ADCP Measurements on the WAP shelf: Year 1

	Susan Howard, Laurence Padman, Robin Muench, and John Gunn
	Earth and Space Research

Topics

	Summarize ADCP measurements
		ADCP configuration
		Status of processing
		Quality of data
	Preliminary results
		Major circulation features
		Mixing proxies

ADCP Data

	Ensemble and Single Ping data collected on all cruises.
	Setup:
	5 min ensembles, 8 m depth bins
	Pulse length (~ vertical averaging scale)
		16 m (Gould: mooring and fall cruises)
		8 m  (All other cruises)

Summary of Data

	Good regional coverage and valuable “process” data from Gould process sites.
	In general, 300m-400m depth coverage.
	Substantial data loss (entire profiles) when underway in ice and in bad weather.

Slide 5

Status of Processing

	ADCP data from GLOBEC I and II data have been processed.
	ADCP data from the first mooring cruise is still being processed.
	MAT files available at http://www.esr.org/globec/adcp_data.html.
	Data will be also served with JGOFS software.
	Additional editing is required on all data sets.

Preliminary Results

	Circulation features from ADCP
	Mixing proxies (diffusivity inferred from Richardson numbers)

Gridded Data
1/4^o x 1/4^o

Gridded Data
1/4^o x 1/4^o

Coastal Current

Currents at
Shelf Break

Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is.

Mixing

	Evidence of strong shear in much of the total ADCP record.
	Richardson number (Ri) obtained from ADCP and CTD can indicate potential for mixing.

NBP0103 Station 76

NBP0103 Station 76

Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is.

Diurnal Tides Near the Shelf Break

Next Steps

	Identify additional ADCP datasets.
	Additional editing.
	Remove tides.
	Extend mixing study to entire data set.

Acknowledgements

	Eric Firing, Jules Hummon, and Teri Chereskin have provided us with invaluable assistance in the configuration and support of the shipboard systems, as well as initial processing.