Volume 8, Number 1, Summer 2001
Cover: Geochemist David Hilton
Photograph by Marc Tule

Volcano Voyagers
Earth Scientists Examine Chemical Cycling in Central America
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By Joe Hlebica
Follow Scripps geochemist David Hilton and his research team as they sample volcanic gases known as volatiles from several active volcanoes along the Central American Arc. By determining whether there is a balance between the input and output of volatiles at subduction zones of volcanoes, they hope to have a better understanding of global chemical cycling and of the origin and evolution of Earth’s atmosphere and oceans.

Undersea Census
Fish-Sampling Device Will Help Explain Fish Ecology
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By Robert Monroe
As part of the California Cooperative Oceanic Fisheries Investigations (CalCOFI), Scripps biological oceanographer David Checkely uses an automated egg-counting device to monitor sardine populations. Despite more than 50 years of CalCOFI measurements of the California Current System, Checkley hopes to fill in significant gaps in current knowledge of sardine and anchovy behavior.

Roger Revelle and the Great Age of Exploration
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Scripps Institution of Oceanography 1948 to 1958
By Joe Hlebica
This feature is the fifth in a continuing series celebrating the100-year history of Scripps. This article covers the extensive post–World War II growth at Scripps. It was a romantic, adventurous time and it was when Scripps Director Roger Revelle took the “institution to sea.” Numerous expeditions occurred in the mid-1950s, including Northern Holiday, Shellback, and Norpax, in which important discoveries were made and data collected. It was also during this time that Revelle recruited atmospheric chemist Charles David Keeling to monitor carbon dioxide. Global warming researcher had begun.