Citation:

PANGAEA.986588

Name: Surface seawater geochemistry results of IODP Expedition 389 (Hawaiian Drowned Reefs)
Published: 2025-10-10
License: https://creativecommons.org/licenses/by/4.0/
Keywords: 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

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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: (Hawaiian Drowned Reefs (HDR)) * Basis: * 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: (Hawaiian Drowned Reefs (HDR)) * Basis: * 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: (Hawaiian Drowned Reefs (HDR)) * Basis: * 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):

#	Name	Short Name	Unit	Method/Device	Comment
1	Event label	Event
2	Device type	Device
3	Proposed International Geo Sample Number	Prop IGSN
4	Salinity	Sal		Digital refractometer, KRÜSS GmbH, DR6200	in psu
5	pH, porewater	pH pw		Electrode - Mettler Toledo, In-Lab 423 microcombination glass electrode + Radiometer TIM840 Autotitrator
6	Alkalinity, total	AT	µmol/l	Radiometer TIM840 Autotitrator
7	Ammonium	[NH4]+	µmol/l	PTFE tape gas separator technique
8	Chloride	Cl-	mg/l	Ion-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
9	Bromide	Br-	mg/l	Ion-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
10	Sulfate	[SO4]2-	mg/l	Ion-exchange-chromatography, Metrohm AG, 861 Advanced Compact ion chromatograph with sequential compression
11	Aluminium	Al	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
12	Boron	B	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
13	Barium	Ba	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
14	Calcium	Ca2+	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
15	Iron	Fe	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
16	Potassium	K+	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
17	Lithium	Li	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
18	Magnesium	Mg2+	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
19	Manganese	Mn	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
20	Sodium	Na+	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
21	Sulfur	S	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
22	Silicon	Si	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
23	Strontium	Sr	mg/l	Inductively coupled plasma-optical emission spectrometry (ICP-OES) - Varian Inc., Vista-PRO Simultaneous ICP-OES
24	Comment	Comment		Inductively 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

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