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Physical and biochemical oceanographic data from the Hawaii Ocean Time-series (HOT) program collected by University of Hawaii at Station ALOHA in the Pacific Ocean 100 miles north of Oahu, Hawaii, since 1988

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: October 04, 2025 | Last Modified: 2025-09-30T00:00:00.000+00:00
This dataset includes physical and biochemical oceanographic observational data from the Hawaii Ocean Time-series (HOT) Program, including thermosalinograph, CTD, bottle and biochemical data. The HOT program makes repeated observations of the physics, biology and chemistry at a site approximately 100 km north of Oahu, Hawaii. The program began in 1988. Two stations are visited about once a month: Kahe Point (Station 1: 21.34N, 158.27W) and Station ALOHA (Station 2: 22.75N, 158W). Various other stations are made intermittently in support of similar research objectives or mooring deployments.

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0000639 0000640 0000641 0001704 0001707 0001710 0010624 0010740 0011142 0041594 0041849 0042029 0046427 0048660 0048725 0048896 0059842 0059936 0059943 0068957 0069177 0069501 0087584 0087596 0087988 0088839 0089168 0101146 0101727 0103907 0119430 0119895 0120323 0125579 0125647 0125648 0140225 0218247 0224688 0224752 0224756 0224849 0242075 0276338 0284084 0298064 0308400 9300009 9300040 9300148 9300149 9300183 9700176 9900208 9900212 9900213 9900214 9900215 AIR TEMPERATURE AIR TEMPERATURE - DRY BULB AIR TEMPERATURE - WET BULB AMMONIA (NH3) AMMONIUM (NH4) bacteria BACTERIA - HETEROTROPHIC BAROMETRIC PRESSURE BIOCHEMISTRY biological data CARBON CARBON - TOTAL ORGANIC CARBON ASSIMILATION CAROTENOIDS - PLANT CHLOROPHYLL CHLOROPHYLL - RELATIVE FLUORESCENCE CHLOROPHYLL A CHLOROPHYLL C cloud amount/frequency cloud type CONDUCTIVITY CURRENT DIRECTION CURRENT METER - EAST-WEST COMPONENT (U) CURRENT METER - NORTH-SOUTH COMPONENT (V) CURRENT SPEED CURRENT SPEED - UP/DOWN COMPONENT (W) DELTA CARBON-13 DELTA NITROGEN-15 DEPTH - OBSERVATION DEWPOINT Diadinoxanthin DISSOLVED INORGANIC CARBON (DIC) DISSOLVED ORGANIC CARBON Dissolved Organic Nitrogen DISSOLVED OXYGEN DYNAMIC DEPTH ANOMALY DYNAMIC HEIGHT Eukaryote FLUORESCENCE fucoxanthin HPLC PIGMENTS HYDROCARBONS - TOTAL RESOLVED HYDROSTATIC PRESSURE LIGHT ATTENUATION LIGHT TRANSMISSION NITRATE nitrate + nitrite content (concentration) NITRATE/NITRITE RATIO NITRITE NITROGEN NITROGEN - PARTICULATE nitrous oxide (N2O) NUTRIENTS ORGANIC CHEMICALS OXYGEN OXYGEN - DISSOLVED ORGANIC partial pressure of carbon dioxide - water Particulate Inorganic Carbon PARTICULATE ORGANIC CARBON particulate phosphorus pH PHAEOPIGMENTS phosphate PHOSPHATE - TOTAL PHOSPHORUS - ORGANIC PHOTOSYNTHETIC ACTIVE RADIATION (PAR) PHYTOPLANKTON PIGMENTS POLYCHLORINATED BIPHENYLS Potential temperature (theta) PRIMARY PRODUCTIVITY Prochlorococcus SALINITY SALINITY - SURFACE WATER SEA STATE SEA SURFACE TEMPERATURE Secchi depth SIGMA-T SIGMA-THETA silica silicate SOLAR RADIATION - ATMOSPHERIC SOUND VELOCITY surface irradiance per incubation period suspended solids Synechococcus TIDE HEIGHT TIDE STAGE total alkalinity TOTAL CARBON TOTAL PHOSPHORUS TRANSMISSIVITY turbidity UREA VISIBILITY Volatile Organic Compounds WATER COLOR WATER DENSITY water depth WATER TEMPERATURE WAVE DATA WAVE HEIGHT WAVE PERIOD WEATHER WIND DIRECTION WIND FORCE WIND SPEED ZOOPLANKTON BIOMASS bottle carbon-14 incubation CTD fluorometer inverted echo sounder (IES) laboratory analysis meteorological sensor oxygen sensor salinometer Secchi disk sediment sampler - corer sediment sampler - grab spectrophotometer thermistor thermosalinograph transmissometer trap - sediment visual analysis benthic biological chemical current measurements geological integrated profiles laboratory analyses meteorological physical profile site samples time series underway water chemistry CROMWELL FIXED PLATFORM OF UNITED STATES FIXED STATIONS OF UNITED STATES KA'IMIKAI-O-KANALOA KAHO KAIMALINO KILA MARINE VIEW MOANA WAVE NA'INA NESHANIC NEW HORIZON NOAA Ship Hi'ialakai NOAA Ship Oscar Elton Sette NOAA Ship Townsend Cromwell OCEANUS R/V KILO MOANA R/V Knorr R/V MAURICE EWING R/V Melville R/V Roger Revelle R/V THOMAS G. THOMPSON R/V WECOMA RV Alpha Helix Sikuliaq THOMSON USCGC Klamath USCGC Westwind University of Hawai'i at Mānoa University of Hawaii, Marine Laboratory University of Washington Woods Hole Oceanographic Institution University of Hawai'i at Hilo University of Hawai'i at Mānoa University of Hawaii, Marine Laboratory Climate Variability and Predictability (CLIVAR) Hawaii Air-Sea Logging Experiment - A Long-term Oligotrophic Habitat Assessment (HALE ALOHA) Hawaii Ocean Time-series Program: Biogeochemistry and Ecology Component (HOT-BEACH) JOINT GLOBAL OCEAN FLUX STUDY (JGOFS) Joint Global Ocean Flux Study: Hawaii Ocean Time-series (JGOFS HOT) WHOI Hawaii Ocean Timeseries Site (WHOTS) WORLD CLIMATE RESEARCH PROGRAM World Ocean Circulation Experiment (WOCE) Coastal Waters of Hawaii Hawaiian Islands Humpback Whale National Marine Sanctuary North Pacific Ocean Northeast Pacific Ocean (limit-180) Papahānaumokuākea Marine National Monument oceanography DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce WHOI > WOODS HOLE OCEANOGRAPHIC INSTITUTION AC-1 AC-2 HA-1 HA-2 HA-3 HA-4 HA-5 HOT-1 HOT-10 HOT-100 HOT-101 HOT-102 HOT-103 HOT-104 HOT-105 HOT-11 HOT-12 HOT-13 HOT-14 HOT-15 HOT-16 HOT-17 HOT-18 HOT-19 HOT-2 HOT-20 HOT-21 HOT-22 HOT-23 HOT-24 HOT-25 HOT-26 HOT-27 HOT-28 HOT-29 HOT-3 HOT-30 HOT-31 HOT-32 HOT-33 HOT-34 HOT-35 HOT-36 HOT-37 HOT-38 HOT-39 HOT-4 HOT-40 HOT-41 HOT-42 HOT-43 HOT-44 HOT-45 HOT-46 HOT-47 HOT-48 HOT-49 HOT-5 HOT-50 HOT-51 HOT-52 HOT-53 HOT-54 HOT-55 HOT-56 HOT-57 HOT-58 HOT-59 HOT-6 HOT-60 HOT-61 HOT-62 HOT-63 HOT-64 HOT-65 HOT-66 HOT-67 HOT-68 HOT-69 HOT-7 HOT-70 HOT-71 HOT-72 HOT-73 HOT-74 HOT-75 HOT-76 HOT-77 HOT-78 HOT-79 HOT-8 HOT-80 HOT-81 HOT-82 HOT-83 HOT-84 HOT-85 HOT-86 HOT-87 HOT-88 HOT-89 HOT-9 HOT-90 HOT-91 HOT-92 HOT-93 HOT-94 HOT-95 HOT-96 HOT-97 HOT-98 HOT-99 CLIVAR > Climate Variability HOT > Hawaiian Ocean Time Series Project JGOFS > Joint Global Ocean Flux Study, IGBP WCRP > World Climate Research Program WOCE > World Ocean Circulation Experiment Woods Hole HOT (WHOTS) Woods Hole Hawaii Ocean Time Series (WHOTS) HA-1 HA-2 HA-3 ALOHA-Climax Hawaii Air-sea Logging Experiment, A Long-term Oligotrophic Habitat Assessment (HALE-ALOHA) Hawaii Ocean Time-series (HOTS) Joint Global Ocean Flux Study (JGOFS) World Ocean Circulation Experiment (WOCE) EARTH SCIENCE > AGRICULTURE > ANIMAL SCIENCE > ANIMAL PHYSIOLOGY AND BIOCHEMISTRY EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > INCOMING SOLAR RADIATION EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > DEW POINT TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND DIRECTION EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND SPEED EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD TYPES EARTH SCIENCE > BIOLOGICAL CLASSIFICATION EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA > CYANOBACTERIA (BLUE-GREEN ALGAE) EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > PLANKTON > PHYTOPLANKTON EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SURFACE SALINITY EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH EARTH SCIENCE > OCEANS > OCEAN ACOUSTICS > ACOUSTIC VELOCITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > HYDROCARBONS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SUSPENDED SOLIDS EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS EARTH SCIENCE > OCEANS > OCEAN OPTICS EARTH SCIENCE > OCEANS > OCEAN OPTICS > ATTENUATION/TRANSMISSION EARTH SCIENCE > OCEANS > OCEAN OPTICS > FLUORESCENCE EARTH SCIENCE > OCEANS > OCEAN OPTICS > IRRADIANCE EARTH SCIENCE > OCEANS > OCEAN OPTICS > OCEAN COLOR EARTH SCIENCE > OCEANS > OCEAN OPTICS > PHOTOSYNTHETICALLY ACTIVE RADIATION EARTH SCIENCE > OCEANS > OCEAN OPTICS > SECCHI DEPTH EARTH SCIENCE > OCEANS > OCEAN OPTICS > TURBIDITY EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > POTENTIAL TEMPERATURE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > OCEAN WAVES EARTH SCIENCE > OCEANS > OCEAN WAVES > SEA STATE EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE HEIGHT EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE PERIOD EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY EARTH SCIENCE > OCEANS > TIDES EARTH SCIENCE > OCEANS > TIDES > TIDAL HEIGHT CTD Chlorophyll, Pigment (uG/L) Nitrate (uMOL/KG) Oxygen (micromoles per kilogram) Pressure (Decibars) Salinity (1978 International Practical Salinity Scale) Temperature (Degrees Celsius, International Temperature Scale of 1990) hydrographic data profile data Adenosine 5'-Triphosphate (ATP) (ng/kg) Alkalinity (ueq/kg) Biogeochemical Rate Measurements Bottle Oxygen (umol/kg) Bottle Salinity (PSS-78) CTD CTD Oxygen (UMOL/KG) CTD Pressure (Decibars) CTD Salinity (PSS-78) CTD Salinity (PSU-78) CTD Temperature (ITS-90) Carbon (mg/m2/d) Carbon Assimilation Chlorophyll a. Mean (mg/m3) Chlorophyll and pigment Chlorophylll, Pigment (uG/L) Chlroropyll a. Standard Deviation (mg/m3) Dark - replicate 1 (mg C/m3) Dark - replicate 2 (mg C/m3) Dark - replicate 3 (mg C/m3) Delta-13C of PC (permil vs. VPDB) Delta-15N of PN (permil vs. air-N2) Dissolved Inorganic Carbon (DIC) (umol/kg) Dissolved Organic Carbon (DOC) (umol/kg) Dissolved Organic Nitrate (DON) (umol/kg) Dissolved Organic Phosphate (DOP) (umol/kg) Eukaryotes (E.bact) (10**5/ml) Eukaryotes (no./ml) Fluorometric Chlorophyll a (Chl a.) (ug/l) Guanosine 5'-Triphosphate (GTP) (ng/kg) HPLC 19'-Butanoyloxyfucoxanthin (19 But) (ng/l) HPLC 19'-Hexanoyloxyfucoxanthin (19 Hex) (ng/l) HPLC Alpha Carotens (A.Car) (ng/l) HPLC Beta Carotens (B.Car) (ng/l) HPLC Carotens (caroten) (ng/l) HPLC Chlorophyll [c1+c2] & Mg 3, 8 DVP4A5 (Chl c1+2) (ng/l) HPLC Chlorophyll c1 + c2 + c3 (Chl+) (ng/l) HPLC Chlorophyll c3 (Chl c3) (ng/l) HPLC Chlorophyllide a (Chlda a) (ng/l) HPLC Chloropyll b (Chl b) (ng/l) HPLC Chloropyll c4 (Chl c4) (ng/l) HPLC Diadinoxanthin (Diadino) (ng/l) HPLC Divinyl Chlorophyll a (DV.Chla) (ng/l) HPLC Fucoxanthin (Fuco) (ng/l) HPLC Lutein (Lutein) (ng/l) HPLC Monovinyl Chlorophyll a (MV.Chla) (ng/l) HPLC Peridinin (Peridino) (ng/l) HPLC Prasinoxanthin (Prasino) (ng/l) HPLC Violaxanthin (Viol) (ng/l) HPLC Zeaxanthin (Zeaxan) (ng/l) HPLC chlorophyll a. (HPLCchl) (ng/l) Heterotrophic Bacteria (H.Bact) (10**5/ml) Heterotrophic Bacteria (no./ml) Hydrogen Peroxide (H2O2) (umol/kg) International Temperature Scale of 1990) Light - replicate 1 (mg C/m3) Light - replicate 2 (mg C/m3) Light - replicate 3 (mg C/m3) Low-level Nitrate (LLN) (nmol/kg) Low-level Phosphate (LLP) (nmol/kg) Low-level Silica (LLSi) (umol/kg) Mass (mg/m2/d) NO2 (NMOL/KG) Niskin Bottles Nitrate (uMOL/KG) Nitrate + Nitrite (NO2+NO3) (umol/kg) Nitrogen (mg/m2/d) Nitrous Oxide (N2O) (umol/kg) Oxygen (micromoles per kilogram) P13c (permil) P15N (permil) PE .4u (NG/L) PE 10u (NG/L) PE 5u (NG/L) PIC (UMOL/KG) Partial Pressure of Carbon Dioxide (pCO2) (uatm) Particulate Carbon (PC) (umol/kg) Particulate Inorganic Carbon (mg/m2/d) Particulate Nitrogen (PN) (umol/kg) Particulate Phosphate (PP) (nmol/kg) Pheopigments (Pheo) (ug/l) Pheopigments Mean (mg/m3) Pheopigments Standard Deviation (mg/m3) Phosphate (PO4) (umol/kg) Phosphorus (mg/m2/d) Potential Density (kg/m3) Potential Temperature (ITC-90) Pressure (Decibars) Primary Production Parameters: Prochlorococcus (P.Bact) (10**5/ml) Prochlorococcus (no./ml) Psi (NMOL/KG) SPEC.SI (UMOL/KG) Salinity (1978 International Practical Salinity Scale) Salinity (PSS-78) Sediment Trap Flux Parameters: Silica (mg/m2/d) Silicate (SiO4) (umol/kg) Synechococcus (S.Bact) (10**5/ml) Synechococcus (no./ml) TD700A (UG/L) TD700B (UG/L) TD700C (UG/L) Temperature (Degrees Celsius Temperature (Degrees Celsius) Temperature (ITC-90) Total Dissolved Nitrogen (TDN) (umol/kg) Total Dissolved Phosphorus (TDP) (umol/kg) Transmission bacterioplankton biogeochemical data butanoyloxyfucoxanthin hydrographic data oxygen pH (TOT25, either sws25 or nbs25) peridinin physical data physical oceanographic data prasinoxanthin profile data salinity surface measurements temperature temperature and salinity profile temperature and salinity time series thermosalinograph thermosalinograph data underway data water chemistry profile water column chemical data zeaxan CTD > Conductivity, Temperature, Depth FLUOROMETERS > FLUOROMETERS GRAB SAMPLERS IES > Inverted Echo Sounders INCUBATOR OPTSPEC > Optical Spectrometer OXYGEN METERS > OXYGEN METERS SALINOMETERS SECCHI DISKS > SECCHI DISKS SEDIMENT CORERS > SEDIMENT CORERS THERMISTORS > THERMISTORS THERMOSALINOGRAPHS TRANSMISSOMETERS TRAPS > TRAPS Conductivity-Temperature-Depth (CTD) Gas Tension Device (GTD) FIXED OBSERVATION STATIONS > FIXED OBSERVATION STATIONS Ships ALPHA HELIX (call sign: WSD7078, ICES code: 31HX, 1966-) CROMWELL (ICES code: 31WM) Hi'ialakai (call sign: WTEY, ICES code: 33HL, 2004-) KA'IMIKAI-O-KANALOA (call sign: WBN4310, ICES code: 33KI, 1995-) KAHO (ICES code: 31KA) KAIMALINO (ICES code: 33KA) KILA (ICES code: 33KL) KLAMATH (ICES code: 31KL) KNORR (call sign: KCEJ, ICES code: 316N, 1970-) Kilo Moana (call sign: WDA7827, ICES code: 33KB, 2002-) MARINE VIEW (ICES code: 31MW) MAURICE EWING (call sign: WLDZ, ICES code: 3230, 1988-2005) MELVILLE (call sign: WECB, ICES code: 318M, 1969-) MOANA WAVE (call sign: WUS9293, ICES code: 32MW, 1974-2011) NA'INA (ICES code: 33NA) NESHANIC (ICES code: 32NH) NEW HORIZON (call sign: WKWB, ICES code: 32NM, 1978-2015) OCEANUS (call sign: WXAQ, ICES code: 32OC, 1976-) OSCAR ELTON SETTE (call sign: WTEE, ICES code: 33OC, 2003-) ROGER REVELLE (call sign: KAOU, ICES code: 33RR, 1996-) Sikuliaq (call sign: WDN7246, ICES code: 33BI, 2013-) THOMAS G. THOMPSON (call sign: KTDQ, ICES code: 3250, 1991-) TOWNSEND CROMWELL (ICES code: 31TC) WECOMA (call sign: WSD7079, ICES code: 32WC, 1976-) WESTWIND (call sign: NLKL, ICES code: 31WE, 1952-1988) HALE-ALOHA Mooring OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN HALE ALOHA Hawaii Hawaii Ocean Time Series (HOT) Kaena Point Kahe Point Oahu Pacific Station Aloha central north Pacific HALE ALOHA Hawaii Hawaii Ocean Time Series (HOT) Kaena Point Kahe Point Oahu Pacific Station Aloha central north Pacific complete ocean profile surface to bottom

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