Evdoshenko, M A (1998): Parameters of the near-bottom nepheloid layer off the northwestern Africa coast [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.760325, Supplement to: Evdoshenko, MA (1998): Variability of the near-bottom nepheloid layer off the northwestern Africa coast. Translated from Okeanologiya, 1998, 38(6), 830-839, Oceanology, 38(6), 749-757
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Abstract:
Vertical profiles of light scattering at a right angle and turbidity profiles in seawater indicating suspended matter concentration in the near-bottom nepheloid layer (NNL) were measured simultaneously with temperature, salinity, and density profiles at the continental slope off the northwestern Africa. About 100 stations 5' apart in latitude and longitude were carried out over an ocean area of 6100 sq. km. Special features of the NNL variability in the area were analyzed. It was found that some structural parameters of the NNL (maximum transparency depth, that is the upper boundary of NNL; NNL thickness; maximum and total turbidity) correlate with ocean depth. On the average, thickness of the NNL in the area is 20-40% of the ocean depth. At most stations the NNL is fairly strong. In the shelf region NNL turbidity was influenced by the intensive near-shore upwelling. Formation of ''high-energy near-bottom layers'' in the shelf region resulted from passing of a mesoscale cyclonic eddy that caused redistribution of measured quantities within the entire water column.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 21.835556 * Median Longitude: -18.238671 * South-bound Latitude: 21.416667 * West-bound Longitude: -18.995000 * North-bound Latitude: 22.170000 * East-bound Longitude: -17.231667
Date/Time Start: 1991-12-18T16:52:00 * Date/Time End: 1991-12-23T04:44:00
Minimum Elevation: -1926.0 m * Maximum Elevation: -58.0 m
Event(s):
AMK25-2576 * Latitude: 21.578333 * Longitude: -17.238333 * Date/Time: 1991-12-18T16:52:00 * Elevation: -66.0 m * Location: Tropical East Atlantic * Method/Device: Nephelometer (NMR)
AMK25-2578 * Latitude: 21.750000 * Longitude: -17.235000 * Date/Time: 1991-12-18T19:03:00 * Elevation: -65.0 m * Location: Tropical East Atlantic * Method/Device: Nephelometer (NMR)
AMK25-2579 * Latitude: 21.831667 * Longitude: -17.238333 * Date/Time: 1991-12-18T20:11:00 * Elevation: -62.0 m * Location: Tropical East Atlantic * Method/Device: Nephelometer (NMR)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Evdoshenko, M A | |||
| 2 | Latitude of event | Latitude | Evdoshenko, M A | |||
| 3 | Longitude of event | Longitude | Evdoshenko, M A | |||
| 4 | Elevation of event | Elevation | m | Evdoshenko, M A | ||
| 5 | Date/Time of event | Date/Time | Evdoshenko, M A | |||
| 6 | Depth of maximum transparency | Depth max trans | m | Evdoshenko, M A | Nephelometer (NMR) | |
| 7 | Thickness of nepheloid layer | Thick NL | m | Evdoshenko, M A | Nephelometer (NMR) | |
| 8 | Ratio | Ratio | Evdoshenko, M A | Calculated | max turbidity within NNL / turbidity at depth max trans |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
252 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 Date/Time | 6 Depth max trans [m] | 7 Thick NL [m] | 8 Ratio |
|---|---|---|---|---|---|---|---|
| AMK25-2576 | 21.5783 | -17.2383 | -66 | 1991-12-18T16:52 | 52 | 14 | 3.5 |
| AMK25-2578 | 21.7500 | -17.2350 | -65 | 1991-12-18T19:03 | 45 | 20 | 4.0 |
| AMK25-2579 | 21.8317 | -17.2383 | -62 | 1991-12-18T20:11 | 45 | 17 | 1.7 |
| AMK25-2580 | 21.9150 | -17.2333 | -61 | 1991-12-18T21:02 | 44 | 17 | 2.5 |
| AMK25-2581 | 22.0000 | -17.2333 | -58 | 1991-12-18T21:54 | 52 | 6 | 2.3 |
| AMK25-2582 | 22.0833 | -17.2350 | -67 | 1991-12-18T22:45 | 49 | 18 | 6.3 |
| AMK25-2583 | 22.1650 | -17.2317 | -70 | 1991-12-18T23:04 | 56 | 14 | 2.2 |
| AMK25-2584 | 22.1667 | -17.3200 | -86 | 1991-12-19T00:25 | 59 | 27 | 1.7 |
| AMK25-2585 | 22.1683 | -17.4017 | -481 | 1991-12-19T01:29 | 200 | 281 | 2.1 |
| AMK25-2586 | 22.1650 | -17.4933 | -853 | 1991-12-19T02:44 | 585 | 318 | 2.1 |
| AMK25-2587 | 22.1633 | -17.5750 | -1068 | 1991-12-19T03:49 | 635 | 433 | 2.2 |
| AMK25-2588 | 22.1583 | -17.6683 | -1130 | 1991-12-19T05:23 | 850 | 280 | 3.0 |
| AMK25-2589 | 22.1567 | -17.7483 | -1204 | 1991-12-19T07:08 | 700 | 504 | 3.9 |
| AMK25-2590 | 22.1583 | -17.8283 | -1383 | 1991-12-19T08:36 | 800 | 583 | 5.8 |
| AMK25-2591 | 22.1700 | -17.9017 | -1536 | 1991-12-19T09:48 | 1000 | 536 | 4.9 |
| AMK25-2592 | 22.1683 | -17.9900 | -1802 | 1991-12-19T11:02 | 1130 | 672 | 4.4 |
| AMK25-2594 | 22.0833 | -17.8983 | -1669 | 1991-12-19T16:17 | 1493 | 176 | 7.3 |
| AMK25-2595 | 22.0833 | -17.8200 | -1440 | 1991-12-19T17:57 | 870 | 570 | 3.4 |
| AMK25-2596 | 22.0850 | -17.7383 | -1286 | 1991-12-19T19:24 | 940 | 346 | 3.9 |
| AMK25-2597 | 22.0833 | -17.6433 | -1105 | 1991-12-19T20:51 | 810 | 295 | 3.9 |
| AMK25-2598 | 22.0867 | -17.5650 | -866 | 1991-12-19T22:02 | 540 | 326 | 3.8 |
| AMK25-2599 | 22.0833 | -17.4817 | -645 | 1991-12-19T23:06 | 430 | 215 | 2.7 |
| AMK25-2600 | 22.0833 | -17.3950 | -109 | 1991-12-20T00:18 | 74 | 7 | 1.8 |
| AMK25-2601 | 22.0833 | -17.3183 | -81 | 1991-12-20T01:18 | 57 | 24 | 1.9 |
| AMK25-2603 | 22.0017 | -17.4050 | -88 | 1991-12-20T02:59 | 57 | 31 | 11.4 |
| AMK25-2604 | 22.0017 | -17.4933 | -746 | 1991-12-20T03:53 | 480 | 266 | 2.2 |
| AMK25-2605 | 22.0117 | -17.5717 | -1034 | 1991-12-20T04:56 | 738 | 296 | 2.2 |
| AMK25-2606 | 22.0283 | -17.6583 | -1266 | 1991-12-20T06:08 | 840 | 426 | 2.3 |
| AMK25-2607 | 22.0017 | -17.7383 | -1647 | 1991-12-20T07:28 | 890 | 757 | 4.9 |
| AMK25-2608 | 22.0067 | -17.8200 | -1679 | 1991-12-20T08:47 | 1375 | 304 | 2.3 |
| AMK25-2609 | 22.0050 | -17.9050 | -1891 | 1991-12-20T10:13 | 1375 | 516 | 2.1 |
| AMK25-2610 | 21.9933 | -18.0017 | -1926 | 1991-12-20T11:41 | 1372 | 554 | 2.3 |
| AMK25-2611 | 21.9200 | -18.9900 | -1916 | 1991-12-20T13:38 | 1300 | 616 | 3.0 |
| AMK25-2612 | 21.9150 | -18.9050 | -1760 | 1991-12-20T15:15 | 1345 | 415 | 3.0 |
| AMK25-2613 | 21.9183 | -18.8200 | -1687 | 1991-12-20T16:47 | 1350 | 337 | 2.5 |
| AMK25-2614 | 21.9167 | -18.7333 | -1565 | 1991-12-20T18:11 | 1354 | 211 | 2.5 |
| AMK25-2615 | 21.9183 | -18.6500 | -1330 | 1991-12-20T19:31 | 920 | 410 | 2.6 |
| AMK25-2616 | 21.9183 | -18.5650 | -1125 | 1991-12-20T20:49 | 510 | 615 | 2.2 |
| AMK25-2617 | 21.9167 | -18.4833 | -799 | 1991-12-20T21:55 | 470 | 329 | 2.0 |
| AMK25-2618 | 21.9167 | -18.4033 | -509 | 1991-12-20T23:08 | 160 | 349 | 3.0 |
| AMK25-2619 | 21.9167 | -18.3167 | -69 | 1991-12-21T00:01 | 44 | 25 | 3.8 |
| AMK25-2620 | 21.8300 | -18.3167 | -67 | 1991-12-21T01:01 | 50 | 17 | 1.6 |
| AMK25-2621 | 21.8383 | -18.3967 | -109 | 1991-12-21T01:44 | 92 | 17 | 1.4 |
| AMK25-2622 | 21.8333 | -18.4900 | -837 | 1991-12-21T02:41 | 735 | 102 | 2.6 |
| AMK25-2623 | 21.8300 | -18.5700 | -1109 | 1991-12-21T03:42 | 890 | 219 | 2.1 |
| AMK25-2624 | 21.8300 | -18.6517 | -1247 | 1991-12-21T04:47 | 800 | 447 | 2.9 |
| AMK25-2625 | 21.8350 | -18.7450 | -1384 | 1991-12-21T06:03 | 850 | 534 | 3.0 |
| AMK25-2626 | 21.8367 | -18.8217 | -1431 | 1991-12-21T07:18 | 1080 | 351 | 2.1 |
| AMK25-2627 | 21.8333 | -18.9083 | -1440 | 1991-12-21T08:37 | 1280 | 160 | 3.1 |
| AMK25-2628 | 21.8317 | -18.9950 | -1602 | 1991-12-21T09:51 | 1300 | 302 | 3.2 |
| AMK25-2629 | 21.7517 | -18.9900 | -1394 | 1991-12-21T11:47 | 690 | 704 | 2.2 |
| AMK25-2630 | 21.7483 | -18.9050 | -1201 | 1991-12-21T12:38 | 560 | 641 | 2.3 |
| AMK25-2631 | 21.7517 | -18.8267 | -1126 | 1991-12-21T14:18 | 800 | 326 | 2.3 |
| AMK25-2632 | 21.7533 | -18.7350 | -1097 | 1991-12-21T15:16 | 800 | 297 | 6.5 |
| AMK25-2633 | 21.7517 | -18.6517 | -1009 | 1991-12-21T16:29 | 775 | 234 | 6.4 |
| AMK25-2634 | 21.7517 | -18.5700 | -990 | 1991-12-21T17:39 | 820 | 170 | 4.4 |
| AMK25-2635 | 21.7500 | -18.4867 | -642 | 1991-12-21T18:48 | 450 | 192 | 2.2 |
| AMK25-2636 | 21.7483 | -18.4050 | -112 | 1991-12-21T20:02 | 87 | 25 | 2.0 |
| AMK25-2638 | 21.6650 | -18.3183 | -75 | 1991-12-21T21:48 | 60 | 15 | 1.4 |
| AMK25-2639 | 21.6650 | -18.4100 | -106 | 1991-12-21T22:36 | 84 | 22 | 1.7 |
| AMK25-2640 | 21.6683 | -18.4900 | -390 | 1991-12-21T23:27 | 141 | 249 | 1.3 |
| AMK25-2641 | 21.6750 | -18.5883 | -880 | 1991-12-22T01:02 | 741 | 139 | 2.1 |
| AMK25-2642 | 21.6733 | -18.6567 | -827 | 1991-12-22T02:04 | 677 | 150 | 5.9 |
| AMK25-2643 | 21.6767 | -18.7367 | -895 | 1991-12-22T03:05 | 745 | 150 | 5.6 |
| AMK25-2644 | 21.6717 | -18.8183 | -969 | 1991-12-22T04:07 | 750 | 219 | 3.8 |
| AMK25-2645 | 21.6700 | -18.9067 | -1099 | 1991-12-22T05:22 | 570 | 529 | 2.3 |
| AMK25-2646 | 21.6700 | -18.9867 | -1304 | 1991-12-22T06:28 | 600 | 704 | 3.6 |
| AMK25-2647 | 21.5850 | -18.9850 | -1296 | 1991-12-22T07:48 | 775 | 521 | 3.4 |
| AMK25-2648 | 21.5867 | -18.9000 | -1042 | 1991-12-22T08:57 | 580 | 462 | 3.6 |
| AMK25-2649 | 21.5883 | -18.8167 | -850 | 1991-12-22T10:05 | 645 | 205 | 3.7 |
| AMK25-2650 | 21.5867 | -18.7350 | -725 | 1991-12-22T11:14 | 625 | 100 | 2.8 |
| AMK25-2651 | 21.6000 | -18.6500 | -658 | 1991-12-22T12:29 | 550 | 108 | 2.3 |
| AMK25-2652 | 21.5850 | -18.5683 | -612 | 1991-12-22T13:21 | 480 | 132 | 0.5 |
| AMK25-2653 | 21.5833 | -18.4867 | -302 | 1991-12-22T14:29 | 250 | 52 | 0.2 |
| AMK25-2654 | 21.5817 | -18.3983 | -101 | 1991-12-22T15:03 | 51 | 50 | 0.5 |
| AMK25-2655 | 21.5850 | -18.5983 | -75 | 1991-12-22T16:24 | 44 | 31 | 0.8 |
| AMK25-2659 | 21.4967 | -18.4883 | -282 | 1991-12-22T20:15 | 219 | 63 | 0.9 |
| AMK25-2660 | 21.4983 | -18.5683 | -509 | 1991-12-22T21:07 | 212 | 297 | 0.8 |
| AMK25-2662 | 21.5033 | -18.7367 | -678 | 1991-12-22T23:01 | 237 | 441 | 2.3 |
| AMK25-2663 | 21.4183 | -18.7317 | -664 | 1991-12-23T00:19 | 500 | 164 | 2.5 |
| AMK25-2664 | 21.4183 | -18.6550 | -539 | 1991-12-23T01:26 | 440 | 99 | 2.5 |
| AMK25-2665 | 21.4167 | -18.5750 | -442 | 1991-12-23T02:46 | 145 | 297 | 2.2 |
| AMK25-2666 | 21.4200 | -18.4850 | -247 | 1991-12-23T03:57 | 223 | 24 | 1.4 |
| AMK25-2667 | 21.4167 | -18.4017 | -93 | 1991-12-23T04:44 | 34 | 59 | 2.7 |