location matters -...
TRANSCRIPT
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Location Matters:
Phil Bresnahan, Rusty Holleman, Zephyr Sylvester, Emily Novick, Maureen Downing-Kunz, David Senn
Oxygen Variability Across Space and Time
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Outline
Why does dissolved oxygen matter?
What are the principle drivers?
How can we untangle them?
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Why should we care?
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Drivers of variability in DOHumans
Nutrients
Plankton
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Drivers of variability in DOHumans
Nutrients
Plankton
Detritus
Oxygen
Fish
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Why should we care?
CH2O + O2 CO2 + H2O
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Why should we care?
CH2O + O2 CO2 + H2O← Photosynthesis
dominates
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Why should we care?
CH2O + O2 CO2 + H2O
Respiration →dominates
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Why should we care?The SF Bay food web depends on DO
We can directly influence DOWe need to know how much is natural vs…?
Wray Gabel, SF Bay Bird Observatory
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Wray Gabel, SF Bay Bird Observatory
Constraining variability allows us to estimate rates,slough-to-basin scale budgets, and habitat quality
and the effects of nutrient loads
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The Drivers Of Change
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Drivers of variability in DO
Interfaces: air–water
sediment–water
Production vs. Respiration:Phytoplankton/zooplankton/nekton/detritus/bacteria
Connections:ponds
marshesbay
oceanland
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Drivers of variability in DO
Lower DO
Higher DO
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Drivers of variability in DOAir–sea exchange
Water column production/respiration
Sediment oxygen demand
Lower DO
Higher DO
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Drivers of variability in DO
Lower DO
Higher DO
Air–sea exchange
Water column production/respiration
Sediment oxygen demand
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Drivers of variability in DO
Lower DO
Higher DO
Air–sea exchange
Water column production/respiration
Sediment oxygen demand
Studying the DIMENSIONS
of variability will provide critical insight
into the DRIVERS of
variability
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Disentangling Variability
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Disentangling Variability
VerticalCross-channelAlong-channel
Inter-siteTemporal
?????
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?
?
?
?
The LSB Network
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?
?
?
?
The LSB Network
Deep Subtidal Biweekly-Monthly sampling
USGS
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?
?
?
?
The LSB Network
Deep Subtidal Biweekly-Monthly sampling
USGS USGS
High-frequency measurements – Dumbarton
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Deep Subtidal Biweekly-Monthly sampling High-frequency measurements – Dumbarton
USGS USGS
The LSB NetworkVertical
Cross-channelAlong-channel
Inter-siteTemporal
????
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The LSB Network: DO (mg/L)
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The LSB Network: DO (mg/L)
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The LSB Network: DO (mg/L)
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The LSB Network: DO (mg/L)
VerticalCross-channelAlong-channel
Inter-siteTemporal
???
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
What do aquatic organisms experience in LSB habitats?
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
What do aquatic organisms experience in LSB habitats?
BETTER
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
What do aquatic organisms experience in LSB habitats?
BETTER WORSE
WORSE
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
What do aquatic organisms experience in LSB habitats?
BETTER
EVEN WORSE
WORSE
WORSE
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
What do aquatic organisms experience in LSB habitats?
BETTER
EVEN WORSE
WORSE
WORSE
Species dependent!
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
Newark Slough
08 06
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
Alviso Slough
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 2 4 8 12 24
< 1
< 2
< 3
< 4
< 5
Guadalupe Slough
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Species dependentresponses!
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Measurements in all dimensions
VerticalCross-channelAlong-channel
Inter-siteTemporal
???
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ooring location:ransect location:
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Velocity
Dissolved oxygen
Multi-probe: T, sal, DO, chlturb, depth
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Velocity
Dissolved oxygen
Multi-probe: T, sal, DO, chlturb, depth
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Temporal Vertical Variability
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Temporal Vertical Variability
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Putting it all together2016-08-27 01:00:00
75
60
45
30
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DO
conc
entr
atio
n (m
g/L)
Duration (hours)0.5 1 3 6 12 24 >24
< 1
< 2
< 3
< 4
< 5
Alviso Slough, 50 cmab
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Alviso Slough
Surface
50 cmab
5 cmab
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Preliminary ConclusionsVertical
Cross-channelAlong-channel
Inter-siteTemporal
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Preliminary Conclusions
To determine LSB biogeochemical variability, we need inter-site, vertically resolved time-series
The variability we’ve constrained allows us to estimate rates and slough-to-basin scale budgets and 4-D habitat quality
VerticalCross-channelAlong-channel
Inter-siteTemporal
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Thanks!USGS Sacramento:Kurt WeidichDarin EinhellMaureen Downing-KunzDave SchoellhamerDaniel Livsey
NMS FundingSFEI TeammatesJen Hunt, Phil Trowbridge, Ila Shimabuku, SFEI Environmental Informatics
San José-Santa Clara Regional Wastewater Facility:
Eric DunlaveyBryan Frueh
Integral Consulting and Leviathan Consulting:
Frank SpadaKara ScheuCraig Jones
Steve LaMothe
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Alviso Slough
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Velocity
Dissolved oxygen
Multi-probe: T, sal, DO, chlturb, depth
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Along-Slough: Alviso
Start (Mouth) Pond A8 End (Alviso)
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00 • • • -
• • • • • • 05 •
• • • • • • •
- 10 • • E • • - • &. -Q. Cl • 0 15
•
• 20 •
4000 .3000 2000 1000 0 Distance downlilrtam (mJ
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Vertical/Along-Slough Variability
.s a. Ql 0 1.5
2.0
2 .5 7000
0.0
0.5
1.0 § .<:! .... a. Ql 0 1.5
2.0
2.5
6000
6000
90
5000 4000 3000 2000 1000 0 Distance downstream (mJ
Mid Flood OS
8C .•
,.,
/U
li~ . . .. 5000 4000 3000 2000 1000 0
Dista nee downstream (mJ
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Vertical/Along-Slough Variability
VerticalCross-channelAlong-channel
Inter-siteTemporal
?
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What causes inter-site and temporal variability?
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What causes inter-site and temporal variability?
Newark
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Open Bay is well mixed, well aeratedMarshes and sediments (mud) are
net heterotrophic
What causes inter-site and temporal variability?
Newark
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And then there’s Alviso…
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And then there’s Alviso…Newark Alviso
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Drivers of variability in DOInterfaces:
air–watersediment–water
Production vs. Respiration:
Phytoplankton/zooplankton/ nekton/detritus/bacteria
Connections:ponds
marshesbay
oceanland
Dimensions
VerticalLateral (cross-channel)
Longitudinal (along channel)
TemporalInter-site
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VerticalLateral (cross-channel)
Longitudinal (along channel)
TemporalInter-site
Interfaces: air–water
sediment–water
Production vs. Respiration:
Phytoplankton/zooplankton/ nekton/detritus/bacteria
Connections:ponds
marshesbay
oceanland
IT’S COMPLICATED
Drivers of variability in DODimensions
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We then passed this data through some existing suggested criteria from other regions (knowing that the indicator species may not be most appropriate for SFB):
--EPA (2000): for Virginia Province
--Sutula (2012): all of CA, except SFB
--Bailey (2014): Suisun Marsh, in SFB
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Guadalupe
Would violate EPA (2000) criteria for short-term exposures (>24 hrs)
Would violate Sutula(2012) and Bailey (2014) juvenile/adult survivialcriteria
< 1
< 2
< 3
< 4
< 5
Duration (h )
Would violate growth criteria fromEPA (2000), Sutula (2012) and Bailey and Sutula (2014)
Windows <XTotalWindows
Frequency
• > 0 0
• • ·-
08 06 OA
02 00
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San Mateo Dumbarton
Newark Mowry
Coyote Alviso
- Relevant species for Lower South Bay?
- DO chronic data for those species?
Guadalupe