Physical Properties and Forcings in an Estuarine System 2013 PICES Summer School Group 4 Matthew,...
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Transcript of Physical Properties and Forcings in an Estuarine System 2013 PICES Summer School Group 4 Matthew,...
Physical Properties and Physical Properties and Forcings in an Estuarine Forcings in an Estuarine
SystemSystem
2013 PICES Summer School2013 PICES Summer SchoolGroup 4Group 4
Matthew, Daniel, Jingsong, Matthew, Daniel, Jingsong, Chorong, Joocheul, Morgaine, Chorong, Joocheul, Morgaine,
Polina, AmyPolina, Amy
Topic: Physical Topic: Physical OceanographyOceanography
Question:Question:
Describe the time dependence in Describe the time dependence in physical properties (temperature, physical properties (temperature, salinity, dissolved oxygen) and salinity, dissolved oxygen) and explain what forces these.explain what forces these.
Yaquina Bay: 2 Sites, 1.5 Yaquina Bay: 2 Sites, 1.5 DaysDays
Mooring w/ CTD
CTD casts
MooringMooring
Winds – upwelling favorableWinds – upwelling favorable
Y14 Sample TimesY14 Sample Times
(m)
Aug. 20 Aug. 21
Δh = 5cm
Δh = 46cm
Y14Y14
TrendsTrends
Day 1: Day 1: – well-mixed throughoutwell-mixed throughout
Day 2: Day 2: – well-mixed below 3mwell-mixed below 3m– lower T, higher S, lower DO (rel. to day lower T, higher S, lower DO (rel. to day
1)1)
No apparent tidal influence in CTD No apparent tidal influence in CTD cast data at Y14 stationcast data at Y14 station– sampling on opposite sides of tidal peak sampling on opposite sides of tidal peak
(not at extremes)(not at extremes)– Day 2: 2Day 2: 2ndnd sample in the slack tide sample in the slack tide
HypothesesHypotheses
1: Well-mixed water column due to 1: Well-mixed water column due to low summertime river flow relative to low summertime river flow relative to tide flow.tide flow.
2: Day 2 had more upwelled ocean 2: Day 2 had more upwelled ocean water at Y14.water at Y14.– stronger tide, wind from the Nstronger tide, wind from the N– T decreased, S increased, DO decreasedT decreased, S increased, DO decreased
Vertical velocity differencesVertical velocity differencesare smallare small
Potential issuesPotential issues
Non-verticality of castNon-verticality of cast– drift of boat during samplingdrift of boat during sampling– strong currents strong currents CTD line angled CTD line angled
Non-shared datumNon-shared datum– depth relative to surfacedepth relative to surface– up to 0.5m change in depth (flood vs. up to 0.5m change in depth (flood vs.
ebb)ebb)
ConclusionsConclusions
Upwelled water is identifiable at both Upwelled water is identifiable at both stations on Day 2stations on Day 2
River water is not a strong influence: River water is not a strong influence: low flow rates low flow rates strong mixing strong mixing well-mixed water column (no salt well-mixed water column (no salt wedge) wedge)
CTD sampling must be better spaced CTD sampling must be better spaced along tidal cycle to make conclusions along tidal cycle to make conclusions about effects of the tide with only about effects of the tide with only discrete samplingdiscrete sampling
Thank youThank you
GRACIAS!!!!GRACIAS!!!! GAMSAHAMNIDA!!!!GAMSAHAMNIDA!!!! ARIGATOU!!!!ARIGATOU!!!! DANKE SCHOEN!!!!DANKE SCHOEN!!!! CHEERS MATES!!!CHEERS MATES!!! SHYE SHYE!SHYE SHYE! SPACIBO!!!SPACIBO!!!
Backup SlidesBackup Slides
Day 1: Flood tideDay 1: Flood tide
Day 1: Ebb tideDay 1: Ebb tide
Day 2: Flood tideDay 2: Flood tide
Day 2: Ebb tideDay 2: Ebb tide
Tidal cycles in flow-through Tidal cycles in flow-through
Temperature decrease & salinity Temperature decrease & salinity increase as flood tide comes inincrease as flood tide comes in
Temperature & salinity relatively Temperature & salinity relatively constant for samples around max constant for samples around max tide pointtide point
Group1Group1
Group2
Group3