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Bio
Biogeochemistry, hydrology, and geomorphology
The earth-surface environment and how it changes on human and geologic time scales. My emphasis is on climate and land-use changes and how these affect processes that control the composition and dispersal of dissolved and solid phases in rivers and trace gases in the atmosphere. My work combines both field and theoretical studies using the tools of geology, biology, biogeochemistry, and geography.
Current areas of investigation: (1) Can we develop general physically and biologically based models of the processes that generate the dissolved and particulate load in rivers and trace substances in the atmosphere? (2) How do various phases chemically partition during transport in rivers and estuaries? (3) What are the dispersal pathways of river-borne substances through rivers and estuaries into the coastal environment? (4) How do human activities, particularly land-use change, affect environments being examined? (5) How do we use rivers to integrate phenomena at local spatial scales up to continental scales? (6) Can we formulate provenance models to reconstruct past geologic environments?
Education
- PhD: Massachusetts Institute of Technology - Woods Hole Oceanographic Institute, 1980
Awards
- Meritorious Service Award for "exceptional contributions to the development of new and innovative research programs in the U.S. Geological Survey," Department of the Interior, 2002
Research
Research interests: biogeochemistry, hydrology, and geomorphology.
Publications
Recent publications
Publication Date: 1990-03-01
Type: Journal Article
Publication Date: 1990-01-25
Type: Journal Article
Weathering processes and the composition of inorganic material transported through the Orinoco River system, Venezuela and Colombia
Type: Chapter
Publication Date: 1989-11-01
Type: Journal Article
PHYSIOGRAPHIC CONTROLS ON THE COMPOSITION OF SEDIMENTS DERIVED FROM VOLCANIC AND SEDIMENTARY TERRAINS ON BARRO COLORADO ISLAND, PANAMA
Publication Date: 1989-09-01
Type: Journal Article
Publication Date: 1988-08-01
Type: Journal Article
Publication Date: 1988-07-01
Type: Journal Article
Publication Date: 1988-05-01
Type: Journal Article
Type: Chapter
Publication Date: 1987-10-01
Type: Journal Article
Publication Date: 1987-07-15
Type: Journal Article
Publication Date: 1987-03-31
Type: Journal Article
Publication Date: 1986-12-01
Type: Journal Article
Publication Date: 1986-10-01
Type: Journal Article
DISLOCATION ETCH PITS IN QUARTZ
Publication Date: 1986-01-01
Type: Journal Article
Publication Date: 1985-01-01
Type: Journal Article
Type: Chapter
CHEMICAL CONTROLS ON ETCH PIT FORMATION AT DISLOCATION OUTCROPS IN QUARTZ
Publication Date: 1985-01-01
Type: Journal Article
The effects of provenance and diagenesis on clay content and crystallinity in Miocene through Pleistocene deposits, southwestern Taiwan
Type: Journal Article
Publication Date: 1984-01-01
Type: Journal Article
Publication Date: 1983-01-01
Type: Journal Article
Publication Date: 1982-01-01
Type: Journal Article
Publication Date: 1981-01-01
Type: Journal Article
Publication Date: 1981-01-01
Type: Journal Article
Publication Date: 1981-01-01
Type: Journal Article
Pages
Outreach
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