IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
The environmental magnetic record of palaeoenvironmental variationsduring the past 3100 years: A possible solar influence?
K. Sandeep[1]; R. Shankar[1]; Anish K. Warrier[1]; Zhou,WJ(Zhou,Weijian)[2]; Lu,XF(Lu,Xuefeng)[2]
2015-07
Source PublicationJournal of Applied Geophysics
Volume118Issue:2015Pages:24-36
Subtype期刊论文
AbstractSediments from Pookot Lake (PK) in southern India have provided a record of local environmental changes and catchment processes during the past 3100 cal. years B.P. Variations in the rock magnetic parameters (χlf, χfd, χARM and IRM's at different field strengths) of sediments from two AMS 14C-dated cores reflect climate-induced changes in the catchment of Pookot Lake. Assuming that rainfall is most likely the dominant driving mechanism behind the rock magnetic variations of PK sediments, the environmental history of the site has been reconstructed. Rock magnetic parameters exhibit significant variations during the past 3100 years. The palaeoenvironmental history of the Pookot Lake region may be divided into three phases. During the first phase (~3100 to 2500 cal. years B.P.), catchment erosion and detrital influx were high, indicating a strong monsoon. The second phase, which lasted from 2500 to 1000 cal. years B.P., was characterised by low and steady rainfall, resulting in a low and uniform catchment erosion and detrital influx. Phase 2 was interspersed with brief intervals of strong monsoon and characterised by frequent drying up of the lake. During Phase 3 (~1000 cal. years B.P. to the present), catchment erosion was high, indicating a shift to strong monsoonal conditions. It appears that monsoonal rainfall in the region is influenced by solar activity, with periods of high total solar irradiance being characterised by high rainfall and vice versa; it was relatively low during the Little Ice Age and high during the Medieval Warm Period. The magnetic susceptibility (χlf) data exhibit a number of periodicities which might have a solar origin. The χlf record exhibits similarities with other continental and marine palaeoclimatic records from the region, indicating that regional trends in the monsoon during the Late Holocene are broadly similar.
KeywordRock magnetism Magnetic susceptibility Rainfall Lake sediments Total solar irradiance Spectral analysis
DOI10.1016/j.jappgeo.2015.03.023
Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9628
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.Department of Marine Geology, Mangalore University, Mangalagangotri, 574 199, India;
2.Xi'an AMS Center, Institute of Earth Environment, Xi'an, China
Recommended Citation
GB/T 7714
K. Sandeep[1],R. Shankar[1],Anish K. Warrier[1],et al. The environmental magnetic record of palaeoenvironmental variationsduring the past 3100 years: A possible solar influence?[J]. Journal of Applied Geophysics,2015,118(2015):24-36.
APA K. Sandeep[1],R. Shankar[1],Anish K. Warrier[1],Zhou,WJ,&Lu,XF.(2015).The environmental magnetic record of palaeoenvironmental variationsduring the past 3100 years: A possible solar influence?.Journal of Applied Geophysics,118(2015),24-36.
MLA K. Sandeep[1],et al."The environmental magnetic record of palaeoenvironmental variationsduring the past 3100 years: A possible solar influence?".Journal of Applied Geophysics 118.2015(2015):24-36.
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