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 status of the Panama Canal watershed and its biodiversity at the beginning of the 21st century
Condit R; Robinson WD; Ibáñez R; Aguilar S; Sanjur A; Martínez R; Stallard RF; García T; Angehr GR; Petit L...
- Condit R
- Robinson WD
- Ibáñez R
- Aguilar S
- Sanjur A
- Martínez R
- Stallard RF
- García T
- Angehr GR
- Petit L
Publication Date: 2001-05-01
Type: Journal Article
RESIS-II: Making the Reservoir Survey Information System complete and user friendly
Type: Conference Proceeding
Tectonic Processes and Erosion
Publication Date: 2000-01-01
Type: Chapter
Luquillo Mountains, Puerto Rico: A Water, Energy, and Biogeochemical Budgets Program Site
Type: Journal Article
Hidrología y Suelos
Type: Chapter
Determination of predevelopment denudation rates of an agricultural watershed (Cayaguas River, Puerto Rico) using in-situ-produced 10Be in river-borne quartz
Publication Date: 1998-08-01
Type: Journal Article
Terrestrial sedimentation and the carbon cycle: Coupling weathering and erosion to carbon burial
Publication Date: 1998-06-01
Type: Journal Article
The history of a continent from U-Pb ages of zircons from Orinoco River sand and Sm-Nd isotopes in Orinoco basin river sediments
Publication Date: 1997-06-25
Type: Journal Article
Can the global carbon budget be balanced?
Type: Journal Article
Tectonic, environmental, and human aspects of weathering and erosion: A global review from a steady-state perspective (vol 23, pg 35, 1995)
Publication Date: 1996-01-01
Type: Journal Article
THE FLUVIAL GEOCHEMISTRY AND DENUDATION RATE OF THE GUAYANA SHIELD IN VENEZUELA, COLOMBIA, AND BRAZIL
Publication Date: 1995-08-01
Type: Journal Article
Chemical weathering in the South Cascade Glacier basin, comparison of subglacial and extra-glacial weathering
Publication Date: 1995-07-01
Type: Conference Proceeding
Relating chemical and physical erosion
Publication Date: 1995-01-01
Type: Journal Article
Tectonic, Environmental, and Human Aspects of Weathering and Erosion: A Global Review from a Steady-State Perspective
Publication Date: 1995-01-01
Type: Journal Article
DENUDATION RATES DETERMINED FROM THE ACCUMULATION OF IN SITU-PRODUCED BE-10 IN THE LUQUILLO EXPERIMENTAL FOREST, PUERTO-RICO
Publication Date: 1995-01-01
Type: Journal Article
TECTONIC, ENVIRONMENTAL, AND HUMAN ASPECTS OF WEATHERING AND EROSION - A GLOBAL REVIEW USING A STEADY-STATE PERSPECTIVE
Publication Date: 1995-01-01
Type: Journal Article
METHANE EMISSION BY BUBBLING FROM GATUN LAKE, PANAMA
Publication Date: 1994-04-20
Type: Journal Article
NUMERICAL-STUDIES OF BOTTOM SHEAR-STRESS AND SEDIMENT DISTRIBUTION ON THE AMAZON CONTINENTAL-SHELF
Publication Date: 1993-11-01
Type: Journal Article
NUMERICAL-STUDIES OF BOTTOM SHEAR-STRESS AND SEDIMENT DISTRIBUTION ON THE AMAZON CONTINENTAL-SHELF
Publication Date: 1993-07-01
Type: Journal Article
NUTRIENT CHEMISTRY OF THE WATER COLUMN OF LAKE TANGANYIKA
Publication Date: 1993-06-01
Type: Journal Article
DYNAMICS OF SOIL CARBON DURING DEGLACIATION OF THE LAURENTIDE ICE-SHEET
Publication Date: 1992-12-18
Type: Journal Article
EXPERIMENTAL-EVIDENCE ON THE BEHAVIOR OF METAL-BEARING COLLOIDS IN LOW-SALINITY ESTUARINE WATER
Publication Date: 1992-11-10
Type: Journal Article
6 Tectonic Processes, Continental Freeboard, and the Rate-controlling Step for Continental Denudation
Publication Date: 1992-01-01
Type: Chapter
TRACE-METALS AND DISSOLVED ORGANIC-CARBON IN ESTUARIES AND OFFSHORE WATERS OF NEW-JERSEY, USA
Publication Date: 1991-12-01
Type: Journal Article
CONTROLS ON THE COMPOSITION OF FLUVIAL SANDS FROM A TROPICAL WEATHERING ENVIRONMENT - SANDS OF THE ORINOCO RIVER DRAINAGE-BASIN, VENEZUELA AND COLOMBIA
Publication Date: 1991-12-01
Type: Journal Article
Pages
Outreach
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