Heat, Nitrate, and Other Fluxes in BIOSOPE Marlon R. Lewis Dalhousie University & Satlantic Inc.
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Transcript of Heat, Nitrate, and Other Fluxes in BIOSOPE Marlon R. Lewis Dalhousie University & Satlantic Inc.
Heat, Nitrate, and Other Fluxes in BIOSOPE
Marlon R. LewisDalhousie University &
Satlantic Inc.
Halifax, Canada
,)( Nwezez PNy
Nv
x
NuD
t
ND
),()( COwezez PCCy
Cv
x
CuD
t
CD
),()( pwopezezp QQQy
Tv
x
TuCD
t
TDC
Heat CarbonNitrate
Biological
uptake
Vertical flux
“Sinking”
Biological
uptake
Vertical flux
Euphoticzone
Air-sea flux
Absorptionof solar
radiation
Net surfaceHeat flux
PenetrativeIrradiance
Horizontal fluxes
Vertical flux
N2?
Interesting comparison of Marquises, gyre (N, S), upwelling
Objectives: Estimation of Heat, Nitrate, Carbon (others) fluxes in SPG.
Free-fall hyperspectral downwelling irradiance, upwelling radiance.Includes fluorometer, 2 backscatter, CTD, surface hyperspectral Ed.Also need meteorology, ADCP (?).Net flux at base by difference.+ Floats, altimetry, scatterometry
Heat Fluxes – Surface & Subsurface
@0.2 m/s, ~ 30 min. for profileIf time available, can do surface Lu, Eu (z ~10-20 cm)
),()( pwopezezp QQQy
Tv
x
TuCD
t
TDC
Absorptionof solar
radiation
Net surfaceHeat flux
PenetrativeIrradiance
Horizontal fluxes
Vertical flux
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Surface Mode
Profile Mode
Nitrate Fluxes (I do not need any water!)
200 .00 240 .00 280 .00 320 .00Wavelength (nm )
0 .000
0 .020
0 .040
0 .060
Sp
ecif
ic M
olar
Ab
sorp
tion
(R
elat
ive
Sca
le)
1 .00
2 .00
3 .00
Who
le w
ater
ab
sorb
ance
Whole water
Bromide ------
Nitrate
Probe Anti-Biofouling Cover
Computer System
UV Light SourceUV Spectrograph
User Interfaces
Retro-Probe Optics
ISUS Nitrate sensor on CTDResolve N(z) at < 0.5 mCompute dN/dT, and estimate nitrate fluxes from vertical heat fluxes.
0-1.2 M 0-40 M
Calibration
May try new 4 cm pathlength cell for BIOSOPE to (maybe) improve limits of detection.
Open Ocean – Equatorial Pacific
ISUS001 nitrates from 4400km transect in EqPac on R/V Mirai MR02K06 – Feb 200318 profiles to 300m, 10,000 real time nitrate measurements
Atlantic, Gambian Plain, March/April, 2003 O2
NO3-
Similar approach can be taken with C, P, Si, Fe, others. Need e.g. TCO2(z), Fe (z), pCO2, etc.
Issues/Questions:•Data policy/access (for me, open to all)?•Responsible persons for meteorology, ADCP, CTD?•Underway profiling?•Interested people for C, Fe, others?•Container shipping/lash down?•PROVOR/APEX Floats w/radiometer (?)•Berth for Tech/Eng.?