The P/ACE Advantage• Plankton Size/Functional Type/Community Structure– Direct link to BGC models, biomass/rate partitioning, – Use hyperspectral observations of Rrs(λ) (incl. near-UV)

• Advanced Atmosphere Correction– Absorbing aerosols (a HUGE problem in the coastal ocean!!)– Use 345 nm as dark pixel bridging aerosol corrections to the NIR

• CDOM Separation– CDOM is the dominant optical property affecting ocean color

and it contaminates ecosystem/BGC retrievals– Bands at 360 and 380 nm will allow robust CDOM retrievals

• Chlorophyll Fluorescence– Physiological health using fluorescence emission spectra

Essential OPCC Variables (1)

• PFT/PSD (biomass partitioning, size, function, …)

– HPLC analyses, cell counts, flow cyto/cams, etc.• NPP (biomass partitioned)

– 14C/13C, GPP-RA, μPhytoC, etc.

• NCP (export potential)

– ΔO2/Ar, PS vs. RT, Δ(something)/Δt, gas tension, new production (15N), NPP-RH, etc.

• Export & Flux Attenuation– Sediment traps, radioisotopes (234Th), AOUR, mass

balances, camera, PFTs, pumps, etc.

Essential OPCC Variables (2)

• Surface pCO2 and pH – Rik/Steve/Joe– Direct observation

• Air-Sea CO2 and O2 fluxes – Joe/– ΔpCO2/ΔO2 + wind + solubility model,

atmosphere/ocean inversions• Calcification – 14C (microdiffusion), ΔPIC/Δt, ΔTAlk/ΔDIC,

• N2 fixation– 15N2 incorporation, acetylene reduciton, Zehr…

Assumptions

• Supporting measurements / modling infrastructure– MLD, SST, winds, SSH, salinity, horizontal currents,

model assessment of vertical water mass exchanges in the upper 500 m, etc.

– Need Physical/BGC assimilative capabilities to use ACE obs to get at OPCC essential variables

– Need to push the physicists to get what we need (OCB Clivar)

Field / Modeling Studies Needed to Develop Robust “Paths”

• Intercomparison of NPP, NCP, GPP, export, Ri, etc. rate measurements and in a Lagrangian frame assessing DelSomething/DtQ = How is the biological pump changing?Q = What are the interactions among GPP, NPP, NCP and export across a diversity of time evolving ecosystems?– ACE mission support– Interagency Carbon Cycle Working Group…

• PFT intercomparison exercise– HPLC, cell counts, cameras, spectroscopy, backscatter, – Provide PFTs in form to be used by modelers

• System simulation experiments – comparing sateliite/in situ data uncertainties propagate to OPCC variables

• Long line process observation of appropriate variables– Clivar, AMT and other opportunities

• Airborne Lidar intercomparison work