Age model, and raw data of bottom water temperatures (BWT) and stable oxygen isotopes of seawater reconstructions (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica from the Irish Continental Shelf
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2019
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| _version_ | 1867169135364931584 |
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| author | Curran, Michelle Rosenthal, Yair Wright, James D Morley, Audrey |
| author_facet | Curran, Michelle Rosenthal, Yair Wright, James D Morley, Audrey |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | There is increasing evidence that accelerated warming at high-latitudes is associated with increased climate variability at mid-latitudes, including the frequency and intensity of storms. However, due to short instrumental records our understanding of how ocean-atmosphere dynamics operate during warmer than present climates remains limited. Here we present a palaeoceanographic investigation of the transition between the middle Holocene intervals of the Northgrippian (8.2 - 4.2 ka) and the late Holocene interval of the Meghalayan (4.2 - 0 ka) to test the hypothesis of an eastward shift of the Icelandic Low under warmer than present climate scenarios. Reconstructions of bottom water temperatures (BWT) and stable oxygen isotopes (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica reveal warmer than present BWT of up to 2.6 ± 0.7°C on the Irish Continental Shelf until circa 4.2 ka. The results suggest that Atlantic waters of subtropical origins were more prevalent in the eastern subpolar gyre (SPG) and on the Irish Continental Shelf. We link this oceanographic signature to an eastward shift of the Icelandic Low. We then place our local temperature record into an extra-regional context, using a combination of modern observations and existing palaeo datasets, which enables us to assess the impact of changing atmospheric modes on ocean-atmosphere climate linkages within the North Atlantic Region. The enhanced influence of warm subtropical Atlantic waters recirculating along the boundaries of the SPG under this scenario, would potentially have enhanced melt rates of marine-terminating glaciers on the east Greenland Shelf during the Northgrippian. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_907706 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age model, and raw data of bottom water temperatures (BWT) and stable oxygen isotopes of seawater reconstructions (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica from the Irish Continental Shelf Curran, Michelle Rosenthal, Yair Wright, James D Morley, Audrey AGE; Bottom water temperature; Calculated following Fairbanks (1989); Calculated from Mg/Ca ratios and d18O corrected; Calculated from Mg/Ca ratios in Hyalinea balthica; Calculated from δ18Osw; Celtic Voyager; CV15025; CV15025_GC_07_01; DEPTH, sediment/rock; GC; Gravity corer; Hyalinea balthica; Hyalinea balthica, Magnesium/Calcium ratio; Hyalinea balthica, δ18O; Irish Continental Shelf; Measured from H. balthica with ICPMS in solution (Rosenthal et al. 1999); Micromass Optima mass spectrometer fitted with a Multiprep device; Northgrippian; Mid-Holocene; Mg/Ca; Paleosalinity; δ18O, seawater, reconstructed There is increasing evidence that accelerated warming at high-latitudes is associated with increased climate variability at mid-latitudes, including the frequency and intensity of storms. However, due to short instrumental records our understanding of how ocean-atmosphere dynamics operate during warmer than present climates remains limited. Here we present a palaeoceanographic investigation of the transition between the middle Holocene intervals of the Northgrippian (8.2 - 4.2 ka) and the late Holocene interval of the Meghalayan (4.2 - 0 ka) to test the hypothesis of an eastward shift of the Icelandic Low under warmer than present climate scenarios. Reconstructions of bottom water temperatures (BWT) and stable oxygen isotopes (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica reveal warmer than present BWT of up to 2.6 ± 0.7°C on the Irish Continental Shelf until circa 4.2 ka. The results suggest that Atlantic waters of subtropical origins were more prevalent in the eastern subpolar gyre (SPG) and on the Irish Continental Shelf. We link this oceanographic signature to an eastward shift of the Icelandic Low. We then place our local temperature record into an extra-regional context, using a combination of modern observations and existing palaeo datasets, which enables us to assess the impact of changing atmospheric modes on ocean-atmosphere climate linkages within the North Atlantic Region. The enhanced influence of warm subtropical Atlantic waters recirculating along the boundaries of the SPG under this scenario, would potentially have enhanced melt rates of marine-terminating glaciers on the east Greenland Shelf during the Northgrippian. |
| title | Age model, and raw data of bottom water temperatures (BWT) and stable oxygen isotopes of seawater reconstructions (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica from the Irish Continental Shelf |
| topic | AGE; Bottom water temperature; Calculated following Fairbanks (1989); Calculated from Mg/Ca ratios and d18O corrected; Calculated from Mg/Ca ratios in Hyalinea balthica; Calculated from δ18Osw; Celtic Voyager; CV15025; CV15025_GC_07_01; DEPTH, sediment/rock; GC; Gravity corer; Hyalinea balthica; Hyalinea balthica, Magnesium/Calcium ratio; Hyalinea balthica, δ18O; Irish Continental Shelf; Measured from H. balthica with ICPMS in solution (Rosenthal et al. 1999); Micromass Optima mass spectrometer fitted with a Multiprep device; Northgrippian; Mid-Holocene; Mg/Ca; Paleosalinity; δ18O, seawater, reconstructed |
| url | https://doi.org/10.1594/PANGAEA.907706 |