摘要:

Many techniques have been developed to extract a model from data. In general, these techniques are based on minimization of the misfit between measured data and predicted “data.” The model is connected to the predicted “data” by a physical theory. To know how good the model is, one must evaluate model variance. Since the data variance, or alternatively the misfit, is generally nonzero, model variance is generally nonzero. In many cases, the model is a linear function of the data, and model variance can be estimated by formally mapping the data variance to model space [e.g.,Menke

ISSN:0002-8606    

DOI:10.1029/89EO00156

年代:1989

数据来源: WILEY

摘要:

The Surface Water committee has been one of the most active committees of the Hydrology Section owing in part to its broad chagrge. Previous committee chairmen Keith Hipel (1982–1984) and Jery Stedinger (1984–1988) have enthusiastically promoted the committee with the result that the number of special sessions sponsored has averaged 2–4 per AGU meeting. These sessions have covered topics clearly falling within the charge implied by the committee's title, such as water quality monitoring design, hydrologic instrumentation, and computer graphics.The wide range of special sessions organized by the committee is attributable in part to the committee's broad charge but also to the high level of activity the committee has enjoyed, and the relative inactivity of some other Hydrology Section committees. At present, almost all of the committees are active, and some change in direction for the Surface Water Committee appears in order. I believe that this change in direction should be subtle, but should emphasize increased cosponsorship of special sessions with other Hydrology Section committees, and other AGU Sec

ISSN:0002-8606    

DOI:10.1029/89EO00158

年代:1989

数据来源: WILEY

摘要:

Diversity describes the reaction to the very current issue of global warming, although most scientists and policymakers agree that there is a real threat to the world. Their message is an urgent, “We have to act now,” not 10 years from now when we are more certain that changes in climate result from human activity.The National Academy of Sciences, Smithsonian Institution, American Association for the Advancement of Science, and Sigma Xi held the 2‐day Forum on Global Change and Our Common Future, May 2 and 3 in Washington, D.C. It was a public meeting, with the aim of presenting the science of global change, its impact on society, and implications for public p

ISSN:0002-8606    

DOI:10.1029/89EO00162

年代:1989

数据来源: WILEY

摘要:

The nominees listed below are those of the Union and section nominating committees and have been approved by the AGU Council.Nominations may also be made by petition. There are no age, nationality, residence or other analogous restrictions on who may serve. As prescribed in the bylaws, each petition must be signed by at least 1% of the members of the Union or Section, as the case may be. Petitions should be sent to the General Secretary, AGU, 2000 Florida Avenue N.W., Washington, DC 20009. They must be received no later than July 7, 1989.

ISSN:0002-8606    

DOI:10.1029/89EO00165

年代:1989

数据来源: WILEY

摘要:

The second Keck Research Symposium in Geology was held April 13–16 at Colorado College, Colorado Springs. Forty faculty and 65 students from 10 institutions attended to report on Keck‐funded intercollegiate research programs of previous summers. Five research projects have been completed, in Bermuda, Colorado, Massachusetts, Montana, and Minnesota. Results were presented at the meet

ISSN:0002-8606    

DOI:10.1029/89EO00166

年代:1989

数据来源: WILEY