KNR195-5
EASTERN EQUATORIAL PACIFIC CRUISE
PROJECT SUMMARY

FINAL CRUISE REPORT: May 4, 2009

LEADING PARTY: Department of Geological Sciences, Brown University, Providence, RI 02912-1846

CHIEF SCIENTIST: Dr. Timothy Herbert, Brown University (Timothy_Herbert@brown.edu)

CRUISE DATES: March 25 - April 5, 2009

FUNDING AGENCY: National Science Foundation, Grant No. OCE-0850143

SHIP NAME: R/V Knorr operated by WHOI

LONG CORING IN THE EASTERN EQUATORIAL PACIFIC TO ADDRESS KEY QUESTIONS OF TROPICAL AND GLOBAL CLIMATE CHANGE

DESCRIPTION OF SCIENTIFIC PROGRAM: The purpose of our cruise to the Eastern Equatorial Pacific was to collect multi-core, giant gravity cores, and long piston cores that cover a broad region of the equatorial “cold tongue”. This sample set will be used to assess changes in bottom water chemistry, surface biological productivity, and sea surface temperature on both glacial-interglacial and Holocene time scales. A highlight of the cruise was obtaining 10 long cores (up to 42 m) using the Woods Hole long piston corer. Sites cored on the Galapagos platform and west of the Peru trench have moderate to high deposition rate for pelagic sections, and are suitable for studying the characteristics of the cold tongue over numerous ice age cycles. Sites along the Peru margin are expected to contain very high deposition rate sequences that will reveal decadal to millennial climate change in the eastern tropical Pacific. The surface sediments of multicores were slabbed at 5 mm increments so that the depth habitats of benthic foraminifera could later be identified. As part of the project we also collected water samples, CTD and XBT data, and surface water particulate filtrations for the core-top/modern comparison. Three hydrocasts was taken, one on the northern Galapagos platform one along the Peru margin at 3°50’S, and one on the central Galapagos platform. Data and material collected at each station is provided in the station log.

We gratefully acknowledge the cooperation and assistance of the authorities of the Galapagos National Park and the countries of Ecuador and Peru.

DATA COLLECTED:

Cruise Track: A map with the cruise track is attached to this report.

Site selection: In general, sites cored during this cruise were targeted by relatively shallow water depth (for paleoceanography) and moderate to high deposition rates. As many of our studies utilize carbonate microfossils, we cored in locations shallow enough for good carbonate preservation. The Peru margin (Gulf of Guayaquil) coring stations allowed coring in exceptionally high deposition rate settings (50 cm to 1 m/1000 years), which should permit high resolution paleoclimatic reconstructions. Underway 3.5 khz reflection data are contained in 2 DVD-ROMs entitled “Knudsen Data”. Locations of coring operations are listed in Table 1 of this report.

Station Log: The location of all cores, CTDs and discrete water samples collected is available in the Operations Log.

CTD/XBT: A SeaBird Inc. model 911+ CTD profiler was used to measure electrical conductivity, and temperature versus pressure (depth) at 2 locations. We also had a few XBT stations. The CTD and XBT data in M.S. Excel format are on the DVD-ROM “Underway (IMET), CTD, Gravity, Athena90, ADCP”

Seabeam: Seabeam bathymetry data are collected on 2 DVD-ROMs entitled “Seabeam Data”

Water Sampling: Water samples were collected at three stations during a CTD hydrocast. A 24x 15L Niskin rosette was used for water sampling. Prior to departure the Niskin bottles were all leached in 5% HCl, and all rubber parts were replaced with silicon parts to minimize contamination for trace metals. Water samples were collected for total inorganic carbon (TCO2), total alkalinity (TAlk), trace metals, nutrient concentrations (PO4, NO3), δ13C, δ18O, δ15N and in a few sites for neodymium (Nd) isotopes. In addition to the hydrocasts, bottom water samples were collected during multicore deployment using a 5L acid leached Niskin bottle attached to the frame.

Particulate Filtration: Particulate material was collected from the ship intake water while underway and at coring sites. Organic extracts of glass fiber filters will be analyzed by gas chromatography once materials are returned to Brown University.

Core Logging: All gravity and long piston cores were logged for P-wave velocity, magnetic susceptibility and Gamma Ray Porosity using a Geotek Multi Sensor Track (MST), courtesy of Oregon State University. These non-destructive measurements allow us to infer sediment composition ahead of sampling, and provide a preliminary stratigraphy for estimating the age of sediments. The MST data in M.S. Excel format are on the DVD-ROM “KNR 195-5 Core Log Data” in files organized into folders by each station operation.

Table 1: List of Cruise Stations:

Date Hour(GMT) Sta # Type # Water Depth (uncorr) Latitude Longitude Length Geograph. Loc.
3/26/09 20:52 1 GGC 1 1574 00 14.88 S 89 29.97 W 390cm NE Galapagos Platform
3/27/09 0:20 2 GGC 2 1613 00 12.97 S 89 30.25 W 387cm NE Galapagos Platform
3/27/09 3:12 2 CDH 3 1612 00 12.97 S 89 30.25 W 3437cm NE Galapagos Platform
3/27/09 5:50 2 MC 4 1612 00 12.96 S 89 30.25 W - NE Galapagos Platform
3/27/09 7:36 2 CTD 5 1613 00 12.92 S 89 30.30 W - NE Galapagos Platform
3/27/09 19:40 3 GGC 6 1660 00 43.72 S 88 14.70 W 0cm NE Galapagos Platform
3/28/09 0:28 4 GGC 7 1560 00 49.56 S 87 54.49 W 352cm East Galapagos Platform
3/28/09 2:55 4 CDH 8 1562 00 49.56 S 87 54.49 W 3599.5cm East Galapagos Platform
3/28/09 5:46 4 MC 9 1563 00 49.56 S 87 54.49 W - East Galapagos Platform
3/28/09 16:03 5 GGC 10 2290 01 32.14 S 86 47.75 W 412cm East Galapagos Platform
3/28/09 17:55 5 MC 11 2288 01 31.96 S 86 47.11 W - East Galapagos Platform
3/30/09 10:53 6 MC 12 378 03 42.63 S 81 06.92 W - Peru Margin
3/30/09 12:01 7 GGC 13 379 03 45.01 S 81 08.15 W - Peru Margin
3/30/09 13:00 7 GGC 14 375 3 45.01 S 81 08.15 W 218cm Peru Margin
3/30/09 15:39 7 CDH 15 375 03 45.02 S 81 08.15 W 868cm Peru Margin
3/30/09 16:46 7 MC 16 375 03 45.01 S 82 08.15 W - Peru Margin
3/30/09 21:26 8 GGC 17 1020 03 59.20 S 81 18.60 W 226cm Peru Margin
3/30/09 22:30 8 MC 18 1024 3 59.20 S 81 18.60 W - Peru Margin
3/30/09 23:50 8 GGC 19 1025 03 59.19 S 81 18.57 W 282cm Peru Margin
3/31/09 0:36 8 CTD 20 1024 03 59.20 S 81 18.52 W - Peru Margin
3/31/09 3:43 9 GGC 21 689 03 51.02 S 81 15.00 W 320cm Peru Margin
3/31/09 4:28 9 MC 22 689 03 51.02 S 81 15.00 W - Peru Margin
3/31/09 6:59 7 CDH 23 373 03 44.95 S 81 08.05 W 1715.5cm Peru Margin
3/31/09 10:47 10 GGC 24 381 03 34.95 S 81 02.99 W 209cm Peru Margin
3/31/09 11:20 10 MC 25 381 03 34.95 S 81 02.99 W - Peru Margin
3/31/09 15:49 8 CDH 26 1023 03 59.16 S 81 18.52 W Peru Margin
3/31/09 20:12 11 GGC 27 1762 04 09.91 S 81 24.94 W 282cm Peru Margin
4/1/09 1:21 12 CDH 28 393 03 45.02 S 81 09.05 W - Peru Margin
4/1/09 3:02 12 HC 29 394 03 44.99 S 81 09.02 W - Peru Margin
4/1/09 4:55 7 CDH 30 373 03 45.03 S 81 08.07 W 822.5cm Peru Margin
4/1/09 21:20 13 GGC 31 2949 03 13.43 S 82 54.85 W 386cm S. Carnegie Ridge
4/2/09 0:20 13 CDH 32 2949 03 13.43 S 82 54.85 W 3797cm S. Carnegie Ridge
4/2/09 7:14 13 MC 33 2949 03 13.42 S 82 54.85 W - S. Carnegie Ridge
4/2/09 18:50 14 MC 34 3224 03 35.85 S 83 57.79 W - S. Carnegie Ridge
4/2/09 21:18 14 GGC 35 3225 03 35.85 S 83 57.79 W 433 cm S. Carnegie Ridge
4/3/09 0:15 14 CDH 36 3225 03 35.85 S 83 57.79 W 4263cm S. Carnegie Ridge
4/4/09 14:00 15 GGC 37 596 01 15.94 S 89 41.98 W 265.5cm Galapagos Plat., N of Espanola Is.
4/4/09 15:12 15 MC 38 597 01 15.94 S 89 41.96 W - Galapagos Plat., N of Espanola Is.
4/4/09 16:24 15 LGC 39 597 01 15.94 S 89 41.96 W 767cm Galapagos Plat., N of Espanola Is.
4/4/09 19:26 16 GGC 40 578 01 16.30 S 89 41.81 W 355.5cm Galapagos Plat., N of Espanola Is.
4/4/09 21:01 15 CDH 41 595 01 15.94 S 89 41.88 W 2687cm Galapagos Plat., N of Espanola Is.
4/4/09 23:17 15 MC 42 615 01 15.18 S 89 41.13 W - Galapagos Plat., N of Espanola Is.
4/4/09 23:55 17 GGC 43 617 01 15.13 S 89 41.07 W 368cm Galapagos Plat., N of Espanola Is.
4/5/09 0:59 17 CTD 44 617 01 15.05 S 89 41.09 W - Galapagos Plat., N of Espanola Is.

Table 2: List of Cruise Participants:

Surname First Name Email Affiliation Country
Caballero Rocio Rocio_Caballero@brown.edu Brown USA
Calderon Miguel geoloko_82@hotmail.com INOCAR EC
Chazen Caitlin Caitlin_Chazen@brown.edu Brown USA
deGelleke Laura laura.degelleke@dal.ca Dalhousie CA
Dyck Kelsey kdyck@ucsc.edu UCSC USA
Hastings Katherine katiehastings@gmail.com Dalhousie CA
Herbert Timothy Timothy_Herbert@brown.edu Brown USA
Koutavas Athanasios koutavas@mail.csi.cuny.edu CUNY USA
Lea David lea@geol.ucsb.edu UCSB USA
Major Candace cmajor@nsf.gov NSF USA
Medley Sarah sarahemedley@umail.ucsb.edu UCSB USA
Piela Christine leucas104@aol.com Texas A&M USA
Richaud Matthieu mathieu@csufresno.edu CSFresno USA
Rosenthal Yair rosentha@imcs.rutgers.edu Rutgers USA
Salacup Jeffrey Jeffrey_Salacup@brown.edu Brown USA
Velazco Federico buzofico@hotmail.com IMARPE PE

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