Blar i CICERO Reports på forfatter "Isaksen, Ivar S. A."

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    • A review of country studies on climate change 

      Hanisch, Ted; Fuglestvedt, Jan S.; Isaksen, Ivar S. A.; Selrod, Rolf; Strand, Jon; Torvanger, Asbjørn (CICERO Report;1993:01, Research report, 1993)
      Country studies are important instruments for determining national climate policies and adding to the global knowledge on climate issues. They are, however, also the basis for examining the obligations of the Parties under ...

    • Climatic effects of NOx emissions through changes in tropospheric O3 and CH4: A global 3D model study 

      Fuglestvedt, Jan S.; Berntsen, Terje Koren; Isaksen, Ivar S. A.; Mao, Huiting; Liang, Xin-Zhong; Wang, Wei-Chyung (CICERO Report;1997:03, Research report, 1997)
      As a result of chemical processes in the atmosphere, emissions of NOx can both damp and enhance the greenhouse effect. The two most important effects of NOx in this context are increased concentrations of tropospheric ozone ...

    • Direct and indirect global warming potentials of source gases 

      Fuglestvedt, Jan S.; Isaksen, Ivar S. A.; Wang, Wei-Chyung (CICERO Report;1994:01, Research report, 1994)
      Global Warming Potentials for emissions of CH4, CO and NOx that take into account indirect chemical effects have been estimated for five time horizons. The indirect effects of methane emissions that have been considered ...

    • Effects of anthropogenic emissions on tropospheric ozone and its radiative forcing 

      Berntsen, Terje Koren; Isaksen, Ivar S. A.; Fuglestvedt, Jan S.; Myhre, Gunnar; Larsen, T. Alsvik; Stordal, Frode; Freckleton, R. S.; Shine, Keith P. (CICERO Report;1997:02, Research report, 1997)
      Tropospheric ozone changes since pre-industrial times due to changes in emissions have been calculated by the University of Oslo global 3-D photochemical model. The radiative forcing caused by the increase in ozone has ...

    • Effects of reductions in stratospheric ozone on tropospheric chemistry through changes in photolysis rates 

      Fuglestvedt, Jan S.; Jonson, J. E.; Isaksen, Ivar S. A. (CICERO Report;1993:05, Research report, 1993)
      The observed reductions in stratospheric ozone since the late 1970s are likely to have affected the penetration of UV radiation into the troposphere. We have examined the sensitivity and the response of the tropospheric ...

    • Environmental problems connected to emissions of ozone-depleting and climate gases 

      Isaksen, Ivar S. A. (CICERO Report;1995:09, Research report, 1995)
      -Carbon dioxide and methane emissions important for the global climate impact. -Less impact through energy efficiency (CO2) and better control of CH4-emssions. -Rapid increase in emission of pollutants. -Rapid increase ...

    • Responses in tropospheric chemistry to changes in UV fluxes, temperatures and water vapour densities 

      Fuglestvedt, Jan S.; Jonson, J. E.; Wang, Wei-Chyung; Isaksen, Ivar S. A. (CICERO Report;1994:05, Research report, 1994)
      A two-dimensional chemistry/transport model of the global troposphere is used to study the chemical response to i) increased UV-radiation from stratospheric ozone depletion and ii) increased temperatures and water vapour ...

    • Responses in tropospheric O3, OH and CH4 to changed emissions of important trace gases 

      Fuglestvedt, Jan S.; Berntsen, Terje Koren; Isaksen, Ivar S. A. (CICERO Report;1993:04, Research report, 1993)
      A two-dimensional (altitude vs. latitude) photochemical/transport model of the global troposphere is applied to study the effects of changed emissions of NOx, CH4, CO2 and NMHC on the levels of O3, OH and CH4. On a mass ...

    • Stratospheric ozone depletion: Its impact on tropospheric chemistry and on climate 

      Isaksen, Ivar S. A. (CICERO Report;1995:10, Research report, 1995)
      Observations show a long term decrease in stratospheric ozone on a global scale during the last two decades. Over the southern polar region the reductions are large and clearly connected to man made emissions of CFCs. There ...

    • The state of the ozone layer: A 1994 science update 

      Isaksen, Ivar S. A. (CICERO Report;1994:03, Research report, 1994)
      Both the ground based and satellite observation data bases have been extended since the previous international ozone assessment. There are several satellite systems in operation that provide total ozone data, which have ...