Interannual Variability in Phytoplankton Biomass and Diversity on the New England Shelf Heidi M Sosik Hui Feng In Situ Time Series for Validation and Exploration of Remote Sensing Algorithms ID: 365999
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Slide1
Seasonal to Interannual Variability in Phytoplankton Biomass and Diversity on the New England Shelf
Heidi M.
Sosik Hui Feng
In Situ Time Series for Validation and
Exploration
of
Remote Sensing Algorithms
Woods Hole
Oceanographic
Institution
University of
New HampshireSlide2
Project Overview
Goal: Use unique time series to evaluate algorithms that extend MODIS ocean color data beyond chlorophyll to functional
type or size-class-dependent phytoplankton retrievalsApproach:
End-to-end time series observations, with step-by-step algorithm evaluation and error analysis single cells phytoplankton community bulk water optical properties sea surface optical properties (air and water) MODIS optical properties
Martha’s Vineyard Coastal Observatory
Tower mounted
AERONET-OC
MODIS products
Submersible Imaging
Flow
CytometrySlide3
ApproachPhytoplankton ObservationsSingle cells to communitiesBiomass, size- and taxon-resolvedPhytoplankton AlgorithmsAbsorption spectral shape size structureDiagnostic pigments size structure
Diagnostic pigments taxonomic structureSlide4
m
mm
m
m
m
m
m
m
m
Variability in community structure
.
Diatoms
Cyano
-
bacteriaSlide5
Pigment-based retrieval of taxonomic groupsDiatoms
“CHEMTAX” Mackey et al. 1996
In situ FCM
Total Chl
a = diatom Chl a + dinoflagellate Chl a + cyanobacteria Chl a
+ …
with partitioning according to accessory pigment ratiosSlide6
Pigment-based retrieval of taxonomic groups
Diatoms
Dinoflagellates
Cyanobacteria
~1
m
m cells
10
m
mSlide7
Diagnostic pigment retrieval from RrsPan et al. 2010 band ratio algorithms
AERONET-OC
SeaPRISM
,
R
rs
(l)
Discrete samples
HPLC pigment analysis
Chl
aSlide8
Diagnostic pigment retrieval from
Rrs
Chl
aFucoxanthin
Zeaxanthin
Pan et al. 2010 band ratio algorithmsSlide9
Seasonality – pigment retrievals
D
iatom
indicator pigmentCyanobacteria
indicator pigment
Diatoms
Cyano-
bacteriaSlide10
Ecosystem characterizationTaxa with positive response to warmer wintersTaxa with negative response to warmer winters
Interannual variability – taxon specificSeasonally adjusted Biomass anomalies vs Temperature anomalies
Cyanobacterium
DiatomsSlide11
Ecosystem characterization Local detail Trends and patterns of change Regional to basin scales
Decadal increase in
pico
-cyanobacteria at MVCOSlide12
http://ifcb-data.whoi.edu/Open data accessStandard formatsProcessing pipelines End-to-end provenance