Surface Chlorophyll a concentration and Secchi depth data from the SEAHAB project

This was the in situ data collection for the Sensor-agnostic Estimation of Harmful Algal Blooms (SEAHAB) project, March 2023. The data represents two days of surface water sampling between Table Bay and Kommetjie for the purpose of satellite chlorophyll a concentration and water clarity validation.Secchi depth was measured using a weighted 30cm diameter white disk, which was lowered into the water until it can no longer be seen by the observer; the Secchi depth is the depth of the water at the point when the Secchi disk disappears/reappears. Surface seawater samples were collected in 2L plastic bottles, sealed and kept cool and in the dark until filtration on the same day.The contact person for the data is Dr Marie Smith: [e-mail]