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Elkhorn Slough Water quality Programs Trends and Concerns
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ESNERR WQ Monitoring Program-Volunteer SitesSample Monthly 1989 – Present
Params by Probe (DO,Temp,Sal,pH,Turb, Chl) & Nutrients (Nitrate, Phosphate Ammoinium)
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ESNERR WQ Monitoring Program-NERR SitesSample every 15 mins; 1995 (AP & SM) – Present
Params by probe (Depth, DO,Temp,Sal,pH,Turb) & Monthly Nutrients (Nitrate, Phosphate Ammoinium)
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Even the mouth of the Estuary goes below the 5 mg/L target
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As we move up the slough DO gets worse and worse
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Azevedo Pond below 5 mg/L almost year round, hypoxic <2.3 mg/L summer and fall
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Nutrient pollution varies by region
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Salinas River sites Annual Average 2002-2009
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Nitrate concentrations mg NOx/LComparison of means of all available data by Reserve and Station, 2006–2011
OWC takes the prize highest average nitrate NERR range .02 – 2.7 mg/L
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Nitrate concentrations mg NOx/LComparison of means of all available data by Reserve and Station, 2006–2011
Salinas River Sites Average 22 mg/L 10X higher than Highest NERR site in Country
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Chl by tidal exchange in the EstuaryLow Moderate High Hyper
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EUTROPHICATION: anoxic sedimentA much narrower layer at the top of the mud is well oxygenated at muted vs. full tidal sites
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EUTROPHICATION: dissolved oxygenGreater variation with less tidal exchange
a
b
b
a
b
b
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Nitrate
0
100
200
300
400
500
600
700
800
900
70 72 74 76 78 80 82 84 86 88 90 92 94 96 98
µM
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0.001 0.01 0.1 1 10
JOBRKBGTMSAPGNDNARACENIW
WQBNOCKACELKGRBJACCBVSOSTJR
SFBAPAWKBCBMHUDPDBDEL
WELOWC
mg NOx L-1
How different are the NERR sites?
http://nerrs.noaa.gov
Comparison of means of all available data by Reserve and Station, 2002 – 2006/7
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Annual Hypoxia from two NERR stations
AVIRIS photo, John Ryan, MBARI
Azevedo Pond
South Marsh
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Data from Ken Johnson 2010
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0
10
20
30
40
50
60
70
80
0 0.5 1 1.5 2 2.5 3 3.5
% T
ime
Hyp
oxic
(<
28%
Sat
urat
ed D
O)
Maximum Tidal Range (m)
Bennett Slough 1
Bennett Slough 2Moss Landing Harbor
Moro Cojo Slough
Elkhorn Slough 1
Elkhorn Slough 2
ES5ES4ES3
ES @ Kirby
Figure 5. Maximum tidal exchange v. % time hypoxic
Tidal range vs % time hypoxic
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How different are the NERR sites?
http://nerrs.noaa.gov
Comparison of means of all available data by Reserve and Station, 2002 – 2006/7
g Chl a L-1
NARKACJOBSOSJAC
GTMRKBHUDNOCPDBGRBGNDSFBNIWSAPAPAELKTJR
CBVMARACE
WQBDEL
OWCCBMWKBWEL
0.1 1.0 10 100
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Summary take home messages