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Webster, Jody M; Ravelo, Ana Christina; Grant, Hannah; Stewart, Margaret S; Rydzy, Marisa; Le Ber, Erwan; Allison, Nicola; Asami, Ryuji; Boston, Brian; Braga, Juan-Carlos; Brenner, Logan; Chen, Xuefei; Chutcharavan, Peter; Dutton, Andrea; Felis, Thomas; Fukuyo, Naoto; Gischler, Eberhard; Greve, Sahra; Hagen, Amy; Hamon, Youri; Hathorne, Ed C; Humblet, Marc; Jorry, Stephan J; Khanna, Pankaj; McGregor, Helen V; Mortlock, Richard A; Nohl, Theresa; Potts, Donald C; Prohaska, Ana; Prouty, Nancy G; Renema, Willem; Rubin, Kenna Harmony; Westphal, Hildegard; Yokoyama, Yusuke (2025): Surface seawater geochemistry results of IODP Expedition 389 (Hawaiian Drowned Reefs) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.986588

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Published: 2025-10-10 • DOI registered: 2025-11-08

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Abstract:
Results of surface seawater (SSW) geochemistry analyses from International Ocean Discovery Program (IODP) Expedition 389 (Hawaiian Drowned Reefs). The offshore phase of this expedition took place between 2023-08-31 and 2023-10-31 onboard multipurpose vessel MMA Valour sailing from and to Barbers Point Harbor, Hawai'i, USA, followed by the onshore phase from 2025-02-06 to 2025-02-26 at the Bremen Core Repository (BCR) hosted at MARUM – Center for Marine Environmental Sciences, University of Bremen. Sample collection was performed by hand-lowering a self-constructed water sampling device overboard, filling it with ambient seawater, and recovering it to the ship. The water sampling devices differed during leg 1 and leg 2 of the expedition. A total of 16 SSW samples were collected, with one SSW sample from each site except Site M0099, where two samples were recovered as this site has been revisited during leg 2. Each SSW sample was measured for alkalinity, pH, salinity, and ammonium on board the ship. Remaining analyses were performed later on in the onshore laboratories.
For further methodological information see methods chapter in Webster, J.M. et al., 2025 https://doi.org/10.14379/iodp.proc.389.2025
ISD = improvised sampling device; NB = Niskin bottle; #0 = measurement result below detection limit
Keyword(s):
central Pacific; Coral Reef; Earth climate feedbacks; Earth history tipping points; Expedition 389; Hawaiian Drowned Reefs; Hawaiian geology; International Ocean Discovery Program (IODP); MMA Valour; Paleoclimate; sea level; volcanic
Related to:
Webster, Jody M; Ravelo, Ana Christina; Grant, Hannah; Stewart, Margaret S; Rydzy, Marisa; Le Ber, Erwan; Allison, Nicola; Asami, Ryuji; Boston, Brian; Braga, Juan-Carlos; Brenner, Logan; Chen, Xuefei; Chutcharavan, Peter; Dutton, Andrea; Felis, Thomas; Fukuyo, Naoto; Gischler, Eberhard; Greve, Sahra; Hagen, Amy; Hamon, Youri; Hathorne, Ed C; Humblet, Marc; Jorry, Stephan J; Khanna, Pankaj; McGregor, Helen V; Mortlock, Richard A; Nohl, Theresa; Potts, Donald C; Prohaska, Ana; Prouty, Nancy G; Renema, Willem; Rubin, Kenna Harmony; Westphal, Hildegard; Yokoyama, Yusuke (2025): Hawaiian Drowned Reefs. Proceedings of the International Ocean Discovery Program, International Ocean Discovery Program, 389, https://doi.org/10.14379/iodp.proc.389.2025
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 19.920245 * Median Longitude: -155.806266 * South-bound Latitude: 18.856679 * West-bound Longitude: -156.266938 * North-bound Latitude: 20.289982 * East-bound Longitude: -154.939609
Date/Time Start: 2023-09-05T00:00:00 * Date/Time End: 2023-10-31T00:00:00
Minimum Elevation: -1241.8 m * Maximum Elevation: -131.9 m
Event(s):
389-M0096A (KAW-06Ab)  * Latitude: 20.036388 * Longitude: -156.065720 * Date/Time Start: 2023-09-05T00:00:00 * Date/Time End: 2023-09-05T00:00:00 * Elevation: -740.8 m * Location: Hawaii, USA * Campaign: Exp389 (Hawaiian Drowned Reefs (HDR)) * Basis: MMA Valour * Method/Device: Benthic Portable Remotely Operated Drill (PROD5) * Comment: IGSN: IBCR0389EH55101. Spatial reference system (SRS): 4326. Comment: LAT water depth: 740.2m. Borehole abandoned due to technical issues.
389-M0097D (KAW-04Bd)  * Latitude: 19.942699 * Longitude: -156.063477 * Date/Time Start: 2023-10-30T00:00:00 * Date/Time End: 2023-10-31T00:00:00 * Elevation: -424.0 m * Location: Hawaii, USA * Campaign: Exp389 (Hawaiian Drowned Reefs (HDR)) * Basis: MMA Valour * Method/Device: Benthic Portable Remotely Operated Drill (PROD5) * Comment: IGSN: IBCR0389EHC6101. Spatial reference system (SRS): 4326. Comment: LAT water depth: 423.4m. Borehole terminated due to end of offshore expedition.
389-M0098A (MAH-01Aa)  * Latitude: 20.055425 * Longitude: -156.189735 * Date/Time Start: 2023-09-13T00:00:00 * Date/Time End: 2023-09-15T00:00:00 * Elevation: -1100.1 m * Location: Hawaii, USA * Campaign: Exp389 (Hawaiian Drowned Reefs (HDR)) * Basis: MMA Valour * Method/Device: Benthic Portable Remotely Operated Drill (PROD5) * Comment: IGSN: IBCR0389EHJ5101. Spatial reference system (SRS): 4326. Comment: LAT water depth: 1099.5m. Washed 19.10-20.07m. Vessel amber alert, drill was recovered.
Comment:
Data was submitted and proofread by Vera Barbara Bender, MARUM - Center for Marine Environmental Sciences (University Bremen) on behalf of ECORD Science Operator Data Management (https://www.ecord.org).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Device typeDevice
3 Proposed International Geo Sample NumberProp IGSN
4 SalinitySalDigital refractometer, KRÜSS GmbH, DR6200in psu
5 pH, porewaterpH pwElectrode - Mettler Toledo, In-Lab 423 microcombination glass electrode + Radiometer TIM840 Autotitrator
6 Alkalinity, totalATµmol/lRadiometer TIM840 Autotitrator
7 Ammonium[NH4]+µmol/lPTFE tape gas separator technique
8 ChlorideCl-mg/lIon-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
9 BromideBr-mg/lIon-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
10 Sulfate[SO4]2-mg/lIon-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
11 AluminiumAlmg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
12 BoronBmg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
13 BariumBamg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
14 CalciumCa2+mg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
15 IronFemg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
16 PotassiumK+mg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
17 LithiumLimg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
18 MagnesiumMg2+mg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
19 ManganeseMnmg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
20 SodiumNa+mg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
21 SulfurSmg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
22 SiliconSimg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
23 StrontiumSrmg/lInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
24 CommentCommentInductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
359 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Device		3 
Prop IGSN		4 
Sal		5 
pH pw		6 
AT [µmol/l]		7 
[NH4]+ [µmol/l]		8 
Cl- [mg/l]		9 
Br- [mg/l]		10 
[SO4]2- [mg/l]		11 
Al [mg/l]		12 
B [mg/l]		13 
Ba [mg/l]		14 
Ca2+ [mg/l]		15 
Fe [mg/l]		16 
K+ [mg/l]		17 
Li [mg/l]		18 
Mg2+ [mg/l]		19 
Mn [mg/l]		20 
Na+ [mg/l]		21 
S [mg/l]		22 
Si [mg/l]		23 
Sr [mg/l]		24 
Comment
389-M0096A ISDIBCR0389EWO3001347.973.97#01970368.42786#04.6#0407#03930.1531276#010490888#07.4
389-M0097D NBIBCR0389EWA4001338.062.59#01965371.02777#04.5#0408#03930.1611276#010470885#07.3
389-M0098A ISDIBCR0389EWQ3001367.882.67#01981767.82783#04.6#0410#03980.1581282#010670889#07.4
389-M0099A ISDIBCR0389EWS3001358.004.08#01965668.02783#04.5#0406#03910.1621268#010370879#07.3
389-M0099G NBIBCR0389EW44001347.992.64#01972068.32781#04.6#0410#03980.1611282#010610891#07.4
389-M0100A ISDIBCR0389EWW3001347.972.56#01969868.72776#04.5#0401#03840.1561256#010260869#07.2
389-M0101A NBIBCR0389EWX3001348.002.51#01987768.22807#04.5#0409#03920.1551277#010530886#07.3
389-M0102A NBIBCR0389EWY3001348.612.61#01982669.32796#04.7#0416#04120.1621306#010890914#07.6
389-M0103A NBIBCR0389EWZ3001347.922.56#01973069.42782#04.6#0410#03970.1601285#010540895#07.4
389-M0103ANBIBCR0389EWZ3001347.942.57#0duplicate
389-M0104A NBIBCR0389EW04001347.942.56#01979568.52793#04.6#0411#04020.1571286#010650898#07.4
389-M0105A NBIBCR0389EW14001338.002.60#01974168.02786#04.6#0409#03960.1611282#010520892#07.4
389-M0106A NBIBCR0389EW24001348.002.65#01974267.42782#04.6#0411#03990.1591283#010670893#07.4
389-M0107A NBIBCR0389EW54001337.902.57#01970167.72777#04.5#0408#03950.1581277#010490890#07.3
389-M0108B NBIBCR0389EW64001337.972.65#01968367.72775#04.5#0407#03920.1551270#010470877#07.3
389-M0109A NBIBCR0389EW74001337.982.57#01967967.62780#04.6#0409#03970.1581280#010530890#07.4
389-M0110A NBIBCR0389EW84001338.062.55#01966767.52795#04.5#0408#03920.1551275#010460884#07.3