Breadcrumb
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
The effects of provenance and diagenesis on clay content and crystallinity in Miocene through Pleistocene deposits, southwestern Taiwan
Type: Journal Article
HYDROTHERMAL MN-DEPOSITS OF THE FRANCISCAN ASSEMBLAGE .2. ISOTOPE AND TRACE-ELEMENT GEOCHEMISTRY, AND IMPLICATIONS FOR HYDROTHERMAL CONVECTION AT SPREADING CENTERS
Publication Date: 1984-01-01
Type: Journal Article
GEOCHEMISTRY OF THE AMAZON .2. THE INFLUENCE OF GEOLOGY AND WEATHERING ENVIRONMENT ON THE DISSOLVED-LOAD
Publication Date: 1983-01-01
Type: Journal Article
MAJOR ION CHEMISTRY OF SOME LARGE CHINESE RIVERS
Publication Date: 1982-01-01
Type: Journal Article
PLANKTON METABOLISM AND CARBON PROCESSES IN THE AMAZON RIVER, ITS TRIBUTARIES, AND FLOODPLAIN WATERS, PERU-BRAZIL, MAY-JUNE 1977
Publication Date: 1981-01-01
Type: Journal Article
THE CHEMICAL MASS BALANCE IN THE AMAZON PLUME I - THE NUTRIENTS
Publication Date: 1981-01-01
Type: Journal Article
GEOCHEMISTRY OF THE AMAZON .1. PRECIPITATION CHEMISTRY AND THE MARINE CONTRIBUTION TO THE DISSOLVED-LOAD AT THE TIME OF PEAK DISCHARGE
Publication Date: 1981-01-01
Type: Journal Article
Metabolismo do plâncton e ciclo do carbono no rio Amazonas, seus tributários e águas de várzea, Peru-Brasil, maio-junho
Publication Date: 1980-01-01
Type: Journal Article
AMAZON CHEMISTRY - ALPHA-HELIX 1967-1977
Type: Conference Proceeding
CHEMICAL DYNAMICS OF AMAZON PLUME
Type: Conference Proceeding
CHEMICAL-ANALYSIS OF SEQUENTIAL SAMPLES FROM SINGLE RAINSTORMS
Type: Conference Proceeding
CHEMICAL DYNAMICS OF A POLLUTED WATERSHED, MERRIMACK RIVER IN NORTHERN NEW ENGLAND
Publication Date: 1976-01-01
Type: Journal Article
RADIUM AND BARIUM AT GEOSECS STATIONS IN ATLANTIC AND PACIFIC
Publication Date: 1976-01-01
Type: Journal Article
SURFACE OZONE IN SOUTH EAST ATLANTIC BETWEEN DAKAR AND WALVIS BAY
Publication Date: 1975-01-01
Type: Journal Article
CHEMICAL MASS-BALANCE IN ESTUARIES
Publication Date: 1974-01-01
Type: Journal Article
Pages
Outreach
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