Other
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..455i&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 3, p. 455-467.
Other
6
Scientific paper
Salinities, δD and δ18O values of water samples collected bimonthly from two stations in San Francisco Bay estuary during 1991-1993, and along a salinity transect in March of 1992, indicate a linear mixing relation between the isotopic compositions of the waters and their salinities. The salinities and stable isotope compositions of samples from two locations in San Francisco Bay vary in response to changes in freshwater inflow. The data from these locations indicate simple mixtures of Pacific Ocean water (salinity ≈33, δ18O ≈ 0 to -1‰, δD ≈ 0 to -10‰) and Sacramento-San Joaquin River water (salinity ≈ 0, δ18O = -10 to -12‰, δD = -75 to -85‰).Preliminary water balance estimates, using isotopic differences between local and upland runoff, suggest that local runoff (including waste water) comprises less than 20% of total freshwater entering the bay.The average δ18O values of mussel shells (Mytilus edulis) collected live from eight locations in San Francisco Bay primarily reflect the δ18O of the water in which they grew. Shells subsampled along growth bands show that seasonal shifts in salinity and δ18O are recorded in the shells. Therefore, the use of stable isotope measurements should be useful in reconstructing pre-instrumental bay salinity and associated freshwater inflow (both annual average values and seasonal variations) to the San Francisco Bay, as well as potentially other estuarine systems.
Conrad Mark E.
Ingle James C.
Ingram Bonnye L.
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