Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982
Ocean Drilling Programme (ODP) Site 982 represents a key location for understanding the evolution of climate in the North Atlantic over the past 12 Ma. However, concerns exist about the validity and robustness of the underlying stratigraphy and astrochronology, which currently limits the adequacy of...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.884300 2024-09-15T18:12:35+00:00 Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 Drury, Anna Joy Westerhold, Thomas Hodell, David A Röhl, Ursula MEDIAN LATITUDE: 53.383133 * MEDIAN LONGITUDE: -24.112332 * SOUTH-BOUND LATITUDE: 3.833000 * WEST-BOUND LONGITUDE: -123.206000 * NORTH-BOUND LATITUDE: 57.517000 * EAST-BOUND LONGITUDE: -15.850000 * DATE/TIME START: 1995-07-15T00:00:00 * DATE/TIME END: 1995-07-19T21:12:00 2017 application/zip, 13 datasets https://doi.pangaea.de/10.1594/PANGAEA.884300 https://doi.org/10.1594/PANGAEA.884300 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.884300 https://doi.org/10.1594/PANGAEA.884300 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Drury, Anna Joy; Westerhold, Thomas; Hodell, David A; Röhl, Ursula (2018): Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982. Climate of the Past, 14(3), 321-338, https://doi.org/10.5194/cp-14-321-2018 Ocean Drilling Program ODP dataset publication series 2017 ftpangaea https://doi.org/10.1594/PANGAEA.88430010.5194/cp-14-321-2018 2024-07-24T02:31:21Z Ocean Drilling Programme (ODP) Site 982 represents a key location for understanding the evolution of climate in the North Atlantic over the past 12 Ma. However, concerns exist about the validity and robustness of the underlying stratigraphy and astrochronology, which currently limits the adequacy of this site for high-resolution climate studies. To resolve this uncertainty, we verify and extend the early Pliocene to late Miocene shipboard composite splice at Site 982 using high-resolution XRF core scanning data and establish a robust high-resolution stable isotope stratigraphy and astrochronology between 4.5 and 8.0 Ma. Splice revisions and verifications resulted in ~11 m of gaps in the original Site 982 isotope stratigraphy. Our new stratigraphy reveals previously unseen benthic d18O excursions, particularly prior to 6.65 Ma. The benthic d18O record displays distinct, asymmetric cycles between 7.7 and 6.65 Ma, confirming that high-latitude climate is a prevalent forcing during this interval. An intensification of the 41-kyr beat in both the benthic d13C and d18O is also observed ~6.4 Ma, marking a strengthening in the cryosphere-carbon cycle coupling. A large ~0.7 per mil double excursion is revealed ~6.4-6.3 Ma, which also marks the onset an interval of average higher d18O and large precession and obliquity-dominated d18O excursions between 6.4-5.4 Ma, coincident with the culmination of the late Miocene cooling. The two largest benthic d18O excursions ~6.4-6.3 Ma and TG20/22 coincide with the coolest alkenone-derived SST estimates from Site 982, suggesting a strong connection between the late Miocene global cooling and deep-sea cooling and dynamic ice sheet expansion. The splice revisions and revised astrochronology resolve key stratigraphic issues that have hampered correlation between Site 982, the equatorial Atlantic and the Mediterranean. Comparisons of the revised Site 982 stratigraphy to high-resolution astronomically tuned benthic d18O stratigraphies from ODP Site 926 (equatorial Atlantic) and Ain el ... Other/Unknown Material Ice Sheet North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-123.206000,-15.850000,57.517000,3.833000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Drury, Anna Joy Westerhold, Thomas Hodell, David A Röhl, Ursula Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
topic_facet |
Ocean Drilling Program ODP |
description |
Ocean Drilling Programme (ODP) Site 982 represents a key location for understanding the evolution of climate in the North Atlantic over the past 12 Ma. However, concerns exist about the validity and robustness of the underlying stratigraphy and astrochronology, which currently limits the adequacy of this site for high-resolution climate studies. To resolve this uncertainty, we verify and extend the early Pliocene to late Miocene shipboard composite splice at Site 982 using high-resolution XRF core scanning data and establish a robust high-resolution stable isotope stratigraphy and astrochronology between 4.5 and 8.0 Ma. Splice revisions and verifications resulted in ~11 m of gaps in the original Site 982 isotope stratigraphy. Our new stratigraphy reveals previously unseen benthic d18O excursions, particularly prior to 6.65 Ma. The benthic d18O record displays distinct, asymmetric cycles between 7.7 and 6.65 Ma, confirming that high-latitude climate is a prevalent forcing during this interval. An intensification of the 41-kyr beat in both the benthic d13C and d18O is also observed ~6.4 Ma, marking a strengthening in the cryosphere-carbon cycle coupling. A large ~0.7 per mil double excursion is revealed ~6.4-6.3 Ma, which also marks the onset an interval of average higher d18O and large precession and obliquity-dominated d18O excursions between 6.4-5.4 Ma, coincident with the culmination of the late Miocene cooling. The two largest benthic d18O excursions ~6.4-6.3 Ma and TG20/22 coincide with the coolest alkenone-derived SST estimates from Site 982, suggesting a strong connection between the late Miocene global cooling and deep-sea cooling and dynamic ice sheet expansion. The splice revisions and revised astrochronology resolve key stratigraphic issues that have hampered correlation between Site 982, the equatorial Atlantic and the Mediterranean. Comparisons of the revised Site 982 stratigraphy to high-resolution astronomically tuned benthic d18O stratigraphies from ODP Site 926 (equatorial Atlantic) and Ain el ... |
format |
Other/Unknown Material |
author |
Drury, Anna Joy Westerhold, Thomas Hodell, David A Röhl, Ursula |
author_facet |
Drury, Anna Joy Westerhold, Thomas Hodell, David A Röhl, Ursula |
author_sort |
Drury, Anna Joy |
title |
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
title_short |
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
title_full |
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
title_fullStr |
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
title_full_unstemmed |
Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982 |
title_sort |
reinforcing the north atlantic backbone: revision and extension of the composite splice at odp site 982 |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.884300 https://doi.org/10.1594/PANGAEA.884300 |
op_coverage |
MEDIAN LATITUDE: 53.383133 * MEDIAN LONGITUDE: -24.112332 * SOUTH-BOUND LATITUDE: 3.833000 * WEST-BOUND LONGITUDE: -123.206000 * NORTH-BOUND LATITUDE: 57.517000 * EAST-BOUND LONGITUDE: -15.850000 * DATE/TIME START: 1995-07-15T00:00:00 * DATE/TIME END: 1995-07-19T21:12:00 |
long_lat |
ENVELOPE(-123.206000,-15.850000,57.517000,3.833000) |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_source |
Supplement to: Drury, Anna Joy; Westerhold, Thomas; Hodell, David A; Röhl, Ursula (2018): Reinforcing the North Atlantic backbone: revision and extension of the composite splice at ODP Site 982. Climate of the Past, 14(3), 321-338, https://doi.org/10.5194/cp-14-321-2018 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.884300 https://doi.org/10.1594/PANGAEA.884300 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.88430010.5194/cp-14-321-2018 |
_version_ |
1810450181875826688 |