Project Title: Small Project: Water chemistry surrounding West Florida’s Deep Sea Lophelia Reefs
Project Summary

Lead: Peter Etnoyer

This project will estimate carbonate saturation from 60 water samples along West Florida Escarpment in 2017, collected between 50 and 500 m depth while aboard NOAA ship Nancy Foster. From these data, the project will produce new graphics showing depth profiles of carbonate saturation, total alkalinity (TA) and dissolved inorganic carbon (DIC) in and around deep-sea Lophelia reefs in the Gulf of Mexico. The purpose is to determine whether Lophelia reefs are growing in oversaturated or undersaturated carbonate conditions, and how this varies by depth and time of day. The water chemistry data will be analyzed by United States Geological Survey and processed under contract with Dr. Jay Lunden at Temple University.

Anticipated Management Application(s)

In addition to the carbonate saturation values (omega) for these samples, a synopsis will be created of potential improvements, comparisons to other water column profiles at these depths in the region, to help advance understanding of the threat of ocean acidification to deep Lophelia corals in SEDCI region.

Location(s):
  • Gulf of Mexico
  • W. Florida shelf
Point of Contact: Office of the Point of Contact:
  • NOS NCCOS
Project Title: Small Project: Water chemistry surrounding West Florida’s Deep Sea Lophelia Reefs
Methods/Approach

Carbonate saturation values (omega) for all NF1708 water samples will be calculated using R package in seacarb or other software. The omega calculation will use necessary parameters for depth, pressure, temperature, oxygen, etc. to produce the best possible assessment of aragonite saturation values at depth. The final spreadsheet will be ultimately compatible with NCEI upload guidelines, to make the data publicly available. 

Also produced will be a brief synopsis of the results of an approximate comparison of day/night values, with qualitative comparison of whether or day/night values are/not significantly different. A brief synopsis of any potential improvements comparisons to other water column profiles at these depths in the region, to help advance understanding of the threat of OA to deep Lophelia corals in SEDCI region



Project Results and Management Outcomes  None Defined

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