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Physical Oceanography and Modeling Capabilities. Cisco Werner UNC-Chapel Hill cisco@unc.edu. Eel workshop Blacksburg, 23 March 2005. Eel Life Cycle (as understood by a physical ocean modeler).

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physical oceanography and modeling capabilities

Physical Oceanography and Modeling Capabilities

Cisco Werner

UNC-Chapel Hill

cisco@unc.edu

Eel workshop Blacksburg, 23 March 2005

eel life cycle as understood by a physical ocean modeler
Eel Life Cycle (as understood by a physical ocean modeler)
  • The eel begins and ends its life in the waters of the Sargasso Sea, an area north of the Bahamas.
  • The leptocephalus, a pelagic larvae of less than two inches in length, drifts with the ocean currents for 9 to 12 months before entering coastal waters.
  • When it reaches approximately 2.4 inches (6 cm) in length, the leptocephalus metamorphoses into a transparent, "glass" eel.
  • In autumn the glass eels migrate into estuaries along the Atlantic coast where they become pigmented. These eels are known as elvers.
  • Some elvers remain in the estuaries, but others migrate varying distances upstream, often for several hundred kilometers.

http://www.chesapeakebay.net/american_eel.htm

slide5

In the mid-1980s (in Europe), the number of new glass eels entering rivers declined to 10% of former levels and recent figures show that this has now dropped to 1%. The crash happened over the whole European continent with no single, obvious cause. Suggestions for possible causes have included over-exploitation, inland habitat loss, climate and ocean current change, disease and pollution.

http://www.ices.dk/marineworld/eel.asp

slide7

10 year trajectories

Fixed depth (no vertical displacement)

10 year trajectories

Passive trajectories (free vertical motion)

slide8
Eddy-driven sources and sinks of nutrients in the upper ocean:results of a 0.1° resolution model of the North Atlantic

McGillicuddy, D.J., Anderson, L.A., Doney, S.C. and M.E. Maltrud

National Science Foundation

NCAR: Scientific Computing Division

an eddy resolving nutrient transport model
An eddy-resolving nutrient transport model

Euphotic Zone: NP=NP(I,NO3,T)

Aphotic Zone: Relaxation to clim.

NO3(σT)

annual new production term balances
Annual New ProductionTerm Balances

New Prod Conv + Diff

Vertical

advection

Horizontal

advection

Total Mean Eddy

new production at bats three models three different nutrient transport pathways
New Production at BATS:Three Models, Three Different Nutrient Transport Pathways

Observed Annual New Production = 0.5 mol N m-2 yr-1

coarse 1 6 eddy resolving 0 1
Coarse (1.6º) Eddy-resolving (0.1º)

Sea Surface

Temperature

log (New

Production)

slide16

1

2

4

3

5

6

Nested Grids in the Northwest Atlantic using ROMS

  • 1) NENA
  • 2) NEOS
  • 3) CBLAST4) LATTE
  • 5) NY/NJ Bight
  • 6) Caribbean
  • 7) Not shown:
    • Delaware Bay
    • Narragansett Bay
    • Chesapeake Bay
    • North Atlantic Basin
slide17

Northeast North Atlantic (NENA) embedded within NATL

3-day average open boundary values from NATL7-component NPZD ecosystem

Temperature

Chlorophyll

slide21

Residual flow field

under average wind

conditions

October

January

March

Wind Direction

slide27

Arrival at slack before ebb

Arrival at slack before flood

slide28

Long-term changes in the ecology (hydro-climate + biology) of the North Sea

(Beaugrand, in press PO)

slide30

Long-term changes in the abundance

of two key species in the North Sea

Percentage of

C. helgolandicus

(Beaugrand)

slide31

Long-term changes in the abundance

of two key species in the North Sea

Calanus finmarchicus

Calanus helgolandicus

12

12

1.6

1

11

11

1.4

0.9

10

10

0.8

1.2

9

9

0.7

8

8

1

0.6

7

7

months

0.8

0.5

6

6

0.4

5

0.6

5

0.3

4

4

0.4

0.2

3

3

0.2

2

0.1

2

1

1

60

65

70

75

80

85

90

95

60

65

70

75

80

85

90

95

Years (1958-1999)

Years (1958-1999)

(Beaugrand)

relevant programs
Relevant Programs
  • GODAE – Global Ocean Data Assimilation Experiment (NASA)
  • CLIVAR – Climate Variability
  • OOI – Ocean Observatories Initiative (NSF)
  • GOOS – Global Ocean Observing System
  • IOOS – Integrated Ocean Observing System (NOAA)
slide33

Will follow

IOOS model of

overlapping

regional systems

that together

form a national

system

sea coos

SEA-COOS

The Southeast Atlantic Coastal Ocean Observing System

fisheries observation network

NC

1 Site

SC

2 Sites

GA

2000 m

2 Sites

200 m

Fisheries Management ObservationsC. Barans, SCDNR

Fisheries Observation Network

Ecosystem Based Fisheries Management

  • Cyclic movements
  • Interactions
  • Spawning times
  • Recruitment

High Temporal Resolution:

Microwave Transmission System

  • Near real-time data

Autonomous Video Loggers

  • Regional coverage
  • Latitudinal/ depth
slide39

System example: “FishCam”

  • C. Barans, SC DNR
  • video clips from 6-camera system
  • hourly images
  • telemetry via SABSOON
  • microwave/T1 communications

Images from current day:

www.skio.peachnet.edu/research/sabsoon

/fishwatch/

Searchable video archive:

http://oceanica.cofc.edu/FishWatch/open.htm

Included are a Searchable Data Base and an Educational Web Site