Instruments List

The FSG has several optical instruments from leading manufacturers to measure inherent and apparent optical properties (IOPs and AOPs). AOP instruments are generally deployed in free-fall packages, while IOP instruments are deployed in profiling cages or plumbed into the ship's clean seawater system for underway measurements.

IOP instrumentation:

• WET-Labs ac-s (2) . Measures absorption (a) and attenuation (c) at approximately 80 wavelengths between 400 and 750 nm.
• WET-Labs ac-9. Measures absorption (a) and attenuation (c) at 9 wavelengths.
• WET-Labs bb-9 . Measures backscatter (b_b) at one angle, nine wavelengths.
• WET-Labs VSF-9 (expected by 12/2012). Measures backscatter (b_b) at 9 angles, one wavelength.
• WET-Labs CDOM fluorometer . Measures concentration of colored dissolved organic material by exciting at 370nm and measuring fluorescence at 460nm.
• WET-Labs Chlorophyll fluorometer . Measures concentration of chlorophyll-a by exciting at 470nm and measuring fluorescence at 695nm.
• WET-Labs C-star . Measures attenuation (c) at 650nm.
• HOBILABS a-sphere . Measure absorption (a) at 1500 wavelengths between 360 and 750 nm using an integrating sphere.
• HOBILABS HS-6 . Measures backscatter (b_b) at one angle, 6 wavelengths, and fluorescence at 2 wavelengths.

AOP instrumentation:

• Satlantic Profiler II . Free-fall profiler for use with radiometers. Includes Conductivity and Temperature sensors.
• Satlantic HyperOCR, set of 3 radiometers. Measures solar irradiance (E_s), downwelling or upwelling irradiance (E_d or E_u), and upwelling radiance (L_u) at 120 wavelengths from 350 to 750 nm.
• Satlantic OCR 507 , set of 2 radiometers. Measures downwelling or upwelling irradiance (E_d or E_u), and upwelling radiance (L_u) at 7 wavelengths.
• Biospherical C-Ops , set of 3 radiometers, plus free-fall package. Measures solar irradiance (E_s), downwelling or upwelling irradiance (E_d or E_u), and upwelling radiance (L_u) at 19 wavelengths.

Ancillary Instruments:

• Seabird SBE 49 (3) . Measures conductivity, temperature and pressure.
• Hobilabs Hydrodas . Power and data handler for Hobilabs instruments.
• Wetlabs DH-4 (2) . Power and data handler for Wetlabs instruments.

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