Description: Das OH-Radikal ist das wichtigste Oxidationsagens in der Troposphaere. Die troposphaerische OH-Konzentration wird im wesentlichen durch Ozonphotolyse im UV-Bereich bestimmt. Die Vertikalverteilung der OH-Primaerproduktion aus der Ozonphotolyse in der Troposphaere soll gemessen werden. Dazu werden hoehenaufgeloeste Messungen des spektralen UV-Strahlungsflusses (Aktinischer Fluss), der Wasserdampf- und der Ozonkonzentration an Bord eines Forschungsflugzeuges durchgefuehrt. Zusaetzlich wird die Wellenlaengenabhaengigkeit der O(1D)-Quantenausbeute bei tiefen, fuer die obere Troposphaere relevanten Temperaturen bestimmt.
Types:
SupportProgram
Tags:
Ozon
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Ozonwert
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Fluss
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Solarstrahlung
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Wasserdampf
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UV-Strahlung
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Messprogramm
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Photolyse
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Radiometrie
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Strahlungsmessung
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Temperatur
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Troposphäre
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Vertikalprofil
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Atmosphärenchemie
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Ozonabbau
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Hoehenabhaengigkeit
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Hydroxylradikal
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Konzentrationsmessung
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PAUR-Projekt
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Quantenausbeute
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Solare-aktinische-Strahlung
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Spektralradiometrie
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Spektrum
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UV-B
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Wellenlaengenabhaengigkeit
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Wellenlänge
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Region:
Nordrhein-Westfalen
Nordrhein-Westfalen
Bounding boxes:
5.8663153° .. 9.4617417° x 50.3226897° .. 52.531493499999996°
5.865998792060539° .. 9.459868448414449° x 50.32269894467417° .. 52.53157696320851°
License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0
Language: Deutsch
Organisations
Last harvest: 16.10.2026 00:38
Time ranges:
1996-02-01 - 1998-01-31
Alternatives
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Language: Englisch/English
Title: Experimental Study of the Altitude Dependence of the Tropospheric Ozone Photolysis Frequency J(O1D) Between 0 and 12 km Height
Description: The specific targets of this project are the following: 1) To measure spectra of the up- and down-welling solar actinic flux (280 nm - 450 nm) at different altitudes (0 - 12 km) in the troposphere by a spectroradiometer on board a small aircraft and to measure simultaneously ozone, water vapour and formaldehyde, 2) To measure precisely the wavelength dependence of the O(1D) quantum yield at low temperatures (220 K - 280 K) by laser methods in the laboratory, 3) To derive verttical profiles of J(O1D) from the measured solar actinic spectra and O(1D) quantum yield, and compare the experimental profiles with theoretical model results, 4) To determine quantitatively the absolute and relative HOx production rates from the photolysis of ozone and formaldehyde at different altitudes in the troposphere. The project is expected to provide solar actinic flux- and J(O1D)- data which can serve as a reference to test theoretical models and to provide a new recommendation on the temperature- and wavelength-dependence of the O(1D) quantum yield needed for tropospheric as well as stratospheric modelling purposes. A complementary project is entitled 'Photochemical activity and solar ultraviolet radiation - PAUR' (ENV4-CT95-0048). It is planned to carry out a joint field campaign in Greece in summer 1996, combining the ground-based measurements from the PAUR project with the aircraft measurements from th ATOP project.
URL: https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=47516
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