Michael Behrenfeld, Emmanuel Boss, David Siegel,

1
PHYTOPLANKTON GROWTH RATES AND CARBON BIOMASS
FROM SPACE
Michael Behrenfeld, Emmanuel Boss, David Siegel,
Don Shea
References Behrenfeld, Boss, Siegel, Shea
2005. Global Biogeochem. Cycles, 19,
10.1029/2004GB002299 Winn, Campbell,
Christian, Letelier, Hebel, Dore, Fujieki,
Karl. 1995. Global Biogeochem. Cycles
9605-620. Behrenfeld, Boss. 2003. Deep Sea
Research. 501537-1549. Behrenfeld,
Prasil, Babin, Bruyant. 2004. J. Phycology.
404-25. Garver, Siegel. 1997. J. Geophys.
Res. 102 18,607-18,625.
NASA Ocean Biology and Biogeochemistry Program
2
Chlorophyll f biomass, light, nutrients,
3
ChlC physiology
3 primary factors Light Temperature
Nutrients
ChlCmax
Dunaliella tertiolecta 20 oC Replete
nutrients Exponential growth phase Geider
(1987) New Phytol. 106 1-34 16 species
Diatoms all other species Laws
Bannister (1980) Limnol. Oceanogr. 25
457-473 Thalassiosira fluviatilis NO3
limited cultures NH4 limited cultures
PO4 limited cultures
ChlC (mg mg-1)
ChlCmin
Light (moles m-2 h-1)
Laboratory
ChlCmax
Temperature (oC)
ChlCmin
Low Nutrient stress High
Growth rate (div. d-1)
4
References Behrenfeld, Boss, Siegel, Shea
2005. Global Biogeochem. Cycles, 19,
10.1029/2004GB002299
5
median r2 0.85
ChlC (mg mg-1)
ChlC (mg mg-1)
Light (moles photons m-2 h-1)
Laboratory
Space
ChlCmax
ChlCmax
References Behrenfeld, Boss, Siegel, Shea 2005.
Global Biogeochem. Cycles, 19,
10.1029/2004GB002299
Temperature (oC)
ChlCmin
ChlCmin
Growth rate (div. d-1)
Temperature (oC)
6
Growth rate (?) ?max ? f (nuts, temp) ? g
(light)
2 divisions d-1 Banse (1991)
1 exp -3light
References Behrenfeld, Boss, Siegel, Shea
2005. Global Biogeochem. Cycles, 19,
10.1029/2004GB002299
7
Oligotrophic Oceans
North Atlantic
South Atlantic
North Pacific
South Pacific
8
North Pacific HOT
References Winn, Campbell, Christian, Letelier,
Hebel, Dore, Fujieki, Karl. 1995. Global
Biogeochem. Cycles 9605-620.
1998
1999
2000
2001
2002
Year
9
North Pacific North Atlantic 14C
HOT
Measured Pbopt
Measured cpChl ratio
BATS
Sequential Observation
References Behrenfeld, Boss. 2003. Deep Sea
Research. 501537-1549.
10
Primary Production
NPP f Carbon, Zeu, ?, g (I0)
References Behrenfeld, Boss, Siegel, Shea 2005.
Global Biogeochem. Cycles, 19,
10.1029/2004GB002299
11
North Atlantic
South Atlantic
Net Primary Production (Pg C month-1)
Carbon-based estimate Chlorophyll-based
estimate (VGPM)
North Pacific
South Pacific
12
North Pacific HOT
References Winn, Campbell, Christian, Letelier,
Hebel, Dore, Fujieki, Karl. 1995. Global
Biogeochem. Cycles 9605-620.
13
DIRECTIONS
f (N,T) linear, zero intercept
Ek-independent variability PIC (e.g.,
coccoliths)cDOM vs pigment absorption (10 Pg
y-1) Particle size distributions Species-dependent
physiology New Remote Sensing.
References Behrenfeld, Prasil, Babin,
Bruyant. 2004. J. Phycology. 404-25.
14
Growth Rates, Carbon Biomass, Ecosystem Models
THURSDAY (SS26 430 pm) Patrick Schultz et al.
Investigating the balance between phytoplankton
growth and loss from space (SS25 645 pm) Andy
Jacobson et al. An inductive ocean ecology model
based on satellite observations of phytoplankton
carbon biomass.
15
BACKUP
16
(No Transcript)