The P/ACE Advantage
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The P/ACE Advantage • Plankton Size/Functional Type/Community Structure – Direct link to BGC models, biomass/rate partitioning, – Use hyperspectral observations of R rs (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
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The P/ACE Advantage. Plankton Size/Functional Type/Community Structure Direct link to BGC models, biomass/rate partitioning, Use hyperspectral observations of R rs ( λ ) (incl. near-UV) Advanced Atmosphere Correction Absorbing aerosols (a HUGE problem in the coastal ocean!!) - PowerPoint PPT Presentation
Transcript of The P/ACE Advantage
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
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