Elkhorn Slough (ELK) NERR Water Quality Metadata January ? December, 2004 Last updated August 31, 2005Entry ID: CDMO_elkwq01-12.04m
Abstract: Water quality monitoring is conducted at 26 National Estuarine Research Reserves (NERR) at four locations within or adjacent to the reserve. The following parameters are collected at least every 30 minutes: water temperature, specific conductivity, salinity, percent saturation, dissolved oxygen concentration, water depth, pH and turbidity. All water quality data loggers will be deployed from a known depth from the bottom at each site.
Purpose: Research objectives Four long-term monitoring stations have been established along the estuarine gradient and in a range of runoff in order to collect quality baseline information and improve our understanding of tidal dynamics and watershed inputs. South Marsh (SM) is in a relatively unimpacted side channel of the slough, Azevedo Pond (AP) is in a pond that receives fertilizer and pesticide ... runoff from an adjoining strawberry field. The third site, North Marsh (NM), was added in April 1999 and is located in an area where there is both agricultural and non-agricultural runoff. The fourth site, Vierra Mouth, is located at the mouth of the slough and is used to identify oceanic influence. This site was added March 14, 2001. The purpose of this research is to identify the base parameters for Elkhorn Slough by using South Marsh as the control site while monitoring the two impacted sites (Azevedo Pond and North Marsh) for possible future problems. An additional objective is to tract water quality changes associated with land management changes.
Associated researchers and projects There are many projects associated with Elkhorn Slough that are related to water quality, please contact the reserve for a complete list of associated researchers and projects. There are currently two main projects that enhance data collected by our data loggers. One is the Land/Ocean Biogeochemical Observatory in Elkhorn Slough (LOBO) project, which is being conducted by Ken Johnson and others associated with the Monterey Bay Aquarium Research Institute (MBARI). The aim of the LOBO project is to design and develop a real time aquatic sensor network that can measure chemical and physical parameters using in situ sensors to determine the biogeochemical fluxes into, within, and out of Elkhorn Slough. The primary focus is to measure nutrients, such as nitrate, ammonium, and phosphate, using instruments that allow for high-resolution sampling and the ability to access the data in near-real time. The second is in conjunction with the Elkhorn Slough Foundation, which has been monitoring estuarine water quality in the central Monterey Bay region since 1988. Currently, 24 stations are monitored monthly for temperature, salinity, dissolved oxygen, pH, turbidity, nitrate, ammonium and dissolved inorganic phosphate concentrations. Data from this long-term monthly program and from the NERR program mutually enhance temporal and spatial understanding of water quality in the Slough. Other remarks/notes In December 2003, a levee protecting the North Marsh site broke and the site was inundated with extreme high tide water. Following this event the area was managed to determine optimal water depth and was slowly returned to equilibrium. Construction at the site to prevent future flooding events required the removal of the sonde from the North Marsh site from October 21 08:30 through November 30 12:00. At Vierra Mouth from July 19 10:00 through September 13 9:00 and from October 11 11:00 through November 8 12:00, depth data was incongruent with previous and subsequent data due to improper placement of the sonde within the deployment tube. The probe did not malfunction, but the data needed to be calibrated to allow for the difference in depth. Between July 19 10:00 and September 13 9:00 a calibration constant of 1.39 was added to all values. Between October 11 11:00 and November 8 12:00 a calibration constant of 1.31 was added to all values. South Marsh deployment for December 13 was pulled early due to bad readings from telemetry data. Sonde replaced and new deployment started.
SPATIAL DATA ORGANIZATION INFORMATION:
Indirect Spatial Reference: Site location and character Elkhorn Slough is located on the West Coast of the United States in Central California. It connects with the Pacific Ocean in central Monterey Bay near Moss Landing, California and harbors the largest tract of tidal salt marsh in California outside of San Francisco Bay. Home to a rich diversity of organisms, the slough is a breeding area for many of Monterey Bay's marine inhabitants and an important migratory bird location. As with many estuaries in the United States, Elkhorn Slough and the watershed are host to numerous human activities, including agricultural use, an active fishing harbor, and a power plant at the harbor entrance. There are four NERR water quality sampling sites all of which are exposed to precipitation runoff during our wet season (October through May). AP (Azevedo Pond, 36(50?44.64?N, 121(45?13.24?W) is in a pond that receives fertilizer and pesticide runoff from a strawberry field implementing best management practices in year-round production. The depth of this site is approximately 0.25 meters at mean low water. The YSI is located about 10m from a culvert connecting the pond to the slough. Tide ranges from 0 to 1.5 meters and salinity ranges from 2.1 ppt during heavy runoff to 40.5 ppt during strong evaporation. The sonde is located approximately 20 cm off the bottom, which is composed of silty mud. NM (North Marsh, 36(50?04.75?N, 121(44?18. 33?W) is located in between South Marsh and Azevedo Pond in an area of muted tidal influence from tide gates and ?diked? by the Rail Road which separates this marsh from the main channel of the Slough. The depth is approximately 0.3 meters at mean low water. This site is impacted by both agricultural and urban runoff. The tide ranges from approximately 0.2 to 0.75 meters. Salinity ranges between 17.8 and 42.5 parts per thousand and is affected by freshwater runoff from agriculture and upland runoff. The sonde is approximately 30 cm off the bottom, which is composed of silty mud. SM (South Marsh, 36(49?05.00?N, 121(44?21.83?W) is located approximately 3 km south of NM and is surrounded by mostly reserve land. This site is located in a marsh that is also ?diked? from the Rail Road but does not have a tide gate and is exposed to the full tidal range. The depth is approximately 0.5 meters at mean low water. This site receives runoff mostly from uplands with some coming from cattle ranches only during the rainy season (October through May). This site receives the least amount of pollution. The tidal range is from 0 to 2.9 meters and the salinity range is from 20.8 to 34.6 parts per thousand. The sonde is approximately 30 cm off the bottom, which is composed of slightly compacted silty mud. The fourth site, VM (Vierra Mouth, 36(48?39.95?N, 121(44?45.40?W), is located at the mouth of the slough and is used to identify oceanic influence. The tidal range is from 1.0 to 4.0 meters and salinity ranges from 24.5 to 34.3 parts per thousand. The sonde is located approximately 30 cm off the bottom, which is composed of compacted mud and sand due to strong tidal currents at a depth of approximately 1.5 meters at mean low water. This site receives drainage from the entire watershed since it is at the mouth of the slough. There are several auto wreaking yards located approximately 2 km east of this site and the Moss Landing Power Plant approximately 1 km to the south. Effluent from the power plant discharges approximately 200 meters off the beach outside of the influence of this site. Though freshwater inputs have not been quantified, the four stations receive runoff from rain, particularly between the months of October and May when rainfall is heaviest, and from irrigated farmlands year round.
Data Set Citation
Dataset Originator/Creator: Kerstin Wasson
Dataset Title: Elkhorn Slough (ELK) NERR Water Quality Metadata January ? December, 2004 Last updated August 31, 2005
Dataset Release Date: 2006-02-09
Data Presentation Form: Unknown
Other Citation Details: NAOnline Resource: http://cdmo.baruch.sc.edu/
This description is a member of a collection. The collection is described in
Start Date: 2004-01-01Stop Date: 2004-12-31
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > PHOSPHOROUS COMPOUNDS
OCEANS > COASTAL PROCESSES > ESTUARIES
OCEANS > OCEAN CHEMISTRY > NITRATE
OCEANS > OCEAN CHEMISTRY > NITRITE
OCEANS > OCEAN CHEMISTRY > PHOSPHATE
BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY
OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL
Quality See http://cdmo.baruch.sc.edu/data/qaqc.cfm
Access Constraints Data collected in conjunction with the National Estuarine Research Reserve System's (NERRS) System-wide Monitoring Program (SWMP) is considered public information. Please see site for further information: http://cdmo.baruch.sc.edu/aboutdata.htm
Distribution NOAA/ERD retains the right analyze, synthesize and publish summaries of the ... NERRS System-wide Monitoring Program data. The PI retains the right to be fully credited for having collected and processed the data. Following academic courtesy standards, the PI and NERR site where the data were collected will be contacted and fully acknowledged in any subsequent publications in which any part of the data are used. Manuscripts resulting from this NOAA/ OCRM supported research that are produced for publication in open literature, including refereed scientific journals, will acknowledge that the research was conducted under an award from the Estuarine Reserves Division, Office of Ocean and Coastal Resource Management, National Ocean Service, National Oceanic and Atmospheric Administration. The data set enclosed within this package/ transmission is only as good as the quality assurance and quality control procedures outlined by the enclosed metadata reporting statement. The user bears all responsibility for its subsequent use/ misuse in any further analyses or comparisons. The Federal government does not assume liability to the Recipient or third persons, nor will the Federal government reimburse or indemnify the Recipient for its liability due to any losses resulting in any way from the use of this data. NERR water quality data and metadata can be obtained fro the Research Coordinator at the individual NERR site (please see Principle investigators and contact persons), from the Data Manager at the Centralized Data Management Office (please see personnel directory under the general information link on the CDMO home page) and online at the CDMO home page http://cdmo.baruch.sc.edu/ Data are available in text tab-delimited format.
Use Constraints The principal investigator (PI) listed in the enclosed metadata retains the right to be fully credited for having collected and processed the data. Please see the site for further information: http://cdmo.baruch.sc.edu/aboutdata.htm
Data Set Progress
Distribution Format: Ascii File, Formatted For Text Attributes, Declared Format (ASCII)NA
Fees: Data is available at no charge.
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
1700 Elkhorn Road
Province or State: CA
Postal Code: 95076
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2006-02-09
Last DIF Revision Date: 2017-08-23