DOI: 10.1016/j.palaeo.2013.12.013
论文题名: Glacial to deglacial ventilation and productivity changes in the southern Okhotsk Sea
作者: Okazaki Y. ; Kimoto K. ; Asahi H. ; Sato M. ; Nakamura Y. ; Harada N.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 395 起始页码: 53
结束页码: 66
语种: 英语
英文关键词: Glacial-deglacial change
; Okhotsk Sea
; Productivity
; Ventilation
英文摘要: As a source region of North Pacific Intermediate Water, the Okhotsk Sea plays an important role in the ventilation of the North Pacific. To understand the detailed oceanographic changes in this marginal sea since the last glaciation, we studied decadal to centennial scale proxy records from new sediment cores from the southwestern Okhotsk Sea. Glacial to Holocene δ14C records of benthic foraminiferal shells suggested enhanced ventilation in the Okhotsk Sea during the early deglacial period between 18 and 15ka, corresponding to Heinrich Event 1. Although the δ14C reconstruction has considerable uncertainties, the Okhotsk Sea may have acted as a source for vigorous ventilation of the subarctic Pacific during this period. CaCO3 preservation events appear to be better explained by the ventilation history of the Okhotsk Sea than by coccolithophores and foraminifera production. CaCO3 preservation started to improve during 18 to 15ka, and pronounced peaks in the CaCO3 content corresponded to the Bølling-Allerød (15 to 13ka) and Preboreal (11.5 to 10ka) warm periods. Diatom and coccolithophore productivity remained low in the Okhotsk Sea throughout the glacial to deglacial periods, different from the situation in the open subarctic Pacific, where high productivity was observed during the Bølling-Allerød period. After the Preboreal period, biogenic opal gradually increased and δ15N decreased in the southern Okhotsk Sea, suggesting that productivity was enhanced by a relaxation of the nitrate limitation. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69480
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Sciences, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581, Japan; Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan; Pusan National University, Busan 609-735, South Korea
Recommended Citation:
Okazaki Y.,Kimoto K.,Asahi H.,et al. Glacial to deglacial ventilation and productivity changes in the southern Okhotsk Sea[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,395