Seasonal changes in the formation time of pedogenic carbonates on the Chinese Loess Plateau during Quaternary glacial cycles

Da, Jiawei; Li, Gen K.; Ji, Junfeng

doi:10.1016/j.quascirev.2023.108008

Cited by 5 publications

(8 citation statements)

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“…Specifically, the declines of both Sr/Ca and Mg/Ca indicate lower PCP as a result of higher monsoonal rainfall. The negative shift of δ 18 O c is likely caused by lower rainfall‐δ 18 O during the growing season as the summer monsoon intensified (Da et al., 2023), while the decrease of δ 13 C c can be attributed to enhanced soil respiration and/or decreased δ 13 C of C 3 plants as a result of higher moisture availability (H. Zhou et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Notably, the distributions of the modeled slopes range between 0.69 and 1.02, which are higher than the slope of our Red Clay samples. This is reasonable because calcite nodules consist of pedogenic carbonates precipitating from soil solutions with different initial trace metal/Ca ratios and degrees of PCP over decades to millennia (Da et al., 2023; Zamanian et al., 2016). In this case, the actual regression slope of calcite nodules should be composed of data points from all the modeled lines rather than one, leading to potentially shallower slopes.…”

Section: Discussionmentioning

confidence: 99%

“…In this case, temperature variation is insufficient to explain the ∼2‰ increase of δ 18 O c between 4.5 and 3.3 Ma. Therefore, we suggest the long-term δ 18 O c shifts are mainly due to changes in the δ 18 O of soil water, dominated by the δ 18 O of seasonal rainfall (Da et al, 2023). The incorporation of trace metals into carbonates is determined by the partition coefficient and the compositions of the parent solution:…”

Section: Stable Oxygen Isotopic Compositions Of Calcite Nodules (δ 18...mentioning

confidence: 95%

“…Consequently, pedogenic carbonate captures seasonal rather than mean annual climate (Kelson et al., 2020). A recent study combining isotope analyses and modeling found that the timing of pedogenic carbonate growth on the CLP mainly depends on rainfall and its formation depth through their controls on the calcite saturation state in soil water (Da et al., 2023). Specifically, rainwater dissolves soil carbonate as it passes through the soil column, gradually becoming calcite‐supersaturated and precipitating pedogenic carbonate at depth.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, rainwater dissolves soil carbonate as it passes through the soil column, gradually becoming calcite‐supersaturated and precipitating pedogenic carbonate at depth. Because (a) the monsoonal rainfall mainly occurs during the summer and (b) soil water is already calcite‐supersaturated when reaching the formation depth of nodules (Da et al., 2023), calcite nodules should mostly grow and record climate signals during the summer.…”

Section: Methodsmentioning

confidence: 99%

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A Humid East Asia During the Early Pliocene Indicated by Calcite Nodules From the Chinese Loess Plateau

Breecker

et al. 2023

Paleoceanog and Paleoclimatol

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The East Asian monsoon system dominates the regional hydrology of East Asia, which hosts one-third of the world's population. It is thus critical to quantify the dynamics of the East Asian hydroclimate in the context of anthropogenic warming. The warm intervals of the Pliocene Epoch (5.33-2.58 Ma), including the most intensively studied mid-Pliocene Warm Period (mPWP, 3.264-3.025 Ma), are considered the closest climate analog of the mid-twenty-first century (Burke et al., 2018;Haywood et al., 2016), with atmospheric CO 2 levels ranging between 300 and 450 ppm (de la Vega et al., 2020;Martinez-Boti et al., 2015). A comprehensive understanding of regional climate during this time could better inform us about the potential hydrological variations over East Asia in response to future climate change. Sitting on its northern border, the Chinese Loess Plateau (CLP) captures the nuances of the East Asian summer monsoon (An et al., 2014), manifested by the sizable climatic gradient from southeast to northwest (Figure 1). The Neogene global cooling and the high relief of the Tibetan Plateau led to the desertification of inland Asia and increased meridional thermal gradient (An et al., 2001;Lu et al., 2010;Richter et al., 2022), facilitating the deflation and entrainment of eolian dust from high-latitude deserts to the CLP by the northwesterly surface winds generated by the Siberian high (i.e., winter monsoon) (Maher, 2016). Alternatively, modern observations indicate maximum dust transport in spring dust storms initiated by cold air outbreaks (Roe, 2009). On the other hand, the summer monsoon brings moisture and heat from the low-latitude Indian and Pacific Oceans (Chiang et al., 2020), promoting subsequent pedogenesis. Eolian deposits on the CLP consist of two parts: (a) the Pleistocene loess-paleosol sequence, characterized by fossil soils (paleosols) formed during

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Stable Oxygen Isotopic Compositions Of Calcite Nodules (δ 18...mentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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