Hawaii Ocean Time-series - HOT central North Pacific Latitude:   22.7500     Longitude:  -158.0000 Associated Investigators: Matthew_J. Church (Program PI, biogeochemistry) , David_M. Karl (Program co-PI, biogeochemistry) ,   Roger Lukas (Program co-PI, physical oceanography) ,   Robert Bidigare (Program co-PI, phytoplankton pigments) ,   John_E. Dore (Collaborator, seawater carbonate system) ,   Ricardo_M. Letelier (Collaborator, bio-optics and remote sensing) ,   Michael Landry (Collaborator, zooplankton ecology) ,   Robert Weller (Collaborator, WHOTS mooring) ,   Al Pleudemann (Collaborator, WHOTS mooring)   Related Web Sites: [hahana.soest.hawaii.edu/hot]   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 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.