A new drifting device to measure internal waves in the upper ocean by Luca Centurioni and Peter Niiler [email protected] Scripps Institution of Oceanography, La Jolla, CA,USA DBCP Scientific and Technical Workshop, 10/17/2005 In collaboration with Vitalii Sheremet (GSO- URI), Ruo-Shan Tseng (National Sun Yat-sen University) and Jian-Hwa Hu (National Taiwan Ocean University)
A new drifting device to measure internal waves in the upper ocean by Luca Centurioni and Peter Niiler [email protected] Scripps Institution of Oceanography,
Apr 01, 2015
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A new drifting device to measure internal waves in the upper ocean
byLuca Centurioni and Peter Niiler
Scripps Institution of Oceanography, La Jolla, CA,USA
DBCP Scientific and Technical Workshop, 10/17/2005
In collaboration with Vitalii Sheremet (GSO-URI), Ruo-Shan Tseng (National Sun Yat-sen University) and Jian-Hwa Hu (National Taiwan Ocean University)
Outline
• Instruments;
• Experiment design;
• Summary of observations;
• Non-linearity;
• Summary (and future plans).
INSTRUMENTS FOR NLIW EXPERIMENT: 4 drifters with
thermistor and pressure chain (20 sensors) , ADCPs, GPS and
ARGOS
Summary of observations
First deployment, leg1,05/02/2005
Second deployment, leg 2, 05/07/2005
xxxx
South
China
Sea
Luzon
Taiwan
Summary of observations: trajectories of SVP drifters and absolute sea level
Summary of observations: trajectories of SVP drifters (blue) and T-chains (red).
Summary of observations
T chain record, legs 1 & 2
Summary of observations: wave packet and lift of chain
38 kHz Echo Sounder att. and T contour (T-Chain)
8.1 8.15 8.2 8.25 8.3 8.35 8.4
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0. 8
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. 5
25
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.5Day of May 2005
m/s
1 1 2 2 4
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Day of May 2005
m/s
1 1 2 2 8.4
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0. 1
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Day of May 2005
m/s
8.1 8.15 8.2 8.25 8.3 8.35 8.4
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8.1 8.15 8.2 8.25 8.3 8.35 8.4
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Day of May 2005
8.1 8.15 8.2 8.25 8.3 8.35 8.4
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0. 8
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Day of May 2005
u
v
w
tuzu
w
tvzv
w
t
wz
ww
Nonlinearity. Acoustic current meters profiles: buoy 56415, leg2
1 1 1 4 1 4 1 1 1
0
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0. 1
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Day of May 2005
m/s
1 1 1 4 1 4 1 1 1
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27.5
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.5
Day of May 2005
m/s
u
v
w
tuzu
w
tvzv
w
t
wz
ww
Nonlinearity. Acoustic current meters profiles: buoy 56415, leg2
10.3 10.35 10.4 10.45 10.5 10.55 10.6
0
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0. 4
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Day of May 2005
m/s
10.3 10.35 10.4 10.45 10.5 10.55 10.6
0
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Day of May 2005
10.3 10.35 10.4 10.45 10.5 10.55 10.6
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Day of May 2005
10.3 10.35 10.4 10.45 10.5 10.55 10.6
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Day of May 2005
Summary
• Maps of absolute sea-level are helpful in planning the experiment;
• Acceleration: vertical advection terms in horizontal momentum equations are of same order of the linear terms;
• Future plans. Next experiment should try to address the following issues: a) modification of waves along their path; b) measure of horizontal advective terms (closely spaced array);
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