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

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Paleoceanography and Paleoclimatology Pub Date : 2023-07-01 DOI:10.1029/2023PA004615

Jiawei Da, D. Breecker, Tao Li, Gaojun Li, Huayu Lu, Junfeng Ji

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Abstract

Understanding the monsoonal climate over East Asia during the warm Pliocene, the closest analog of the future warm climate, could better inform us of the regional hydrological responses to global climate change. However, the variations and controlling mechanisms of the regional hydrology during this warm period are not determined due to discrepancies among different proxy‐derived records. Here we apply a multiproxy approach based on the geochemistry of calcite nodules from a Red Clay sequence located on the southern edge of the Chinese Loess Plateau. Both the trace metal/Ca ratios and the carbon and oxygen isotopic compositions of calcite nodules show low values during 5.4–4.1 Ma and increased during 4.1–3.3 Ma, together indicating a humid climate during the early Pliocene, the onset of drying starting at ∼4.1 Ma and further intensification at 3.6 Ma. The timings of these hydrological transitions are consistent with global temperature changes, underlining the crucial role of meridional thermal gradient in shaping the regional hydroclimate over East Asia by modulating the strength and position of the East Asian summer monsoon.

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由中国黄土高原方解石结核指示的上新世早期湿润的东亚

了解暖上新世东亚季风气候(最接近未来暖气候的模拟)可以更好地告诉我们区域水文对全球气候变化的响应。然而，由于不同代用记录之间的差异，这一暖期区域水文的变化及其控制机制尚未确定。本文采用基于中国黄土高原南缘红粘土层序方解石结核地球化学特征的多代理方法。方解石结核的微量金属/Ca比值和碳氧同位素组成在5.4 ~ 4.1 Ma期间呈低值，在4.1 ~ 3.3 Ma期间呈上升趋势，表明上新世早期气候湿润，在~ 4.1 Ma开始干燥，在3.6 Ma进一步加剧。这些水文变化的时间与全球温度变化一致，强调了经向热梯度通过调节东亚夏季风的强度和位置，在塑造东亚区域水文气候方面的关键作用。

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来源期刊

Paleoceanography and Paleoclimatology Earth and Planetary Sciences-Atmospheric Science

CiteScore

6.20

自引率

11.40%

发文量

107

期刊介绍： Paleoceanography and Paleoclimatology (PALO) publishes papers dealing with records of past environments, biota and climate. Understanding of the Earth system as it was in the past requires the employment of a wide range of approaches including marine and lacustrine sedimentology and speleothems; ice sheet formation and flow; stable isotope, trace element, and organic geochemistry; paleontology and molecular paleontology; evolutionary processes; mineralization in organisms; understanding tree-ring formation; seismic stratigraphy; physical, chemical, and biological oceanography; geochemical, climate and earth system modeling, and many others. The scope of this journal is regional to global, rather than local, and includes studies of any geologic age (Precambrian to Quaternary, including modern analogs). Within this framework, papers on the following topics are to be included: chronology, stratigraphy (where relevant to correlation of paleoceanographic events), paleoreconstructions, paleoceanographic modeling, paleocirculation (deep, intermediate, and shallow), paleoclimatology (e.g., paleowinds and cryosphere history), global sediment and geochemical cycles, anoxia, sea level changes and effects, relations between biotic evolution and paleoceanography, biotic crises, paleobiology (e.g., ecology of “microfossils” used in paleoceanography), techniques and approaches in paleoceanographic inferences, and modern paleoceanographic analogs, and quantitative and integrative analysis of coupled ocean-atmosphere-biosphere processes. Paleoceanographic and Paleoclimate studies enable us to use the past in order to gain information on possible future climatic and biotic developments: the past is the key to the future, just as much and maybe more than the present is the key to the past.