Horikawa, Keiji; Kodaira, Tomohiro; Jing, Zhang; Obata, Hajime (2023): Seawater oxygen isotope data in the western Pacific Ocean analysed on samples from the R/V Hakuho-Maru KH-14-6 (GEOTRACES, GP19) cruise in 2014-2015 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956808
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Abstract:
This study presents a new set of paired d18Osw and salinity data (n = 83) from a large region of the western Pacific (mainly the western south Pacific) collected during the 2014–2015 El Niño period. We determined regional salinity–d18Osw relationships for three ocean regions (40º–20ºN, 20ºN–30ºS, and 30º–66ºS) and found that all three regions exhibited highly linear relationships between d18Osw and salinity. The 40º–20ºN and 20ºN–30ºS regions had relatively low slopes (0.33 and 0.37 ‰ psu-1, respectively), while the 30º–66ºS region had a relatively high slope (0.54 ‰ psu-1). Each regional regression was statistically different from those of the GEOSECS (1973–1974 La Niña) data, indicating that inter-annual ENSO variability has an impact on salinity–d18Osw relationships over a wide area of the western Pacific.
Keyword(s):
Related to:
Horikawa, Keiji; Kodaira, Tomohiro; Zhang, Jing; Obata, Hajime (2023): Salinity–oxygen isotope relationship during an El Niño (2014–2015) in the southwestern Pacific and comparisons with GEOSECS data (La Niña, 1973–1974). Marine Chemistry, 249, 104222, https://doi.org/10.1016/j.marchem.2023.104222
Project(s):
Funding:
Japan Society for the Promotion of Science (JSPS), grant/award no. 17H01853: Impact of deglacial melt of the Cordillera Ice Sheet on the Gulf of Alaska coastal environment: geochemical and molecular biological analyses of marine sediments
Japan Society for the Promotion of Science (JSPS), grant/award no. 23253001: GEOTRACES program in the Pacific Ocean: studies on the 3-dimensional distribution and behavior of trace elements and isotopes
Coverage:
Median Latitude: -13.090596 * Median Longitude: 173.044064 * South-bound Latitude: -65.726833 * West-bound Longitude: 139.683833 * North-bound Latitude: 34.925667 * East-bound Longitude: -169.313500
Date/Time Start: 2014-12-04T00:00:00 * Date/Time End: 2015-02-24T00:00:00
Minimum DEPTH, water: 5 m * Maximum DEPTH, water: 5 m
Event(s):
KH14-6_SSW001 * Latitude: 34.925700 * Longitude: 139.683800 * Date/Time: 2014-12-04T00:00:00 * Campaign: KH-14-6 (GP19) * Basis: Hakuho-Maru * Method/Device: Surface water sample (SWS)
KH14-6_SSW002 * Latitude: 34.249000 * Longitude: 141.396000 * Date/Time: 2014-12-04T00:00:00 * Campaign: KH-14-6 (GP19) * Basis: Hakuho-Maru * Method/Device: Surface water sample (SWS)
KH14-6_SSW003 * Latitude: 33.480000 * Longitude: 143.458300 * Date/Time: 2014-12-04T00:00:00 * Campaign: KH-14-6 (GP19) * Basis: Hakuho-Maru * Method/Device: Surface water sample (SWS)
Comment:
Oxygen isotopes were measured at University of Toyama. Temperature and salinity were obtained by a thermosalinograph. The salinity data were corrected by an onboard Autosal salinometer (Model 8400B, Guildline Instruments Ltd.). See paper for more information.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Horikawa, Keiji | |||
| 2 | DATE/TIME | Date/Time | Horikawa, Keiji | Geocode | ||
| 3 | LATITUDE | Latitude | Horikawa, Keiji | Geocode | ||
| 4 | LONGITUDE | Longitude | Horikawa, Keiji | Geocode | ||
| 5 | DEPTH, water | Depth water | m | Horikawa, Keiji | Geocode | |
| 6 | δ18O, water | δ18O H2O | ‰ SMOW | Horikawa, Keiji | Isotope ratio mass spectrometer (IRMS) | vs VSMOW |
| 7 | δ18O, water, standard error | δ18O H2O std e | ± | Horikawa, Keiji | Isotope ratio mass spectrometer (IRMS) | |
| 8 | Method comment | Method comm | Horikawa, Keiji | d18O analysis technique | ||
| 9 | Temperature, water | Temp | °C | Horikawa, Keiji | Thermosalinograph (TSG) | |
| 10 | Salinity | Sal | Horikawa, Keiji | Thermosalinograph (TSG) | PSU | |
| 11 | Salinity, standard error | Sal std e | ± | Horikawa, Keiji | Thermosalinograph (TSG) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
498 data points