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

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 sample calibration
Dissolved Oxygen 0-4750 Sea-Bird sensor on Sea-Bird CTD package with discrete oxygen sample calibration
Fluorescence (Chloropigment) 0-4750 Sea-Point chlorophyll fluorometer on Sea-Bird CTD package with discrete chlorophyll sample calibration
Nitrate 0-1000 Satlantic's In Situ Ultraviolet Spectrometer (ISUS) with discrete nitrate sample 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) 0-175 Biospherical Profiling Natural Fluorometer 4 π Collector (discontinued)
Upwelling Radiance and Downwelling Irradiance 0-175 Biospherical Profiling Reflectance Radiometer PRR-600 (discontinued)
Upwelling Radiance and Downwelling Irradiance 0-175 Satlantic Hyperspectral Radiometers (HyperOCR) with 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
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 Plus 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
Mesozooplankton 0-175 Net tows, elemental analysis
5. Carbon Assimilation and Particle Flux
Primary Production 5-125 14C 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
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-Meteorological Mooring 0-155 WHOTS