Spatial variability of the <sup>210</sup>Pb sedimentation rates in the Bohai and Huanghai Seas and its influencing factors

HU Bang-qi; LI Guo-gang; LI Jun; YANG Min; WANG Li-bo; BU Ru-yuan

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HU Bang-qi, LI Guo-gang, LI Jun, YANG Min, WANG Li-bo, BU Ru-yuan. Spatial variability of the 210Pb sedimentation rates in the Bohai and Huanghai Seas and its influencing factors[J]. Haiyang Xuebao, 2011, 33(6): 125-133.

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HU Bang-qi, LI Guo-gang, LI Jun, YANG Min, WANG Li-bo, BU Ru-yuan. Spatial variability of the ²¹⁰Pb sedimentation rates in the Bohai and Huanghai Seas and its influencing factors[J]. Haiyang Xuebao, 2011, 33(6): 125-133.

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Spatial variability of the ²¹⁰Pb sedimentation rates in the Bohai and Huanghai Seas and its influencing factors

1.
Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China;Qingdao Institute of Marine Geology,Qingdao 266071, China
2.
Marine Engineering and Prospecting Institute of North China Sea, North Sea Branch, State Oceanic Administration, Qingdao 266033, China

Received Date: 2010-10-09
Rev Recd Date: 2011-04-07

Abstract

Abstract

A total of 17 box-cores, collected from the Bohai and Huanghai Seas (BHS), were studied to investigate the sedimentation rate (SR) using the ²¹⁰Pb geochronology.The results show that the SRs at the offshore of Huanghe Delta show the highest values(＞2 cm/a), whereas the SRs are always lower than 0.5 cm/a in the Bohai Gulf, the central Huanghai.Combined with the previous studies, the distribution pattern of the ²¹⁰Pb SR in the BHS is obtained, which is mainly controlled by the riverine sediment supply and the marine dynamics conditions.The high SRs are found in the mouths of rivers surrounding the BHS, whereas the offshore areas are characterized by the low SRs. In the northern Shandong Peninsula, the isoline of SRs extended northeastward and decreased stepwise, with the lowest SR areas located at the east Chengshantou. The SRs displayed a concave-like type in the southern Huanghai Sea (SHS), with higher SR on both sides and lower in the central area.In the southwest SH, a ligule-like isoline of SRs extended toward the central SHS. Based on the distribution pattern of the ²¹⁰Pb SR in the southern Bohai and Huanghai Seas, the dispersal pattern of the Huanghe sediments can be illustrated. Most of the Huanghe sediments were deposited within the coastal area. However, small parts of the Huanghe sediments were transported along the northern Shandong Peninsula and through the Bohai Straits into the northern Huanghai Sea. Furthermore, in the SHS, the distribution of the Huanghe sediments may be limited in the west of 123 E areas, whereas the Korean riverine sediments in the east of 125°E, which may be related to the ocean fronts in the southern Huanghai Sea.
- Bohai and Huanghai Seas,
- lead-210 geochronology,
- Huanghe River,
- sediment dispersal

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References(56)

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