Heat, Nitrate, and Other Fluxes in BIOSOPE Marlon R. Lewis Dalhousie University & Satlantic Inc. Halifax, Canada.

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Presentation transcript:

Heat, Nitrate, and Other Fluxes in BIOSOPE Marlon R. Lewis Dalhousie University & Satlantic Inc. Halifax, Canada

Heat Carbon Nitrate Biological uptake Vertical flux “Sinking” Biological uptake Vertical flux Euphotic zone Air-sea flux Absorption of solar radiation Net surface Heat flux Penetrative Irradiance Horizontal fluxes Vertical flux N2?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 E d. Also need meteorology, ADCP (?). Net flux at base by difference. + Floats, altimetry, scatterometry Heat Fluxes – Surface & m/s, ~ 30 min. for profile If time available, can do surface L u, E u (z ~10-20 cm) Absorption of solar radiation Net surface Heat flux Penetrative Irradiance Horizontal fluxes Vertical flux ??

Surface Mode Profile Mode

Nitrate Fluxes (I do not need any water!) Whole water Bromide Nitrate Probe Anti-Biofouling Cover Computer System UV Light Source UV Spectrograph User Interfaces Retro-Probe Optics ISUS Nitrate sensor on CTD Resolve N(z) at < 0.5 m Compute 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 profiles to 300m, 10,000 real time nitrate measurements

Atlantic, Gambian Plain, March/April, 2003 O2O2 NO 3 -

Similar approach can be taken with C, P, Si, Fe, others. Need e.g. TCO 2 (z), Fe (z),  pCO 2, 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.?