A new drifting device to measure internal waves in the upper ocean by Luca Centurioni and Peter Niiler lcenturioni@ucsd.edu Scripps Institution of Oceanography,
Post on 01-Apr-2015
212 Views
Preview:
Transcript
A new drifting device to measure internal waves in the upper ocean
byLuca Centurioni and Peter Niiler
lcenturioni@ucsd.edu
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
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
15
15
17.5
17
.5
20
22
.5 22
. 5
25
27
.5Day of May 2005
m/s
1 1 2 2 4
0
20
40
60
80
100
120
140
160
180
200
0. 4
0. 3
0. 2
0. 1
0
0.1
0.2
0.3
0.4
15
15
17.5
17.5
20
22.5 2
2.5
25
27.5
Day of May 2005
m/s
1 1 2 2 8.4
0
20
40
60
80
100
120
140
160
180
200
0.15
0. 1
0.05
0
0.05
0.1
0.15
15
15
17.5
17.5
20
22.5 2
2.5
25
27.5
Day of May 2005
m/s
8.1 8.15 8.2 8.25 8.3 8.35 8.4
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
0.6
0.8
15
15
17.5
17
.5
20
22
.5 22
.5
25
27
.5
Day of May 2005
8.1 8.15 8.2 8.25 8.3 8.35 8.4
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
0.6
0.8
Day of May 2005
8.1 8.15 8.2 8.25 8.3 8.35 8.4
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
0.6
0.8
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
20
40
60
80
100
120
140
160
180
200
0.15
0. 1
0.05
0
0.05
0.1
0.15
15
17.5
17.5
20
20
20
20
202
0
22.5
22
.5
22.5
25
25
25
27.5
27.5
27
.5
Day of May 2005
m/s
1 1 1 4 1 4 1 1 1
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
15
17.5
17.5
20
20
20
20
202
0
22.5
22
.5
22.5
25
25
25
27.5
27.5
27
.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
20
40
60
80
100
120
140
160
180
200
0. 4
0. 3
0. 2
0. 1
0
0.1
0.2
0.3
0.4
15
17
.5
17
.5
20
20
20
20
202
0
22
.5
22
.5
22
.5
25
25
25
27
.5
27
.5
27
.5
Day of May 2005
m/s
10.3 10.35 10.4 10.45 10.5 10.55 10.6
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
0.6
0.8
15
17
.5
17
.5
20
20
20
20
202
0
22
.5
22
.5
22
.5
25
25
25
27
.5
27
.5
27
.5
Day of May 2005
10.3 10.35 10.4 10.45 10.5 10.55 10.6
0
20
40
60
80
100
120
140
160
180
200
0. 8
0. 6
0. 4
0. 2
0
0.2
0.4
0.6
0.8
15
17
.5
17
.5
20
20
20
20
202
0
22
.5
22
.5
22
.5
25
25
25
27
.5
27
.5
27
.5
Day of May 2005
10.3 10.35 10.4 10.45 10.5 10.55 10.6
0
20
40
60
80
100
120
140
160
180
200
1. 5
1
0. 5
0
0.5
1
1.5
15
17
.5
17
.5
20
20
20
20
202
0
22
.5
22
.5
22
.5
25
25
25
27
.5
27
.5
27
.5
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);
top related