RRS Charles Darwin CD16
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Charles Darwin (74AB) |
| Cruise identifier | CD16 |
| Cruise period | 1986-09-08 — 1986-10-11 |
| Status | Completed |
| Port of departure | Victoria, Seychelles |
| Port of return | Muscat, Oman |
| Purpose | Research |
| Objectives | 1. To determine the vertical distribution and hydrochemistry of nitrogen compounds along off-shore sections of 11 stations from the Gulf of Oman in SE Arabia to the Central oligotrpohic gyre (05N, 67E) and equatorial waters.
2. To quantify the rates of nitrogen assimilation by size-fractionated phytoplankton in relation to their ecophysiology (Nitrogen prefernce, kinetics, light dependence). 3. To estimate bacterial and microzooplanktonic recycling of nitrogen using N-15 isotope dilution techniques, grazing dilution and precision respirometry, in euphotic and oxygen-depleted zones (ODZ) of the NWIO. 4. The net transformation rates of nitrogen in euphotic waters will be followed over the short term (two days) using N-15 'pulse chase' experiments and trace nutrients analyses. 5. Nutrients, salinity, temperature, oxygen, in vivo fluorescence, and near surface vertical variability of chlorophyll, S, T will be continuously monitored between stations and in the upwelling waters off SE Arabia. 6. Free drifting triple sedimentation trap array will be deployed over periods of 1-25 days to quantitate sedimentation, loses from the euphotic chemocline and suboxic aphotic regions of the water column. 7. To investigate bacterial abundance and productivity within the productive, oxgen depleted and upwelling waters of the NWIO. 8. To determine the vertical and latitudinal distribution of trace metals and rare earth elements in the NWIO. |
| Chief scientist | R Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth) |
| Cruise programme |  (0.21 MB) |
| Cruise report | (6.12 MB) |
| Ocean/sea areas | |
| General | Indian Ocean |
| Specific | Indian Ocean |
| Track charts | (0.05 MB) |
| Measurements | |
| Physical oceanography | |
| CTD stations | Quantity: number of deployments = 1 Description: The deployment and recovery datesand times, position, station numbers and associated oceanographic data for CTD, sediment traps, incubation rig and UOR deployments. |
| Biology and fisheries | |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 5 Depth: 100m Exposure: 36.1h Drift: 7.4nm Speed: 0.2kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 7 Depth: 50m Exposure: 21.4h Drift: 13.9nm Speed: 0.66kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 500m Exposure: 21.5h Drift: 10.1nm Speed: 0.47kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 9 Depth: 50m Exposure: 33.6h Drift: 5.7nm Speed: 0.17kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 500m Exposure: 24.9h Drift: 5.4nm Speed: 0.22kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 1 Depth: 100m Exposure: 48h Drift: 27.8nm Speed: 0.58kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 3 Depth: 125m Exposure: 22.7h Drift: 6.6nm Speed: 0.3kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 14 Depth: 74m Exposure: 25.6h Drift: 16.9nm Speed: 0.66kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 75m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 500m Exposure: 25.6h Drift: 10.6nm Speed: 0.41kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 16 Depth: 50m Exposure: 26.8h Drift: 13.9nm Speed: 0.52kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: 16a Depth: 50m Exposure: 35.3h Drift: 16.0nm Speed: 0.45kn |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: B Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: C Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: D Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: E Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: F Depth: 50m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: The deployment and recovery datesand times, position, station numbers and associated oceanographic data for CTD, sediment traps, incubation rig and UOR deployments. |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 100m Exposure: not stated Drift: not stated Speed: not stated |
| Sediment traps | Quantity: number of deployments = 1 Description: Sediment trap deployment. Station no.: not stated Depth: 500m Exposure: 31.4h Drift: 0.9nm Speed: 0.02kn |
| Moorings, landers, buoys | |
| Physical oceanography | |
| CTD stations | 0° 10' 41" N 65° 14' 17" E — Cast: 108 Time: 1232 Depth: 70 Purpose: experiment |
| CTD stations | 19° 26' 42" N 58° 18' 41" E — Cast: 1604 Time: 0904 Depth: 0-450 Purpose: experiments |
| CTD stations | 17° 26' 29" N 61° 30' 35" E — Cast: 1402 Time: 0001 Depth: 0-50 Purpose: production |
| CTD stations | 7° 59' 53" N 66° 59' 42" E — Cast: 301 Time: 0023 Depth: 0-200 Purpose: production |
| CTD stations | 14° 22' 17" N 66° 51' 23" E — Cast: 505 Time: 0308 Depth: 0-200 Purpose: experiment |
| CTD stations | 21° 16' 5" N 63° 18' 41" E — Cast: 703 Time: 0016 Depth: 0-35 Purpose: production |
| CTD stations | 23° 40' 5" N 59° 4' 47" E — Cast: 901 Time: 0304 Depth: 0-500 Purpose: experiments |
| CTD stations | 23° 35' 23" N 59° 0' 0" E — Cast: 906 Time: 0936 Depth: 0-140 Purpose: chemical cast |
| CTD stations | 24° 49' 17" N 57° 12' 47" E — Cast: 1101 Time: 0808 Depth: 60-1200 Purpose: chemical cast |
| CTD stations | 0° 0' 9" N 65° 0' 17" E — Cast: 101 Time: 0028 Depth: 0-70 Purpose: Production |
| CTD stations | 0° 2' 17" N 65° 0' 0" E — Cast:102 Time: not stated Depth: not stated Purpose: experiments |
| CTD stations | 0° 2' 23" N 64° 59' 53" E — Cast: 103 Time: 0640 Depth: 700-3900 Purpose: chemical cast |
| CTD stations | 0° 3' 41" N 65° 5' 35" E — Cast:104 Time: 1453 Depth: 0-600 Purpose: chemical cast |
| CTD stations | 0° 4' 12" N 65° 5' 53" E — Cast:105 Time: 1902 Depth: 0-200 Purpose: profiling |
| CTD stations | 0° 7' 30" N 65° 7' 23" E — Cast:106 Time: 0015 Depth: 0-200 Purpose: production |
| CTD stations | 0° 7' 11" N 65° 12' 5" E — Cast: 107 Time: 0618 Depth: 50 Purpose: experiment |
| CTD stations | 0° 12' 23" N 65° 19' 47" E — Cast: 109 Time: 1833 Depth: 200 Purpose: experiment |
| CTD stations | 0° 13' 48" N 65° 22' 35" E — Cast: 110 Time: 0222 Depth: 0-1200 Purpose: chemical cast |
| CTD stations | 3° 59' 35" N 67° 0' 5" E — Cast: 201 Time: 0630 Depth: 0-600 Purpose: chemical cast |
| CTD stations | 3° 59' 17" N 67° 0' 47" E — Cast: 202 Time: 1005 Depth: 0-3100 Purpose: chemical cast |
| CTD stations | 8° 0' 47" N 66° 59' 5" E — Cast: 302 Time: 0323 Depth: 600-4500 Purpose: chemaical cast |
| CTD stations | 7° 59' 35" N 67° 0' 23" E — Cast: 303 Time: 1048 Depth: 0-500 Purpose: chemical cast |
| CTD stations | 7° 57' 11" N 67° 0' 36" E — Cast: 304 Time: 0031 Depth: 0-100 Purpose: production |
| CTD stations | 7° 55' 47" N 67° 1' 23" W — Cast: 305 Time: 1030 Depth: 0-1000 Purpose: experiment |
| CTD stations | 11° 59' 47" N 66° 58' 48" E — Cast: 401 Time: 2038 Depth: 600-4200 Purpose: chemical cast |
| CTD stations | 11° 59' 35" N 66° 58' 53" E — Cast: 402 Time: 0327 Depth: 0-500 Purpose: chemical cast |
| CTD stations | 14° 25' 35" N 66° 55' 23" E — Cast: 501 Time: not stated Depth: 0-75 Purpose: production |
| CTD stations | 14° 25' 35" N 66° 55' 17" E — Cast: 502 Time: 0313 Depth: 0-3900 Purpose: chemical cast |
| CTD stations | 14° 22' 23" N 66° 54' 11" E — Cast: 503 Time: 1029 Depth: 0-500 Purpose: chemical cast |
| CTD stations | 14° 22' 30" N 66° 54' 0" E — Cast: 504 Time: not stated Depth: 0-75 Purpose: production |
| CTD stations | 14° 21' 35" N 66° 50' 35" E — Cast: 506 Time: 0500 Depth: 100-300 Purpose: chemical cast |
| CTD stations | 14° 20' 17" N 66° 54' 29" E — Cast: 507 Time: 0921 Depth: 60-400 Purpose: chemical cast |
| CTD stations | 14° 18' 17" N 66° 56' 6" E — Cast: 508 Time: 1145 Depth: 0-400 Purpose: chemical cast |
| CTD stations | 18° 59' 53" N 67° 0' 29" E — Cast: 601 Time: 0236 Depth: 0-3200 Purpose: chemical cast |
| CTD stations | 18° 58' 35" N 66° 59' 29" E — Cast: 602 Time: 0940 Depth: 0-200 Purpose: chemical cast |
| CTD stations | 21° 15' 5" N 63° 15' 5" E — Cast: 701 Time: 1350 Depth: 0-100 Purpose: experiment |
| CTD stations | 21° 14' 47" N 63° 15' 41" E — Cast: 702 Time: 1535 Depth: 0-400 Purpose: experiment |
| CTD stations | 21° 15' 29" N 63° 21' 54" E — Cast: 704 Time: 0240 Depth: 175-3300 Purpose: chemical cast |
| CTD stations | 21° 14' 5" N 63° 27' 5" E — Cast: 705 Time: 1023 Depth: 0-175 Purpose: chemical cast |
| CTD stations | 22° 39' 36" N 60° 40' 35" E — Cast: 801 Time: 1134 Depth: 175-3000 Purpose: chemical cast |
| CTD stations | 22° 39' 18" N 60° 42' 23" E — Cast: 802 Time: 1734 Depth: 0-200 Purpose: chemical cast |
| CTD stations | 23° 39' 5" N 59° 5' 41" E — Cast: 903 Time: not stated Depth: 0-500 Purpose: chemical cast |
| CTD stations | 23° 40' 30" N 59° 3' 23" E — Cast: 904 Time: 0015 Depth: 0-50 Purpose: production |
| CTD stations | 23° 38' 6" N 59° 1' 23" E — Cast: 905 Time: 0232 Depth: 175-2750 Purpose: chemical cast |
| CTD stations | 23° 36' 0" N 58° 59' 53" E — Cast: 907 Time: 1522 Depth: 0-3 Purpose: experiments |
| CTD stations | 24° 20' 29" N 58° 9' 41" E — Cast: 1001 Time: 1121 Depth: 150-2700 Purpose: chemical cast |
| CTD stations | 24° 18' 9" N 58° 9' 59" E — Cast: 1002 Time: 1632 Depth: 0-200 Purpose: chemical cast |
| CTD stations | 24° 19' 53" N 58° 9' 47" E — Cast: 1003 Time: 0203 Depth: 0-50 Purpose: experiments |
| CTD stations | 24° 49' 5" N 57° 13' 17" E — Cast: 1102 Time: 1126 Depth: 75-240 Purpose: experiments |
| CTD stations | 24° 49' 29" N 57° 12' 54" E — Cast:1103 Time: 1232 Depth: 0-55 Purpose: chemical cast |
| CTD stations | 19° 57' 59" N 60° 47' 42" E — Cast: 1301 Time: 1458 Depth: 0-3500 Purpose: chemical cast |
| CTD stations | 19° 58' 5" N 60° 48' 53" E — Cast: 1302 Time: 2000 Depth: 0-300 Purpose: chemical cast |
| CTD stations | 17° 24' 36" N 61° 20' 29" E — Cast: 1401 Time: 1116 Depth: 0-500 Purpose: chemical cast |
| CTD stations | 17° 25' 35" N 61° 29' 5" E — Cast: 1403 Time: 0222 Depth: 0-3500 Purpose: chemical cast |
| CTD stations | 17° 26' 17" N 61° 34' 5" E — Cast: 1404 Time: 1010 Depth: 0-100 Purpose: experiments |
| CTD stations | 17° 26' 11" N 61° 35' 17" E — Cast: 1405 Time: 1130 Depth: 0-400 Purpose: chemical cast |
| CTD stations | 18° 12' 11" N 59° 42' 11" E — Cast: 1501 Time: 0304 Depth: 0-4000 Purpose: chemical cast |
| CTD stations | 18° 13' 11" N 59° 44' 17" E — Cast: 1502 Time: 0914 Depth: 0-300 Purpose: chemical cast |
| CTD stations | 19° 27' 5" N 58° 18' 47" E — Cast: 1601 Time: 0005 Depth: 0-40 Purpose: production |
| CTD stations | 19° 24' 5" N 58° 18' 5" E — Cast: 1602 Time: 0507 Depth: 0-580 Purpose: chemical cast |
| CTD stations | 19° 26' 42" N 58° 18' 41" E — Cast: 1603 Time: 0933 Depth: 0-43 Purpose: experiments |
| CTD stations | 23° 39' 59" N 59° 4' 12" E — Cast: 902 Time: 0837 Depth: 230-500 Purpose: experiments |
