Frode Stordal

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New estimates of the various contributions to the radiative forcing (RF) from aviation are presented, mainly based on results from the TRADEOFF project that update those of the Intergovernmental Panel on Climate Change (IPCC, 1999). The new estimate of the total RF from aviation for 2000 is approximately the same as that of the IPCC’s estimate for 1992.(More)
Is there a trend in cirrus cloud cover due to aircraft traffic? F. Stordal , G. Myhre , W. Arlander , T. Svendby, E. J. G. Stordal, W. B. Rossow, and D. S. Lee Norwegian Institute for Air Research, Kjeller, Norway Department of Geosciences, University of Oslo, Norway NASA/Goddard Institute for Space Studies, New York, New York, USA Department of Environment(More)
A new version of the RegCM regional climate modeling system, RegCM4, has been recently developed and made available for public use. Compared to previous versions, RegCM4 includes new land surface, planetary boundary layer, and air–sea flux schemes, a mixed convection and tropical band configuration, modifications to the pre-existing radiative transfer and(More)
The response of clouds to sudden decreases in the flux of galactic cosmic rays (GCR) – Forbush decrease events – has been investigated using cloud products from the space-borne MODIS instrument, which has been in operation since 2000. By focusing on pristine Southern Hemisphere ocean regions we examine areas where we believe that a cosmic ray signal should(More)
For an 8-month period aerosol optical depth (AOD) is compared, derived over global oceans with five different retrieval algorithms applied to four satellite instruments flown on board three satellite platforms. The Advanced Very High Resolution Radiometer (AVHRR) was flown on board NOAA-14, the Ocean Color and Temperature Scanner (OCTS) and the Polarization(More)
G. Myhre , F. Stordal , M. Johnsrud, D. J. Diner, I. V. Geogdzhayev, J. M. Haywood, B. Holben, T. Holzer-Popp, A. Ignatov, R. Kahn, Y. J. Kaufman, N. Loeb, J. Martonchik, M. I. Mishchenko, N. R. Nalli, L. A. Remer, M. Schroedter-Homscheidt, D. Tanré, O. Torres, and M. Wang Norwegian Institute for Air Research (NILU), Kjeller, Norway Department of(More)
We have used the MODIS satellite data and two global aerosol models to investigate the relationships between aerosol optical depth (AOD) and cloud parameters that may be affected by the aerosol concentration. The relationships that are studied are mainly between AOD, on the one hand, and cloud cover, cloud liquid water path, and water vapour, on the other.(More)
The indirect effect of aerosols via liquid clouds is investigated by comparing aerosol and cloud characteristics from the Global Climate Model CAM-Oslo to those observed by the MODIS instrument onboard the TERRA and AQUA satellites (http://modis.gsfc.nasa.gov). The comparison is carried out for 15 selected regions ranging from remote and clean to densely(More)
Results from the Intergovernmental Panel on Climatic Change (IPCC) tropospheric photochemical model intercomparison (PhotoComp) are presented with a brief discussion of the factors that may contribute o differences inthe modeled behaviors ofHO x cycling and the accompanying 03 tendencies. PhotoComp was a tightly controlled model experiment inwhich the IPCC(More)