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NELHA's
Seawater Quality Data
• Cold Deep Seawater 42º F/ 6º C 2000 feet depth,
Cold, Nutrient Rich, Pure. At the 600 meter depth, the temperature
of the seawater is approximately 6 degrees C and warms up less
than 1/2 degree as it travels the 1.7 km pipes. With this extreme
cold readily available, the seawater can be used for a series
of purposes that warm the seawater without altering the other
properties; and it can be blended with surface sea water to
achieve specific temperatures. The deep seawater is also from
a depth below the mixing layer and the photic zone of the ocean.
Without sunlight there is no primary productivity, so there
are fewer living organisms, resulting in a virtually pathogen-free
environment. The deep seawater also has significantly elevated
levels of inorganic nitrates, silicates and phosphates compared
to the nutrient deficient surface water. These nutrients are
necessary for sustained growth of microalgae and macroalgae.
All parameters of both the surface and deep seawater indicate
low long-term variability. This characteristic provides reliability
to the users of the seawater.
• Warm Surface Seawater 76-82º F/ 24.5-27.5º C 50
feet depth, Class AA.
Average Values of Key Parameters in NELHA's
Seawater Supply
| PARAMETER |
SURFACE
SEAWATER (SSW) |
DEEP
SEAWATER (DSW) |
 |
| Temperature |
75 - 83ºF
(24 - 28.5ºC) |
43 – 46ºF
(6 – 8ºC)* |
|
| Salinity (º/oo
or parts per thousand) |
34.7 º/oo |
34.3 º/oo |
|
| pH |
8.3 |
7.6 |
|
| Alkalinity (milliequivalents/liter) |
2.31 mEq/l |
2.36 mEq/l |
|
| NO3 / NO2 (micromoles/liter) |
0.24 µm/l |
39.0 µm/l |
|
| PO4 (micromoles/liter) |
0.15 µm/l |
2.89 µm/l |
|
| Si (micromoles/liter) |
2.64 µm/l |
74.56 µm/l |
|
| NH4 (micromoles/liter) |
0.20 µm/l |
0.06 µm/l |
|
| Dissolved Organic
Nitrogen (micromoles/liter) |
5.39 µm/l |
41.36 µm/l |
|
| Dissolved Oxygen
(milligrams/liter) |
6.87 mg/l |
1.24 mg/l |
|
| Total Organic
Carbon (milligrams/liter) |
0.68 mg/l |
0.50 mg/l |
|
| Total Suspended
Solids (milligrams/liter) |
0.88 mg/l |
0.34 mg/l |
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*
The deep seawater intake temperature is 6 ± 0.5ºC.
Higher temperatures are due to warming in the delivery system.
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