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Scientists working on the Hawaii Ocean Time-series (HOT) program have been making repeated observations of the hydrography, chemistry and biology of the water column at a station north of Oahu, Hawaii since October 1988. The objective of this research is to provide a comprehensive description of the ocean at a site representative of the North Pacific subtropical gyre. Cruises are made approximately once per month to the deep-water Station ALOHA (A Long-Term Oligotrophic Habitat Assessment; 22° 45'N, 158° 00'W) located 100 km north of Oahu, Hawaii. Measurements of the thermohaline structure, water column chemistry, currents, optical properties, primary production, plankton community structure, and rates of particle export are made on each cruise.

The 250th Expedition
HOT 25th Anniversary
Ocean 180 Video Challenge
2015 Pavel Lecture
ASM Milestones in Microbiology
Upcoming Cruises
  • HOT-292: Apr 24-28, 2017
  • HOT-293: May 22-26, 2017
  • S-5: May 27-Jun 13, 2017
  • HOT-294: Jun 19-23, 2017

Data Links
Request Sample Acquisition &/or Cruise Participation
Interactive Access to HOT Data (HOT-DOGS)
Cruise Schedules, Chief Scientist Reports & Cast Sheets
Cruise & Drifter Tracks
Yearly Data Reports
Analytical Methods & Results
Current Data Trends
Data Products

What's HOT
What's Happening at Station ALOHA
HYCOM MODIS Seagliders Drifters CTD
ARGOS 84859 ARGOS 60481 SVP UOH-02 SG 148-14 NovaTech 100
ARGOS 3028 ARGOS 60482 SVP UOH-05 SG 512-7 NovaTech 190
ARGOS 60484 ARGOS 84857 Rockblock 780 SG 626-1 NovaTech 200

Other HOT related WWW Servers