By M. A. K. Khalil (auth.), M. A. K. Khalil (eds.)
Methane performs many vital roles within the earth's surroundings. it's a powerful "greenhouse fuel" that warms the earth; controls the oxidizing capability of the ambience (OH) in some way affecting the cycles and abundances of many atmospheric hint gases; presents water vapor to the stratosphere; scavenges chlorine atoms from the stratosphere, terminating the catalytic ozone destruction by way of chlorine atoms, together with the chlorine published from the man-made chlorofluorocarbons; produces ozone, CO, and CO2 within the troposphere; and it truly is an index of lifestyles in the world and so is found in larger amounts in the course of hot interglacial epochs and dwindles to low degrees throughout the chilly of ice a while. by way of all measures, methane is the second one purely to CO2 in inflicting destiny worldwide warming. The publication provides a accomplished account of the present figuring out of atmospheric methane, and it truly is an finish element for summarizing greater than a decade of in depth examine at the worldwide assets, sinks, concentrations, and environmental function of methane.
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Additional info for Atmospheric Methane: Sources, Sinks, and Role in Global Change
4. 1. The ice record of CH4 . , 1988) show that during the past glacial-interglacial climatic transition atmospheric concentrations of CH 4 nearly doubled, from 350 to 650 ppbv. , 1990). Figure 4 shows strong variations of past atmospheric concentrations in the 350-650 ppbv range, well below the present mean atmospheric concentration of roughly 1700 ppbv. 78) between the Vostok climate and CH4 records. Nevertheless, the phase relationship with climate (at least as shown in measurements of the isotopic composition of the ice; see Figure 4) is, on the whole, closer than for CO 2.
2. How can we study the contribution of a region (geographical or political) to the global methane budget? 3. How can we reconcile the differences in scales from chamber techniques to global inventories? 4. How can we study the environmental controls of methane flux on an ecosystem and landscape level? 5. How can we study methane fluxes on a process-oriented level? 1. Trends of methane in the background air, measured by GC/FID methods, are well characterized. Further work is necessary to identify trends for continental sites and vertical distribution of methane.
L. W. F. A Woerner. 1990. Airborne flux measurements and budget estimates of trace species over the Amazon Basin during the GTE/ABLE 2B expedition. 1. Geophys. , 95:16,875-16,886. A, C. Watson, J. Barrick, G. Sachse, J. Collins, G. Gregory, B. Anderson, M. Woerner. 1991. Airborne boundary-layer measurements of heat, moisture, CH4, CO, and 0 3 fluxes over Canadian boreal forest and northern wetland regions. EOS, 72:85. W. W. L. E. F. E. Collins. 1992. Airborne flux measurements of trace species in an arctic boundary layer.