R/V ALIS - TOWED ADCP DATA A. Kaneko (Hiroshima U., Japan) ------------------------------------------------------------------------------- Announced availability: 1 October 1994 Last modified: 24 October 1995 Data Access Towed Acoustic Doppler Current Profiler (ADCP) data are available via anonymous FTP from the Japanese TOGA COARE FTP site at the University of Tokyo (157.82.71.38) in subdirectory /pub/TOGA/ADCP filename adcp_alis.tar. Background The oceanographic cruise EQUALIS, a joint operation between the two international projects JGOFS (Joint Global Ocean Flux Study) and TOGA COARE was organized by the FLUPAC group of the Centre ORSTOM de Noumea, New Caledonia, with participation and collaboration of Japanese and Australian scientists. The cruise was carried out from 3 November through 12 December 1992 (Noumea to Noumea) on board the ORSTOM research vessel ALIS and consisted of two fixed stations at 156 15E, 1 30S (for 10 days from 12 - 22 November 1992) and 156 10E, 1 45S (for 8 days from 27 November - 6 December 1992), interrupted for one day (27/28 November) for intercomparison of meteorological measurements with the Australian research vessel Franklin. Towed ADCP observations were carried out onboard the vessel moving slowly around or anchored on station. The towed body, which includes a 150 kHz RD Instruments' ADCP, was suspended down to shallow depth through a rope from surface floats. The data obtained from the downward looking ADCP were transferred in real time through a RS-422 link to a computer on the Alis. Data File Information Dataset format: ASCII Dataset volume: 43.12MB ADCP observations were often interrupted by electric noise introduced into the RS-422 link. As a result, there are a lot of data gaps often lacking data for several minutes. The longest interruption occurred from 18 November 18:47:06 - 19 November 1992 06:05:37 (UTC). The ADCP used a magnetic compass. The magnetic variation correction of +7.7 degrees has already been applied. The ship positioning was obtained from a GPS. (1) First ADCP observation (file name = als10) Latitude = -1.5 Longitude = 156.25 ADCP Depth: 10 m Depth Bin: 8 m Depth of first bin: 14 m Sampling Time: 1 minute Start Time: 11/11/92 20:39:21 ( UTC ) Alis moving slowly 14/11/92 01:30:00 ( UTC ) Alis anchored End Time: 21/11/92 13:22:58 ( UTC ) (2)Second ADCP observation (file name = als20.asc) Latitude = -1.75 Longitude = 156.167 ADCP Depth: 20 m Depth Bin: 8 m Depth of first bin: 24 m Sampling Time: 1 minute Start Time: 28/11/92 06:17:21 ( UTC ) Alis anchored End Time: 05/12/92 13:14:52 ( UTC ) Data format is the same as that for the first observation. (3)GPS observation (file name = gpsals) Time Interval: 1 minute Start Time: 10/11/92 01:29:35 ( UTC ) End Time: 05/12/92 13:27:28 ( UTC ) Data Format: Year Month Day H:M:S Latitude Longitude Degree Minute Degree Minute File Header Year Month Day H M S Temp(C) Bin North Vel. East Vel. Vertical Vel. Error Vel. AGC Percent Good Number (mm/s) (mm/s) (mm/s) (mm/s) (dB) (%) ---- 19999 for invalid data ---- Data Example 1992 11 11 20 39 21 28.90 1 -69 -78 4 25 181 59 2 -57 24 12 -76 158 59 3 -105 -55 65 37 141 59 4 -153 48 88 52 132 59 5 -88 44 69 5 126 59 6 -206 -47 58 -35 124 59 7 -208 -67 85 -91 127 59 8 -294 -112 73 -94 125 59 9 -369 -280 94 -166 118 59 10 -467 -451 93 -52 113 59 11 -544 -580 91 -32 103 59 12 -518 -562 133 -33 100 59 Please acknowledge Dr. Arata Kaneko at Hiroshima University in any publication using these data. This work was supported by the Japan Ministry of Education, Culture and Science. ------------------------------------------------------------------------------- For more information, please contact: Arata Kaneko Faculty of Engineering Hiroshima University Higashi-Hiroshima 724 Japan email: akaneko@ue.ipc.hiroshima-u.ac.jp Phone: (81)824-24-7625 FAX: (81)824-22-7192 ------------------------------------------------------------------------------- /home/www/data/ocean_large_scale/alis_adcp.html