| MENG Xianwei,LIU Yanguang,DU Dewen,SHI Xuefa. 2009. Terrestrial flux in sediments from the Okinawa Trough estimated using geochemical compositional data and its response to climate changes over the past 35 000 a. Acta Oceanologica Sinica, (1):47－54 |
| Terrestrial flux in sediments from the Okinawa Trough estimated using geochemical compositional data and its response to climate changes over the past 35 000 a |
| Terrestrial flux in sediments from the Okinawa Trough estimated using geochemical compositional data and its response to climate changes over the past 35 000 a |
| Received:May 21, 2008 Revised:August 08, 2008 |
| DOI： |
| Key words:terrestrial flux sea level change constrained least-squares Heinrich events |
| 中文关键词: terrestrial flux sea level change constrained least-squares Heinrich events |
| 基金项目:The National Natural Science Foundation of China under contract Nos 40431002, 40276024 and 40606016. |
| Author Name | Affiliation | E-mail | | MENG Xianwei | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | mxw@fio.org.cn | | LIU Yanguang | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | DU Dewen | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | SHI Xuefa | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| Terrestrial supply to marginal seas is a function of interaction between land and ocean in response to climate changes. Terrestrial flux in sediments, therefore, is potential not only to reflect the paleoceanographic evolution of sedimentary basin, but also to reveal the paleoclimatic changes in source regions. Sediments from the Okina-wa Trough were quantitatively partitioned into terrestrial, volcanic and biogenitic end members using constrained least-squares technique for geochemical compositional data. Combined with the density of bulk sediments and sedimentation rate, the terrestrial flux in sediments from the Okinawa Trough since the last 35 000 a was esti-mated. Based on surface seawater temperature (SST) and sea level changes over the past 35 000 a, the re-sponse of terrestrial flux to the climate changes was discussed. It is demonstrated that the terrestrial supply to the Okinawa Trough mainly derived from Chinese landmass via the Changjiang (Yangtze) River and controlled by sea level changes. During the post-glaciation, the terrestrial flux was the lowest in response to the highest sea level stand. During the last glacial maximum (LGM), the terrestrial flux was not so high as previously expec-ted, indicating the arid climatic condition in source region was responsible for lowering the Changjiang River's runoff during that time. During the deglaciation, the terrestrial flux increased in response to a quick rising of the sea level, probably implicating occurrence of down-slope transport. The four events characterized by slight in-crease in terrestrial flux exactly correspond to the LGM, Heinrich events (H1, H2, H3), respectively. |
| 中文摘要: |
| Terrestrial supply to marginal seas is a function of interaction between land and ocean in response to climate changes. Terrestrial flux in sediments, therefore, is potential not only to reflect the paleoceanographic evolution of sedimentary basin, but also to reveal the paleoclimatic changes in source regions. Sediments from the Okina-wa Trough were quantitatively partitioned into terrestrial, volcanic and biogenitic end members using constrained least-squares technique for geochemical compositional data. Combined with the density of bulk sediments and sedimentation rate, the terrestrial flux in sediments from the Okinawa Trough since the last 35 000 a was esti-mated. Based on surface seawater temperature (SST) and sea level changes over the past 35 000 a, the re-sponse of terrestrial flux to the climate changes was discussed. It is demonstrated that the terrestrial supply to the Okinawa Trough mainly derived from Chinese landmass via the Changjiang (Yangtze) River and controlled by sea level changes. During the post-glaciation, the terrestrial flux was the lowest in response to the highest sea level stand. During the last glacial maximum (LGM), the terrestrial flux was not so high as previously expec-ted, indicating the arid climatic condition in source region was responsible for lowering the Changjiang River's runoff during that time. During the deglaciation, the terrestrial flux increased in response to a quick rising of the sea level, probably implicating occurrence of down-slope transport. The four events characterized by slight in-crease in terrestrial flux exactly correspond to the LGM, Heinrich events (H1, H2, H3), respectively. |
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