The NATURAL ENERGY LABORATORY OF HAWAII AUTHORITY (NELHA) is a state agency that operates a unique and innovative ocean science and technology park in Kailua-Kona on the island of Hawaii. It supports an Ocean Thermal Energy Conversion (OTEC) facility at Keahole Point on the west coast of the Island of Hawaii. Intake pipes at deep (675 m) and shallow (20 m) are utilized to record water characteristics. This data set includes roughly bi-weekly samples of temperature, salinity and water chemistry.
Support research at the NELHA
NOAASupplemental: Entry_ID: Unknown Sensor_Name: standard system Source_Name: manual Project_Campaign: State of Hawaii Originating_Center: NELHA Storage_Medium: MS Excel Online_size: 1591 kbyte Resource Description: NODC Accession Number 0001623
ground condition
Dataset credit required
73-4460 Queen Kaahumanu Hwy. #101
State of Hawaii, Natural Energy Laboratory Hawaii Authority
see lineage, process step
none
Cold water was collected via a 675 meter deep one meter diameter HDPE pipe located 1.6 km from shore. Water velocities are slow enough that no significant heating occurs by friction. Warm water is taken from a 28 inch pipe 20 meters deep located near shore. Each data value is a separate sample that is corrected against the calibration of the machine it is run on. The instrumentation is calibrated against a set of standards that are either solutions formulated by our chemists or against a standard that comes in a sealed glass ampoule from a certified lab on the mainland or Europe. A set of samples (15-50) are run on the calibrated instrumentation (machines) over a period of about 2-8 hours depending on the parameter measured. The time of day varies, although the measurement is usually determined between 11:00 a.m. to 4:00 p.m. Most of the samples are run fresh and not preserved in any way, except DO's. We measure dissolved oxygen using the Winkler Titration method, so the samples are preserved with a two chemical process immediately after the sample is taken. The shallow intake was between 65-70 ft. It is actually closer to 45-50 ft., which is still probably well below influence of sunlight.
Original file is ../../data/NELHA_Surface___Deep_Seawater_Chemistry.xls, MS Excel There are two sheets in this MS Excel file, which were separately dumped into ASCII Comma Separated Version (CSV) files: NELHA_Surface___Deep_Shallow.csv NELHA_Surface___DSW_40inch_Pipe_Chemistry.csv Dates and units are clearly indicated for each parameter.
SSMC-3 Fourth Floor
1315 East West Highway
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1000 Pope Road, MSB 316
Dept. of Oceanography
University of Hawaii at Manoa
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