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NETCARE: B2-4c Parameterizing Climate-DMS Feedbacks Modelling the marine source and exchange at interfaces. Nadja Steiner, Institute of Ocean Sciences, DFO, Sidney & CCCma, EC Hakase Hayashida, School of Earth and Ocean Sciences, UVIC, Victoria. ASCM. SST. OSCM. Initialisation. - PowerPoint PPT Presentation
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NETCARE: B2-4c Parameterizing Climate-DMS
Feedbacks Modelling the marine source and exchange at interfaces
Nadja Steiner, Institute of Ocean Sciences, DFO, Sidney & CCCma, ECHakase Hayashida, School of Earth and Ocean Sciences, UVIC, Victoria
ASCM
OSCM
Fluxes
SST
NCEP Reanalysis/Other forcing
Initialisation
Includes:Ecosystem model: N
2P
2Z
2D,
Inorganic Carbon cycle: DIC,Alk,O2,N2, Si cycles
Marine DMS cycle
Steiner & Denman 2008
ASCM: Atmospheric Single Column Model extract from CCCma global GCMOSCM: Ocean SCM: General Ocean Turbulence Model (GOTM)
1-D Model development
Additions for NETCARE:Sea ice٭, Sea-ice algae
ecosystem with DMS Other organic aerosol sources
(surface films, bubble bursting)
DMSP and DMS cycles in the upper ocean (Gabric et al. 2002)
Boxes and processes currently represented in the model
Simulated DMS concentration (top 20m) at OSPS:N ratio, Fe limitation,S:N ratio seasonally varying to reflect the
absence of dinoflagellates in late spring
Wong et al 2004:Δ recent bottle: x MIMS:◊
2005-2006
2007-2008
Steiner et al. 2012
Steiner et al. 2012
Phytoplankton composition from pigment analysis (HPLC)
No downward trend in August!
DMSP producer
Dinoflagellates absent in June
?
DMSPd
Ni
Na
Z2(t)
DMSO+Sp
DMS
D
Z1
DMSPp
Ps
Sinking
AggregatesDetritusEntrainment
+Mixing
Photolysis
Bact. cons.
enzym. cleavage
Air-Sea/Air-Iceexchange
Pl Spl
Si
PSi
cleavage
Bact. cons.
PaDMSPpDMS
?
grazing
mortality
Photolysis, bact. conversion
Biol. conv.Sea Ice
Pelagic ecosystem
DMSPp
Fecal Pellets
University of Alberta North America Arctic (NAA) model (P. Myers): physical model only NEMO-LIM (so far => CICE) now installed with PISCES => Implement new ecosystem in coordination with CCCma - CanESM development
N3P2Z2D2, Alk, DIC, O2, N2O, DMS, sea-ice ecosystem (P, DMS)
Application in Regional Model
AB
C
Sample (20ml) is loaded into the system (A).
DMS stripped from the water using UHP nitrogen at 100 ml/min (B) and absorbed into a Tenax-TA trap held at -170°C (C).
After 10 minutes sample is desorbed onto a Chromasorb 330 column using boiling water, and elutes onto a Gas Chromatograph with a flame photometric detector.
DMS analysis: “Purge and trap”
Photolysis• Mostly parameterized as function of PAR.
• Recent data show that photolysis is mainly caused by the UV range ( e.g. Bouillon et al., 2006): UVA: 70%, UVB:30%) and varies with NO3
-
content (Bouillon and Miller 2004).
• Calculate photolysis as f(UV): Based on photolysis rates, DMS, UVA/B from SERIES we obtain: photo= cA x UVA(z) + cB x UVB(z)
(cA,B = 0.026; 2.6 d-1 (Wm-2)-1)
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