Hawaii Ocean Time-series (HOT)
in the School of Ocean and Earth Science and Technology at the University of Hawai'i at Manoa
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Parameters Measured


Parameter Depth Range (m) Analytical Procedure
1. Continuous Measurments
Depth (Pressure) 0-4750 Pressure transducer on Sea-Bird CTD package
Temperature 0-4750 Thermistor on Sea-Bird CTD package
Conductivity (Salinity) 0-4750 Conductivity sensor on Sea-Bird CTD package, with discrete salinity samples calibration
Dissolved Oxygen 0-4750 Sea-Bird sensor on Sea-Bird CTD package with discrete oxygen samples calibration
Fluorescence (Chloropigment) 0-4750 Sea-Point chlorophyll fluorometer on Sea-Bird CTD package with discrete chlorophyll samples calibration
2. Optical Measurments
Incident Irradiance (PAR) Surface LI-COR LI-1500 and Satlantic HyperOCR Hyperspectral Radiometer
Upwelling Radiance and Downwelling Irradiance 0-200 Satlantic Profiler II with HyperOCR Hyperspectral Radiometers & WET Labs ECO-BB2F Triplet
Particle Size Analysis 0-200 Sequoia Laser In-Situ Scattering & Transmissometry (LISST-100X)
3. Water Column Chemical Measurements
Salinity 0-4750 Guildline AutoSal using Wormley seawater standard
Oxygen 0-4750 Winkler Titration
Dissolved Inorganic Carbon 0-4750 Coulometry standardized using CRMs provided by A. Dickson (SIO)
Total Alkalinity 0-4750 Automated Gran Titration
pH 0-4750 Spectrophotometric
Nitrate Plus Nitrite 0-4750 Autoanalyzer standardized using KANSO CRMs
Soluable Reactive Phosphorus (SRP) 0-4750 Autoanalyzer standardized using KANSO CRMs
Silicate 0-4750 Autoanalyzer standardized using KANSO CRMs
Low Level [Nitrate + Nitrite] 0-200 Chemiluminescence
Low-Level SRP 0-200 Magnesium-induced Coprecipitation
Dissolved Organic Carbon 0-4750 High Temperature Catalytic Oxidation
Dissolved Organic Nitrogen 0-1000 U.V. oxidation of total nitrogen
Dissolved Organic Phosphorus 0-1000 U.V. oxidation of total phosphorus
Particulate Carbon 0-350 High Temperature Combustion
Particulate Nitrogen 0-350 High Temperature Combustion
Particulate Phosphorus 0-350 High Temperature Combustion
Particulate Biogenic Silica 0-175 Base Hydrolysis
4. Biomass Measurments
Chlorophyll a & Pheopigments 0-175 Fluorometric Analysis using the acid method
Pigments 0-175 High Performance Liquid Chromatography (HPLC)
Adenosine 5'-Triphosphate 0-350 Firefly Bioluminescence
Bacteria and Cyanobacteria 0-175 Flow Cytometry
Mesozooplankton 0-175 Net tows, elemental analysis
5. Carbon Assimilation and Particle Flux
Primary Production 5-125 14C-bicarbonate in situ Incubations
Carbon, Nitrogen, Phosphorus & Silica Flux 150 Free-Floating Particle Interceptor Traps
6. Currents
Acoustic Doppler Current Profiler 10-1200 Hull Mounted, RDI #OS-38
Acoustic Doppler Current Profiler 10-100 Hull Mounted, RDI #WH-300
7. Bow Intake System
Temperature 3 Sea-Bird remote temperature sensor
Conductivity (Salinity) 3 Sea-Bird temperature & conductivity sensors inside the thermosalinograph package, with discrete salinity samples calibration
Fluorescence (Chloropigment) 3 In vivo fluorometry
8. Moored Instruments
Sequencing Sediment Traps (Particle Flux) 2800, 4000 Parflux MK7-21
Physical Oceanographic Mooring 0-155 WHOTS