A 2000 yr record of Sacramento San Joaquin River inflow to San Francisco Bay estuary, California

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Geology

OSTI ID:824294

Ingram, B L ^[1]; Ingle, J C; Conrad, M E

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1. LBNL Library

Oxygen and carbon isotopic measurements of fossil bivalves (Macoma nasuta) contained in estuarine sediment are used to reconstruct a late Holocene record of salinity and stream flow in San Francisco Bay. Discharge into the bay is a particularly good indicator of paleoclimate in California because the bay's influent streams drain 40 percent of the state, The isotopic record suggests that between about 1670 and 1900 calendar years (yr cal) B.P. inflow to the bay was substantially greater than the estimated prediversion inflow of 1100 m(3)/s, An unconformity representing a 900 yr hiatus is present in the core between 1670 and 750 yr cal B.P., possibly caused by a major hydrological event. Over the past 750 yr, stream flow to San Francisco Bay has varied with a period of 200 yr; alternate wet and dry (drought) intervals typically have lasted 40 to 160 yr.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 824294
• Report Number(s): LBNL--55135
• Journal Information: Geology, Journal Name: Geology Journal Issue: 4 Vol. 24; ISSN 0091-7613; ISSN GLGYBA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CARBON ISOTOPES
ESTUARIES
FLUID FLOW
FOSSILS
GEOLOGIC HISTORY
HYDROLOGY
OXYGEN ISOTOPES
PALEOCLIMATOLOGY
RIVERS
SALINITY
SAN FRANCISCO BAY
SEDIMENTS