Building an Integrated Ocean Color Sensor Web at the Land-Sea Interface UCSC UARC/ARC Ames GSFC BSI SARP

1. The primary geophysical data product(s) they are responsible for, e.g., the normalized water-leaving radiance, denoted here as [Lw]n. 2. The governing equation to produce the geophysical data product(s), e.g., [Lw]n = Fo*[0.54*Lu(0-)/Es]. 3. The measurements used to produce the primary data product(s), e.g., Lu, Ed, and Es (or Li, Lt, and Es). 4. The corrections applied to the measurements, e.g., self-shading, bidirectionality, Earth-Sun distance, etc. 5. Objective constraints applied during the data processing scheme, e.g., tilt filtering, Es normalization, Es convergence, etc. 6. Subjective constraints applied during the data processing scheme, e.g., determination of an extrapolation interval, etc. 7. The laboratory characterizations of the instruments, e.g., NIST-traceable calibration, immersion factor, stray light, etc. 8. The field characterizations of the instruments, e.g., dark currents, pressure tares, etc. 9. The uncertainty in the data product under the usual data sampling conditions, e.g., clear sky. 10. The publication(s) that document the protocols for laboratory characterizations, data acquisition, data processing, etc.

HOBI Labs HS-6 Backscatter meter with fluorescence at 2 wavelengths ~100 m depth rating, descent rate ~ 0.5 m/s 420, 442, 470, 510, 590, 700 nm, plus 532, 700 nm 140 degree angle Adjustable sampling rate, usually set at 1-4 Hz 1)Primary geophysical parameters: spectral backscatter 2)Primary Products: same 3)Derived Products: Junge-slope, VSF, with ac-s can get b b /b (necessary for selecting Fournier-Forand VSF in HydroLight)

HOBI Labs HS-6 Corrections: – Calibration with Spectralon plate – Sigma-correction Default correction designed for Case I water Need absorption, chlorophyll to create specific correction – Data binned to depth (typically 0.5 m) – Generally use down-cast only

HOBI Labs HS-6 Objective Constraints: – Sigma Correction – Does not require ambient light Subjective Constraints: – Binning intervals – Comparison of data with “expected” values

HOBI Labs HS-6 Lab Characterization – Vendor calibration/maintenance as needed – We have our own calibration tank Field Characterization – Basically, is it on or not – Capable of burst sampling (but we don’t usually use that)

HOBI Labs HS-6 Uncertainty – Assumption that 140° is representative – Sigma-correction can be considerable in Case 2 Publications – Manuals from HOBI Labs – Many (many) peer-reviewed publications – We generally follow the protocols developed by NRL