Mg/Ca values for planktonic foraminifera N. pachyderma and G. bulloides from ocean sediment core MD02-2496 on the Vancouver margin, Northeastern Pacific Ocean
Cobertura |
LATITUDE: 48.974500 * LONGITUDE: -127.035700 * DATE/TIME START: 2002-06-01T13:48:00 * DATE/TIME END: 2002-06-01T13:48:00 |
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Data(s) |
08/09/2014
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Resumo |
A new, high-resolution planktonic foraminiferal Mg/Ca-based ocean temperature record has been generated for deep sea core MD02-2496, sited offshore of Vancouver Island, Western Canada during the last deglaciation (21-12 ka). The relationship between Cordilleran Ice Sheet (CIS) retreat and changing regional ocean temperatures has been reconstructed through glaciomarine sediments in MD02-2496 that capture tidewater glacier response to surface ocean thermal forcing. At CIS maximum extent, the marine margin of the ice sheet advanced onto the continental shelf. During this interval, ocean temperatures recorded by surface ocean dwelling Globigerina bulloides remained a relatively constant ~7.5°C while subsurface dwelling Neogloboquadrina pachyderma (s.) recorded temperatures of ~5°C. These ocean temperatures were sufficiently warm to induce significant melt along the tidewater ice terminus similar to modern Alaskan tidewater glacial systems. During the deglacial retreat of the CIS, the N. pachyderma temperature record shows two distinct warming steps of ~2 and 2.5°C between 17.2-16 and 15.5-14 ka respectively, coincident with ice rafting events from the CIS, while G. bulloides records an ~3°C warming from 15 to14 ka. We hypothesize that submarine melting resulting from relatively warm ocean temperatures was an important process driving ice removal from CIS tidewater glaciers during the initial stages of deglaciation. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.835607 doi:10.1594/PANGAEA.835607 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Taylor, Meghan A; Hendy, Ingrid L; Pak, Dorothy K (2014): Deglacial ocean warming and marine margin retreat of the Cordilleran Ice Sheet in the North Pacific Ocean. Earth and Planetary Science Letters, 403, 89-98, doi:10.1016/j.epsl.2014.06.026 |
Palavras-Chave | #Age; AGE; British Columbia Margin; Depth; DEPTH, sediment/rock; G. bulloides d18O; G. bulloides Mg/Ca; Giant piston corer; Globigerina bulloides, d18O; Globigerina bulloides, Magnesium/Calcium ratio; GPC; IMAGES VIII - MONA; Isotope ratio mass spectrometry; Marion Dufresne; Mass spectrometry; MD022496; MD02-2496; MD126; N. pachyderma d18O; N. pachyderma Mg/Ca; Neogloboquadrina pachyderma, Magnesium/Calcium ratio; Neogloboquadrina pachyderma dextral and/or sinistral, d18O |
Tipo |
Dataset |