Chesapeake Bay Maryland (CBM) NERR Nutrient Metadata February-December 2004 Latest Update: July 21, 2005
Entry ID:
CDMO_cbmnut02-12.04m
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Summary
Abstract:
Nutrient monitoring is conducted at 26 National Estuarine Research Reserves (NERR) from
four locations within or adjacent to the reserve on a monthly basis of the following parameters:
orthophosphate, ammonium, nitrite, nitrate, and chlorophyll a. Note: Reserves may collect
additional parameters which are available by searching the Yearly Files directory.
Purpose:
Research objectives The principal objectives of this effort are to provide baseline nutrient concentration data at fixed sites throughout the Chesapeake Bay National Estuarine Research Reserve in Maryland's (CBM NERR) tidal waters. This information supports the National Estuarine Research Reserve's (NERR) System Wide Monitoring Program (SWMP) and supplements ... water quality
information taken at the same fixed sites. Specific goals of this effort include: 1) tracking
and recording nutrient conditions to better understand and explain current conditions with the
aid of additional data (water quality and meteorological) collected concurrently 2) creating a
database capable of detecting long-term changes in nutrient conditions of these systems 3)
recording and identifying temporal and spatial differences in nutrient conditions to include
changes on a diel time frame and to collect ancillary data in support of other research efforts.
At CBM NERR, water quality and nutrient data were collected at four sites during 2004. Three
sites are at the Jug Bay Component of the Reserve and one site is at the Otter Point Creek
Component. The three sites at Jug Bay were selected in an effort to examine water quality and
nutrient information across different spatial scales and at sites demonstrating different levels
of anthropogenic activities. The site at Otter Point Creek was selected to provide baseline
information for the Otter Point Creek site and to use for comparison to one or more of the Jug
Bay sites. a) Monthly Grab Sampling Program The goals of the monthly grab samples are to create
a long-term database of nutrient information at each site for the purpose of detecting temporal
and spatial changes. This nutrient information supplements water chemistry data to provide a
complete picture of water quality at the NERR sites. b) Diel Sampling Program The goal of the
diel sampling is to catalog short-term variability in nutrient concentrations across different
tidal cycles at the Jug Bay Railroad site. This temporal nutrient data provides a comprehensive
look at the variation in water quality over a 24- hour period.
SUPPLEMENTAL INFORMATION:
Associated researchers and projects The Jug Bay Wetlands Sanctuary staff has been collecting
weekly to monthly temperature, salinity, dissolved oxygen, and nutrient samples at various tidal
and non-tidal sites throughout the Jug Bay marsh since 1989. One of their historic sites
includes the current (RR) site as well as the historic (1995-2002) (JB) site. Sampling for their
sites is done monthly throughout the year (when ice is not present) and includes parameters such
as nitrate/nitrite, ammonium and chlorophyll a. Additionally, the staff samples at other sites
throughout the Jug Bay marsh, which provide additional similar data at a larger spatial scale.
Staff at the Anita C. Leight Estuary Center at Otter Point Creek, in conjunction with CBNERR/MD
staff, have also been collecting bi-weekly to monthly temperature, salinity, dissolved oxygen,
total suspended solids, chlorophyll a, and nutrient samples (to include nitrate/nitrite,
ammonium, ortho-phosphate, total nitrogen and total phosphorus) at the same location as
datalogger OC and 5 other sites in the OPC marsh since 2002. For more information on either the
Jud Bay Wetlands Sanctuary or Otter Point Creek monitoring, contact Julie Bortz, the Reserve's
Research Coordinator. Additional discrete nutrient data and semi-continuous water quality data
is also available through the Department of Natural Resources Continuous Monitoring Program (see
www.eyesonthebay.net) that provides increased spatial coverage of many of the same parameters
around both RR and OC sites for 2004. This monitoring program included as many as 28 additional
continuous monitoring sites (similar to the CBM NERR effort) throughout Maryland tidal waters
sampled semi-continuously (every 15 minutes) from April-October 2004. In addition to the high
temporal resolution of water quality at these sites, Maryland Department of Natural Resources
also conducts water quality cruises between and amongst many of these same sites which are used
to create interpolated water quality maps, providing a high degree of spatial resolution around
their permanent continuous monitoring (YSI sonde) sites. Interpolated water quality maps are
available for both the Jug Bay and Otter Point Creek sites through the Maryland Department of
Natural Resources or CBM NERR. The Maryland Department of Natural Resources Continuous
Monitoring Program began in 1999 with the number of sites monitored increasing yearly to 2004.
For more information on this program and the water quality monitoring cruises see
www.eyesonthebay.net or contact Chris Heyer at the Maryland Department of Natural Resources.
Other Remarks The 2004 sampling year was a relatively typical year for the Chesapeake Bay region
regarding temperature and precipitation. For more information regarding rainfall and storms
which may have impacted water quality and nutrient concentrations at the above four sites,
meteorological information is available at both sites and can be obtained by contacting Julie
Bortz, the Reserve's Research Coordinator. In addition to the meteorological, water quality, and
nutrient data, more precise depth data is available for the OC site via an YSI 600LS vented
depth sonde. This data covers the dates of October 8, 2004 to December 31, 2004.
CURRENTNESS REFERENCE:
Observed
SPATIAL DATA ORGANIZATION INFORMATION:
Indirect Spatial Reference: Site location and character The Chesapeake Bay National Estuarine Research Reserve in Maryland
consists of three components: Otter Point Creek on the Bush River along the upper western shore
of the Chesapeake Bay, Jug Bay along the Patuxent River in the middle Bay and Monie Bay on the
lower eastern shore of the Chesapeake Bay. At CBM NERR, water quality and nutrient data are
collected at four sites. Three sites are at the Jug Bay Component of the Reserve and one site is
at the Otter Point Creek Component. The Jug Bay Component of the Reserve is located in the tidal
headwaters of the Patuxent River. The watershed for this portion of the river includes portions
of the DC Metropolitan area but has dense, tracks of protected riparian areas surrounding this
portion of the river. Jug Bay itself, is a 722-acre tidal estuary providing a narrow transition
zone between brackish marshes and upland freshwater wetlands. The broad, shallow waters of Jug
Bay support a profusion of freshwater plants and animals. Vegetation crowds the river channel
and forms an interlaced pattern of tidal and non-tidal marshes, swamps and forested wetlands
surrounded by upland woods and fields. The Otter Point Creek Component of the Reserve is located
along the tidal headwaters of the Bush River, which drains much of Harford County, including the
rapidly growing town of Bel Air, Maryland. Otter Point Creek is a tributary of the Bush River in
the upper Chesapeake Bay and consists of 672 acres of open water, tidal marshes, forested
wetlands and upland hardwood forests, surrounded by major highways, large residential
communities, and heavy commercial and industrial development. The following is a list of sites
with a detailed description of site characteristics and other relevant information. Mataponi
Creek (MC) 38° 44.599'N, 76° 42.446'W (NAD83) or 38.74331667, -76.70743333 (GIS format) Site
MC is located at the Jug Bay Component of the Reserve, in a small tributary (Mataponi Creek) off
the upper tidal headwaters of the Patuxent River, Maryland. MC is 2.4 km upstream from the mouth
and located in the midchannel of the creek, which is approximately 7m wide at that point. The
southern bank is steep and covered mainly with hardwood trees while the Northern bank is tidal
marsh. The YSI water quality sonde was deployed vertically in a perforated PVC pipe. Average
depth at this site is roughly 0.7 meters with a mean tidal fluctuation of approximately 0.6 m.
The YSI is deployed 0.25 m off of the creek bottom. Salinities at this site rarely exceed 0.1
ppt. The bottom habitat is soft sediment, and submerged macrophytes are abundant and dense
during the summer months. Because this site is located along the main channel of the Mataponi
Creek, water quality is reflective of the general quality of water flowing along the main
portion of the creek. The submerged macrophyte community at this site is seasonally very dense
and thus water quality is thought to be strongly influenced by the presence of SAV during the
summer months. Because of the dense submerged macrophyte community and limited degree of
anthropogenic activities occurring within the watershed of this site, MC is thought to be a
"reference" water quality site for the Reserve. Historic sampling at this site began in 2003.
Railroad Bridge (RR) 38° 46.877'N, 76° 42.822'W (NAD 83) or 38.78128333, -76.7137 (GIS format)
Site RR is located in the mainstem of the upper tidal headwaters of the Patuxent River,
Maryland. The site is slightly upstream (roughly 0.3km) from Jackson's Landing at the Patuxent
River Park (previous PR site). This section of the Patuxent River is approximately 70m wide and
average depth at the site is 1.4m. The YSI sonde is deployed 0.25 m off of the river bottom.
Bottom habitat is soft sediment, and submerged macrophytes are evident in the shallow areas
(<0.5m MLW) during summer months. Mean tidal fluctuation is approximately 0.6 m. The site
location (RR) is at the end of the old railroad bed and is deployed vertically in a perforated
PVC pipe near midchannel of the Patuxent River. Because this site is located along the main
channel of the Patuxent River, water quality is reflective of the general quality of water
flowing along the main portion of the river. The site is roughly 1km downstream of the
confluence of the Western Branch tributary and the Patuxent River Mainstem. Thus water quality
is influenced by Western Branch tributary which receives tertiary treated effluent from a large
wastewater treatment plant (averaging 10-20 mgd ) which discharges directly into the Western
Branch tributary of the Patuxent River just upstream of site IP. Because of the location of this
site along the main portion of the Patuxent River, this site is thought to be characteristic of
this portion of the Patuxent River and thus similar to the historic (1995-2002) site (Jug Bay)
located at 38° 46' 50.6" N, 76° 42' 29.1" W. Iron Pot Landing (IP) 38° 47.760'N, 76° 43.248'
W (NAD 83) or 38.796, -76.7208 (GIS Format) Site IP is located 2.09km from the mouth of Western
Branch. The YSI sonde at IP is deployed vertically in a perforated PVC pipe and attached to a
small pier near midchannel of the river and has an average depth of 1.6m. The YSI is deployed
0.25 m off of the river bottom. The site is roughly 1km downstream of a large (10-20 mgd)
wastewater treatment plant effluent discharge site. The river is approximately 15m wide and
flows through extensive riparian buffers. Both banks of the river are flanked by hardwood flora.
Tides are semi-diurnal and mean tidal fluctuation is approximately 0.6 m. Salinity at this site
is generally 0.1 ppt. Bottom habitat is soft sediment, and narrow submerged macrophyte grassbeds
are occasionally evident in the shallow areas downstream during the summer months. Because of
the proximity of this site to the discharge location for a large WWTP, this site is considered
an "impacted" site for the reserve. Historic sampling at this site began in 2003. Otter Point
Creek (OC) 39° 27.047'N, 76° 16.474'W (NAD 83) or 39.45078333, -76.27456667 (GIS Format) Site
OC is located within the Otter Point Creek Component of the Reserve, in the tidal headwaters of
the Bush River. The Otter Point Creek component is a large but shallow tidally flooded marsh
with average depths less then 1m on low tide. The site is approximately 0.3km from the Anita C.
Leight Estuary Center. Site OC is deployed vertically in a perforated PVC pipe and has an
average depth of 0.7m. The YSI is deployed 0.25 m off of the creek bottom. Bottom habitat is
extremely soft sediment, and submerged macrophyte communities inundate the site during summer
months, creating a dense and almost impenetrable ground cover. Salinity at this station rarely
rises above 0.1 ppt. Tides in Otter Point Creek are semi-diurnal and have a mean range of about
0.3 m. The average water levels are generally lower in the winter due to north and northwest
winds that increase the egress from Chesapeake Bay. The sonde was periodically exposed to air at
some low tides, and sediments at the site are extremely fine and flocculent. Because of the
shallowness of the tidal marsh, coupled with the dramatic daily changes in the depth,
deployments at the site presented many problems. These problems included periodic exposure of
the sonde, very high turbidity and sedimentation rates associated with tidal infiltration and
wind and wave generated resuspension, which caused severe fouling of the probes. Water quality
at the site represented extreme shallow water habitats. Thus it is not uncommon to see very
large fluctuations in temperature and dissolved oxygen at this site ranging from complete anoxia
to full saturation, due in part to the shallow nature of the site, presence of dense macrophyte
communities, and the effects of marsh processes on water quality. This site is thought to be
representative of water quality within the Otter Point Creek component throughout most of the
year, with the exception of the summer months when dense submerged macrophyte communities
greatly influence the site. Historic sampling at this site began in 2003. 
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 39.45
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S: 38.19
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E: -75.79
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W: -76.71
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Data Set Citation
Dataset Originator/Creator:
Julie Bortz-Research, John Zimmerelli, Chris Trumbauer, Carl Zimmermann, Chris
Heyer
Dataset Title:
Chesapeake Bay Maryland (CBM) NERR Nutrient Metadata February-December 2004
Latest Update: July 21, 2005
Dataset Release Date:
2006-02-23
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:
2004-01-01
Stop Date:
2004-12-31
Quality
ATTRIBUTE ACCURACY REPORT: Limits of Detection Dates in use for 2004. Methods References,
and Holding Times and Conditions. Parameter (Units) Detection Limit (or Range) Method Reference
Holding Time and Condition Orthophosphate (mg/L as P) 0.0006 mg/L EPA method 365.1 (EPA 1979)
Freezing-28 d Nitrite (mg/L as N) 0.0002 mg/L EPA ... method 353.2 (EPA 1979) Freezing-28 d Nitrite
+ Nitrate (mg/L as N) 0.0007 mg/L EPA method 353.2 (EPA 1979) Freezing-28 d Ammonium (mg/L as N)
0.003 mg/L EPA method 350.1 (EPA 1979) Freezing-28 d Chlorophyll a (µg/L) 0.1 µg/L APHA (1981)
Freezing-28 d The MDL is determined as 3 times the standard deviation of a minimum of 7
replicates of a single low concentration sample. Reporting of Missing Data and Data with
Concentrations Lower than Method Detection Limits Nutrient/Chla comment codes and definitions
are provided in the following table. Missing data are denoted by a blank cell " " and commented
coded with an "M". Laboratories in the NERRS System submit data that are censored at a lower
detection rate limit, called the Method Detection Limit or MDL. MDL's for specific parameters
are listed in the Laboratory Methods and Detection Limits Section (Section II, Part 12) of this
document. Concentrations that are less than this limit are denoted by a -9999 and comment coded
with a "B" in the variable code comment column. For example, the measured concentration of NO23F
was 0.0005 mg/l as N (MDL=0.0008), the reported value would be -9999 with a "B" placed in the
NO23F comment code column. Calculated parameters are comment coded with a "C" and if any of the
components used in the calculation are below the MDL, the calculated variable is denoted by
-9999 and also comment coded with a "B". If a calculated value is negative, the value is
reported as a -9999. Variable Comment Codes Comment Code Definition A Value above upper limit of
method detection B Value below method detection limit C Calculated value D Data deleted or
calculated value could not be determined due to deleted data, see metadata for details H Sample
held beyond specified holding time K Check metadata for further details M Data missing, sample
never collected or calculated value could not be determined due to missing data P Significant
precipitation (reserve defined, see metadata for further details) U Lab analysis from
unpreserved sample S Data suspect, see metadata for further details QA/QC Programs Precision
Field Variability - The Maryland Department of Natural Resources (MDNR) maintains CBM NERR sites
in conjunction with their Continuous Monitoring Program, which maintains over 30 sites where
water quality and nutrient data are collected. As such, field variability is checked with 10% of
all samples being taken as duplicates. These duplicate samples are field duplicates taken as a
replicate, or additional sample, taken concurrently at the time of sampling. Laboratory
Variability - The Chesapeake Biological Laboratory (CBL) is responsible for analyzing CBM NERR
nutrient samples as well as other nutrient samples taken through MDNR's Continuous Monitoring
Program. CBL verifies the quality of their analytical process by running 10% of all samples
through an additional test to duplicate procedures and check the accuracy of their reporting.
Inter-organizational splits - All nutrient parameters for CBM NERR were analyzed by CBL with the
exception of Chlorophyll A which is sent to the Department of Health and Mental Hygiene (DHMH)
where samples are analyzed using the same procedures as CBL but at no cost to CBM NERR and MDNR.
DHMH is an EPA certified laboratory. Accuracy Sample Spikes - Sample outliers range from 85 to
115 percent. CBL typically gets 90 to 110 percent recovery. Standard Reference Material Analysis
- none Cross Calibration Exercises - Nutrient Analytical Services has participated in many cross
calibration exercises. Participation in such programs is an excellent means of determining
accuracy of results. Examples of such cross calibration exercises include the Chesapeake Bay
Program Quarterly Split Samples, Chesapeake Bay Program Blind Audits, USGS Standard Reference
Sample Project, US EPA Method Validation Studies and International Council for the Exploration
of the Sea Inter-comparison Exercise for Nutrients in Sea Water. LOGICAL CONSISTENCY REPORT:
NACOMPLETENESS REPORT: Data collection period Nutrient samples were collected using an Alpha
Bottle or ISCO Sampler. At Railroad Bridge (Jug Bay Wetlands Sanctuary)(RR) sampling began on
February 10, 2004 and continued through December 21, 2004; Mataponi Creek (MTI) began March 11,
2004 and continued through December 21, 2004; Iron Pot Landing (IP) began February 10, 2004 and
continued through December 21, 2004; and Otter Point Creek (OC) began March 10, 2004 and
continued through December 16, 2004. (RR) Railroad Monthly Grab Sampling Station Code Date Time
Monitoring Program Rep cbmrrnut 2/10/2004 12:15 1 1 cbmrrnut 2/10/2004 12:15 1 2 cbmrrnut
3/11/2004 9:15 1 1 cbmrrnut 3/11/2004 9:15 1 2 cbmrrnut 4/6/2004 7:30 1 1 cbmrrnut 4/20/2004
11:15 1 2 cbmrrnut 4/20/2004 11:15 1 1 cbmrrnut 5/4/2004 7:30 1 1 cbmrrnut 5/18/2004 8:00 1 2
cbmrrnut 5/18/2004 8:00 1 1 cbmrrnut 6/3/2004 9:45 1 1 cbmrrnut 6/15/2004 11:15 1 1 cbmrrnut
6/15/2004 11:16 1 2 cbmrrnut 6/29/2004 8:30 1 1 cbmrrnut 7/13/2004 8:15 1 1 cbmrrnut 7/27/2004
8:45 1 2 cbmrrnut 7/27/2004 8:45 1 1 cbmrrnut 8/10/2004 10:30 1 1 cbmrrnut 8/24/2004 8:00 1 2
cbmrrnut 8/24/2004 8:00 1 1 cbmrrnut 9/7/2004 8:00 1 1 cbmrrnut 9/21/2004 8:00 1 2 cbmrrnut
9/21/2004 8:00 1 1 cbmrrnut 10/5/2004 8:45 1 1 cbmrrnut 10/20/2004 8:15 1 2 cbmrrnut 10/20/2004
8:15 1 1 cbmrrnut 11/1/2004 14:15 1 1 cbmrrnut 11/22/2004 9:45 1 2 cbmrrnut 11/22/2004 9:45 1 1
cbmrrnut 12/8/2004 10:00 1 1 cbmrrnut 12/21/2004 9:45 1 2 cbmrrnut 12/21/2004 9:45 1 1 (RR)
Railroad Diel Grab Sampling Station Code Start Date Start Time End Date End Time cbmrrnut
3/25/2004 13:30 3/26/2004 14:30 cbmrrnut 4/28/2004 10:30 4/29/2004 11:30 cbmrrnut 5/27/2004 8:30
5/28/2004 9:30 cbmrrnut 6/30/2004 8:45 7/1/2004 9:45 cbmrrnut 7/27/2004 6:00 7/28/2004 9:30
cbmrrnut 8/24/2004 8:15 8/25/2004 9:15 cbmrrnut 9/28/2004 8:30 9/29/2004 9:30 cbmrrnut
10/20/2004 8:15 10/21/2004 9:15 cbmrrnut 11/22/2004 9:45 11/23/2004 10:45 cbmrrnut 12/21/2004
10:15 12/22/2004 8:45 (MC) Mataponi Creek Station Code Date Time Monitoring Program Rep cbmmcnut
3/11/2004 12:00 1 1 cbmmcnut 3/11/2004 12:00 1 2 cbmmcnut 4/8/2004 11:00 1 1 cbmmcnut 4/20/2004
8:30 1 2 cbmmcnut 4/20/2004 8:30 1 1 cbmmcnut 5/4/2004 10:30 1 1 cbmmcnut 5/18/2004 9:30 1 2
cbmmcnut 5/18/2004 9:30 1 1 cbmmcnut 6/3/2004 13:00 1 1 cbmmcnut 6/15/2004 8:45 1 1 cbmmcnut
6/15/2004 8:46 1 2 cbmmcnut 6/29/2004 12:00 1 1 cbmmcnut 7/13/2004 10:45 1 1 cbmmcnut 7/27/2004
10:45 1 2 cbmmcnut 7/27/2004 10:45 1 1 cbmmcnut 8/10/2004 13:30 1 1 cbmmcnut 8/24/2004 11:00 1 2
cbmmcnut 8/24/2004 11:00 1 1 cbmmcnut 9/7/2004 10:45 1 1 cbmmcnut 9/21/2004 10:45 1 2 cbmmcnut
9/21/2004 10:45 1 1 cbmmcnut 10/5/2004 13:00 1 1 cbmmcnut 10/20/2004 11:00 1 2 cbmmcnut
10/20/2004 11:00 1 1 cbmmcnut 11/1/2004 11:00 1 1 cbmmcnut 11/22/2004 12:15 1 2 cbmmcnut
11/22/2004 12:15 1 1 cbmmcnut 12/8/2004 12:45 1 1 cbmmcnut 12/21/2004 12:30 1 2 cbmmcnut
12/21/2004 12:30 1 1 (IP) Iron Pot Landing Station Code Date Time Monitoring Program Rep
cbmipnut 2/10/2004 13:45 1 1 cbmipnut 2/10/2004 13:47 1 2 cbmipnut 3/11/2004 10:45 1 1 cbmipnut
3/11/2004 10:45 1 2 cbmipnut 4/6/2004 9:00 1 1 cbmipnut 4/20/2004 9:45 1 2 cbmipnut 4/20/2004
9:45 1 1 cbmipnut 5/4/2004 9:00 1 1 cbmipnut 5/18/2004 10:45 1 2 cbmipnut 5/18/2004 10:45 1 1
cbmipnut 6/3/2004 11:45 1 1 cbmipnut 6/15/2004 10:00 1 1 cbmipnut 6/15/2004 10:01 1 2 cbmipnut
6/29/2004 10:30 1 1 cbmipnut 7/13/2004 9:30 1 1 cbmipnut 7/29/2004 9:30 1 2 cbmipnut 7/29/2004
9:30 1 1 cbmipnut 8/10/2004 12:15 1 1 cbmipnut 8/24/2004 10:00 1 2 cbmipnut 8/24/2004 10:00 1 1
cbmipnut 9/7/2004 9:30 1 1 cbmipnut 9/21/2004 9:30 1 2 cbmipnut 9/21/2004 9:30 1 1 cbmipnut
10/5/2004 10:00 1 1 cbmipnut 10/20/2004 9:30 1 2 cbmipnut 10/20/2004 9:30 1 1 cbmipnut 11/1/2004
12:45 1 1 cbmipnut 11/22/2004 11:00 1 2 cbmipnut 11/22/2004 11:00 1 1 cbmipnut 12/8/2004 11:30 1
1 cbmipnut 12/21/2004 11:15 1 2 cbmipnut 12/21/2004 11:15 1 1 (OC) Otter Point Creek Station
Code Date Time Monitoring Program Rep cbmocnut 3/10/2004 9:15 1 1 cbmocnut 3/10/2004 9:15 1 2
cbmocnut 3/30/2004 8:15 1 1 cbmocnut 4/14/2004 7:15 1 1 cbmocnut 4/27/2004 7:15 1 2 cbmocnut
4/27/2004 7:15 1 1 cbmocnut 5/11/2004 8:15 1 1 cbmocnut 5/25/2004 9:00 1 2 cbmocnut 5/25/2004
9:00 1 1 cbmocnut 6/8/2004 8:00 1 1 cbmocnut 6/22/2004 9:00 1 2 cbmocnut 6/22/2004 9:00 1 1
cbmocnut 7/7/2004 8:45 1 1 cbmocnut 7/20/2004 8:15 1 2 cbmocnut 7/20/2004 8:15 1 1 cbmocnut
8/3/2004 7:45 1 1 cbmocnut 8/17/2004 10:00 1 2 cbmocnut 8/17/2004 10:00 1 1 cbmocnut 8/31/2004
7:30 1 1 cbmocnut 9/14/2004 7:30 1 1 cbmocnut 9/29/2004 8:30 1 2 cbmocnut 9/29/2004 8:30 1 1
cbmocnut 10/13/2004 8:45 1 1 cbmocnut 10/26/2004 8:00 1 2 cbmocnut 10/26/2004 8:00 1 1 cbmocnut
11/18/2004 9:00 1 1 cbmocnut 11/30/2004 9:00 1 2 cbmocnut 11/30/2004 9:00 1 1 cbmocnut
12/16/2004 10:30 1 2 cbmocnut 12/16/2004 10:30 1 1 LINEAGE/PROCESS STEP: PROCESS DESCRIPTION:
Additional Description: Entry verification Nutrient samples are sent to Nutrient Analytical
Services Laboratory (NASL) at the University of Maryland's Chesapeake Biological Laboratory. The
samples are analyzed and problems in sample quality are indicated with an Analytical Problem
Code (APC). Additionally, quality assurance/quality control (QA/QC) samples are analyzed and
reviewed by NASL to ensure their instrumentation and analytical procedures are not producing
erroneous results. Chlorophyll samples are sent to the Maryland Department of Health and Mental
Hygiene (DHMH) for analysis. Data from DHMH is handled and QA/QC'd following similar protocols
to those in place by NASL. The APC codes in use have been regionally accepted by all partners
participating in water quality monitoring of the Chesapeake Bay under guidance of the
Environmental Protection Agency's Chesapeake Bay Program Office (CBP). The nutrient data is sent
from NASL to the Maryland Department of Natural Resources' Tidewater Ecosystem Assessment
division where it is entered into our main water quality database and is merged with the time
and date matched field and chlorophyll data. Any APC codes associated with nutrient or
chlorophyll data that indicate the data should be rejected are hidden and made unavailable. Data
values that fall below CBP accepted Minimum Detection Limits (MDL) are hidden and a new value is
set at the MDL and is flagged to indicate the value has been set to MDL. Once the data has been
entered into the data management system, a series of reports and plots are generated for review
by an analyst (Chris Heyer). Automatic range checks flag and report any data values that exceed
the ranges. The analyst reviews the data and the range check reports to determine if the data
are acceptable based on conditions at adjacent stations, weather at the time of sampling, and
historic data. Data that are rejected during this QA/QC process are hidden. Once the data has
undergone with QA/QC check by the analyst it is made final and available to the scientific
community for use. This data is then sent to the DNR field office where a CBM NERR technician
(John Zimmerelli) conforms this data into the correct NERR format and variable comment codes.
This data is run through a final QA/QC check verifying missing data and calculated values, and
an explanation for these data points is provided. PROCESS DATE: 20060223
Access Constraints
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 LIABILITY: Distribution NOAA/ERD retains
the ... right to 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 from the Research Coordinator at the individual NERR
site (please see Section 1. Principal 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, Microsoft Excel
spreadsheet format and comma-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
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
Contact Address:
Department of Natural Resources
City:
Annapolis
Province or State:
MD
Postal Code:
21401
Country:
USA
Creation and Review Dates
DIF Creation Date:
2006-02-23
Last DIF Revision Date:
2009-06-02
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