Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Casting Lowered-ADCP and Data Processing Methods for Configuring Vertical Current Structure

해류 수직구조를 파악하기 위한 LADCP Casting 및 자료처리 방법

  • Kim, Eung (Climate Change & Coastal Disaster Reserach Department, KORDI) ;
  • Jeon, Dong-Chull (Climate Change & Coastal Disaster Reserach Department, KORDI) ;
  • Shin, Chang-Woong (Climate Change & Coastal Disaster Reserach Department, KORDI) ;
  • Kim, Dong-Guk (Climate Change & Coastal Disaster Reserach Department, KORDI)
  • 김응 (한국해양연구원 기후.연안재해연구부) ;
  • 전동철 (한국해양연구원 기후.연안재해연구부) ;
  • 신창웅 (한국해양연구원 기후.연안재해연구부) ;
  • 김동국 (한국해양연구원 기후.연안재해연구부)
  • Received : 2011.07.05
  • Accepted : 2011.09.09
  • Published : 2011.09.30
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Abstract

To understand the vertical structure of ocean currents from raw data observed by lowered-ADCP (LADCP), these data require post-processing. Data were processed using Krahman's version 10.8 processing software based on Matlab. It is estimated the influence of auxiliary data affecting the processed current structure. The bottom-tracked velocities and the GPS information significantly contribute the offset on reference velocities in the bottom layer and barotropic ones in the middle layer, respectively. Good quality data can be obtained when LADCP is least tilted in pitch and roll during observation. In situ application of LADCP to the (northward) volume transports of Kuroshio in the East China Sea proved to be 24.8. Sv (= $1{\times}10^6m^3s^{-1}$) in October 2007, and 28.2 Sv in June 2008, respectively. The volume transport is relatively large over the continental slope when compared to the shelf or the deep sea.

Keywords

References

  1. Andres M, Wimbush M. Park JH, Chang KI, Lim BH. Watts DR, Ichikawa H, Teague WJ (2008) Observations of Kuroshio flow variations in the East China Sea. J Geophys Res, 113:C05013. doi:10.1029/2007JC004200
  2. Beardsley RC, Limeburner R, Yu H, Cannon GA (1985) Discharge of the Changjiang (Yangtze River) into the East China Sea. Cont Shelf Res 4(1/2):57-76 https://doi.org/10.1016/0278-4343(85)90022-6
  3. Casal TGD, Beal LM, Lumpkin R (2006) A North Atlantic deep-water eddy in the Agulhas Current system. Deep-Sea Res II 53:1718-1728
  4. Firing E (1998) Lowered ADCP Developments and Use in WOCE. WOCE Newsletter 30:10-14
  5. Fisher J, Visbeck M (1993) Deep Velocity Profiling with Self-contained ADCPs. J Atmos Ocean Tech 10:764-773 https://doi.org/10.1175/1520-0426(1993)010<0764:DVPWSC>2.0.CO;2
  6. Guo X, Miyazawa Y, Yamagata T (2006) The Kuroshio Onshore Intrusion along the Shelf Break of the East China Sea: The Origin of the Tsushima Warm Current. J Phys Oceanogr 36:2205-2231 https://doi.org/10.1175/JPO2976.1
  7. Ichikawa H, Beardsley RC (2002) The current system in the Yellow and East China Sea. J Oceanogr 58:77-92 https://doi.org/10.1023/A:1015876701363
  8. Komaki K, Kawabe M (2008) Correction method for fulldepth current velocity with lowered acoustic Doppler current profiler (LADCP). J Oceanogr 63:995-1007
  9. Krahmann G (2009) Lowered ADCP users group. http:// tech.groups.yahoo.com/group/ladcp/. Accessed 14 Jul 2011
  10. Kune E, Firing E, Hukkon JM, Chereskin TK, Thurnherr AM (2006) Global Abyssal Mixing Inferred from Lowered ADCP Shear and CTD Strain Profiles. J Phys Oceanogr 36:1553-1576 https://doi.org/10.1175/JPO2926.1
  11. Park YH, Fuda JL, Durand I, Garabato ACN (2008) Internal tides and vertical mixing over the Kerguelen Plateau. Deep-Sea Res II 55:582-593 https://doi.org/10.1016/j.dsr2.2007.12.027
  12. Polzin K, Kunze E, Hummon J, Firing E (2002) The Finescale Response of Lowered ADCP Velocity Profiles. J Atmos Ocean Tech 19:205-224 https://doi.org/10.1175/1520-0426(2002)019<0205:TFROLA>2.0.CO;2
  13. RDI (1996) Acoustic Doppler Current Profiler: principles of operation a practical primer. RDI Instruments, 52 p
  14. Rhein M, Kirchner K, Mertens C, Steinfeldt R, Walter M, Wischnath UF (2005) Transport of South Atlantic water through the passages south of Guadeloupe and across ${16^{\circ}N}$ 2000-2004. Deep-Sea Res I 52:2234-2249 https://doi.org/10.1016/j.dsr.2005.08.003
  15. Song J, Xue H, Bao X, Wu D, Chai F, Shi L, Yao Z, Wang Y, Nan F, Wan K (2011) A spectral mixture model analysis of the Kuroshio variability and the water exchange between the Kuroshio and the East China Sea. Chinese J Ocean Limnol 29(2):446-459 https://doi.org/10.1007/s00343-011-0114-7
  16. Thurnherr AM (2005) LADCP Processing. http://www. ldeo.columbia.edu/-ant/LADCP/. Accessed 14 Jul 2011
  17. Thurnherr AM (2008) How To Process LADCP Data With the LDEO Software. ftp://ftp.ldeo.columbia.edu/pub/ LADCP/HOWTO/how-to.pdf. Accessed 14 Jul 2011
  18. Thurnherr AM, Reverdin G, Aubertot PB, Laurent LCS, Vangriesheim A, Ballu V (2008) Hydrography and flow in the Lucky Strike segment of the Mid-Atlantic Ridge. J Marine Res 66:347-372 https://doi.org/10.1357/002224008786176034
  19. Torres DJ, Millard RC, Swartz HM, Toole JM (2000) A Comparison of LADCP and CTD Performance on a Slide-Down-Wire Frame Versus a Standard CTD Frame. In: OCEANS 2000 MTS/IEEE Conference and Exhibition, Rhode Island, USA 11-14 September 2000, pp 359-366 https://doi.org/10.1109/OCEANS.2000.881285
  20. Visbeck M (2002) Deep velocity profiling using lowered Acoustic Doppler Current Profilers: bottom track and inverse solutions. J Atmos Ocean Tech 19:794-807 https://doi.org/10.1175/1520-0426(2002)019<0794:DVPULA>2.0.CO;2