regional rainfall measurements using passive aquatic listener during spurs field campaign jie yang,...
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![Page 1: Regional rainfall measurements using Passive Aquatic Listener during SPURS field campaign Jie Yang, Stephen C. Riser, Jeffrey A. Nystuen, William E. Asher,](https://reader035.vdocuments.net/reader035/viewer/2022062320/56649d085503460f949d9a4d/html5/thumbnails/1.jpg)
Regional rainfall measurements using Passive Aquatic Listener during SPURS
field campaign
Jie Yang, Stephen C. Riser, Jeffrey A. Nystuen, William E. Asher, and Andrew T. Jessup
2014 Aquarius/SAC-D Science Team Meeting
November 11 – 14, 2014, Seattle, Washington USA
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Outline
• Passive Aquatic Listener (PAL) calibration using 6-year Ocean Station PAPA data
• Rainfall measurements using PAL during SPURS1) Rain rate and wind speed results during SPURS
2) Rainfall seasonal and intra-annual variability
3) Implication of rainfall measurements on salinity
• Summary and future work
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PAL working mechanism and calibration
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Drizzle
Wind only
Light rain followed by heavy downpour
Spectrogram using PAL OSP data
Feb. 11–12, 2008
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Jul Aug Sep Oct Nov Dec
4
6
8
10
12
14
16
Date (2007)
Win
d sp
eed
(m
/s)
NoaaPAL
Comparison of wind speed between PAL
and anemometer
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Comparison of rainrate
between PAL and in situ rain gauge
Jul Aug Sep Oct Nov Dec0
5
10
15
20
Date (2008)
Ra
in r
ate
(m
m/h
r)
PALNoaa
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PAL Rain accumulation using 6-year
OSP data
0 500 1000 1500 20000
500
1000
1500
2000
2500
JD (2007)
RA
(m
m)
PAL SPL1dBPAL mean
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Comparison of rain
accumulation between PAL
and in situ rain gauge
0 500 1000 1500 20000
500
1000
1500
2000
2500
JD (2007)
RA
(m
m)
PAL SPL1dBPAL meanNoaa, cutoff 0.1mm/hrNoaa, cutoff 0.4mm/hr
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Rainfall measurements during SPURS
Figure: Jessica Anderson
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Oct Nov Dec Jan 13 Feb Mar Apr May0
2
4
6
8
10
12
14
Date
Win
d sp
eed
(m
s)
central mooringFloat 7587
Float 7587
Comparison of wind speed between PAL and central mooring
Float 7587 end position: ~200 km away from central mooring
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Float 7587
Float 7547
Float 7582
Float 7607
0 100 200 300 4000
100
200
300
400
500
600
700Float 7547
JD (2013)R
A (
mm
)0 100 200 300 400
0
100
200
300
400
500
600
700
RA
(m
m)
Float 7582
JD (2013)
0 100 200 300 4000
100
200
300
400
500
600
700Float 7587
JD (2013)
RA
(m
m)
0 100 200 300 4000
100
200
300
400
500
600
700Float 7607
JD (2013)
RA
(m
m)
0 200 4000
200
400
600
RA
(m
m)
Float 6923
0 200 4000
200
400
600
Float 7547
0 200 4000
200
400
600
Float 7569
0 200 4000
200
400
600
Float 7572
0 200 4000
200
400
600
RA
(m
m)
Float 7582
0 200 4000
200
400
600
Float 7587
0 200 4000
200
400
600
Float 7604
0 200 4000
200
400
600
Float 7607
0 200 4000
200
400
600
RA
(m
m)
Float 7635
JD (2013)0 200 400
0
200
400
600
JD (2013)
Float 7660
0 200 4000
200
400
600
JD (2013)
Float 7681
0 200 4000
200
400
600
JD (2013)
Float 7699
PAL SPL1dB PAL mean 3B42
Comparison of rain accumulation between PAL and
3B42Feb. 2013 – Jan. 2014
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Rainfall seasonal and intra-annual variability during SPURS
Sep 12 Dec Mar 13 Jun Sep0
20
40
60
RR
(m
m/h
r)
Day (Start date 9/22/2012)
Sep 13 Dec Mar 14 Jun Sep0
20
40
60
Day (Start date 9/22/2013)
RR
(m
m/h
r)
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Implication of rainfall measurements on salinity
Salinity data: central mooring
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Summary and future work
• PAL has been established to provide reliable estimates of wind speed and rainrate
• Passive acoustic remote sensing can be used to study the spatial variability and intermittency of rainfall and provide regional maps of the surface wind field
• Advantages of passive acoustic technique over conventional meteorological buoy measurement: autonomous, low-cost, long residence time at sea, real-time data access, and excellent temporal and spatial resolutions
• Future
1) regional map of wind and rain field
2) understanding the data better by combining PAL with S/T data on Argo floats and data that characterize vertical and horizontal advection of water in the region