Dear OOI community,
I was having some trouble understanding the VELPTMN (mean point water velocity) data product from the Southern Ocean Apex surface mooring for deployment 2 and 3.
First, I want to confirm with you that in both deployments the single point velocity meter was implemented at depth of approximately 13m as indicated by the pressure measurement. If I didn’t interpret the depth wrong, then I noticed that the velocity measurements for deployment 2 (year 2016) are almost an order of magnitude larger than that for deployment 3 (year 2017 and 2018).
I doubled checked SST and air temperature data from the Bulk Meteorology Instrument package but they seemed much more continuous than the velocities. I wonder are there some instrument changes/calibrations or data scalings that I wasn’t aware of or should I interpret the results physically?
I further noticed that the VELPTMN data product I acquired from the single velocity meter has frequency of 15 minutes whereas the same VELPTMN data from the Bulk Meteorology Instrument package has frequency of 1 minute. I wonder whether the 1-minute data is from linear interpolation?
Any help or comments are greatly appreciated!