NDBC TPOS Mooring Enhancement Pilot Project
In 2016, NOAA announced $4.5 million in funding for new observing technologies supporting ENSO research and publications. This 4-year investment is one of NOAA's contributions to advancing the Tropical Pacific Observing System Project (TPOS 2020, tpos2020.org), rethinking the ocean/marine observing system in the tropical Pacific. This observing system is critical to NOAA's mission to improve weather and climate prediction, modeling, and forecasting.
This pilot study was funded by NOAA/OAR/OOMD.
Title: Enhanced ocean boundary layer observations on the TAO moorings
Project Leads: William Kessler (PMEL), Karen Grissom (NDBC), and Meghan Cronin (PMEL)
The near-surface is the “blind spot” for velocity profiles, whether measured from ships or subsurface moorings. This project from NOAA’s Pacific Marine Environmental Laboratory (PMEL) and National Data Buoy Center (NBDC) installed Acoustic Doppler Current Profilers on existing Tropical Atmospheric Ocean (TAO) moorings. These new sensors measure ocean currents in the upper 40-65 meters of the water column, where direct wind forcing of ocean currents occur.
Hourly ADCP profiler and point current data are available in NetCDF format, by site, from the table below. Telemetered realtime data (filename includes "R"), also at hourly resolution, are provided in cases where downloaded delayed mode data (filename includes "D") are unavailable.
|QC 1 *||Files||Files||Files||Files||Files|
|QC 2 **||Files||Files||Files||Files||Files|
* QC 1 data are filtered to remove surface interference of the acoustic beams based on the equation:
Blanking Depth = Instrument Depth * (1 - cos(BeamAngle)) + CellSize, where blanking depth is the shallowest good depth. Beam angles for this experiment are 25 degrees, and the cell sizes are close to 2 meters, resulting in a blanking depth of about 8 meters. The (varying) instrument depth can be found in the variable PRES.
A magnetic declination correction is also applied. Data are left unevenly gridded, as the instrument depths (and measurement bins) shift vertically with the mooring motion.
Each QC 1 NetCDF file includes the velocity components and their quality control flags, the beam amplitudes, and the mooring metadata. Each link in QC 1 will download a zip file including one file of the profiler data, plus a variable number of point current meter files (depending on site). Typical file sizes are 10 Mb for the profiler data and less than 1 Mb for the point current data.
** QC 2 data files include the profiler velocity components interpolated onto a regular 1-meter vertical grid, with the mooring metadata. These files are constructed from the QC 1 data, thus have the surface interference removed and the magnetic declination corrected. Typical file sizes are 10 Mb.
Data from additional sites (to be deployed in late 2019) will be added as it becomes available.
Corresponding GTMBA data are available at https://tao.ndbc.noaa.gov/tao/data_download/search_map.shtml.