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Dataset Overview | National Centers for Environmental Information (NCEI)

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

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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.

This dataset also includes physical-biogeochemical measurements from Station HALE-ALOHA (Hawai'i Air-sea Logging Experiment, A Long-Term Oligotrophic Habitat Assessment), measurements of high-quality air-sea fluxes and the associated upper ocean response from The Woods Hole Oceanographic Institution (WHOI) Hawaii Ocean Timeseries (HOT) Site (WHOTS), as well as hydrographic and biogeochemical parameters from the ALOHA-CLIMAX Regional Study.
  • Cite as: Lukas, Roger; Church, Matthew J.; Karl, David M.; University of Hawaii (2001). 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. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/Station-ALOHA-HOT. Accessed [date].
gov.noaa.nodc:Station-ALOHA-HOT
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Distribution Formats
  • TS (HOT Thermosalinograph Data Format) (Version: 2015-03-16)
  • CTD (HOT CTD Data Format) (Version: 2008-06-18)
  • FLUX (BEACH Sediment Trap Flux Data Format) (Version: 2006-11-28)
  • PP (BEACH Primary Production Data Format) (Version: 2018-05-11)
  • GOF (BEACH Water Column Chemical Data Format) (Version: 2007-04-11)
  • SEA (WOCE Water Sample Data Format) (Version: Rev. 2, 1998-02)
  • SUM (WOCE Station Summary Data Format) (Version: Rev. 2, 1998-02)
  • MET (HOT Meteorological Observation Data Format) (Version: 1997-10-07)
  • IES (HOT Inverted Echo Sounder Data Format) (Version: 1999-09-03)
  • RBR (Richard Brancker Research Thermister Data Logger Format) (Version: 1997)
Ordering Instructions Contact NCEI for other distribution options and instructions.
Distributor NOAA National Centers for Environmental Information
+1-301-713-3277
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Time Period 1988-10-01 to 2024-12-22
Spatial Bounding Box Coordinates
West: 157.691
East: -157.324
South: 20.716
North: 24.914
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2001-07-05
  • revision: 2026-03-25
  • creation: 1993
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete - production of the data has been completed
Historical archive - data has been stored in an offline storage facility
Data Update Frequency As needed
Purpose To describe and understand the ocean climate and variability at a deep-water site in the North Pacific subtropical gyre near Hawaii.
Use Limitations
  • accessLevel: public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Dataset Citation
  • Cite as: Lukas, Roger; Church, Matthew J.; Karl, David M.; University of Hawaii (2001). 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. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/Station-ALOHA-HOT. Accessed [date].
Cited Authors
Principal Investigators
Collaborators
Contributors
Resource Providers
Publishers
Acknowledgments
  • Hawaii Ocean Time-series (HOT) was initiated and funded through grants from the National Science Foundation under the auspices of the Joint Global Ocean Flux Study (JGOFS) and the World Ocean Circulation Experiment (WOCE). The field phase of these programs has ended, but support from the Ocean Sciences Division of NSF has enabled continuation of our basic HOT measurement program. The physical oceanographic component contributes to the objectives of the World Climate Research Programme (WCRP) Climate Variability and Predictability (CLIVAR) Programme by providing information on interannual to decadal variability of the North Pacific Ocean. The US CLIVAR Office funded the physical oceanographic data during 2008.
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Global Change Master Directory (GCMD) Science Keywords None
  • 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
Originator Keywords
  • 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
Data Center keywords NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords
Platform keywords NODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords ICES/SeaDataNet Ship Codes Originator Platform Names
  • HALE-ALOHA Mooring
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords Originator Instruments
  • Conductivity-Temperature-Depth (CTD)
  • Gas Tension Device (GTD)
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords None
  • HALE ALOHA
  • Hawaii
  • Hawaii Ocean Time Series (HOT)
  • Kaena Point
  • Kahe Point
  • Oahu
  • Pacific
  • Station Aloha
  • central north Pacific
Originator Place Names
  • HALE ALOHA
  • Hawaii
  • Hawaii Ocean Time Series (HOT)
  • Kaena Point
  • Kahe Point
  • Oahu
  • Pacific
  • Station Aloha
  • central north Pacific
Project keywords NODC PROJECT NAMES THESAURUS Cruise ID
  • 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
Global Change Master Directory (GCMD) Project Keywords Originator Keywords
  • Woods Hole HOT (WHOTS)
  • Woods Hole Hawaii Ocean Time Series (WHOTS)
Originator Mooring Deployments
  • HA-1
  • HA-2
  • HA-3
Originator Project Names
  • 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)
Stratum keywords None
  • complete ocean profile surface to bottom
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Lukas, Roger; Church, Matthew J.; Karl, David M.; University of Hawaii (2001). 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. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/Station-ALOHA-HOT. Accessed [date].
Access Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: series
Processing Steps
  • 2001-07-05T19:06:32Z - NCEI Accession 0000497 v1.1 was published.
  • 2001-12-18T22:11:38Z - NCEI Accession 0000639 v1.1 was published.
  • 2002-01-03T05:00:00Z - NCEI Accession 0000640 v1.1 was published.
  • 2002-01-03T05:00:00Z - NCEI Accession 0000641 v1.1 was published.
  • 2002-11-19T19:40:22Z - NCEI Accession 9300009 v1.1 was published.
  • 2002-11-19T19:40:22Z - NCEI Accession 9300009 was revised and v2.2 was published.
  • 2002-11-19T19:40:22Z - NCEI Accession 9300040 v1.1 was published.
  • 2002-11-19T19:40:22Z - NCEI Accession 9300148 v1.1 was published.
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  • 2013-03-16T20:22:22Z - NCEI Accession 0000497 was revised and v1.2 was published.
  • 2013-03-17T13:37:33Z - NCEI Accession 0000640 was revised and v1.2 was published.
  • 2013-03-17T13:44:18Z - NCEI Accession 0000641 was revised and v1.2 was published.
  • 2013-03-17T19:58:16Z - NCEI Accession 0001704 was revised and v1.2 was published.
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  • 2013-03-17T19:58:42Z - NCEI Accession 0001710 was revised and v1.2 was published.
  • 2013-03-19T22:25:53Z - NCEI Accession 9700176 was revised and v1.2 was published.
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  • 2015-02-09T22:12:13Z - NCEI Accession 0125579 v1.1 was published.
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  • 2016-01-08T15:03:04Z - NCEI Accession 0140225 v1.1 was published.
  • 2019-08-19T14:35:43Z - NCEI Accession 9300040 was revised and v2.2 was published.
  • 2020-05-26T20:18:21Z - NCEI Accession 0140225 was revised and v2.2 was published.
  • 2020-05-28T21:07:10Z - NCEI Accession 0011142 was revised and v2.2 was published.
  • 2020-05-28T21:08:30Z - NCEI Accession 0125648 was revised and v2.2 was published.
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  • 2020-05-29T00:49:01Z - NCEI Accession 0041849 was revised and v2.2 was published.
  • 2020-05-29T00:55:35Z - NCEI Accession 0059943 was revised and v2.2 was published.
  • 2020-05-29T01:16:37Z - NCEI Accession 0048896 was revised and v2.2 was published.
  • 2020-11-26T08:49:24Z - NCEI Accession 0218247 v1.1 was published.
  • 2021-01-16T04:20:36Z - NCEI Accession 0224688 v1.1 was published.
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  • 2021-01-21T10:38:53Z - NCEI Accession 0224849 v1.1 was published.
  • 2021-10-18T00:43:21Z - NCEI Accession 0242075 v1.1 was published.
  • 2022-01-02T22:06:13Z - NCEI Accession 0000497 was revised and v1.3 was published.
  • 2022-12-07T15:23:06Z - NCEI Accession 0242075 was revised and v2.2 was published.
  • 2023-01-15T23:55:47Z - NCEI Accession 0276338 v1.1 was published.
  • 2023-02-15T15:04:23Z - NCEI Accession 9300009 was revised and v2.3 was published.
  • 2023-02-16T09:53:37Z - NCEI Accession 9800125 was revised and v1.2 was published.
  • 2023-02-16T14:16:48Z - NCEI Accession 9900206 was revised and v1.2 was published.
  • 2023-02-16T14:17:13Z - NCEI Accession 9900207 was revised and v1.2 was published.
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  • 2023-02-16T14:28:32Z - NCEI Accession 9900215 was revised and v1.2 was published.
  • 2023-02-16T23:44:45Z - NCEI Accession 9900213 was revised and v1.2 was published.
  • 2023-10-18T23:45:56Z - NCEI Accession 0284084 v1.1 was published.
  • 2024-10-16T23:45:43Z - NCEI Accession 0284084 was revised and v2.2 was published.
  • 2024-10-18T23:47:53Z - NCEI Accession 0298064 v1.1 was published.
  • 2025-09-30T20:51:56Z - NCEI Accession 0308400 v1.1 was published.
  • 2025-12-30T17:39:31Z - NCEI Accession 0000639 was revised and v1.2 was published.
  • 2025-12-30T20:29:41Z - NCEI Accession 0046427 was revised and v1.2 was published.
  • 2025-12-30T21:13:06Z - NCEI Accession 0224849 was revised and v1.2 was published.
  • 2025-12-30T21:13:36Z - NCEI Accession 0276338 was revised and v1.2 was published.
  • 2025-12-30T21:15:41Z - NCEI Accession 0284084 was revised and v2.3 was published.
  • 2025-12-30T21:38:45Z - NCEI Accession 0298064 was revised and v1.2 was published.
  • 2025-12-30T21:42:54Z - NCEI Accession 0308400 was revised and v1.2 was published.
  • 2026-03-04T21:49:36Z - NCEI Accession 9900208 was revised and v1.3 was published.
  • 2026-03-13T18:40:43Z - NCEI Accession 0001016 was revised and v1.2 was published.
  • 2026-03-13T18:42:10Z - NCEI Accession 9900206 was revised and v1.3 was published.
  • 2026-03-25T01:37:40Z - NCEI Accession 9300148 was revised and v1.2 was published.
  • 2026-03-25T01:38:00Z - NCEI Accession 9300149 was revised and v1.2 was published.
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Acquisition Information (collection)
Instrument
  • bathythermograph - XBT
  • bottle
  • buoy - moored buoy
  • carbon-14 incubation
  • CTD
  • fluorometer
  • inverted echo sounder (IES)
  • irradiance detector
  • laboratory analysis
  • meteorological sensor
  • oxygen sensor
  • radiometer
  • salinometer
  • Secchi disk
  • sediment sampler - corer
  • sediment sampler - grab
  • spectrophotometer
  • thermistor
  • thermosalinograph
  • transmissometer
  • trap - sediment
  • visual analysis
Platform
  • 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
  • UNKNOWN PLATFORMS OF UNITED STATES
  • USCGC Klamath
  • USCGC Westwind
Last Modified: 2026-04-02T17:03:57Z
For questions about the information on this page, please email: ncei.info@noaa.gov