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

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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.?