http://scholars.ntou.edu.tw/handle/123456789/20657
標題: | Millennial-scale ocean dynamics controlled export productivity in the subtropical North Pacific | 作者: | Li, Dawei Zheng, Li-Wei Jaccard, Samuel L. Fang, Tien-Hsi Paytan, Adina Zheng, Xufeng Chang, Yuan-Pin Kao, Shuh-Ji |
關鍵字: | MERIDIONAL OVERTURNING CIRCULATION;MARINE PRODUCTIVITY;DOME C;SEA;CLIMATE;VARIABILITY;WATER;NUTRIENTS;DUST;CO2 | 公開日期: | 七月-2017 | 出版社: | GEOLOGICAL SOC AMER, INC | 卷: | 45 | 期: | 7 | 起(迄)頁: | 651-654 | 來源出版物: | GEOLOGY | 摘要: | The integrated effects of ocean-climate dynamics on export production in the North Pacific have remained elusive. We present a 91 k.y. export productivity (EP) record based on sedimentary reactive phosphorus from the western subtropical North Pacific. On a millennial time scale, EP decreased during Northern Hemisphere cold events when atmospheric dust loading was high, and increased during warm episodes. The inferred antiphase relation between dust and EP suggests that the supply of macronutrients to the sunlit surface ocean, modulated by the penetration depth of North Pacific Intermediate Water and not eolian Fe, exerted a major control on EP in the subtropical North Pacific. A compilation of global EP records suggests that eolian Fe most likely played a role in stimulating EP regionally only in the Subantarctic zone of the Southern Ocean. Over the past 91 k.y., during the cold-south-warm-north phase of the bipolar seesaw, the biological pump in both hemispheres was enhanced synchronously, yet by different drivers; atmospheric Fe input for the Subantarctic and subsurface macronutrient supply for the North Pacific, including the tropical and/or subtropical Pacific, and the Antarctic zone of the Southern Ocean. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/20657 | ISSN: | 0091-7613 | DOI: | 10.1130/G38981.1 |
顯示於: | 13 CLIMATE ACTION 海洋環境資訊系 14 LIFE BELOW WATER |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。