Environmental factors associated with long-term changes in chlorophyll concentration in the Sacramento-San Joaquin delta and Suisun Bay, California
- California Dept. of Water Resources, Sacramento (United States)
Long-term changes in chlorophyll concentration were predicted from environmental variables using Box-Jenkins transfer function models for the Sacramento and San Joaquin rivers and Suisun Bay. The indication that oceanic phytoplankton biomass for the California regions is associated with climatic phenomena produced by El Nino and the Southern Oscillation (ENSO) was one of several factors used to standardize the dataset. Data used for the analyses were collected continuously on a semimonthly or monthly basis over the 17-yr period between 1971 and 1987. Groups of highly correlated environmental variables were summarized along three environmental axes using principal component analysis. The first environmental axis summarized river flow and specific conductance. The second environmental axis summarized water transparency and the third environmental axis summarized air and water temperature. Chlorophyll concentration was significantly cross-correlated with environmental axes and individual environmental variables. Transfer function models developed to describe changes in chlorophyll concentration over time were characterized by lag responses and described between 41% and 51% of the data variation. Significant cross-correlations between environmental axes and the California climate index (CA SLP) were used to develop a conceptual model of the link between regional climate and estuarine production. 50 refs., 5 figs.
- OSTI ID:
- 6620007
- Journal Information:
- Estuaries; (United States), Vol. 15:3; ISSN 0160-8347
- Country of Publication:
- United States
- Language:
- English
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COASTAL WATERS
PHYTOPLANKTON
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ENVIRONMENTAL EFFECTS
WATER
BAYS
BIOMASS
CALIFORNIA
PRODUCTION
RIVERS
SOUTHERN OSCILLATION
VARIATIONS
AQUATIC ORGANISMS
CARBOXYLIC ACIDS
DEVELOPED COUNTRIES
ENERGY SOURCES
FLUIDS
GASES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
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ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANKTON
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PORPHYRINS
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RENEWABLE ENERGY SOURCES
STREAMS
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USA
550200* - Biochemistry