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000012494 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000012494 1001_ $$0P:(DE-HGF)0$$aKoepke, P.$$b0
000012494 245__ $$aNO2 photolysis frequencies in street canyons
000012494 260__ $$aKatlenburg-Lindau$$bEGU$$c2010
000012494 300__ $$a7457 - 7466
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000012494 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v10$$x1680-7316
000012494 500__ $$aFinancial support by the German Umweltbundesamt under UFOPLAN Grant 370942207 is gratefully acknowledged.
000012494 520__ $$aPhotolysis frequencies for NO2 are modeled for the conditions in urban streets, which are taken into account as canyons with variable height and width. The effect of a street canyon is presented with absolute values and as a ratio RJ of the photolysis frequency within the street compared to that with free horizon. This allows further use of the existing photolysis parameterizations. Values are presented for variable solar elevation and azimuth angles, varying atmospheric conditions and different street properties. The NO2 photolysis frequency in a street depends strongly on the relative width of the street and its orientation towards the sun. Averaged over atmospheric conditions and street orientation, the NO2 photolysis frequency is reduced in comparison with the values for free horizon: to less than 20% for narrow skyscraper streets, to about 40% for typical urban streets, and only to about 80% for garden streets. A parameterization with the global solar irradiance is given for the averaged RJ values.
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000012494 7001_ $$0P:(DE-HGF)0$$aGarhammer, M.$$b1
000012494 7001_ $$0P:(DE-HGF)0$$aHess, M.$$b2
000012494 7001_ $$0P:(DE-Juel1)16301$$aRoeth, E.-P.$$b3$$uFZJ
000012494 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acpd-10-12827-2010$$gVol. 10, p. 7457 - 7466$$p7457 - 7466$$q10<7457 - 7466$$tAtmospheric chemistry and physics$$v10$$x1680-7316$$y2010
000012494 8567_ $$uhttp://dx.doi.org/10.5194/acpd-10-12827-2010
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