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Lecture 19 : Linking in situ IOP with biogeochemistry, case studies (multi-instructor presentation and discussion). Concept of optical proxies. Proxies itunes. Variable interacts with light Volts or Counts IOP or AOP Proxy Variable –> real thing ( = phytoplankton, etc.).

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Lecture 19: Linking in situ IOP with biogeochemistry, case studies (multi-instructor presentation and discussion)

Concept of optical proxies


Proxies itunes
Proxiesitunes


Optical properties as proxies

Variable interacts with light

Volts or Counts

IOP or AOP

Proxy

Variable –> real thing

( = phytoplankton, etc.)

Optical Properties as Proxies


There s two ways to skin a cat
“There’s two ways to skin a cat”

Variable IOP or AOP

How to measure the variable (combination of proxies?)

POC

Phytoplankton

Dead organics

Suspended minerals

Biogenic minerals (coccoliths)

DOC

What information does the IOP/AOP contain (multiple variables)?

a

b

c

bb

VSF

K

Rrs


Variable: phytoplankton biomass – pigment (long history: HPPU, CPR, trichromatic equ., fluorescence, HPLC, remote sensing

absorption coefficientdirect IOP or inversion from AOPs: but – phytoplankton is only part of total aphyt, all pigments aps photosynthetically competent pigments fluorescencequasi-IOP or AOP (solar fluorescence)caution because of variable fdetermine pigment, then what? Convert to carbon? Use for physiology or PP model?


Variable: phytoplankton biomass – carbonIOPs: c – phytoplankton is only part b – phytoplankton is only part bb – phytoplankton is only part AOPs: bb – phytoplankton is only part Can bb/b or bb/c ratio help to better resolve if c, b or bb is dominated by organics ?


Variable: phytoplankton functional grouping eg: SIZE or TAXONIOP: spectrum beam c – mean particle size VSF – particle size distributionAOP: inversion spectrum bb – mean particle size-dependence of a – pigment packaging –> pico vs. microplankton; key groups


Ancillary data to guide interpretation/model/etc.* temperature – algal growth rate, carbon flux, nutrient effects, etc.* salinity – terrestrial CDOM, stratification * winds – mixing, storms* depth – MLD, euphotic depth, water column depth* geographic regime and distance from shore* what else?


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