Description: Der Strahlungsfluss von der Sonne durch die Erdatmosphaere kann mit den herkoemmlichen Strahlungstransfermodellen nur fuer die beiden Faelle eines wolkenlosen und eines vollstaendig bedeckten Himmels berechnet werden. Fuer den Fall einer teilweisen Bedeckung ist man auf die Parametrisierung des Strahlungsflusses angewiesen. Diese Parametrisierung muss ausgehen von den beiden berechenbaren Faellen, wobei die durchbrochene Bewoelkung dazwischen geeignet interpoliert werden muss. Ausgehend von gemessenen Daten und der Simulation des Strahlungsflusses soll eine solche Parametrisierung in dem vorliegenden Projekt hoehenabhaengig fuer die Troposphaere und die Stratosphaere abgeleitet werden.
Types:
SupportProgram
Tags:
Messgerät
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Bewölkung
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Solarstrahlung
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Meteorologischer Parameter
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Photolyse
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Radiometrie
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Solardaten
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Mathematisches Modell
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Messdaten
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Simulationsmodell
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Stratosphäre
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Troposphäre
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Modellierung
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Atmosphäre
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Atmosphärenchemie
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Atmospheric-Chemistry
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Cloud-Cover
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Photolysis-Frequencies
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Radiative-Transfer-Model
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Radiometer-Measurements
?
Region:
Nordrhein-Westfalen
Bounding boxes:
6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0
Language: Deutsch
Organisations
Time ranges:
1997-10-01 - 2000-09-30
Alternatives
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Language: Englisch/English
Title: Parametrization of the Photon Flux for a Partly Covered Sky
Description: During the last decade a number of radiative transfer models were developed which are capable of calculating the photon flux for clear sky conditions as well as for a completely covered sky. All these models depend on the same basic physical processes. For a broken cloud coverage of the sky the algorithms developed cannot be applied to determine the radiative flux, since additional processes, e.g. the reflection of the photons at the clouds' sides, have to be taken into account. Only very complex and time consuming models, which cannot be used for routine calculations, are presently able to include these processes. To overcome these problems a parametrization scheme will be included in the existing models with which the photon flux can be determined for a partly covered sky. This parametrization must depend on measured data of the UV radiation. In the present projekt data from balloon or aircraft borne radiometers will be compared with model calculations for a clear and a totally covered sky. The parametrization then will be a combination of the linear model data determined in this way. The main subject of the project is the simulation of the photon flux within the troposphere and the lower stratosphere to deduce rate coefficients for the various photodissociation processes occuring in the atmosphere. Therefore, the parametrization algorithm must be altitude dependent and has to take into consideration whether the clouds are below or above the specified height.
https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=58104
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