Elkhorn Slough (ELK) National Estuarine Research Reserve January to December, 1996 Water Quality Metadata Report Latest Update: November 9, 2001
Entry ID:
CDMO_elkwq01-12.96m
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Summary
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. Research objectives Non-point
source pollution is among the highest research priorities within the Elkhorn Slough watershed.
Agriculture and specifically strawberry production, is a significant land use in the watershed,
with agricultural production making up one quarter of land use and strawberries comprising about
8% of the Elkhorn Slough watershed. Agricultural runoff has led to high concentrations of
nutrients and some pesticides in the slough. Several studies have shown that agricultural
practices have an impact on the species composition and ecological processes in Elkhorn Slough.
Two sites within the slough water are being monitored. One site (SM) is in the Reserve at the
edge of the channel next to a Salicornia sp. marsh that is surrounded by a mixture of native and
introduced grasses and shrubs in the uplands. This is a relatively pristine location with
minimal inputs of agricultural runoff. Azevedo Pond (AP), the second site, is surrounded by
strawberry fields with a very narrow (about 3 m) fringe of marsh. The farm surrounding the pond
is part of a project to develop best management practices and new growing
techniques.
SUPPLEMENTAL INFORMATION:
Associated researchers and projects Elkhorn Slough National
Estuarine Research Reserve and the Elkhorn Slough Foundation have had an ongoing program to
monitor 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. Two of these stations on the
Reserve are about 400 m from the SM site. Data collection began at these two stations in
September 1989. A monthly monitoring station is also located at Azevedo Pond within 10 m of the
YSI deployment. Monthly data from the Azevedo Pond are available from March 1992. The University
of California Santa Cruz Agroecology Program has an ongoing project to examine the effects of
agricultural production on an adjacent wetland. Matthew Werner, Marc Los Huertos, Felecia Rein,
Sean Swezey, Mark Silberstein, Andrew De Vogelaere, Ron Tjeerdema have been the principal
investigators. They have made a detailed baseline characterization of wetlands and an adjacent
field under chemically-intensive strawberry production. The Monterey Bay Regional Studies
Program at UCSC awarded graduate fellowships to Marc Los Huertos and Felecia Rein to study the
effects of native vegetation buffer zones on movement of sediment and agricultural run-off. The
overall goals of this program are to test alternative farming practices that can mitigate
negative effects on wetlands while providing a sustainable livelihood for farmers. This research
is occurring on the Azevedo Ranch in a pond and pocket marsh adjacent to the AP YSI deployment
site. Other remarks/notes
CURRENTNESS REFERENCE:
Observed
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. The Elkhorn Slough National Estuarine Research
Reserve encompasses about 1400 acres on the south and east side of the slough. A range of
habitats is represented from uplands of oak and grassland, to saltmarsh, tidal mudflat, and open
water. The tidal range in Elkhorn Slough is approximately 2 meters. Annually, surface salinity
varies between 4.2 - 40.5 psu at the head of the slough, between 15.4 - 34.7 psu in the mid
region and between 14.5 - 34.0 psu at the mouth. Elkhorn Slough is a seasonal estuary with the
major freshwater inputs during the winter rainy season. Carneros Creek empties into the head of
the slough and has significant flow between December and April. Periodic freshwater inputs from
the Salinas River to Elkhorn Slough occur when the mouth of the Salinas River is closed and flow
is diverted through the old channel which empties into the mouth of Elkhorn Slough.YSI
datasondes are deployed at two sampling sites: South Marsh (SM) and Azevedo Pond (AP). SM (36°
49N, 121.44W) is in a side channel of the slough on the Elkhorn Slough
National Estuarine Research Reserve. The major runoff to this site is from grasslands and
uplands on the Reserve and is relatively unimpacted by anthropogenic influences. Water depth at
this site is approximately 2 meters and bottom sediments are silty-clays. The adjacent
intertidal mudflats are often colonized by macroalgae such as Ulva and Enteromorpha. AP (36°
50 N, 121° 45 W) is in a pond which receives fertilizer and pesticide
runoff from a strawberry field in year-round production. The YSI is located about 10m from a
culvert connecting the pond to the slough. Two culverts restrict the tidal range within the pond
to 0.5 m. Water depth of the sonde is approximately 1 meter. Bottom sediments are mainly organic
rich silts. Extensive mats of macroalgae (Ulva and Enteromorpha) occur within the pond. 
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 36.84
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S: 36.8
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E: -121.72
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W: -121.77
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Data Set Citation
Dataset Originator/Creator:
Jane Caffrey, James Smith
Dataset Title:
Elkhorn Slough (ELK) National Estuarine Research Reserve January to December,
1996 Water Quality Metadata Report Latest Update: November 9, 2001
Dataset Release Date:
2006-02-09
Data Presentation Form:
Unknown
Other Citation Details:
NA
Online Resource:
http://cdmo.baruch.sc.edu/
Parent DIF
This data set description is a member of a collection. The
collection is described in
noaanosnerr_d_nerrparent
Temporal Coverage
Start Date:
1996-01-01
Stop Date:
1996-12-31
Quality
ATTRIBUTE ACCURACY REPORT: Anomalous/Suspect Data January 1-31, 1996 South Marsh a) From
1445-1515 on 18 Jan, 1515-1700 on 19 Jan, 1600-1745 on 20 Jan, 1700- 1800 on 21 Jan and
1730-1900 on 22 Jan, all data were suspect because sonde was out of the water. Data removed. b)
Depth values at 1430 and 1530-1545 on 18 Jan, and at 1815 on 21 Jan were negative. Data removed.
... February 1-29, 1996 Azevedo Pond a) SpCond and Salinity data from 1700 on 1 Feb to approximately
1000 on 23 Feb were anomalously high. Data deleted. March 1-31, 1996 South Marsh a) DO data jump
at 1845-1900 on 29 Mar due to switching of sondes. April 1-30, 1996 South Marsh a) DO data from
0745-0800 on 28 Apr were negative due to a possible malfunction in the probe or sonde
electronics. Data removed. b) Any remaining DO data from 0000 on 1 Apr to 1700 on 28 Apr are
suspect due to a possible malfunction in the probe or sonde electronics. Data not removed. May
1-31, 1996 Azevedo Pond a) DO data from 0530-0615, 0730-0800 on 23 May, 2145 on 23 May-1745 on
27 May, 1845 on 27 May to 1430 on 28 May, 2200 on 28 May to 1015 on 29 May, 0100-1015 on 30 May,
and 1945 on 30 May to 1100 on 31 May were negative due to a possible malfunction in the probe or
sonde electronics. Data removed. b) Any remaining DO data from 1630 on 22 May to 2345 on 31 May
are suspect due to a possible malfunction in the probe or sonde electronics. Data not removed.
June 1-30, 1996 Azevedo Pond a) DO data from 0045-0945 on 1 June, and 0415-0800 on 2 June were
negative due to a possible malfunction in the probe or sonde electronics. Data removed. b) Any
remaining DO data from 0000 on 1 June to 2030 on 4 June are suspect due to a possible
malfunction in the probe or sonde electronics. Data not removed. July 1-31, 1996 South Marsh a)
From 0000 1 July to 1130 25 July, DO values were negative due to a possible malfunction in the
probe or sonde electronics. Data removed. b) Any remaining DO data from 0000 on 1 July to 1130
on 25 July are suspect due to a possible malfunction in the probe or sonde electronics. Data not
removed. Azevedo Pond a) Do data at 1700 and 1730 on 9 July, immediately following deployment,
were anomalously high. Data not removed. August 1-31, 1996 Azevedo Pond a) DO data from 2230 on
8 Aug to 1015 on 9 Aug, 0030-0915 on 10 Aug, 0445 and 0515-0900 on 16 Aug, 0530-0915 on 17 Aug,
0630-0800 and 0915 on 18 Aug, 0200-1000 on 19 Aug, 0030-1000 and 1030 on 20 Aug, 2245 on 20 Aug
to 1000 on 21 Aug, 2130 on 21 Aug to 0915 on 22 Aug, 0930 and 1245 on 22 Aug, 2200 on 22 Aug to
1045 on 23 Aug, 2300 on 23 Aug to 1130 on 24 Aug, 0115-1045 and 1145 on 25 Aug, 0400-1030 on 26
Aug, 0730-0745 on 27 Aug, 0545-0815, 0845, 0915 and 2015-2130 on 28 Aug,0345-0915 and 2045-2245
on 29 Aug, 0345-1000 on 30 Aug, 2115 on 30 Aug to 0000 on 31 Aug, and 0400-1030 and 2200-2345 on
31 Aug were negative due to a possible malfunction in the probe or sonde electronics. Data
removed. b) Any remaining DO data from 1400 on 8 Aug to 2345 on 31 Aug are suspect due to a
possible malfunction in the probe or sonde electronics. Data not removed. September 1-30, 1996
Azevedo Pond a) DO data from 0000-0145 and 0400-1130 on 1 Sep, 2245 on 1 Sep to 1115 on 2 Sep,
145 on 2 Sep, 2245 on 2 Sep to 1115 on 3 Sep, 2245 on 3 Sep to 1045 on 4 Sep, 2245 on 4 Sep to
1015 on 5 Sep, 2230 on 5 Sep to 1000 on 6 Sep, 2330 on 6 Sep to 1100 on 7 Sep, and 1130-1215 and
1245-1315 on 7 Sep were negative due to a possible malfunction in the probe or sonde
electronics. Data removed. b) Any remaining DO data from 0000 on 1 Sep to 1400 on 7 Sep are
suspect due to a possible malfunction in the probe or sonde electronics. Data not removed.
October 1-31, 1996 South Marsh a) DO from 1630-2200 on 22 Oct were out of range. Data removed.
November 1-30, 1996 Azevedo Pond a) DO data from 1945-2000, 2100-2115 and 2145 on 18 Nov, 2230
on 18 Nov to 1100 on 19 Nov, 1645 on 19 Nov to 1215 on 24 Nov, 2015 on 24 Nov to 1045 on 25 Nov,
2045 on 25 Nov to 1100 on 26 Nov, 2100 on 26 Nov to 1145 on 27 Nov, 2215 on 27 Nov to 1100 on 28
Nov, 2130 on 28 Nov to 1245 on 29 Nov and 2215 on 29 Nov to 1000 on 30 Nov were negative due to
a possible malfunction in the probe or sonde electronics. Data removed. b) Any remaining DO data
from 1445 on 18 Nov to 2345 on 30 Nov are suspect due to a possible malfunction in the probe or
sonde electronics. Data not removed. December 1-31, 1996 South Marsh a) DO data from 1800 on 23
December to 2345 on 31 December were negative due to a possible malfunction in the probe or
sonde electronics. Data removed. b) Any remaining DO data from 1800 on 23 December to 2345 on 31
December are suspect due to a possible malfunction in the probe or sonde electronics. Data not
removed. Azevedo Pond a) DO data from 0115-1130 on 1 Dec, 2030 on 1 Dec to 1230 on 2 Dec, 1615
and 1715 on 2 Dec, 2315 on 2 Dec to 1000 on 3 Dec, 2130-2145 and 2245-2300 on 3 Dec, 0430-0515,
0730, 0800, 0845-0900, 2215 and 2300 on 4 Dec, 0045 on 4 Dec to 0500 on 5 Dec, 1900-2015 and
2045 on 5 Dec, 2230 on 5 Dec to 0900 on 6 Dec, 0415-0515 on 7 Dec, 0500-0545 on 8 Dec, 0700 on
11 Dec, 0830 to 0915 on 13 Dec, 0400-0630 on 23 Dec and 0700-0930 on 28 Dec were negative due to
a possible malfunction in the probe or sonde electronics. Data removed. b) Any remaining DO data
in Dec are suspect due to a possible malfunction in the probe or sonde electronics. Data not
removed. Post deployment information LOGICAL CONSISTENCY REPORT: NACOMPLETENESS REPORT: Data
collection period Sampling at both sites began simultaneously on June 26, 1995 and data
collection is ongoing. Deleted Data Missing Data January 1-31, 1996 South Marsh a) All data from
1445-1515 on 18 Jan, 1515-1700 on 19 Jan, 1600-1745 on 20 Jan, 1700-1800 on 21 Jan and 1730-1900
on 22 Jan suspected to be recorded while sonde was out of the water. Data removed. b) Depth
values at 1430 and 1530-1545 on 18 Jan, and at 1815 on 21 Jan were negative and removed from the
data set. c) All data missing from 1145-1415 on 30 Jan because sonde was out of water for
downloading and calibration. d) No turbidity data because turbidity probe was not installed.
Azevedo Pond a) All data missing from 1415 on 30 Jan to 2345 on 31 Jan because sonde was out of
water for downloading and calibration. b) No turbidity data because turbidity probe was not
installed. February 1-29, 1996 South Marsh a) All data missing from 1100-1645 on 29 Feb because
sonde was out of water for downloading and calibration. b) No turbidity data because turbidity
probe was not installed. Azevedo Pond a) All data missing from 0000-1645 on 1 Feb because sonde
was out of water for downloading and calibration. b) SpCond and Salinity data from 1700 on 1 Feb
to approximately 1000 on 23 Feb were anomalously high. Data deleted. c) All data missing from
1015-1430 on 23 Feb because sonde was out of water for downloading and calibration. d) No
turbidity data because turbidity probe was not installed. March 1;31, 1996 South Marsh
a) No turbidity data because turbidity probe was not installed.\ Azevedo Pond a) All data
missing from 1430 on 24 Mar to 1300 on 30 Mar because sonde was out of water for downloading and
calibration. b) No turbidity data because turbidity probe was not installed. April
1;30, 1996 South Marsh a) DO data from 0745-0800 on 28 Apr were negative due to a
possible malfunction in the probe or sonde electronics. Data removed. b) All data missing from
1715-1845 on 28 Apr because sonde was out of water for downloading and calibration. c) No
turbidity data because turbidity probe was not installed. Azevedo Pond a) All data missing from
2030 on 18 Apr to 1400 on 26 Apr because sonde was out of water for downloading and calibration.
b) No turbidity data because turbidity probe was not installed May 1;31, 1996 South
Marsh a) All data missing from 1600-1745 on 22 May because sonde was out of water for
downloading and calibration. b) No turbidity data because turbidity probe was not installed
Azevedo Pond a) DO data from 0530-0615, 0730-0800 on 23 May, 2145 on 23 May to 1745 on 27 May,
1845 on 27 May to 1430 on 28 May, 2200 on 28 May to 1015 on 29 May, 0100-1015 on 30 May, and
1945 on 30 May to 1100 on 31 May were negative due to a possible malfunction in the probe or
sonde electronics. Data removed. b) All data missing from 1115-1615 on 22 May because sonde was
out of water for downloading and calibration. c) No turbidity data because turbidity probe was
not installed. June 1;30, 1996 South Marsh a) No data collected from 1815 on 21 June
to 1545 on 26 June because sonde was out of water for downloading and calibration. b) No
turbidity data because turbidity probe was not installed. Azevedo Pond a) DO data from 0045-0945
on 1 June, 0415-0800 on 2 June were negative due to a possible malfunction in the probe or sonde
electronics. Data removed b) All data missing at 2045 on 4 June because sonde was out of water
for downloading and calibration. c) No turbidity data because turbidity probe was not installed.
July 1-31, 1996 South Marsh a) From 0000 1 July to 1130 25 July, DO values were negative due to
a possible malfunction in the probe or sonde electronics. Data removed. b) All data missing at
1145 on 25 July because sonde was out of water for downloading and calibration. c) No turbidity
data because turbidity probe was not installed. Azevedo Pond a) All data missing from 2115 on 4
July to 1645 on 9 July because sonde was out of water for downloading and calibration. b) No
turbidity data because turbidity probe was not installed. August 1-31, 1996 South Marsh a) All
data missing from 1215 on 24 Aug to 1745 on 25 Aug because sonde was out of water for
downloading and calibration. b) No turbidity data because turbidity probe was not installed.
Azevedo Pond a) DO data from 2230 on 8 Aug to 1015 on 9 Aug, 0030-0915 on 10 Aug, 0445 and
0515-0900 on 16 Aug, 0530-0915 on 17 Aug, 0630-0800 and 0915 on 18 Aug, 0200-1000 on 19 Aug,
0030-1000 and 1030 on 20 Aug, 2245 on 20 Aug to 930 on 21 Aug, 945-1000 on 21 Aug, 2130 on 21
Aug to 0915 on 22 Aug, 0930 and 1245 on 22 Aug, 2200 on 22 Aug to 1045 on 23 Aug, 2300 on 23 Aug
to 1130 on 24 Aug, 0115-1045 and 1145 on 25 Aug, 0400-1030 on 26 Aug, 0730-0745 on 27 Aug,
0545-0815, 0845, 0915 and 2015-2130 on 28 Aug, 0345-0915 and 2045-2245 on 29 Aug, 0345-1000 on
30 Aug, 2115 on 30 Aug to 0000 on 31 Aug, and 0400-1030 and 2200-2345 on 31 Aug were negative
due to a possible malfunction in the probe or sonde electronics. Data removed. b) All data
missing at 1345 on 8 Aug because sonde was out of water for downloading and calibration. c) No
turbidity data because turbidity probe was not installed. September 1-30, 1996 South Marsh a)
All data missing from 1530 on 21 Sep to 1745 on 23 Sep because sonde was out of water for
downloading and calibration. b) No turbidity data because turbidity probe was not installed.
Azevedo Pond a) DO data from 0000-145 and 0400-1130 on 1 Sep, 2245 on 1 Sep to 1115 on 2 Sep,
1145 on 2 Sep, 2245 on 2 Sep to 1115 on 3 Sep, 2245 on 3 Sep to 1030 on 4 Sep, 1045 on 4 Sep,
2245 on 4 Sep to 1015 on 5 Sep, 2230 on 5 Sep to 1000 on 6 Sep, 2330 on 6 Sep to 1100 on 7 Sep,
and 1130-1215 and 1245-1315 on 7 Sep were negative due to a possible malfunction in the probe or
sonde electronics. Data removed. b) All data missing from 1415 on 7 Sep to 1845 on 9 Sep because
sonde was out of water for downloading and calibration. c) No turbidity data because turbidity
probe was not installed. October 1-31, 1996 South Marsh a) DO from 1630-2200 on 22 Oct were out
of range. Data removed. b) All data missing from 1915 on 7 Oct to 1615 on 22 Oct because sonde
was out of water for downloading and calibration. c) No turbidity data because turbidity probe
was not installed Azevedo Pond a) All data missing at 1515 on 7 Oct because sonde was out of
water for downloading and calibration. b) No turbidity data because turbidity probe was not
installed. November 1-30, 1996 South Marsh a) All data missing from 1645 on 21 Nov to 1645 on 25
Nov because sonde was out of water for downloading and calibration. b) No turbidity data because
turbidity probe was not installed Azevedo Pond a) DO data from 1945-2000, 2100-2115 and 2145 on
18 Nov, 2230 on 18 Nov to 1100 on 19 Nov, 1645 on 19 Nov to 1215 on 24 Nov, 2015 on 24 Nov to
1045 on 25 Nov, 2045 on 25 Nov to 1100 on 26 Nov, 2100 on 26 Nov to 1145 on 27 Nov, 2215 on 27
Nov to 1100 on 28 Nov, 2130 on 28 Nov to 1245 on 29 Nov and 2215 on 29 Nov to 1000 on 30 Nov
were negative due to a possible malfunction in the probe or sonde electronics. Data removed. b)
All data missing from 1545 on 6 Nov to 1430 on 18 Nov because sonde was out of water for
downloading and calibration. c) No turbidity data because turbidity probe was not installed
December 1-31, 1996 South Marsh a) DO data from 1800 on 23 December to 2345 on 31 December were
negative due to a possible malfunction in the probe or sonde electronics. Data removed. b) All
data missing from 1700-1745 on 23 Dec because sonde was out of water for downloading and
calibration. c) No turbidity data because turbidity probe was not installed. Azevedo Pond a) DO
data from 0115-1130 on 1 Dec, 2030 on 1 Dec to 1230 on 2 Dec, 1615 and 1715 on 2 Dec, 2315 on 2
Dec to 1000 on 3 Dec, 2130-2145 and 2245-2300 on 3 Dec, 0430-0515, 0730, 0800, 0845-0900, 2215
and 2300 on 4 Dec, 0045 on 4 Dec to 0500 on 5 Dec, 1900-2015 and 2045 on 5 Dec, 2230 on 5 Dec to
0900 on 6 Dec, 0415-0515 on 7 Dec, 0500-0545 on 8 Dec, 0700 on 11 Dec, 0830-0915 on 13 Dec,
0400-0630 on 23 Dec and 0700-0930 on 28 Dec were negative due to a possible malfunction in the
probe or sonde electronics. Data removed. b) All data missing from 1400-1415 on 6 Dec because
sonde was out of water for downloading and calibration. c) No turbidity data because turbidity
probe was not installed. 8 LINEAGE/PROCESS STEP: PROCESS DESCRIPTION: Additional Description:
Entry verification The Centralized Data Management Office re-processed all SWMP water data
collected from 1995-2002 to include an identifying station code (three letter reserve code, two
letter sampling site code and data type code), a four digit year date stamp (mm/dd/yyyy) and a
corrected time column (hh:mm). With the new format, the use of periods to denote deleted or
missing data has been abandoned. Hence, all periods contained in the SWMP water data collected
prior 2003 were removed and left blank. : Data are uploaded to the PC from the YSI 6000 and
graphs are produced and examined using the PC 6000 software. Data are also uploaded in a
comma-delimited format from the YSI to the PC. Edited files are created by removing headers,
footers, and spaces on a PC in Excel 5.0. Suspect data are evaluated using QA/QC Excel 5.0
macros (version 3.0) from CDMO. Missing data from YSI maintenance are inserted into the
spreadsheet and are denoted by periods (.). Edited files are merged to create one full month of
data. Edited and raw data are archived at Elkhorn Slough NERR, then uploaded to CDMO NERR
server. Jimmy Smith is responsible for the editing and archiving of data. PROCESS DATE: 20060209
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
LIABILITY: Distribution
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
COMPLETE
Distribution
Distribution Format:
Ascii File, Formatted For Text Attributes, Declared Format (ASCII)NA
Fees:
Data is available at no charge.
Personnel
Role:
TECHNICAL CONTACT
Role:
DIF AUTHOR
City:
Watsonville
Province or State:
CA
Postal Code:
95076
Country:
USA
Creation and Review Dates
DIF Creation Date:
2006-02-09
Last DIF Revision Date:
2008-05-27
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