The Varadero Reef is located south-west of the Cartagena Bay close to the southern strait that connects the Bay to the Caribbean Sea in Colombia (10\u00b018\u201923.3\"N, 75\u00b035\u201908.0\"W). The Bay is a receiving estuary from the Magdalena River through the Canal del Dique, a man-made channel whose construction and operation dates back almost a century. The depth of the particular transplant site in Varadero is 3.5m.
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Irradiance was monitored for one year (November 2016 - November 2017) at Varadero with cosine-corrected light sensors (Odyssey submersible PAR logger, Dataflow systems, New Zealand), previously cross-calibrated against a manufacturer-calibrated quantum sensor (LI-1400, LI-COR, USA). The light sensors were cleaned and downloaded periodically (every two months or less) to avoid biofouling. Data in which cumulative light signal loss was evident were discarded.
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In order to estimate the variation of the optical properties of water resulting from the Dique plume dynamics, light data recorded underwater were compared with data simultaneously recorded by another sensor in a site onshore close to Varadero (Fig. 5). With this array, we were able to isolate the variations of irradiance associated with the plume from variations due to cloud coverage. The irradiance synchronously recorded by onshore and underwater loggers was used to estimate the variability of Kd based on the Lambert-Beer\u2019s law: Kd = ln (Ez / E0) / -Z,
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where Ez is the irradiance recorded underwater, E0 is the irradiance recorded onshore, and Z is the depth at which the underwater sensor was deployed in Varadero (3.5 m). Only data recorded between 7:00 and 17:00 were employed.
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Odyssey data logging software (Dataflow systems Ltd., Christchurch, New Zealand) was used to manage the logger and data operations.
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Problem report:\u00a0There are some gaps associated with technical failure of the devices.
This dataset contains the primary data of irradiance recorded underwater and onshore and the estimated light attenuation coefficient, Kd, based on these data in Varadero Reef, Colombia, August - November 2017. The irradiance recorded synchronously onshore and underwater were used to estimate the variability of the light attenuation coefficient (Kd) resulting from temporal variation of the optical properties of water.
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These data were used in the manuscript \u201cDegradation of the underwater light environment: physiological and ecological consequences for reef corals\u201d submitted to the Journal Nature Communications Biology. [under review,\u00a02019-12-28]
BCO-DMO Processing Notes:
\n- added conventional header with dataset name, PI name, version date
\n- modified parameter names to conform with BCO-DMO naming conventions
\n- reformatted date from m/d/yyyy\u00a0 to yyyy-mm-dd
\n- added ISO_DateTime_UTC column
\n- blank values were replaced with no data value 'nd'