Publication Date:
2023-03-16
Description:
Ocean bottom pressure (OBP) variability serves as a proxy of ocean mass variability, the knowledge of which is needed in geophysical applications. We present a new multi-year data set, obtained with an array of bottom pressure gauges deployed deeply along a transect across the Southern Ocean. We present a description of OBP data and show large scale correlations over several thousand kilometres at all time scales using daily and monthly averaged data. Annual and semi-annual cycles are weak. Close to the Agulhas Retroflection, signals of up to 30 cm equivalent water height (EWH) are detected. Further south, signals are mostly intermittent and noisy.
station identifier ANT03_3
longitude 12.7538
latitude -37.0973
depth 4909 m
timespan 2011 to 2014
unit for time is Julian day after 31.12.2009
unit for bottom pressure anomaly is dbar
All data detided, dedrifted and low-passed filtered with 4th order Butterworth 3-day, sampling interval 12hours, data gaps less the 1 day interpolated prior to filtering.
Subsequently, data are band pass filtered with two-way 4th order Butterworth for periods::
OBP3minus shorter than 3 days
OBP3to10 between 3 days and 10 days
OBP10to30 between 10 and 30 days
OPB30plus periods longer than 30 days
Contact: olaf.boebel@awi.de, jens.schroeter@awi.de
Keywords:
ANT03_3; ANT-XXX/2; daily and monthly scales; DATE/TIME; DEPTH, water; Inverted echo sounder equipped with pressure sensor; Julian day; ocean bottom pressure recorder; PIES; Polarstern; PS89; Water pressure anomaly
Type:
Dataset
Format:
text/tab-separated-values, 14320 data points
