The hydrography of Elkhorn Slough: a shallow California coastal Eebayment: Annual Report, Part 2, 1973

Smith, Richard E. (1973) The hydrography of Elkhorn Slough: a shallow California coastal Eebayment: Annual Report, Part 2, 1973. Moss Landing, CA, Moss Landing Marine Laboratories, (Moss Landing Marine Laboratories Technical Publication, 73-2)

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Abstract

From October 1970 through February 1972, temperature, salinity, dissolved oxygen, secchi depth and five major nutrients were observed at approximately monthly intervals in Elkhorn Slough and Moss Landing Harbor. In addition, similar hourly observations were made during two tidal studies during the wet and dry seasons. From the salinity measurements during the summer, a salt balance for Elkhorn Slough is formulated and rnean eddy diffusion coefficients are determined. The diffusion nlodel applied to longitudinal phosphate distributions yielded a mean diffusive flux of 12 kg P04/day (140 pg-at/m^2/day) for the area above the mean tidal prism. Consistent differences, apparently due to differing regenerati on ra tes, were observed in the phosphate and nitrogen distributions. Bottom sediments are proposed as a possible source for phosphate and as a sink for fixed nitrogen. Dairy farms located along central Elkhorn Slough are apparently a source for reduced nitrogen. During summer, nitrogen was found to be the limiting nutrient for primary production in the upper slough. Tidal observations indicated fresh water of high nutrient concentration consistently entered the harbor from fresh water sources to the south. This source water had a probable phosphate concentration of 40 to 60 ug-at/l and seasonally varying P:N ratio of 1:16 and 1:5 during the winter and summer respectively. Net production and respiration rates are calculated from diurnal variations in dissolved oxygen levels observed in upper Elkhorn Slough. Changes in phosphate associated with the variations in oxygen was close to the accepted ratio of 1:276 by atoms. Document is 88 pages.

Item Type: Monograph or Serial Issue
Title: The hydrography of Elkhorn Slough: a shallow California coastal Eebayment: Annual Report, Part 2, 1973
Personal Creator/Author:
CreatorsEmail
Smith, Richard E.
Series Name: Moss Landing Marine Laboratories Technical Publication
Number: 73-2
Date: 1973
Publisher: Moss Landing Marine Laboratories
Place of Publication: Moss Landing, CA
Latitude: 36.806
Longitude: -121.79
Funders: Office of Sea Grant Programs, National Oceanic and Atmospheric Administration, Department of Commerce
Issuing Agency: Moss Landing Marine Laboratories
Uncontrolled Keywords: Elkhorn Slough; California; pollution
Subjects: Oceanography
Item ID: 1306
Depositing User: Joan Parker
Date Deposited: 15 Jul 2008 13:05
Last Modified: 29 Sep 2011 20:49
URI: http://aquaticcommons.org/id/eprint/1306

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