magdalena andres 1, jae-hun park 1, mark wimbush 1, kyung il chang 2, hiroshi ichikawa 3 1 graduate...
TRANSCRIPT
![Page 1: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/1.jpg)
Magdalena Andres1, Jae-Hun Park1, Mark Wimbush1,
Kyung Il Chang2, Hiroshi Ichikawa3
1 Graduate School of Oceanography, University of Rhode Island2 School of Earth and Environmental Sciences, Seoul National University3 Institute of Observational Research for Global Change, JAMSTEC
May 24, 2007 The 14th PAMS/JECSS Workshop
![Page 2: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/2.jpg)
Observational highlights of Kuroshio in the ECS
Introduce study area and instruments Velocity
mean cross-section depth of maximum velocity near-bottom velocity time series
Transport: mean time series spectrum
![Page 3: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/3.jpg)
Study area (Dec. 2002 – Nov. 2004)
East China Sea
Near PN-line
![Page 4: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/4.jpg)
Study area
East China Sea
Near PN-line
PIES & CPIES 23 months
ADCPs13 months(K.I. Chang)
![Page 5: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/5.jpg)
Emits 12 kHz sound pulses at sea floor
Measure (hourly): : echo time from surface P: bottom pressure V: deep horizontal current
Calculate: geostrophic shear from (using dynamic height
inferred from a lookup table) deep geostrophic flow from P reference deep flow with the current, V
ABSOLUTE VELOCITY AND TRANSPORT
CPIES( Current- Pressure- sensor-equipped Inverted Echo Sounder)
VVV
V
![Page 6: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/6.jpg)
Recirculation
Subsurface velocity core
13-month mean absolute velocity
Countercurrent
Schematic Plan view:Cross-section:
![Page 7: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/7.jpg)
Depth of maximum velocity
53%0.4 – 2.0 m/s
47%0.3 – 1.1 m/s
Bimodal distribution
![Page 8: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/8.jpg)
Near-bottom velocity 23-monthmeans:
C1C6
![Page 9: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/9.jpg)
Transport component
24.0 Sv
-0.5 Sv
-4.9 Sv
Positive flow, countercurrent, recirculation
![Page 10: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/10.jpg)
28.9 Sv
3.8 Sv
Net transport
18.5 Sv
![Page 11: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/11.jpg)
Absolute Velocity (m/s)
Net Transport
![Page 12: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/12.jpg)
Net transport spectrum
![Page 13: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/13.jpg)
Net transport spectrum 11 day
James et al., 1999 Fastest growing
instability – spectral model
15 day Johns et al., 2001 Inflow east of
Taiwan
64 day K.I. Chang, B.-H.
Lim, J.-H. Park Related to winds
over ECS
![Page 14: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/14.jpg)
Summary of Observational highlights Mean velocity cross-section
Positive (northeastward flow) Countercurrent (along slope beneath positive flow) Recirculation (off-shore of positive flow)
Near-bottom velocity Positive flow extends to bottom 50-100 km seaward of shelfbreak Persistent countercurrent along slope High frequency variability on the upper slope
Transport Mean:
Net: 18.5 Sv (mse = 0.8 Sv; 4.0 Sv) Positive: 24.0 Sv (mse = 0.9 Sv; 4.4 Sv) Recirculation: -4.9 Sv (mse = 0.3 Sv; 1.8 Sv)
Range in net transport: 4 – 29 Sv
Spectral characteristics 64, 15, 11 day peaks in transport
![Page 15: Magdalena Andres 1, Jae-Hun Park 1, Mark Wimbush 1, Kyung Il Chang 2, Hiroshi Ichikawa 3 1 Graduate School of Oceanography, University of Rhode Island](https://reader035.vdocuments.mx/reader035/viewer/2022062511/551c1ef5550346a34f8b5a6f/html5/thumbnails/15.jpg)
Many thanks to the following individuals and organizations…
Karen Tracey Gerry Chaplin Capt. Sadao Ishida and the crew aboard the R/V Yokosuka of
JAMSTEC Capt. Bong-Won Lee and the crew aboard the R/V Onnuri of KORDI Capt. Sunao Masumitsu and the crew aboard the T/V Kagoshima-
maru of Kagoshima University Capt. Jeoung Chang Kim and the crew aboard the R/V Tamyang of
Pukyong National University CTD data used in the GEM calculations were kindly provided by the
Nagasaki Marine Observatory, Japan Meteorological Agency ONR KORDI JAMSTEC NRL URI/GSO PAMS/JECCS Organizing Committee