Blar i CICERO Research Archive 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 (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 ... -
An assessment of the role of CF4 and C2F6 as greenhouse gases
Isaksen, Ivar S. A.; Brühl, Christoph; Molina, Mario; Schiff, Harold; Shine, Keith P.; Stordal, Frode (1992:06, Working paper, 1992) -
Atmospheric methane evolution the last 40 years
Dalsøren, Stig Bjørløw; Myhre, Cathrine Lund; Myhre, Gunnar; Gomez-Pelaez, Angel J.; Haslerud, Amund Søvde; Isaksen, Ivar S. A.; Weiss, Ray F.; Harth, Christina M. (Peer reviewed; Journal article, 2016)Observations at surface sites show an increase in global mean surface methane (CH4) of about 180 parts per billion (ppb) (above 10 %) over the period 1984–2012. Over this period there are large fluctuations in the annual ... -
Betydningen av CF4 og C2F6 som klimagasser
Isaksen, Ivar S. A. (1991:01, Working paper, 1991) -
CICERONE 1992-1
Hanisch, Ted; Isaksen, Ivar S. A.; Fuglestvedt, Jan S. (1992:1;, Others, 1992-10-13) -
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 (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 (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. (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. (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. (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 ... -
Impacts of reduced NOx emissions on radiative forcing through changes in tropospheric O3 and CH4: A global 3-D model study
Fuglestvedt, Jan S.; Berntsen, Terje Koren; Isaksen, Ivar S. A.; Mao, Huiting; Liang, Xin-Zhong; Wang, Wei-Chyung (1997:01, Working paper, 1997)A three-dimensional global chemical tracer model and a radiation transfer model have been used to study the role of reduced NOx emissions on radiative forcing. Through production of tropospheric O3, NOx emissions lead to ... -
Internasjonal klimautredning oppdatering 1992
Isaksen, Ivar S. A. (1992:01, Working paper, 1992) -
NOx emissions from aircraft: Effects of lightning and convection on changes in tropospheric ozone
Berntsen, Terje Koren; Isaksen, Ivar S. A. (1998:05, Working paper, 1998)A global 3-dimensional chemical tracer model (CTM) has been used to study the impact on tropospheric ozone caused by NOx emissions from today’s fleet of subsonic aircraft (0.52 Tg(N)/yr), due to uncertainties in sources ... -
Oppdatering av verdier for "Global Warming Potentials (GWP)" i forbindelse med IPCC prosessen
Isaksen, Ivar S. A. (1994:02, Working paper, 1994) -
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. (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. (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. (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 climate issue: Present state of knowledge
Isaksen, Ivar S. A. (1992:04, Working paper, 1992) -
The ozone depletion problem
Isaksen, Ivar S. A. (1996:03, Working paper, 1996) -
The ozone layer problem: Recent findings
Isaksen, Ivar S. A. (1992:07, Working paper, 1992)