with the implementation of the Vaisala radiosonde. signal pattern in the greenhouse warming experi- Radiation corrections will be made to data from Vaisala ments was quite distinct from the model's own natural radiosondes, as is the common practice with other variability noise patterns. To study the sensitivity of countries using this radiosonde type. Data transmitted the results to differences in the initial conditions, four from the remaining 69 NWS VIZ upper-air sites will experiments with identical greenhouse gas forcing continue to be uncorrected. Plans are being formu- were performed; each started from different initial lated to make the necessary system changes to states of the climate system. transmit corrected data for all radiosondes within the Among the four experiments, LLNL found that the next two to four years. evolution of the surface temperature changes over The NWS will provide 60 days' advance notification space and time was quite different over the first 30-4 0 on the scheduled operational implementation dates of years. This suggests that, even for a single coupled the Vaisala radiosonde for each location. Operational model, a large number of transient greenhouse warm- phaseovers will occur at the beginning of the month ing experiments might have to be performed in order and will require several months to complete for the to obtain a reliable estimate of the true, underlying entire network. NWS will also provide the dates of greenhouse warming signal. other network changes required to phase out the Climate changes have also been induced by ob- Orbital Sciences Corporation, Space Data Division, serving changes in ocean variables. This study illus- radiosondes, and any necessary realignments of the trates that different experiments performed with the VIZ sites. Questions on data corrections and network same ocean model (but with some differences in configurations should be referred to Carl Bower, W/ terms of how the ocean model is forced by atmo- 0S014 , telephone: 301-713-0722. spheric fluxes) can yield rather different ocean vari- ability. These differences in variability translate into Gases May Be Hiding Greenhouse Fingerprint large uncertainties in detection time, even if an ocean In collaboration with the Max-Planck-Institute fur greenhouse warming signal were perfectly known. Meteorologie in Hamburg, scientists at Lawrence The most recent research has used experiments by Livermore National Laboratory (LLNL) have analyzed Karl Taylor and Joyce Penner of LLNL to address the time-dependent greenhouse warming experiments question of whether emissions of anthropogenic sul- and a long control integration performed with the fate aerosols could have obscured a greenhouse Hamburg coupled atmosphere-ocean GCM. warming signal. The results of this study are not The research indicates that surface air temperature inconsistent with the hypothesis that anthropogenic changes may be an important component of a "finger- sulfate aerosols may be masking a greenhouse gas print" for detecting greenhouse warming, since the temperature signal. • • • National Academy Professor C.-G. Rossby and Dr. Columbus O'D. Iselin 11 were honored at the 1943 annual meeting of the National Academy of Sciences. Professor Rossby was elected to membership in the Academy and Dr. Iselin was awarded the Agassiz Gold Medal and honorarium of $300 "for his studies of the gulf stream system, for his leadership in the development of a general program of the physical oceanography of the North Atlantic, and for his distinguished direction of the activities of the Woods Hole Oceanographic Institution both in peace and in war." Bull. Amer. Meteor. Soc., 25,196. 88 3 Bulletin of the American Meteorological Society
Bulletin of the American Meteorological Society – American Meteorological Society
Published: May 1, 1994
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