However, in the stratosphere, CCl4 photochemical reactions contribute to stratospheric ozone depletion and therefore CCl4 was marked as a compound to phase out of industrial processes by the 1987 Montreal Protocol (1). With an estimated lifetime of 34 years, CCl4 is considered chemically inert in the troposphere. We find that ambient air mixing ratios within and above the forest, while agreeing with current equatorial estimates (120 ppt), show diurnal and canopy-height variations that suggest a biogenic source of CCl4, and therefore may be important for closing the gaps in the global atmospheric CCl4 budget.Ĭlimate Impacts of Atmospheric CCl4: In the troposphere, carbon tetrachloride (CCl4) is a greenhouse gas with a global warming potential 1400 times greater than CO2. This article describes grab-sampling with analysis by thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) to assess levels of CCl4 in a Central Amazonian rainforest. However, some evidence suggests that biogenic sources may also contribute. Global atmospheric models treat anthropogenic industrial processes as the sole source of atmospheric CCl4. A demo version is available and can be installed without the need to uninstall Igor Pro 6.Angela Jardine 1, David Barden 2, and Kolby Jardine 3, 1Climate and Environment Department, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil, 2Markes International, Gwaun Elai Medi-Science Campus, Llantrisant, Wales, UK, 3Earth and Environmental Sciences Area, Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.Ĭarbon tetrachloride (CCl4) is a potent greenhouse gas in the troposphere, while in the stratosphere it contributes to ozone destruction. Igor Pro 7 requires Mac OS X 10.9 or later, or Windows 7 or later and is available for purchase at the WaveMetrics online store.
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