caa a22 4500 475823354 CHVBK 20180406123824.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1006415919030 doi (NATIONALLICENCE)springer-10.1023/A:1006415919030 Fast-J: Accurate Simulation of In- and Below-Cloud Photolysis in Tropospheric Chemical Models [Elektronische Daten] [Oliver Wild, Xin Zhu, Michael Prather] Photolysis rates in the troposphere are greatly affected by the presenceof cloud and aerosol layers. Yet, the spatial variability of theselayers along with the difficulty of multiple-scattering calculationsfor large particles makes their inclusion in 3-D chemical transportmodels computationally very expensive.This study presents a flexible and accurate photolysis scheme, Fast-J,which calculates photolysis rates in the presence of an arbitrary mix ofcloud and aerosol layers. The algorithm is sufficiently fast to allow thescheme to be incorporated into 3-D global chemical transport models andhave photolysis rates updated hourly. It enables tropospheric chemistrysimulations to include directly the physical properties of the scatteringand absorbing particles in the column, including the full, untruncatedscattering phase function and the total, uncorrected optical depth.The Fast-J scheme is compared with earlier methods that have been usedin 3-D models to parameterize the effects of clouds on photolysis rates.The impact of Fast-J on tropospheric ozone chemistry is demonstratedwith the UCI tropospheric CTM. Kluwer Academic Publishers, 2000 photolysis rates nationallicence tropospheric chemistry nationallicence chemical transport modelling nationallicence Wild Oliver Earth System Science, University of California, 92697, Irvine, CA, U.S.A. aut Zhu Xin Earth System Science, University of California, 92697, Irvine, CA, U.S.A. aut Prather Michael Earth System Science, University of California, 92697, Irvine, CA, U.S.A. aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 37/3(2000-11-01), 245-282 0167-7764 37:3<245 2000 37 10874 https://doi.org/10.1023/A:1006415919030 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006415919030 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wild Oliver Earth System Science, University of California, 92697, Irvine, CA, U.S.A aut NATIONALLICENCE 700 1- Zhu Xin Earth System Science, University of California, 92697, Irvine, CA, U.S.A aut NATIONALLICENCE 700 1- Prather Michael Earth System Science, University of California, 92697, Irvine, CA, U.S.A aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 37/3(2000-11-01), 245-282 0167-7764 37:3<245 2000 37 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer