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

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
Nitrate 0-1000 Satlantic's In Situ Ultraviolet Spectrometer (ISUS) with discrete nitrate samples calibration
2. Optical Measurments
Incident Irradiance (PAR) Surface LI-COR LI-1000 and Biospherical 2 π Collector
Surface Downwelling Irradiance Surface Biospherical Surface Reference Sensor PRR-610 (discontinued)
Underwater Irradiance (PAR) 0-200 Biospherical Profiling Natural Fluorometer 4 π Collector (discontinued)
Upwelling Radiance and Downwelling Irradiance 0-200 Biospherical Profiling Reflectance Radiometer PRR-600 (discontinued)
Upwelling Radiance and Downwelling Irradiance 0-200 Satlantic Profiler II with HyperOCR Hyperspectral Radiometers & WET Labs ECO-BB2F Triplet
Upwelling Radiance and Downwelling Irradiance 0-3 Satlantic Tethered Spectral Radiometer Buoy (discontinued)
Upwelling Radiance and Downwelling Irradiance 0-3 Satlantic OCR 500 Multispectral Radiometers (discontinued)
Absorption and Beam Attenuation 0-200 WET Labs AC-9 & AC-S connected to Sea-Bird Sea-Cat package (discontinued)
Fast Repetition Rate Fluorometry 0-200 Chelsea FASTtracka Dynamic Photosynthetic Fluorometer (discontinued)
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
Total Alkalinity 0-4750 Automated Gran Titration
pH 0-4750 Spectrophotometric
Nitrate Plus Nitrite 0-4750 Autoanalyzer
Soluable Reactive Phosphorus (SRP) 0-4750 Autoanalyzer
Silicate 0-4750 Autoanalyzer
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 with Amonium Molybdate Colorimetry
4. Biomass Measurments
Chlorophyll a & Pheopigments 0-175 Fluorometric Analysis using 10-AU
Chlorophyll a, b & c 0-175 Fluorometric Analysis using TD-700 (discontinued)
Pigments 0-175 High Performance Liquid Chromatography (HPLC)
Phycoerythrin 0-175 Fluorometric Analysis using TD-700 (discontinued)
Adenosine 5'-Triphosphate 0-350 Firefly Bioluminescence
Bacteria and Cyanobacteria 0-175 Flow Cytometry
Nanoplankton and Microplankton 0-175 Epi-fluorescence Microscopy (discontinued)
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 0-150 Hull Mounted, RDI #VM-150 (discontinued)
Acoustic Doppler Current Profiler 10-1200 Hull Mounted, RDI #OS-38
Acoustic Doppler Current Profiler 10-100 Hull Mounted, RDI #WH-300
Acoustic Doppler Current Profiler 0-4750 Lowered ADCP (discontinued)
7. Instrument Towfish (discontinued)
Pressure (Depth) 45 Sensor on Sea-Bird package
Temperature 45 Thermistor on Sea-Bird package
Conductivity (Salinity) 45 Conductivity sensor on Sea-Bird package
Zooplankton 45 Optical Plankton Counter
Fluorescence 45 WetLabs SeaStar fluorometer on CTD package
8. 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
pCO2 3 Gas equilibration, infrared detection (discontinued)
Fluorescence (Chloropigment) 3 Fluorometric Analysis using 10-AU
9. Moored Instruments
Inverted Echo Sounder Network (Dynamic height) 4750 Acoustic telemetry, CTD calibration (discontinued)
Sequencing Sediment Traps (Particle Flux) 2800, 4000 Parflux MK7-21
Physical-Biogeochemical Mooring 0-1000 HALE-ALOHA (discontinued)
Physical Oceanographic Mooring 0-155 WHOTS