Holocene environmental history inferred from pollen assemblages in the Huanghe (Yellow River) delta, China: climatic change and human impact

Yi, Sangheon; Saito, Yoshiki; Oshima, Hideaki; Zhou, Yongqing; Wei, Hu

doi:10.1016/s0277-3791(02)00086-0

Cited by 121 publications

(67 citation statements)

References 30 publications

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“…However, Sun and Wang (2005), based on compilation of paleobotanical and lithological data from China, suggested that an initiation of monsoon climate system in East Asia was further back to the latest Oligocene. Subsequently, paleomonsoonal studies have used multi-proxies of loess-paleosols (e.g., An, 2000;An et al, 1990), caves (e.g., Dykoski et al, 2005;Wang et al, 2001), lake sediments (e.g., Nakagawa et al, 2006;Wu et al, 2006;Wűnnemann et al, 2006;Yamada, 2004), ice cores (e.g., Yao et al, 2001), and pollen (e.g., Feng et al, 2006;Makohonienko et al, 2008;Yi et al, 2003aYi et al, , 2003b.…”

Section: Evolution Of the East Asian Monsoonmentioning

confidence: 99%

Holocene Vegetation Responses to East Asian Monsoonal Changes in South Korea

Yi¹

2011

Climate Change - Geophysical Foundations and Ecological Effects

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Section: Evolution Of the East Asian Monsoonmentioning

confidence: 99%

Holocene Vegetation Responses to East Asian Monsoonal Changes in South Korea

Yi¹

2011

Climate Change - Geophysical Foundations and Ecological Effects

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“…at the Taishizhuang peat bog (site 15, Figure 5) [Jin and Liu, 2002;Tarasov et al, 2006] and 4500 cal years B.P. at the delta of the Yellow River (site 14, Figure 5) [Yi et al, 2003]. Pollen records from south-central China have shown that a decrease in subtropical broadleaved evergreen trees, and an increase in trees with greater moisture tolerances, such as the deciduous genera Quercus, Corylus and the coniferous genus Pinus, occurred at 4300 -4200 cal years B.P.…”

Section: Mid-holocene Drying Inferred From Dolomite Precipitation Andmentioning

confidence: 99%

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

Jiang

Liu

2007

J. Geophys. Res.

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[1] To determine the timing and spatial distribution of mid-Holocene drying over northern China, the mineralogical and oxygen isotopic composition of authigenic carbonate from a closed lake at Bayanchagan, southern Inner Mongolia, were measured. Further analysis and synthesis of the spatial geological data were performed. Results from Lake Bayanchagan show a significant drying at 6000 calendar years (cal years) B.P., indicated by dolomite precipitation and a striking rise in d 18 O values. The synthesis of spatial data reveals a zonal distribution for timing of drying over northern China in the mid-Holocene, which began at 9000-7000 cal years B.P. in deserts of north-central China. At 7000-5500 cal years B.P., drying extended into the desert-steppe transitional zone and at $4500 cal years B.P. into northeastern and south-central China. This pattern indicates that the east Asian summer monsoon has significantly retreated southeastward since the mid-Holocene, which may be related to orbitally induced Northern Hemisphere insolation changes. A retreat of $400-550 km is inferred for the front of the summer monsoon from 6500 to 4500 cal years B.P.

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“…The boundary of about 100-150 m depth between these two layers corresponded to the bottom depth of the confined layer of sand and gravel mentioned above. According to the data set of EC, υ 18 O and υD (Figures 2 and 3), different water sources can clearly be indicated, such as enriched isotopes in Layer I and depleted isotopes in Layer II, reflecting a change in climate and environment (Chen et al, 1998(Chen et al, , 2003Yi et al, 2002) and human activities (Liu, 1996;Liu et al, 2001). The layer of 400-550 m depth indicates a possible association with seawater, since the isotopic values are increased and the pH is close to 8Ð4, the average for seawater.…”

Section: Vertical Layering Of Regional Groundwatermentioning

confidence: 99%

“…Climate change and human activity can also be interpreted by isotopic features and/or pollen data (Liu, 1996;Yi et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Spatial geochemical and isotopic characteristics associated with groundwater flow in the North China Plain

Chen

Tang

Sakura

et al. 2004

Hydrological Processes

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Abstract:The North China Plain (NCP) is an important agricultural area in China and has a high population density. Serious water shortages have occurred in this region over the last 20 years. Water transfer from the Yangtze River (the east route) was initiated in the year 2002 to provide water for the major cities of the NCP. This study was carried out before the implementation of the water transfer project, focusing on the spatial integration of the groundwater flow system and geochemical characteristics, which are mainly controlled by tectonics, geomorphology, and lithology. The field survey and the geochemical analyses of the groundwater samples indicated that the groundwater in the NCP has a two-layer structure, with a boundary at a depth of about 100-150 m. The two layers differ in pH, concentrations of SiO 2 and major ions, and isotopes ( 18 O, deuterium and tritium (T)). Chemical components in the upper layer showed a wider range and higher variability than those in the lower layer, indicating the impact of human activity. The flow direction of the groundwater in the upper layer was examined in detail in two profiles, showing that the upper layer flows east towards the Cangzhou-Daming fault, while the groundwater in the lower layer flows northeast towards Tianjin. Three hydrogeological zones are identified: recharge (Zone I), intermediate (Zone II), and discharge (Zone III). The recharge zone was found to be low in chloride (Cl ) but high in T. The discharge zone was found to be high in Cl and low in T. This may be due to the difference in groundwater age. The discharge zone was subdivided into two sub-zones, Zone III 1 and Zone III 2 , by considering the effects of human activities. Zone III 2 was strongly affected by water diversions from the Yellow River. As groundwater flows from the recharge zone to the intermediate and discharge zones, chemical patterns evolve in the order: Ca-HCO 3 > Mg-HCO 3 > Na-Cl C SO 4 .

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Holocene environmental history inferred from pollen assemblages in the Huanghe (Yellow River) delta, China: climatic change and human impact

Cited by 121 publications

References 30 publications

Holocene Vegetation Responses to East Asian Monsoonal Changes in South Korea

Holocene Vegetation Responses to East Asian Monsoonal Changes in South Korea

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

Spatial geochemical and isotopic characteristics associated with groundwater flow in the North China Plain

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