Inner Shelf Circulation Near Point Conception, California
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Inner Shelf Circulation Near Point Conception, California C. Cudaback, L. Washburn, E. Dever Inner-shelf circulation affects larval transport and species distributions. What drives inner-shelf circulation near Point Conception? I will discuss responses of inner-shelf:

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Inner Shelf Circulation Near Point Conception, California

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Inner shelf circulation near point conception california

  • Inner Shelf Circulation Near Point Conception, California

  • C. Cudaback, L. Washburn, E. Dever

  • Inner-shelf circulation affects larval transport and species distributions.

  • What drives inner-shelf circulation near Point Conception?

  • I will discuss responses of inner-shelf:

  • currents to seasonal flow patterns on outer shelf

  • currents to meteorologic-scale variability in winds

  • temperature to different winds and flow patterns


Inner shelf circulation near point conception california

Monterey Bay

Pt Conception

June 14, 1996 at local mid-afternoon

Temperature, Circulation and Ecology change at Pt Conception


Inner shelf circulation near point conception california

Equatorward Flow in Spring Upwelling Season


Inner shelf circulation near point conception california

Convergent Flow in Late Summer


Inner shelf circulation near point conception california

Poleward Flow in Winter


Inner shelf circulation near point conception california

35.2

35

34.8

34.6

34.4

34.2

34

33.8

-121.5

-121

-120.5

-120

-119.5

-119

data collection sites for PISCO study

Pt Sal

Purisima

Arguello

Jalama

Alegria

Ellwood

62

SIO moorings

NDBC Buoys

CODAR Stations

SAMI

23

SMIN

54

53

SMOF

ANMI


Inner shelf circulation near point conception california

35

34.8

34.6

34.4

34.2

34

33.8

-121

-120.5

-120

-119.5

-119

Conditionally-Averaged Near Surface Currents

reverse outside channel, only rotate inside

Equatorward

Convergent

Poleward


Inner shelf circulation near point conception california

Inner shelf follows similar patterns to mid-shelf

34.9

Equatorward

Convergent

Poleward

34.8

Purisima

34.7

34.6

Alegria

34.5

Ellwood

34.4

34.3

34.2

-120.8

-120.3

-119.8


Inner shelf circulation near point conception california

along shore

currents

cross shore

curents

34.9

0.2 m/s

34.85

34.8

34.75

34.7

34.65

Purisima, in upwelling zone

Along shore currents fit winds winter & spring

Cross shore currents fit winds spring only

X-shelf transport ~1/3 Ekman

34.6

34.55

34.5

-121.2

-121.1

-121

-120.9

-120.8

-120.7

-120.6

-120.5


Inner shelf circulation near point conception california

along shore

currents

cross shore

curents

34.6

0.2 m/s

34.55

34.5

34.45

Alegria, in western SB channel:

Along shore and cross shore currents fit wind only

in winter. Hints of direct wind forcing.

34.4

34.35

34.3

-120.5

-120.45

-120.4

-120.35

-120.3

-120.25

-120.2

-120.15

-120.1


Inner shelf circulation near point conception california

along shore

currents

cross shore

curents

34.5

34.48

34.46

34.44

34.42

34.4

34.38

34.36

Ellwood, in channel:

Long shore currents fit wind only in winter.

Unclear what drives circulation.

34.34

0.2 m/s

34.32

34.3

-120.05

-120

-119.95

-119.9

-119.85

-119.8

-119.75


Inner shelf circulation near point conception california

Wind Speed, Circulation State, Inner Shelf Temperature

1999

2000


Inner shelf circulation near point conception california

Winter Storms: Poleward Flow, Weak Thermal Gradient


Inner shelf circulation near point conception california

Spring Upwelling: Equatorward Flow, Cold Water in North


Inner shelf circulation near point conception california

Summer: Convergent Flow, Strong Thermal Gradient


Inner shelf circulation near point conception california

  • Large Scale Circulation Patterns:

  • Equatorward flow dominates in spring.

  • Convergent flow is common in late summer and fall.

  • Poleward flow is most common during winter storms.

  • Inner shelf currents follow same patterns, but much slower.

  • Meteorologic Scale Variability

  • Purisima: classic upwelling, transport ~ 1/3 Ekman

  • Alegria: cross-shore currents driven by local cross-shore winds

  • Ellwood: forcing uncertain

  • Inner shelf temperature responds to flow pattern.


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