Environmental magnetic characteristics of sediments of the western tropical Pacific: Response to the East Asian Winter Monsoon

doi:10.13745/j.esf.sf.2020.5.55

Abstract

Abstract:

The Western Pacific Warm Pool (WPWP) refers to a vast sea area located in the middle and west of the tropical Pacific Ocean (including the southern South China Sea and the Sulu Sea) with an average annual water temperature of over 28 ℃. Covered by the ultra thick layer of warm surface water, with increasing prominence as a global heat source and site of water-vapor exchange, the WPWP plays an important role in driving the thermohaline circulation and regulating global climate change. The East Asian Winter Monsoon (EAWM), on the other hand, is one of the most active components of the global climate system. It can cause deep convection in tropical regions through cold waves, thereby strengthening convective activities and abnormal precipitation in the warm pool area. However, the historical interaction between WPWP and EAWM is still unclear. As aeolian dust carried by the EAWM usually contains large high-coercivity magnetic mineral particles, and these particles can cause fluctuations in environmental magnetic parameters, such as changing the mineralogy, concentration, grain size and morphology of magnetic minerals in sediments, one can assess the historical aeolian mineral inputs and EAWM intensity variations by analyzing the changes of environmental magnetic parameters of pelagic sediments in the WPWP. In this paper, we carried out environmental magnetic measurements on the B10 borehole sediments to reveal the response of the environmental magnetic characteristics of the WPWP sediments to the EAWM. We found the dominant magnetic minerals in the sediments were pseudo-single-domain (PSD) low-coercivity ferrimagnetic magnetite; and some high-coercivity magnetic minerals were also present. We also found the variabilities of high-coercive magnetic mineral content and relative content of fine-grained magnetite were highly correlated during the glacial and interglacial periods and sensitive to the EAWM intensity change: Both high-coercive magnetic mineral content and magnetic grain size increased during the glacial period and decreased during the interglacial period, in accordance with the strengthening and wakening of EAWM intensities during the respective periods.

Key words: western Pacific, East Asian Winter Monsoon, environmental magnetism, magnetite

CLC Number:

HOU Xiaolin, XU Jishang, JIANG Zhaoxia, CAO Lihua, ZHANG Qiang, LI Guangxue, WANG Shuang, ZHAI Ke. Environmental magnetic characteristics of sediments of the western tropical Pacific: Response to the East Asian Winter Monsoon[J]. Earth Science Frontiers, 2022, 29(5): 23-34.

Figures/Tables 6

Fig.1 Location map of study area. Modified after [22].

Fig.2 Age framework of B10 column sediments (the δ18O data of TR163-19 was adapted from [35])

Fig.3 Rock magnetic results of core B10

Fig.4 Day plots. Modified after [38⇓-40].

Fig.5 Environmental magnetic parameters of core B10

Fig.6 Correlation between χ and SIRM

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