchstens zweimal fehlen)

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5 Outline of the Next Few Weeks 1.Introduction 2.Radiative Transfer, Part 1 3.Spectroscopy 4.Radiative Transfer, Part 2

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6 Introduction What are numerical methods? Why use numerical methods? How does this look like in practise?

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7 SZA = 87.0°

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8 SZA = 89.5°

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Blackbody Radiation

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Planetary Equilibrium Temperature Heating by absorption of (shortwave) solar radiation Cooling by emission of (longwave) terrestrial radiation

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Planetary Equilibrium Temperature Incoming solar radiation needs to be balanced by outgoing terrestrial radiation. Solar constant at top of Earths atmosphere: 1376 W m -2 Outgoing longwave radiation:

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A Simple Model of the Greenhouse Effect Assumptions: Single layer atmosphere with constant temperature Atmosphere is transparent for shortwave solar radiation Atmosphere is a blackbody for longwave radiation

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Outgoing Longwave Radiation

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