Testing the magnetic proxy χFD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China

Liu, Zhifeng; Liu, Qingsong; Torrent, J.; Barrón, Vidal; Hu, Pengxiang

doi:10.1016/j.gloplacha.2013.04.013

Cited by 74 publications

(67 citation statements)

References 60 publications

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“…In this study, the reconstructed precipitation is time averaged, not yearly, and there are also errors in sampling/mixing/ bioturbation which are not calculated (Balsam et al, 2011). The model is linear (MAP = 8.06 × χ FD /HIRM + 254) in this study and error is ±70 mm for the calibration (Liu et al, 2013). The error of χ FD /HIRM from each sub-horizon can be propagated to MAP (MAP = f(x)) by the following equation: ΔMAP =f′(x)Δx (ΔMAP is the error of MAP propagated from χ FD /HIRM; f′(x) is the derivative of f(x); Δx is the error of χ FD /HIRM from each sub-horizon); As these two kinds of error are irrelevant, the total error is the root sum of the squares of them.…”

Section: Methodsmentioning

confidence: 94%

“…Previous studies have shown that χ FD and HIRM are positively correlated for typical soil profiles (developed in well-drained, neutral and oxic environments) (Liu et al, 2013). The loess/paleosol horizons from LC and SMX L1-S5 sequences were divided into 19 and 16 magnetically enhanced sub-horizons (for a single loess/paleosol unit, it may contain several sub-horizons that formed in different climate condition; L1 in LC loess for example, it contains L1L1, L1L2, L1S1, and L1S2), respectively.…”

Section: Scatter Plots Of χ Fd -Hirm Of Lc and Smxmentioning

confidence: 96%

“…The loess/paleosol horizons from LC and SMX L1-S5 sequences were divided into 19 and 16 magnetically enhanced sub-horizons (for a single loess/paleosol unit, it may contain several sub-horizons that formed in different climate condition; L1 in LC loess for example, it contains L1L1, L1L2, L1S1, and L1S2), respectively. A linear fitting slope of χ FD /HIRM was calculated for each sub-horizon, and the paleoprecipitation reconstructed based on the climofunction: MAP = 8.06 × χ FD /HIRM − 254 (R 2 = 0.92) (Liu et al, 2013).…”

Section: Scatter Plots Of χ Fd -Hirm Of Lc and Smxmentioning

confidence: 99%

“…The fitting ratio Hm/χ FD of each soil profile represents the information of the whole soil profile and can largely remove the signal from the parent materials . Based on the above studies Liu et al, 2007), Liu et al (2013) systematically investigated the magnetic properties of 11 modern soil profiles (MAP is 300-1300 mm) along a north-south transect in Shaanxi province, China, and found that χ FD and HIRM ("hard" isothermal remanent magnetization) values were linearly correlated in each soil profile. The linear fitting ratios χ FD /HIRM positively correlate with MAPs, and a climofunction was built between χ FD /HIRM and MAP: MAP = 8.06 × χ FD /HIRM + 254, R 2 = 0.92.…”

Section: Introductionmentioning

confidence: 99%

“…The objectives of this study are to 1) reconstruct paleoprecipitation of Luochuan (LC) and Sanmenxia (SMX) loess/paleosol sequences (L1-S5, where L1 represents the first loess horizon and S5 the fifth paleosol horizon) using the newly-proposed climofunction (Liu et al, 2013); and 2) provide a better understanding of the evolution of paleoprecipitation, and in turn the Asian summer monsoon in East Asia since the formation of S5 (~620 ka).…”

Section: Introductionmentioning

confidence: 99%

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Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

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Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Methodsmentioning

confidence: 94%

Section: Scatter Plots Of χ Fd -Hirm Of Lc and Smxmentioning

confidence: 96%

Section: Scatter Plots Of χ Fd -Hirm Of Lc and Smxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

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Magnetism of a red soil core derived from basalt, northern Hainan Island, China: Volcanic ash versus pedogenesis

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Wei

et al. 2017

JGR Solid Earth

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Similar to loess‐paleosol sequences in northwestern China, terrestrial sedimentary sequences (red soils) in southern China also provide sensitive Quaternary records of subtropical/tropical paleoclimate and paleoenvironment. Compared with red clay sequences originated from eolian dust, red soils derived from bedrock have received little attention. In this study, a long core of red soil derived from weathered basalt in northern Hainan Island, China, was systematically investigated by using detailed magnetic measurements and rare earth element analyses. The results show that an extremely strong magnetic zone with a maximum magnetic susceptibility (>10 × 10−5 m3 kg−1) is interbedded in the middle of the core profile. This layer contains a significant amount of superparamagnetic magnetite/maghemite particles that primarily originated from volcanic ash, with secondary contributions from pedogenesis. The former has an average grain size of ~19 nm with a normal distribution of volume, and the latter has a much wider grain size distribution. The presence of volcanic ash within the red soil indicates that these Quaternary basalts were not formed by continuous volcanic eruptions. Moreover, the magnetic enhancement patterns differ between the upper and lower zones. The upper zone is more magnetically enhanced and experienced higher precipitation and temperature than the lower zone. Discrimination of superparamagnetic particles originating from pedogenic processes and volcanic ash thus provides a sound theoretical base for accurate interpretation of magnetism in red soils in this region.

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Variations in the Iron Mineralogy of a Loess Section in Tajikistan During the Mid‐Pleistocene and Late Pleistocene: Implications for the Climatic Evolution in Central Asia

Jia

Wang

et al. 2018

Geochem Geophys Geosyst

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The loess sequences in Tajikistan are an important archive of information about the development of climate and atmospheric circulation in central Asia during the Pleistocene. Here we present the results of an iron mineralogical study of a loess sequence in Tajikistan to reconstruct paleoclimate evolution during the mid‐Pleistocene and late Pleistocene. The record indicates that interglacial intervals were relatively humid and glacials were dry. We propose a shift in the character of the interglacial climate of the region to more humid after beginning of MIS 9; however, temperature was relatively stable. The location and intensity of Westerlies have a close link with Asian Summer Monsoon (ASM) circulations. From the beginning of MIS 9, there was a southward movement of the Westerlies circulation, which corresponded to a retreat of the Indian Summer Monsoon (ISM). A similar relationship also existed between the East Asian Summer Monsoon (EASM) circulation and the Westerlies, which is evidenced by the formation of the most weakly developed soil unit in the EASM‐dominated regions during MIS 9, in contrast with the formation of the most strongly developed soil unit in the Westerlies‐dominated regions. As conditions in the areas of loess deposition became more humid, the sedimentary basins which are the dust source areas became progressively more arid. The aridification of the source areas may be the result of increased Northern Hemisphere ice volume and accelerated high mountains and/or plateaus uplift in the surrounding regions.

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Testing the magnetic proxy χFD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China

Cited by 74 publications

References 60 publications

Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

Quantifying paleoprecipitation of the Luochuan and Sanmenxia Loess on the Chinese Loess Plateau

Magnetism of a red soil core derived from basalt, northern Hainan Island, China: Volcanic ash versus pedogenesis

Variations in the Iron Mineralogy of a Loess Section in Tajikistan During the Mid‐Pleistocene and Late Pleistocene: Implications for the Climatic Evolution in Central Asia

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