adcp measurements on the wap shelf: year 1
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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ADCP Measurements on the ADCP Measurements on the WAP shelf: Year 1WAP shelf: Year 1
Susan Howard, Laurence Padman, Robin Muench, and John Gunn
Earth and Space ResearchEarth and Space Research
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TopicsTopics
• Summarize ADCP measurements– ADCP configuration– Status of processing– Quality of data
• Preliminary results– Major circulation features– Mixing proxies
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ADCP DataADCP 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)
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Summary of DataSummary 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.
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Location of good Location of good ADCP data: ADCP data:
Year 1Year 1
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Status of ProcessingStatus 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.
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Preliminary ResultsPreliminary Results
• Circulation features from ADCP• Mixing proxies (diffusivity inferred from
Richardson numbers)
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Gridded DataGridded Data1/41/4oo x 1/4 x 1/4oo
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Gridded DataGridded Data1/41/4oo x 1/4 x 1/4oo
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Coastal CurrentCoastal Current
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Currents at Currents at Shelf BreakShelf Break
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Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is. Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is.
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MixingMixing
• Evidence of strong shear in much of the total ADCP record.
• Richardson number (Ri) obtained from ADCP and CTD can indicate potential for mixing.
2/
/
z
zgRi
o
U
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NBP0103 Station 76NBP0103 Station 76
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NBP0103 Station 76NBP0103 Station 76
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Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is.Near-Inertial Motion: LMG0106 Site 3 off Adelaide Is.
25 W m-2
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Diurnal Tides Near the Shelf BreakDiurnal Tides Near the Shelf Break
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Next StepsNext Steps
• Identify additional ADCP datasets.• Additional editing.• Remove tides.• Extend mixing study to entire data set.
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AcknowledgementsAcknowledgements
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.