Yao Wu

Universität Heidelberg · Institute of Environmental Physics

Siberia and Central Asia are located at mid- to high latitudes and encompass a large landlocked area of the Eurasian continent containing vast tracts of permafrost (seasonal permafrost and permafrost), which is extremely sensitive to global climate change. However, previous research has scarcely investigated the changes in the paleoclimate in this...

Siberia and Central Asia are located at middle to high latitudes, encompassing a large landlocked area of the Eurasian continent and vast tracts of permafrost, which are sensitive to global climate change. Here, we investigated the data from 15 Global Network of Isotopes in Precipitation (GNIP) stations to clarify the relationship between precipita...

The stalagmite laminae, as a common karst sedimentary formations, responds to the changes of climate and environment. Because of its characteristics such as ultra-high resolution and accurate dating, it has been widely used in paleoclimate and paleoenvironment reconstruction. This study is on the basis of stalagmite laminae studies that have been p...

Climate change during the Little Ice Age (LIA) was characterized by globally widespread but spatiotemporally incoherent cooling with high regional variability. However, the onset, termination, internal structure, and underlying forcing mechanisms of the LIA remain unclear. Here we present a U-Th-dated stalagmite record with an average sampling reso...

Plain Language Summary While it is well known that global changes have led to variations in the intensity and spatial distribution of Asian monsoon precipitation, the mechanisms behind this are not well understood. Paleoclimate records are essential for revealing the drivers behind monsoon variation. However, speleothem records from the Asian monso...

The stable isotopic composition (δ18Op and δDp) of rainwater has been considered an effective proxy in studying atmospheric circulation and hydrological cycle processes. However, the linkage between variabilities in moisture sources and δ18Op remains poorly understood in Southwest China. Here, we utilized three long-term (10-year) δ18Op records (Be...

Hydrogen ($\delta$2H) and oxygen ($\delta$18O) isotopes of water extracted from speleothem fluid inclusions are important proxies used for paleoclimate reconstruction. In our study we use a cavity ring-down laser spectroscopy system for analysis and modified the approach of Affolter et al. (2014) for sample extraction. The method is based on crushi...

Stalagmite d 18 O Heinrich stadials 4 Asian summer monsoon Trace elements Spatial difference of hydroclimate a b s t r a c t The iceberg melting-induced Heinrich events (HEs), which were first reported in 1988, caused a series of centennial-millennial global climate changes during the last glacial period. The patterns and details of low-latitude mo...

For the reconstruction of palaeoclimate based on stalagmites, the deposition process at isotopic equilibrium fractionation (IEF) has been considered as an important prerequisite. Systematic monitoring was performed on the drip water, cave air parameters, active speleothem (AS) deposition rate and d18O and d13C values of the AS in Furong cave, Chong...

Rapid permafrost degradation and peatland expansion occurred in Eurasia during the Early Holocene and may be analogous to the region’s response to anthropogenic warming. Here we present a 230Th-dated, multiproxy speleothem record with subdecadal sampling resolution from Kyok-Tash Cave, at the modern permafrost margin in the northern Altai Mountains...

It is conducive to the sustainable development of human beings in karst regions to research the mechanism of karst rocky desertification (KRD) expansion. Whether the large-scale KRD in southwestern China is caused by climate change or human activities is still controversial. In this study, the evolution of the KRD in southwestern China over the pas...

The ²³⁰Th dating (²³⁸U–²³⁴U–²³⁰Th dating method) has become one of the most important dating methods for Quaternary research. However, the ²³⁰Th/²³²Th ratio of 4.4 ± 2.2ⅹ10⁻⁶ is widely used for age correction in ²³⁰Th dating method. Here, we collected active speleothems with exactly known age and zero-year-old calcium carbonate from caves and dated...

Comprehensive comparison of paleoclimate change based on records constrained by precise chronology and high-resolution is essential to explore the correlation and interaction within earth climate systems. Here, we propose a new stalagmite-based multidecadal resolved Asian summer monsoon (ASM) record spanning the past thirty-seven thousand years (ka...

The frequent alternation between droughts and floods in the karst regions of Southwestern China has a serious impact on the ecological environment and socioeconomic development. Although some high-resolution records for this region have been published, there is a lack of multi-proxy geological records that could be used to reconstruct the relations...

The 4.2 ka event is one of the most salient features of global climate change in the mid-late Holocene and influenced on the evolution of ancient civilizations. Although a lot of paleoclimate reconstructions have focused on it, the detailed structure and driving mechanism of the 4.2 ka event is still unclear. In this study, the variation of Asian s...

The geochemical compositions of cave drip water and speleothems such as Mg, Sr, Mg/Ca, Sr/Ca, and ⁸⁷Sr/⁸⁶Sr are considered to be responsive to changes in the local climate and hydrological conditions. Systematic monitoring was performed on the Mg and Sr contents, Mg/Sr ratio and ⁸⁷Sr/⁸⁶Sr of soil, soil water, cave drip water, and the active speleot...

小冰期是过去一千年中全球气候变化的重要事件之一。关于小冰期时中国季风区和西风影响区气候变化的对比研究众多,但是缺乏中国南方地区降水模式时空差异的研究,难以了解中国南方地区降水变化规律。为了系统地了解小冰期时中国南方地区降水的复杂性,本文将中国南方地区划分为东南—华南沿海地区、中部地区以及西南地区三个区域,总共选取了19 条高分辨率的古气候记录进行对比研究,主要有以下几点认识:① 相对于中世纪暖期而言,小冰期期间中国南方东南—华南沿海地区的气候偏湿,这可能与雨带在中国南方的滞留时间延长和 沿海地区受台风的影响增强有关。 ② 中国中部地区秦岭南麓和神农架高山林区在小冰期时期主要呈“冷湿”的模式,差异在于秦岭南麓区域主要在小冰期中后期偏湿,这与中部其他区域偏“冷干”的模式不同。这种区域差异可能是由...

Stalagmites are the product of the combined effects of the surface environment and the cave environment, and their stable carbon and oxygen isotope ratios (δ¹⁸O and δ¹³C) have been widely used as proxies for palaeoclimatic and palaeoenvironmental reconstructions. Modern cave monitoring is essential for the accurate interpretation of multiple-proxie...