Regions L2 Landing Page Tabs
Remote sensing: visual cues to suspended-solids transport in San Francisco Bay, California
No abstract available.Ruhl, C.A.; Schoellhamer, D.H.; Stumpf, R.P.; Lindsay, C.L.
Sediment inflow to the Sacramento-San Joaquin Delta and the San Francisco Bay
No abstract available.Oltmann, R.N.
Sedimentary record of anthropogenic and biogenic polycyclic aromatic hydrocarbons in San Francisco Bay, California
Dated sediment cores collected from Richardson and San Pablo Bays in San Francisco Bay were used to reconstruct a history of polycyclic aromatic hydrocarbon (PAH) contamination. The sedimentary record of PAHs in Richardson Bay shows that anthropogenic inputs have increased since the turn of the century, presumably as a result of increasing...Pereira, W.E.; Hostettler, F.D.; Luoma, S.N.; VanGeen, A.; Fuller, C.C.; Anima, R.J.
Stable lead isotopic analyses of historic and contemporary lead contamination of San Francisco Bay estuary
Variations in stable lead isotopic composition (240Pb, 206Pb, 207Pb, 208Pb) in three sediment cores from the San Francisco Bay estuary document temporal changes in sources of lead during the past two centuries. Sediment, with lead from natural geologic sources, and relatively homogeneous lead isotopic compositions are overlain by sediments whose...Ritson, P.I.; Bouse, R.M.; Flegal, A.R.; Luoma, S.N.
The effect of infaunal bivalve grazing on phytoplankton bloom development in south San Francisco Bay
No abstract available.Thompson, J.K.
The impact of human activities on sediments of San Francisco Bay, California: an overview
This note introduces a set of eight papers devoted to a detailed study of two sediment cores from San Francisco Bay with an overview of the region and a chronology of human activities. Data used in this study to constrain the range of sediment ages at different depths include , and concentrations in the sediment and the ...van Geen, Alexander; Luoma, Samuel N.
The relative importance of light and nutrient limitation of phytoplankton growth: A simple index of coastal ecosystem sensitivity to nutrient enrichment
Anthropogenic nutrient enrichment of the coastal zone is now a well-established fact. However, there is still uncertainty about the mechanisms through which nutrient enrichment can disrupt biological communities and ecosystem processes in the coastal zone. For example, while some estuaries exhibit classic symptoms of acute eutrophication,...Cloern, J.E.
The spring runoff pulse from the Sierra Nevada
Just about every year there is one major first pulse of snowmelt runoff (streamflow) that marks the transition from winter to spring in high elevation, snowmelt driven watersheds in the western United States. As a index, we have used the record of relatively pristine streamflow at the Merced River, Happy Isles in Yosemite National Park to identify...Cayan, D.R.; Peterson, D.H.; Riddle, L.; Dettinger, M.D.; Smith, R.
Time series of suspended-solids concentration in Honker Bay during water year 1997
Suspended-solids concentration (SSC) responds differently to seasonal variations, such as Delta outflow and wind in shallow water areas than in deep-water channels. Although San Francisco Bay includes extensive areas of shallow water, with about one-half of the surface area of the Bay being less than 2 meters deep (Conomos and Peterson, 1977),...Ruhl, Catherine A.; Schoellhamer, David H.
United States streamflow probabilities based on forecasted La Nina, winter-spring 2000
Although for the last 5 months the TahitiDarwin Southern Oscillation Index (SOI) has hovered close to normal, the “equatorial” SOI has remained in the La Niña category and predictions are calling for La Niña conditions this winter. In view of these predictions of continuing La Niña and as a direct extension of...Dettinger, M.D.; Cayan, D.R.; Redmond, K.T.
Water-quality variability in San Francisco Bay: general patterns of change during 1997
The 1997 Annual Report is the fifth Annual Report from the Regional Monitoring Program for Trace Substances (RMP) and contains a comprehensive description of RMP results from the 1997 monitoring year. As in previous years, the report includes results from the Base Program (water, sediment, and bivalve monitoring) and results from Pilot and Special...Cloern, J.E.; Cole, B.E.; Edmunds, J.L.; Baylosis, J.I.
USGS conducts water quality sampling to describe changes in water quality along the deep channel of the San Francisco Bay-Delta system. Sampling includes continuious sampling and discrete sampling. Here a water discrete water sample is collected using a Niskin sampler at sunset in north San Francisco Bay.
Evaportranspiration equipment along the Tracey Segment
USGS regional research drill rig constructing sites near the south bank of the Truckee River just downstream of USGS 10350000 Truckee River at Vista. The wells were constructed to investigate surface water groundwater interaction.
Irrigation systems in Central California Valley Ecoregion: Single-field irrigation ditch.
Conversions of grassland/shrubland and agriculture to developed land were two common land-cover changes in Southern and Central California Chaparral and Oak Woodlands Ecoregion.
Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.