2nd Reminder: Midterm 1 is  this Friday  February 1st
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2nd Reminder: Midterm 1 is this Friday February 1st. Extended office hours today Wednesday 10AM-NOON. Midterm 1 is 15% of your final grade It covers all lectures through Monday January 28th It covers ALL reading assigned for weeks 1-4 , including topics not covered in class

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2nd Reminder: Midterm 1 is this Friday February 1st

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2nd reminder midterm 1 is this friday february 1st

2nd Reminder: Midterm 1 is this Friday February 1st

Extended office hours today

Wednesday 10AM-NOON

  • Midterm 1 is 15% of your final grade

  • It covers all lectures through Monday January 28th

  • It covers ALL reading assigned for weeks 1-4 , including topics not covered in class

    Lecture related material is emphasized but general reading is covered generally (optional study aids are available on website for early reading assignments)

  • It will be short answer comprehensive based upon understanding of content, not problem solving.

  • Expect you to know

  • Fundamental properties of seawater, major currents, light

  • Chemotaxonomic pigments

  • General properties of different phytoplankton groups

  • Photosynthesis

  • Primary production methods, formula and nomenclature

    e. g. Spectral estimates of PP, P-I curves and names/symbols of parts

    e. g. Qpar, Qpar (l), Pmax, Ik, aph(l),, alpha, beta, etc.

    f) Generalities about major case studies discussed in readings: spring blooms in lakes, along coasts, and over the N. Atlantic


2nd reminder midterm 1 is this friday february 1st

General Current patterns of the Southern California Bight

SBC resides in northern portion of the Southern California Bight (not Bite) below Pt. Conception

California Current (CC):cool (15C), nutrient rich, flows south along the outer edge of the Continental Shelf (1000 m).

Southern California CounterCurrent (SCCC):warmer, lower nutrient waters that turns from a southerly flow off shore to a northerly flow over the Continental Shelf until encountering the SBC which block much of the flow and divert it seward to mix again with the CC.

Episodic upwelling north of Pt. Conception brings very cold (13C<), nutrient rich water from deep waters to surface, which mixes with the CC waterforming sharpfrontal boundariesas it encounters the SCCC. Upwelling is the primary source of nutrients derived from the ocean near the coast of central California

Subtropical oligotrophic waters flow northalong the coast in summer months, more so in El Nino years. Very warm(>20 C), oligotrophic waters in relatively shallow surface current.

The current dynamics of the SBC region generate marked gradients in the physical, chemical, biological and optical properties of the upper water column (0 to 160 m) are observed across the SBC coastal region.

SST


2nd reminder midterm 1 is this friday february 1st

West-East Transect Line, showing 12 stations where vertical profiling of physical, optical, chemical and biological properties were made.

Hydrographic conditions change between repeated transects at weekly intervals, e.g.

During strong upwelling

No upwelling

Working between dawn and dusk of a single day, transect stations can sampled across the cold-front-warm boundaries along the outer side of the SBC.


2nd reminder midterm 1 is this friday february 1st

The abundance, composition and photosynthetic capabilities of phytoplankton communities vary widely across the frontal boundaries in SBC region

SST = sea surface temperature

Surface Pmax/vol

warm

cold

FRONTAL BOUNDARY

Surface Chl /vol

cold

warm

SeaWifs Chl map

Surface water temperature, SST


2nd reminder midterm 1 is this friday february 1st

Highly variable waters of the SBC region create a diverse spatial gradients in hydrographic properties

TEMP

CHL

BIOMASS

PROFILE

Nutrient-limitation

downwelling

Subtropical oligotrophic

Uniform mixing

MIXED LAYER DEPTH

DEPTH OF EUPHOTIC ZONE

TEMP

PROFILE


2nd reminder midterm 1 is this friday february 1st

HIGH BIOMASS

DOMINATED BY

LARGE DIATOMS FOLLOWING UPWELLING

MODERATE BIOMASS

DOMINATED BY

MIXED COMMUNITY OF DIATOMS AND MICROFLAGELLATES

LOW BIOMASS;FEW SMALL DIATOMS; COMMUNITY DOMINATED BY SMALL

MICROFLAGELLATES & PICO SIZE ‘RED’ CYANOBACTERIA

Note differences in pigment concentration range for cold, front, warm waters


2nd reminder midterm 1 is this friday february 1st

Chl-specific Pmax = photosynthetic potential

c

w

P

f

Chl-specific alpha ~ relative quantum yield

QPAR

Chl-specific P = (Pmax )(tanh I/Ik)

f

w

c


2nd reminder midterm 1 is this friday february 1st

upwelling

Chl biomass

California Current

Cold, nutrient rich

Diatom-dominated

microplankton

Frontal baundary

Upwelling event at west end of SBC

before upwelling at west end of SBC


2nd reminder midterm 1 is this friday february 1st

Net phytoplankton feed the linear food via larger zooplankton

Nano- and pico-phytoplankton feed the microbial loop

Comment on phytoplankton size and food chain dynamics


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