Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences
Abstract We investigated an alkenone-based sea surface temperature (SST) and the hydrographic change records of the subarctic Northwestern (NW) Pacific from the last glacial to interglacial. The core we investigated is a piston core (LV 63-41-2, 52.56° N, 160.00° E; water depth 1924 m) retrieved fro...
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ftdoajarticles:oai:doaj.org/article:e0469d1c2dda44daadccbcf87568eda4 2023-05-15T15:44:00+02:00 Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences Pai-Sen Yu Chia-Ju Liao Min-Te Chen Jian-Jun Zou Xuefa Shi A. A. Bosin Sergey A. Gorbarenko Yusuke Yokoyama 2020-06-01T00:00:00Z https://doi.org/10.1186/s40645-020-00339-x https://doaj.org/article/e0469d1c2dda44daadccbcf87568eda4 EN eng SpringerOpen http://link.springer.com/article/10.1186/s40645-020-00339-x https://doaj.org/toc/2197-4284 doi:10.1186/s40645-020-00339-x 2197-4284 https://doaj.org/article/e0469d1c2dda44daadccbcf87568eda4 Progress in Earth and Planetary Science, Vol 7, Iss 1, Pp 1-13 (2020) Last glacial Stratification Alkenone Sea surface temperature Northwestern Pacific Subarctic Geography. Anthropology. Recreation G Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1186/s40645-020-00339-x 2022-12-31T13:22:20Z Abstract We investigated an alkenone-based sea surface temperature (SST) and the hydrographic change records of the subarctic Northwestern (NW) Pacific from the last glacial to interglacial. The core we investigated is a piston core (LV 63-41-2, 52.56° N, 160.00° E; water depth 1924 m) retrieved from the southern offshore east coast of the Kamchatka Peninsula, which is a location of high sedimentation rate, with highly dynamic interactions with the cold/warm water masses of the Bering Sea/the NW Pacific. Based on our alkenone analysis with a previously well-established chronology of the core, we found high glacial C37:4 contents suggesting larger freshwater influences prior to the last deglacial in approximately 27–16 ka BP. The most significant features of what we found are alkenone indicative of “warming” intervals with minimum alkenone productions that occurred prior to the stadial Heinrich event 1 and the Younger Dryas. In contrast, for the interval corresponding to the Bølling–Allerød period, our alkenone analysis shows relatively “colder” but maximum alkenone productions. We conclude that this particular subarctic alkenone SST proxy record is mainly masked by non-thermal environmental influences, such as strong shifts of timing and duration of the sea ice retreat and/or salinity changes in surface water at this site, which could cause changes in water stratification that affect nutrient supplies of the upper ocean that modulate growth durations of phytoplankton/coccolithophore productions. Our studies suggest that this subarctic alkenone “SST” proxy record is indicative of the changes of seasonality that control the timing and duration of the blooming seasons of coccolithophores. The alkenone “SST” proxy is also dominantly driven by water stratification effects that, instead of SSTs, reflect most likely a combination of the following local to regional climate and ocean current patterns: (1) the amount of meltwater inputs from high mountain glaciers at Kamchatka; (2) less saline, nutrient-rich Alaskan ... Article in Journal/Newspaper Bering Sea Kamchatka Kamchatka Peninsula Sea ice Subarctic Directory of Open Access Journals: DOAJ Articles Bering Sea Kamchatka Peninsula ENVELOPE(160.000,160.000,56.000,56.000) Pacific Progress in Earth and Planetary Science 7 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Last glacial Stratification Alkenone Sea surface temperature Northwestern Pacific Subarctic Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
Last glacial Stratification Alkenone Sea surface temperature Northwestern Pacific Subarctic Geography. Anthropology. Recreation G Geology QE1-996.5 Pai-Sen Yu Chia-Ju Liao Min-Te Chen Jian-Jun Zou Xuefa Shi A. A. Bosin Sergey A. Gorbarenko Yusuke Yokoyama Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
topic_facet |
Last glacial Stratification Alkenone Sea surface temperature Northwestern Pacific Subarctic Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
Abstract We investigated an alkenone-based sea surface temperature (SST) and the hydrographic change records of the subarctic Northwestern (NW) Pacific from the last glacial to interglacial. The core we investigated is a piston core (LV 63-41-2, 52.56° N, 160.00° E; water depth 1924 m) retrieved from the southern offshore east coast of the Kamchatka Peninsula, which is a location of high sedimentation rate, with highly dynamic interactions with the cold/warm water masses of the Bering Sea/the NW Pacific. Based on our alkenone analysis with a previously well-established chronology of the core, we found high glacial C37:4 contents suggesting larger freshwater influences prior to the last deglacial in approximately 27–16 ka BP. The most significant features of what we found are alkenone indicative of “warming” intervals with minimum alkenone productions that occurred prior to the stadial Heinrich event 1 and the Younger Dryas. In contrast, for the interval corresponding to the Bølling–Allerød period, our alkenone analysis shows relatively “colder” but maximum alkenone productions. We conclude that this particular subarctic alkenone SST proxy record is mainly masked by non-thermal environmental influences, such as strong shifts of timing and duration of the sea ice retreat and/or salinity changes in surface water at this site, which could cause changes in water stratification that affect nutrient supplies of the upper ocean that modulate growth durations of phytoplankton/coccolithophore productions. Our studies suggest that this subarctic alkenone “SST” proxy record is indicative of the changes of seasonality that control the timing and duration of the blooming seasons of coccolithophores. The alkenone “SST” proxy is also dominantly driven by water stratification effects that, instead of SSTs, reflect most likely a combination of the following local to regional climate and ocean current patterns: (1) the amount of meltwater inputs from high mountain glaciers at Kamchatka; (2) less saline, nutrient-rich Alaskan ... |
format |
Article in Journal/Newspaper |
author |
Pai-Sen Yu Chia-Ju Liao Min-Te Chen Jian-Jun Zou Xuefa Shi A. A. Bosin Sergey A. Gorbarenko Yusuke Yokoyama |
author_facet |
Pai-Sen Yu Chia-Ju Liao Min-Te Chen Jian-Jun Zou Xuefa Shi A. A. Bosin Sergey A. Gorbarenko Yusuke Yokoyama |
author_sort |
Pai-Sen Yu |
title |
Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
title_short |
Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
title_full |
Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
title_fullStr |
Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
title_full_unstemmed |
Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
title_sort |
alkenone surface hydrographic changes of the subarctic northwestern pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences |
publisher |
SpringerOpen |
publishDate |
2020 |
url |
https://doi.org/10.1186/s40645-020-00339-x https://doaj.org/article/e0469d1c2dda44daadccbcf87568eda4 |
long_lat |
ENVELOPE(160.000,160.000,56.000,56.000) |
geographic |
Bering Sea Kamchatka Peninsula Pacific |
geographic_facet |
Bering Sea Kamchatka Peninsula Pacific |
genre |
Bering Sea Kamchatka Kamchatka Peninsula Sea ice Subarctic |
genre_facet |
Bering Sea Kamchatka Kamchatka Peninsula Sea ice Subarctic |
op_source |
Progress in Earth and Planetary Science, Vol 7, Iss 1, Pp 1-13 (2020) |
op_relation |
http://link.springer.com/article/10.1186/s40645-020-00339-x https://doaj.org/toc/2197-4284 doi:10.1186/s40645-020-00339-x 2197-4284 https://doaj.org/article/e0469d1c2dda44daadccbcf87568eda4 |
op_doi |
https://doi.org/10.1186/s40645-020-00339-x |
container_title |
Progress in Earth and Planetary Science |
container_volume |
7 |
container_issue |
1 |
_version_ |
1766378225288609792 |