2000 yr record of Sacramento-San Joaquin river inflow to San Francisco Bay estuary, California

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Geology

DOI:https://doi.org/10.1130/0091-7613(1996)024<0331:AYROSS>2.3.CO;2· OSTI ID:420919

Ingram, B L ^[1]; Ingle, J C ^[2]; Conrad, M E ^[3]

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1. Univ. of California, Berkeley, CA (United States)
2. Stanford Univ., CA (United States)
3. Lawrence Berkeley Lab., CA (United States)

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% 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{sup 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. 27 refs., 7 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 420919
• 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

40 CHEMISTRY
58 GEOSCIENCES
AGE ESTIMATION
CARBON 13
FOSSILS
HYDROLOGY
ISOTOPE DATING
OXYGEN 18
PALEOCLIMATOLOGY
SALINITY
SAN FRANCISCO BAY
SEDIMENTS