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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.

HOT 25th Anniversary

"In October 2013, the HOT program began its 25th year of sustained ocean measurements at Station ALOHA. The resulting time-resolved suite of measurements fundamentally changed our view of ecosystem variability in the subtropical North Pacific. The emergent data highlighted connectivity between ocean-climate, plankton ecology, and biogeochemistry over episodic to decadal time scales. Among the many achievements, HOT has contributed to our understanding of long-term trends in ocean carbon inventories and fluxes, documented previously unrecognized temporal variability in nutrient fluxes and inventories, and documented the important role of plankton community structure in carbon sequestration." (Matt Church, UH - Oceanography Seminar)

Our 250th Expedition

On March 9, 2013, the UH research vessel Kilo Moana returned from the 250th scientific expedition of the Hawaii Ocean Time-series (HOT) program after nearly 25 years of approximately monthly research cruises. After returning from this 250th cruise, Chief Scientist Fernanado Sandtiago-Mandujano said, "This cruise was very successful especially because we had very good weather and also because the science participants are very professional and have been in the project for a long time. They have a lot of experience. Also, the Captain of the Kilo Moana and the crew members have helped us a lot in conducting our operations successfully."

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Upcoming Cruises
  • C-19: Dec 8-12, 2014
  • HOT-268: Dec 15-19, 2014
  • HOT-269: Feb 19-23, 2015
  • HOT-270: Mar 16-20, 2015

Data Links
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Cruise Schedules, Chief Scientist Reports & Cast Sheets
Yearly Data Reports
Analytical Methods & Results
Current Data Trends
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What's HOT
What's Happening at Station ALOHA
HOTlocations 8514H Platform 1833 Platform 3028 Platform 60481 Platform 60482 Platform 60484 Platform 84857 ALOHA Map

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