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Elkhorn Slough Water quality Programs Trends and Concerns. ESNERR WQ Monitoring Program-Volunteer Sites Sample Monthly 1989 – Present Params by Probe (DO,Temp,Sal,pH,Turb, Chl) & Nutrients (Nitrate, Phosphate Ammoinium).

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ESNERR WQ Monitoring Program-Volunteer SitesSample Monthly 1989 – PresentParams by Probe (DO,Temp,Sal,pH,Turb, Chl) & Nutrients (Nitrate, Phosphate Ammoinium)


ESNERR WQ Monitoring Program-NERR SitesSample every 15 mins; 1995 (AP & SM) – PresentParams by probe (Depth, DO,Temp,Sal,pH,Turb) & Monthly Nutrients (Nitrate, Phosphate Ammoinium)







Nitrate concentrations mg NOx/L mg/L summer and fall

Comparison 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


Nitrate concentrations mg NOx/L mg/L summer and fall

Comparison 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


Chl by tidal exchange in the Estuary mg/L summer and fall

Low

Moderate

High

Hyper


EUTROPHICATION: anoxic sediment mg/L summer and fall

A much narrower layer at the top of the mud is well oxygenated at muted vs. full tidal sites


EUTROPHICATION: dissolved oxygen mg/L summer and fall

Greater variation with less tidal exchange

b

b

b

b

a

a


Nitrate
Nitrate mg/L summer and fall

900

800

700

600

µM

500

400

300

200

100

0

70

72

74

76

78

80

82

84

86

88

90

92

94

96

98


How different are the NERR sites? mg/L summer and fall

Comparison of means of all available data by Reserve and Station, 2002 – 2006/7

OWC

WEL

DEL

PDB

HUD

CBM

WKB

APA

SFB

TJR

SOS

CBV

JAC

GRB

http://nerrs.noaa.gov

ELK

KAC

NOC

WQB

NIW

ACE

NAR

GND

SAP

GTM

RKB

JOB

0.001

0.01

0.1

1

10

mg NOx L-1


Annual hypoxia from two nerr stations
Annual Hypoxia from two NERR stations mg/L summer and fall

Azevedo Pond

South Marsh

AVIRIS photo, John Ryan, MBARI


Data from Ken Johnson 2010 mg/L summer and fall


Tidal range vs time hypoxic
Tidal range vs % time hypoxic mg/L summer and fall

Figure 5. Maximum tidal exchange v. % time hypoxic


How different are the NERR sites? mg/L summer and fall

WEL

WKB

CBM

OWC

DEL

WQB

ACE

MAR

CBV

TJR

ELK

APA

SAP

NIW

SFB

GND

GRB

PDB

NOC

HUD

RKB

GTM

JAC

SOS

JOB

KAC

NAR

0.1

1.0

10

100

mg Chl a L-1

Comparison of means of all available data by Reserve and Station, 2002 – 2006/7

http://nerrs.noaa.gov


Summary take home messages

Summary take home messages mg/L summer and fall


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