P18 bathymetry (4/30/2002): ASCII navigation and bathymetry data files for the three legs of P18 were obtained from Gregory Johnson, NOAA/PMEL, 11/12/98. WOCE designation: P18 (legs 2 and 3 make the section) EXPOCODE 31DSCG94_2 31DSCG94_3 (31DSCG94_1) Chief scientist: Leg 2: Bruce Taft, NOAA/PMEL Leg 3: Gregory Johnson, NOAA/PMEL (Leg 1: Andrew Dickson, SIO) Ship: R/V Discoverer Ports of call: Leg 2: Punta Arenas, Chile to Easter Island Leg 3: Easter Island to San Diego, CA Cruise dates: Leg 2: Feb 22 - March 24, 1994 Leg 3: March 29 - April 27, 1994 "P18leg1.all", "P18leg2.all", "P18leg3.all" are the three original data files, NOAA format. Depths are 10-minute averages, uncorrected depths, assuming 1500 m/sec soundspeed (see format description below). "P18leg2_edit.all", "P18leg3_edit.all" same but with spikes due to data gaps removed "P18leg1_cor.txt", "P18leg2_cor.txt", "P18leg3_cor.txt" are the three original data files, NOAA format. Depths are 10-minute averages, corrected depths. Same format as p18..all. "P18leg2_cor_edit.txt", "P18leg3_cor_edit.txt" same but with spikes due to data gaps removed "P18_1_bathy_gdc.dat", "P18_2_bathy_gdc.dat", "P18_3_bathy_gdc.dat" are in Geological Data Center format and include corrected depths at all recorded locations. Original unedited data. "P18_2_bathy_gdc_edit.dat", "P18_3_bathy_gdc_edit.dat" Same, but with spikes edited out. "P18leg2_dec.txt" "P18leg3_dec.txt" Reformatted subsets of Legs 2 and 3, used for section plotting All steaming reversals removed, filler depths removed (0 and -99), all points with ship speed less than 2 knots removed "P18_bathydist.dat" is the decimated bathymetry file, projected onto straight lines between station positions, used for plotting the vertical sections. "P18_sta_bdep.dat" is the station list, with corrected bottom depths as taken from the P18su.txt file (station summary file) ----------------------------------------------- Format specifications Ascii Navigation format for "P18_bathy_gdc.dat" latitude (xxx.xxx) longitude (xxxx.xxx) unc depth (xxxxx.x) meters corr depth (xxxxx.x) meters month (ii) day (iii) day of the month year (ii) assuming 1900 century hour (ii) minute (ii) second (ii) Julian date (xxxxxxx.xxxxx) Format of "P18_bathydist.dat" and "P18legn_dec.txt" ist (iii) station number (set to 1) dist (ffffff.f) distance (km) along section (for bathydist) lat (dddddd.mm) decimal latitude lon (dddddd.mm) decimal longitude dpt (ddddd.d) depth meters Format of P18_sta_bdep.dat station (iiii) station number distance (xxxxx.x) km along section latitude (xxx.xxx) longitude (xxxx.xxx) pressure (xxxx.x) dbar OR depth in meters ----------------------------------------------- Notes on data: Leg1: many missing positions (lat/lon) Leg 1: bathymetry data are noisy, did not clean them up since they are not used for the P18 section Leg 2: bathymetry data are noisy. Almost all noise arises from frequent gaps in record (0.0 depth), with biased low depths in the point on either side, suggesting that 0.0 was averaged in with good depths in the 10-minute average on either side of the gaps. When the gap was filled with -99 (one instance), then the average was biased to a large depth. Went through complete record that matches with the P18 section (northward bound portion of leg 2) and removed bad values from either side of gap. See list at end for 129 removed lines. Only one spike other than these associated with data dropouts. At end of leg, the ship went into port. Seamount around -26.2S looks OK - duplicated Leg 3: bathymetry data are clean. Removed one line, associated with gap at beginning of record: 88.222 -25.501 -103.028 2226 24.382 53.825 36.058 1016.315 113.583 12.436 ----------------------------------------------- Notes from Greg Johnson (11/98): These underway data are from the WOCE cruise P18 on the NOAA Ship DISCOVERER in January-April 1994. The Chief Scientist for Leg 1 was Andrew Dickson, for leg 2 was Bruce Taft, and for leg 3 was Gregory Johnson. The files are ASCII files, with fields delimited by spaces. There is one file for each leg. They are name leg1.all, leg2.all, and leg3.all. They contain 10-minute averages of the following quantities from the WOCE P18 cruise in 1994: JD/GMT Latitude Longitude Narrow Beam Depth (uncorrected m) TSG SST (C) TSG Conductivity (mmho/cm), TSG salinity (pss) Barometric pressure (mbar) True wind direction True wind speed (kt) Reading the data from the raw tapes and computing 10 minute averages was done by Cathy Cosca at the NOAA Pacific Marine Environmental Laboratory. Missing or bad values are denoted by -99. No effort has been made to clean up the data. The Lat and Lon are from GPS. The narrow beam depth is from the narrow beam of a Seabeam instrument, assuming a 1500 m/s sound-speed. There may be problems with depth values where the ship is on station (stopped) because of acoustic interference from instruments on the rosette frame. Thermo-SalinoGraph (TSG) temperature, conductivity, and salinity were measured with a SeaBird Electronics TSG Model SBE-21, S/N 940. The unit was calibrated on 11 January 1994 directly prior to the ship's departure from Seattle. Bottle data were taken periodically during the cruise for the purpose of in situ calibration of the TSG salinities and conductivities, but this exercise has not been performed. There is no documentation on the barometric pressure readings except that they originate from a SEAS Met Package. The winds were measured by a Bendix Anemometer and then processed from relative to true by the SEAS software. ------------------------------------------------ Leg 2 lines removed (see above) 4/30/01 LDT: 56.10420 -58.32666 -84.75608 3109.200 6.687941 34.27434 34.19947 979.3072 337.6025 28.53373 57.01390 -61.66632 -91.05493 1534.438 3.921719 31.66045 34.01960 977.0101 319.1173 18.06832 57.10420 -62.06369 -91.90002 2832.737 3.847964 31.60869 34.03477 976.1075 61.67864 3.486623 58.01390 -66.25550 -101.1677 2174.200 1.963098 29.75063 33.75181 987.6433 238.8458 20.60907 58.10420 -66.66087 -102.1895 2731.857 1.815590 29.52429 33.62493 987.1157 267.7371 14.24887 58.65280 -66.99982 -103.0057 4192.150 2.240590 29.80918 33.53032 992.9534 232.2434 19.86695 58.73610 -66.99519 -103.0048 4063.250 2.237275 29.78766 33.50708 994.2084 252.2419 17.18665 59.01390 -66.49724 -103.0089 2164.850 1.691327 29.42871 33.63712 996.0043 319.6553 14.75103 59.10420 -66.50151 -103.0042 2882.800 1.726211 29.45312 33.63066 995.5234 318.9125 16.56623 59.13190 -66.49992 -102.9578 5060.850 1.731722 29.45301 33.62464 995.4943 319.0902 15.20288 59.31250 -66.01051 -103.0071 2811.650 1.623221 29.39754 33.67062 994.8215 325.9286 24.53635 59.37500 -66.00116 -102.9993 2325.800 1.649279 29.43661 33.69212 994.2144 327.7906 25.11442 59.60420 -65.50087 -102.9969 4409.600 2.058520 29.83230 33.75228 994.1844 324.4966 29.16733 59.66670 -65.49895 -102.9991 4160.400 2.044948 29.81162 33.74089 993.9400 320.5007 21.58369 59.91670 -65.00247 -102.9906 471.2381 2.638858 30.42028 33.86527 993.9286 334.4254 21.26360 60.11110 -65.00620 -103.0106 1827.200 2.630043 30.34108 33.77716 992.2768 332.4308 18.66474 60.22920 -64.50089 -103.0051 3983.100 2.669211 30.47963 33.90617 990.6000 22.88998 18.55599 60.29170 -64.49899 -102.9868 1929.450 2.659154 30.47620 33.91261 989.0450 24.05310 22.76940 60.53470 -63.99890 -103.0117 1015.600 2.799624 30.61910 33.93938 981.8300 29.98677 26.80957 60.69440 -63.97024 -103.0174 3198.684 2.807261 28.82880 31.80404 977.9750 27.41424 29.85128 60.96530 -63.50184 -103.0034 3633.900 2.723377 29.31159 32.43739 970.8300 44.32865 30.73731 61.10420 -63.49860 -102.9991 3292.650 2.650876 29.92574 33.24901 967.7272 29.41880 27.37140 61.29170 -62.98537 -102.9828 2231.250 3.288717 30.52280 33.31352 966.6328 313.2093 30.46861 61.35420 -63.00219 -102.9823 3533.450 3.346494 30.98721 33.81278 966.9972 345.7337 30.26271 61.60420 -62.49724 -102.9958 2324.650 3.437017 31.15840 33.92422 972.4157 338.6389 22.48402 61.67360 -62.49440 -103.0082 1775.000 3.447127 31.20778 33.97312 973.4943 348.8370 16.92153 62.10420 -61.94141 -103.0032 3190.428 3.602945 30.95384 33.50816 976.0229 60.05725 9.338580 62.20830 -61.50642 -102.9795 1284.350 4.654510 32.26992 33.98024 975.3014 118.8579 7.897790 62.27780 -61.48400 -102.9894 1149.500 4.648386 32.27003 33.98665 974.8785 141.0433 10.17805 62.51390 -61.00206 -102.9839 3655.600 4.481380 32.11575 33.97795 972.4786 165.1528 24.33720 62.58330 -61.00911 -103.0044 1242.650 4.456386 32.10275 33.98846 972.2350 166.5467 24.04777 62.82640 -60.50635 -102.9724 1311.400 5.639965 33.24776 34.10155 969.0015 146.8414 20.28882 62.89580 -60.51470 -102.9519 1002.900 5.645993 33.24735 34.09498 969.1372 120.8867 17.54593 63.00690 -60.50462 -103.0079 4442.235 5.702879 33.31140 34.11015 968.8080 139.2415 23.06973 63.10420 -60.05793 -103.0023 1801.100 5.666705 33.31266 34.14826 967.0934 145.7060 23.55054 63.43750 -59.49341 -103.0146 3878.350 5.626548 33.18162 34.03989 962.1301 181.5066 24.68875 63.50690 -59.50514 -103.0293 4634.850 5.604017 31.92501 32.66808 960.9399 177.7631 23.83837 63.78470 -58.99829 -102.9758 4640.050 5.641576 30.29425 30.83944 957.5134 217.8154 31.81884 63.84720 -58.99691 -103.0215 2703.000 5.624159 31.38830 32.04480 957.3450 223.9284 33.94446 64.13190 -58.58199 -103.0014 6396.000 5.527618 33.16167 34.11747 958.0200 214.3947 34.28972 65.03470 -57.84698 -103.0508 1020.350 -99.00000 -99.00000 -99.00000 972.9207 172.5778 24.57258 65.18750 -57.16262 -103.0037 351.9474 -99.00000 -99.00000 -99.00000 976.2755 189.7693 34.08927 65.26390 -57.17152 -103.0012 1807.900 5.830271 33.17998 33.83288 978.0974 192.5064 34.10571 66.71530 -56.50892 -103.0931 2203.350 6.388701 31.38684 31.34420 999.6353 214.7537 28.25242 66.78470 -56.53328 -103.0750 630.0000 6.391891 31.80685 31.78677 1000.507 222.2464 27.74668 67.00000 -55.82923 -102.9872 47.85000 6.022601 32.22045 32.58524 1004.000 219.4839 24.73585 67.15280 -55.82170 -103.0051 3531.350 6.046989 33.06229 33.48900 1007.010 206.1729 19.39819 67.28470 -55.16079 -102.9882 2451.600 6.924655 34.44135 34.14812 1010.048 203.1092 22.47898 67.35420 -55.17070 -102.9929 4446.100 6.933559 33.38827 33.00465 1011.694 199.4795 25.04272 67.68750 -54.49869 -102.9993 2203.050 7.914016 35.32229 34.13107 1018.525 198.3322 15.09328 67.78470 -54.49895 -102.9997 1663.550 7.920491 35.48668 34.30126 1019.428 220.5356 13.99842 67.93750 -53.83262 -102.9963 3274.450 7.835283 35.40565 34.29784 1020.756 223.9338 11.28381 68.04170 -53.83385 -102.9983 2818.350 7.821905 35.40835 34.31392 1021.036 242.4677 12.03487 68.17360 -53.20429 -103.0003 2367.550 8.086813 35.64375 34.30654 1021.985 233.0204 15.97113 68.34720 -53.16816 -103.0475 1459.000 8.041756 35.60464 34.30882 1021.139 281.6523 13.57220 68.47920 -52.49803 -102.9980 3183.400 8.062040 35.63251 34.31880 1020.949 282.6154 17.29473 68.63890 -52.49749 -103.0090 1685.095 8.061793 35.63990 34.32695 1020.011 289.3994 13.60923 68.81940 -51.82929 -102.9937 2321.737 8.588112 36.12445 34.32851 1019.974 267.7406 13.95868 69.02780 -51.18028 -102.9790 2979.900 9.261182 36.70341 34.28482 1019.862 230.0976 12.34770 69.09720 -51.16632 -103.0007 570.6000 9.258532 36.70008 34.28391 1019.665 239.2581 10.33319 69.25690 -51.13991 -103.0094 1941.450 9.243677 36.68645 34.28400 1019.733 241.3885 11.63597 69.37500 -50.49846 -103.0076 2773.900 8.991091 36.47203 34.30361 1019.885 235.6902 10.90147 69.52780 -50.49955 -103.0109 1494.700 8.946249 36.42791 34.30072 1019.697 268.6178 9.216073 69.72920 -49.83064 -102.9898 3679.750 9.457883 36.85520 34.25362 1020.464 273.4503 11.43051 69.85420 -49.82132 -103.0037 419.1500 10.13335 37.46347 34.23505 1020.156 301.0108 9.408255 69.96530 -49.24414 -102.9967 2070.750 10.33128 37.64639 34.23380 1019.871 313.9395 4.736582 70.09030 -49.16005 -103.0054 2311.800 10.37828 37.68875 34.23236 1019.076 298.2502 7.825860 70.27080 -48.49848 -102.9981 1759.000 10.50675 37.79936 34.22318 1019.087 331.0633 10.28988 70.36110 -48.50012 -103.0005 1537.632 10.26553 37.58949 34.23815 1018.690 323.9530 9.861573 70.52080 -47.99700 -103.0038 2684.684 10.57106 37.83538 34.19905 1018.519 329.8358 12.51388 70.77780 -47.50760 -102.9979 3426.400 10.69069 37.94952 34.20163 1017.971 28.07992 15.04329 71.02080 -46.99877 -102.9957 2428.381 10.81785 38.08917 34.22260 1014.641 19.08103 18.65636 71.07640 -46.99961 -102.9955 1888.200 10.79432 38.06826 34.22369 1014.128 15.09402 20.08034 71.25000 -46.50446 -102.9970 1559.000 11.01134 38.26192 34.21442 1012.119 24.46449 25.09015 71.38890 -46.48948 -102.9935 2169.250 11.09493 38.33155 34.20585 1009.105 15.87613 30.33510 71.83330 -45.49350 -103.0006 1667.350 11.76356 36.68205 32.02699 996.9031 20.81933 39.14391 72.15970 -45.00703 -102.9937 2358.050 12.34818 39.19516 33.90282 996.6782 328.4346 20.90315 72.27780 -44.98881 -103.0039 447.1905 12.32641 38.45992 33.21735 996.2050 248.3846 24.82089 72.41670 -44.49549 -102.9991 955.5000 13.06672 40.07452 34.09460 994.9143 197.9648 20.54638 72.59720 -44.20453 -102.9984 1945.300 13.08862 36.83310 31.03559 996.0480 351.5780 22.75811 72.69440 -44.00137 -103.0001 1882.450 13.15378 40.15364 34.09135 996.6166 284.0688 18.97874 72.95140 -43.51287 -103.0093 3221.050 13.39477 40.40859 34.11607 995.8619 79.13350 14.76931 73.00000 -43.49997 -103.0142 2066.900 13.40842 40.42942 34.12345 996.0843 7.368182 15.75559 73.19440 -43.00284 -103.0015 2539.900 13.63286 40.60983 34.09236 997.4066 46.16428 12.80638 73.24310 -43.00414 -102.9992 1653.850 13.62752 40.62379 34.11020 997.6601 28.77338 13.13392 73.50000 -42.49161 -102.9924 1139.100 13.68420 40.68708 34.11894 998.6082 40.10409 9.254423 73.72920 -41.99709 -103.0078 3063.952 13.90713 40.89333 34.11306 1000.186 58.44160 9.036533 73.84720 -41.93063 -102.9841 1447.600 14.12157 40.93255 33.95995 1000.501 59.53827 9.445431 73.93060 -41.50941 -102.9984 1559.200 15.09083 41.95808 34.05009 1000.479 210.6067 3.936100 74.15970 -41.49422 -102.9921 3393.579 15.19974 42.06471 34.05187 1003.181 144.7517 10.96984 74.34720 -40.99875 -103.0029 202.4500 15.89621 42.74693 34.06167 1003.658 131.0003 10.80907 74.56250 -41.02103 -102.9999 2235.650 15.79183 42.65934 34.07350 1005.115 110.7813 9.060402 74.74310 -40.50410 -102.9926 392.5000 15.70698 42.57593 34.07217 1006.615 212.0270 4.274625 75.41670 -39.00274 -103.0078 1913.100 18.00156 44.70481 33.98434 1007.340 259.2619 4.002320 75.45830 -38.99929 -103.0035 2108.700 17.97651 44.68055 33.98453 1007.492 243.3293 9.676435 75.70830 -38.50859 -103.0011 2239.250 18.80646 45.54674 34.02851 1007.454 301.0845 13.24202 75.80560 -38.49319 -103.0016 2087.750 18.88510 45.63363 34.03645 1005.774 312.5156 18.22766 76.38890 -37.00146 -102.9840 722.6500 19.70843 46.53799 34.11167 1002.838 261.5577 33.02411 76.41670 -36.99684 -102.9881 1798.500 19.66386 43.68116 31.82909 1002.982 263.0798 27.87673 76.46530 -36.99434 -103.0061 2733.800 19.58402 46.22388 33.95465 1003.457 262.0937 33.61148 76.70140 -36.49886 -103.0000 2499.050 19.83433 46.31674 33.82930 1007.004 259.4288 29.13044 76.79860 -36.48438 -103.0315 620.8000 19.86120 46.72183 34.13812 1008.147 247.0241 26.83907 77.16670 -35.50257 -103.0000 960.7500 19.82567 46.64616 34.10501 1011.189 279.0303 19.08313 77.26390 -35.50359 -103.0006 919.1000 19.80580 46.64585 34.12091 1011.217 267.9651 18.90989 77.37500 -35.00382 -102.9931 2878.700 20.31440 47.17515 34.14022 1011.352 294.3209 13.95363 77.41670 -34.99862 -103.0035 539.4500 20.35078 47.22695 34.15284 1011.041 303.3365 12.93824 77.61810 -34.50888 -102.9995 980.7619 20.60239 47.61040 34.25977 1012.271 317.8287 14.41105 77.74310 -34.50330 -102.9858 1760.200 20.66133 47.66470 34.25600 1012.313 317.6103 18.42891 77.88890 -33.99835 -102.9875 2917.200 20.81795 47.86044 34.28726 1011.355 309.6408 19.17490 77.94440 -34.00761 -103.0115 92.35000 20.89248 47.99814 34.33778 1010.729 299.2994 21.16703 78.31940 -33.00318 -102.9962 952.5500 22.00155 50.11590 35.12413 1011.811 305.9125 25.03403 78.36110 -32.99491 -103.0003 3341.750 22.00895 50.12319 35.12387 1011.272 303.2617 25.03392 78.54860 -32.49988 -102.9981 179.8500 22.15793 50.13014 35.00875 1013.319 223.8056 16.70865 78.69440 -32.50133 -103.0016 1258.900 22.13138 50.08895 34.99786 1015.377 250.2216 15.75148 78.81940 -31.99755 -102.9794 3104.800 22.65907 51.13906 35.39179 1015.227 232.2932 14.75482 78.93750 -31.99626 -103.0363 2743.300 22.66561 51.19110 35.42699 1014.937 214.6185 10.83216 79.29170 -31.00200 -103.0066 1054.100 23.15089 51.82015 35.52148 1016.782 183.5319 10.18206 79.52780 -30.50123 -103.0105 2263.750 23.23359 51.71855 35.37660 1016.439 191.5647 10.63707 79.66670 -30.48594 -103.0074 2441.750 23.26072 51.76067 35.38721 1017.865 191.3399 8.913941 80.43750 -29.48095 -102.9870 2755.900 23.30414 51.82273 35.40003 1017.667 163.1173 11.67869 80.48610 -29.49263 -103.0060 1922.450 23.24125 51.69090 35.34917 1018.173 165.5672 9.971609 80.89580 -29.00652 -103.0393 2812.700 23.58514 52.23867 35.49326 1018.266 142.1301 10.76988 81.27780 -28.00983 -103.0058 1639.500 23.71554 52.81312 35.82719 1018.842 92.75992 11.30594 81.32640 -28.01635 -103.0176 2680.600 23.72804 52.82345 35.82497 1018.259 94.49751 10.47517 81.54860 -27.50072 -103.0113 2445.800 23.77236 52.92203 35.86439 1017.552 88.69930 9.978629 81.57640 -27.50143 -103.0194 1976.500 23.75446 52.91003 35.86970 1017.696 78.54718 11.34350 82.28470 -25.99749 -103.0036 1040.600 24.41008 53.84293 36.04827 1017.626 48.17228 8.616102 82.31940 -25.99020 -103.0051 1092.474 24.34872 53.78128 36.05119 1017.285 42.83696 8.221869 82.68750 -26.61753 -104.8106 427.3500 24.25062 53.68249 36.05569 1018.623 49.13737 7.375663