A5067115370- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Hydrology and Watershed Management Studies
- Atmospheric and Environmental Gas Dynamics
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Flood Risk Assessment and Management
- Soil erosion and sediment transport
- Groundwater and Isotope Geochemistry
- Cryospheric studies and observations
- Fish biology, ecology, and behavior
- Aquatic Ecosystems and Biodiversity
- Hydrology and Sediment Transport Processes
- Coastal wetland ecosystem dynamics
- Water Quality and Pollution Assessment
- Groundwater and Watershed Analysis
- Peatlands and Wetlands Ecology
- Geography and Environmental Studies
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Water Quality and Resources Studies
- Remote Sensing in Agriculture
- Climate variability and models
- Remote Sensing and LiDAR Applications
- Climate change and permafrost
University of California, Santa Barbara
2016-2025
University of California System
1998-2021
University of Oxford
2021
City University of New York
2019
University of California, Los Angeles
1992-2019
Southern California University for Professional Studies
2018-2019
University of Southern California
2018-2019
Université de Montréal
2019
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2019
University of Victoria
2019
We explore the role of lakes in carbon cycling and global climate, examine mechanisms influencing pools transformations lakes, discuss how metabolism inland waters is likely to change response climate. Furthermore, we project changes as climate abundance spatial distribution biosphere, revise estimate for extent transformation waters. This synthesis demonstrates that annual emissions dioxide from atmosphere are similar magnitude uptake by oceans burial organic water sediments exceeds...
One of the major impediments to integration lentic ecosystems into global environmental analyses has been fragmentary data on extent and size distribution lakes, ponds, impoundments. We use new sources, enhanced spatial resolution, analytical approaches provide estimates abundance surface-water bodies. A model based Pareto shows that natural lakes is twice as large previously known (304 million lakes; 4.2 km2 in area) dominated area by millions water bodies smaller than 1 km2. Similar...
Abstract In this first worldwide synthesis of in situ and satellite‐derived lake data, we find that summer surface water temperatures rose rapidly (global mean = 0.34°C decade −1 ) between 1985 2009. Our analyses show warming rates are dependent on combinations climate local characteristics, rather than just location, leading to the counterintuitive result regional consistency is exception, rule. The most lakes widely geographically distributed, their associated with interactions among...
Floodplain inundation and vegetation along the Negro Amazon rivers near Manaus, Brazil were accurately delineated using multi-frequency, polarimetric synthetic aperture radar (SAR) data from April October 1994 SIR-C missions. A decision-tree model was used to formulate rules for a supervised classification into five categories: water, clearing (pasture), aquatic macrophyte (floating meadow), nonflooded forest, flooded forest. Classified images produced tested within three days of...
Total transport of organic carbon to the world's oceans in dissolved and particulate form rivers is estimated as 0.37 × 10 15 gC yr -1 by an inventory extrapolation data on loss per unit volume river discharge from twelve intermediate large rivers. An alternative estimate 0.41 derived measurements fluvial area land various ecosystem types. Rates range 1 m -2 grassland systems some forests. Organic a small flux global cycle, but our present understanding limited inadequate sampling few major...
Tropical reservoirs upstream from hydroelectric dams are known to release significant amounts of methane the atmosphere. Here we demonstrate that emissions downstream can also be large. Emissions CH 4 Balbina reservoir in central Amazon basin (Brazil) were calculated regular measurements degassing outflow turbines and diffusive losses. Annual surface dam 34 39 Gg C, respectively. The emission alone represented equivalent 3% all released floodplain.
Increased energy demand has led to plans for building many new dams in the western Amazon, mostly Andean region. Historical data and mechanistic scenarios are used examine potential impacts above below six of largest planned region, including reductions downstream sediment nutrient supplies, changes flood pulse, upstream fish yields, reservoir siltation, greenhouse gas emissions mercury contamination. Together, these predicted reduce supply sediments, phosphorus nitrogen from region by 69,...
Hundreds of dams have been proposed throughout the Amazon basin, one world's largest untapped hydropower frontiers. While is a potentially clean source renewable energy, some projects produce high greenhouse gas (GHG) emissions per unit electricity generated (carbon intensity). Here we show how carbon intensities upland (median = 39 kg CO2eq MWh-1, 100-year horizon) are often comparable with solar and wind whereas lowland 133 MWh-1) may exceed fossil-fuel power plants. Based on 158 existing...