Dataset: TN327 Axial 2015 MAPR Mooring Data
Deployment: TN327

Data for temperature, pressure, and turbidity collected by Miniature Autonomous Plume Recorders (MAPR's) near the Axial Seamount on the Juan de Fuca Ridge. The MAPR's were equipped with a Seapoint light-backscattering sensor, a temperature sensor, and a pressure sensor. The light-backscattering sensor measures “Nephelometric Turbidity Units”, which are a dimensionless, relative measure of particle mass concentration. The data for each MAPR includes information for elevation above the seafloor and the depth below the surface.

Four MAPR's were deployed at different elevations above the seafloor: M34 at 55m, M12 at 80m, M13 at 105m, and M35 at 130m.  

The mooring was deployed at 46.0934°N, 129.9814°W, at a bottom depth of 1780 m , on 27 August 2015, and recovered on 21 July 2017. A MAPR at 30 m above bottom (mab) failed to log. Batteries in MAPRs M12, M13, and M35 failed between early Nov and early Dec 2015. M34 recorded for the entire deployment, but data after ~February 2016 is unusable because of biofouling.

See details of Mooring operations in the online cruise reports for 2015 and 2017: 
https://www.pmel.noaa.gov/eoi/axial/2015/Axial2015-Cruise-Report-with-logs-revised.pdf
https://www.pmel.noaa.gov/eoi/axial/2017/Axial-2017-CruiseReport-final-nologs.pdf

For an example of using moored MAPRs to measure temporal changes in water turbidity, see (Dziak et al., 2015).

Information on NOAA-PMEL MAPR:
https://www.pmel.noaa.gov/eoi/PlumeStudies/mapr/