Deglacial changes in the strength of deep southern component water and sediment supply at the Argentine continental margin
Deglacial changes in the strength of deep southern component water and sediment supply at the Argentine continental margin
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阿根廷大陆边缘南部深层水和沉积物供应强度的冰消变化
DOI:
10.1002/2016pa003079
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Lantzsch
中科院分区:
文献类型:
--
作者:
Warratz;Henrich;Chiessi;Lantzsch
The deep southern component water (SCW), comprising Lower Circumpolar Deep Water (LCDW) and Antarctic Bottom Water (AABW), is a major component of the global oceanic circulation. It has been suggested that the deep Atlantic water mass structure changed significantly during the last glacial/interglacial cycle. However, deep SCW source‐proximal records remain sparse. Here we present three coherent deep SCW paleocurrent records from the deep Argentine continental margin shedding light on deep water circulation and deep SCW flow strength in the Southwest Atlantic since the Last Glacial Maximum (LGM). Based on increased sortable silt values, we propose enhanced deep SCW flow strength from 14 to 10 cal ka B.P. relative to the early deglacial/LGM and the Holocene. We propose a direct influence of deep northern component water (NCW) on deep SCW flow strength due to vertical narrowing of deep SCW spreading, concurrent with a migration of the high‐energetic LCDW/AABW interface occupying our core sites. We suggest a shoaled NCW until 13 cal ka B.P., thereby providing space for deep SCW spreading that resulted in reduced carbonate preservation at our core sites. Increased carbonate content from 13 cal ka B.P. indicates that the NCW expanded changing deep water properties at our core sites in the deep Southwest Atlantic. However, southern sourced terrigenous sediments continued to be deposited at our core sites, suggesting that deep SCW flow was uninterrupted along the Argentine continental margin since the LGM.
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影响因子:
5.3
作者:
T. Stichel;M. Frank;J. Rickli;B. Haley
通讯作者:
T. Stichel;M. Frank;J. Rickli;B. Haley
DOI:
10.1016/j.palaeo.2016.09.018
发表时间:
2016
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
作者:
Chiessi;Henrich
通讯作者:
Henrich
影响因子:
5.3
作者:
L. Jonkers;R. Zahn;Alexander L. Thomas;G. Henderson;W. Abouchami;R. Francois;P. Masqué;I. Hall;T. Bickert
通讯作者:
T. Bickert
影响因子:
56.9
作者:
J. Lynch‐Stieglitz;J. Adkins;W. Curry;T. Dokken;I. Hall;J. Herguera;J. Hirschi;E. Ivanova;
通讯作者:
J. Lynch‐Stieglitz;J. Adkins;W. Curry;T. Dokken;I. Hall;J. Herguera;J. Hirschi;E. Ivanova;
影响因子:
5.3
作者:
James A. Smith;C. Hillenbrand;C. Pudsey;C. Allen;A. Graham
通讯作者:
A. Graham