Expedition South Seas

JBL Expedition South Seas I and II

JBL Expedition South Seas I and II

Water and light measurements, results

Water tests were on the agenda, of course. Measurements were taken both inside a lagoon and outside in the open ocean. And of course we measured the water parameters with JBL PROAQUATEST water tests. We measured the seawater density first with the JBL precision analyser when the boat was lying still and then with a refractometer when the boat was rocking.

Fakarava, Tetamanu, inside of the south passage

GPS: -16.515532, -145.464202

May 5, 2023: 12:01 pm
Water surface temperature 29.2 °C
Conductivity 54.5 mS/cm
Density 1.026; 36 ‰
KH 8 °dKH
pH 8.2-8.4
Calcium 420 mg/l
Magnesium 1860 mg/l
Oxygen 10 mg/l
Air temperature 31.2 °C
Humidity 56 %

Apataki Atoll, outside of the north passage

GPS: -15.313091, -146.415261

July 21, 2023: 10:55 a.m. slightly cloudy
Air temperature 28.5 °C
Humidity 58 %
UV-A 1.38 W/m 2
UV-B 0.47 W/m 2
Lux directly above the water surface 33,400 Lux

Toau, inside the north passage

GPS: -15.803247, -146.153428

June 4, 2023: noon cloudless sky
Water surface temperature 28.9 °C
Water extremely clear. Visibility approx. 40 m
Lux above the water surface 103,400 Lux
Lux directly below the water surface 84,000 Lux
Lux UV-A UV-B
Above surface 103,400 2.7 0.86
At a depth of 10 cm 76,000 1.5 0.57
At a depth of 20 cm 68,000 1.2 0.54
At a depth of 30 cm 58,000 1.0 0.47
At a depth of 40 cm 45,000 1.0 0.43
At a depth of 50 cm 30,000 1.0 0.41

Carrying out the measurements

WinLab luxmeter with 5 m cable and waterproof sensor.

One team member stands on the boat with the device, a second is in the water. A folding rule firmly attached to the stern of the boat (no swell) reaches under water and shows the water depth. The person in the water holds the sensor at the depth to be measured next to the folding rule and turns the sensor towards the sun. The person on board notes the highest value displayed.

Same procedure for the UV measurements. Device: Opsytec Dr Gröbel, RM12

Kauehi, southwest passage, outer reef

GPS: -15.954749, -145.178378

July 17, 2023: 09:00 a.m.
Water surface temperature 27.0 °C
Conductivity 55.1 mS/cm
Density 1.026; 36 ‰
KH 7 °dKH
pH 8.2
Calcium 420 mg/l
Magnesium 1500 mg/l
Oxygen 10 mg/l
Air temperature 27.0 °C
Humidity 68 %
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