1 / 8

Concept of optical proxies

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.).

chapa
Télécharger la présentation

Concept of optical proxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Lecture 19: Linking in situ IOP with biogeochemistry, case studies (multi-instructor presentation and discussion) Concept of optical proxies

  2. Proxiesitunes

  3. Variable interacts with light Volts or Counts IOP or AOP Proxy Variable –> real thing ( = phytoplankton, etc.) Optical Properties as Proxies

  4. “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

  5. 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?

  6. 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 ?

  7. 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

  8. 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?

More Related