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Airborne Magnetic Measurements Associated with SW06 Experiment

Airborne Magnetic Measurements Associated with SW06 Experiment. SW06 Post-Experiment Meeting. Will Avera Pat Gallacher, Wayne Kinney Naval Research Laboratory And Brad Nelson Defence Research and Development Canada. Objective / Purpose. Measure magnetic fields in the vicinity of NLIW’s

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Airborne Magnetic Measurements Associated with SW06 Experiment

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  1. Airborne Magnetic Measurements Associated with SW06 Experiment SW06 Post-Experiment Meeting Will Avera Pat Gallacher, Wayne Kinney Naval Research Laboratory And Brad Nelson Defence Research and Development Canada

  2. Objective / Purpose • Measure magnetic fields in the vicinity of NLIW’s • Test theoretical predictions • Internal waves can produce measurable magnetic signatures

  3. Plan / Measurements • 12 flight lines were collected over NLIWs on August 2, 2006 • 4 lines @ 300’ (Lines 1,2,3,4) • 4 lines @ 500’ (Lines 5,6,11,12) • 2 lines @ 1000’ (Lines 7,8) • 2 lines @ 2000’ (Lines 9,10) • each line was ~ 10 minutes in length (~ 60 km) + 3 minutes per corner • All lines were along the same track • 39.5317 N , 73.6478 W to 38.9560 N , 73.0213 W • Start point and bearing for this line were given to us by Jim Moum who was on the OCEANUS • OCEANUS was in the middle of one NLIW packet

  4. SW06 SW_06_new Domain (0.5km) current simulations NRC Convair flight line LBSF Domain (0.5km) future simulations SW06 Moorings Simulations and Analysis -Very high resolution -MITgcm nonhydrostatic simulation -Forced with nested NCOM -Focus on nonlinear internal wave -Based on previous work including -MITgcm simulations of Hudson Canyon generation area -Nested NCOM simulations of high amplitude internal waves on shelf and slope in SW06

  5. The NRC Convair • Convair data acquisition system • 3 Cesium total-field magnetometers • 2 vector magnetometers for compensation • Attitude and noise sensors • Post-processed DGPS navigation @ 4 Hz

  6. 500’ Results: Track Reproducibility : Lines 5,6,11,12 Line 11 Unfiltered All 4 Lines Overly South North • Excellent reproducibility => Good geologic noise removal

  7. Magnetic Results: 500’ Alt - Lines 5, 6, 11, 12 Magnetic Data Model : U Velocity NLIW ? Green =Line 12 1700 UT Lt. Blue = Line 11 Blue = Line 6 1600 UT Black = Line 5 Ships > 1 mile off line OCEANUS 1500 UT • OCEANUS located near the internal wave activity • OCEANUS location sufficiently distant not to be disturbing measurements

  8. Magnetic Results: 500’ Alt - Lines 5, 6, 11, 12 Magnetic Data Model : W Velocity NLIW ? Green =Line 12 1700 UT Lt. Blue = Line 11 Blue = Line 6 1600 UT Black = Line 5 Ships > 1 mile off line OCEANUS 1500 UT • OCEANUS located near the internal wave activity • OCEANUS location sufficiently distant not to be disturbing measurements

  9. Conclusions (So Far) • Data processing techniques • Appear to work for external magnetic noise reduction • Anomalous residual noise on east side of the line is good candidate for NLIW • Jim Moum claimed the ship was in the middle of the NLIW • Residual noise correlated with OCEANUS position

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