A5071517122- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Pleistocene-Era Hominins and Archaeology
- Isotope Analysis in Ecology
- Marine and environmental studies
- Climate variability and models
- Tree-ring climate responses
- Geological formations and processes
- Geophysics and Gravity Measurements
- Landslides and related hazards
- Aeolian processes and effects
- Archaeology and ancient environmental studies
- Geomagnetism and Paleomagnetism Studies
- Climate change and permafrost
- Geological and Geophysical Studies
- Arctic and Antarctic ice dynamics
- Soil Carbon and Nitrogen Dynamics
- Scientific Research and Discoveries
- Pacific and Southeast Asian Studies
- Paleontology and Stratigraphy of Fossils
- earthquake and tectonic studies
- Soil and Unsaturated Flow
- Plant Ecology and Soil Science
- Soil erosion and sediment transport
UCLouvain
2015-2025
Institute of Tibetan Plateau Research
2024
Chinese Academy of Sciences
2006-2024
University of Chinese Academy of Sciences
2024
KU Leuven
2024
Institute of Geology and Geophysics
2006-2008
Abstract. The global climate system experienced a series of drastic changes during the Cenozoic. In Asia, these include transformation from zonal pattern to monsoon-dominated pattern, disappearance typical subtropical aridity, and onset inland deserts. Despite major advances in last two decades characterizing understanding phenomena, disagreements persist relative timing, behaviors underlying causes. This paper addresses issues mainly based on lines evidence. First, we compiled newly...
Interglacials, including the present (Holocene) period, are warm, low land ice extent (high sea level), end-members of glacial cycles. Based on a level definition, we identify eleven interglacials in last 800,000 years, result that is robust to alternative definitions. Data compilations suggest despite spatial heterogeneity, Marine Isotope Stages (MIS) 5e (last interglacial) and 11c (~400 ka ago) were globally strong (warm), while MIS 13a (~500 was cool at many locations. A step change...
Abstract The mid-Pleistocene transition (MPT) is widely recognized as a shift in paleoclimatic periodicity from 41- to 100-kyr cycles, which largely reflects integrated changes global ice volume, sea level, and ocean temperature the marine realm. However, much less known about monsoon-induced terrestrial vegetation change across MPT. Here, on basis of 1.7-million-year δ 13 C record loess carbonates Chinese Loess Plateau, we document unique MPT reflecting dominant 23-kyr before 1.2 Ma...
Abstract. We correlate the China loess and Antarctica ice records to address inter-hemispheric climate link over past 800 ka. The results show a broad coupling between Asian Antarctic climates at glacial-interglacial scale. However, number of decoupled aspects are revealed, among which marine isotope stage (MIS) 13 exhibits strong anomaly compared with other interglacials. It is characterized by unusually positive benthic oxygen (δ18O) carbon (δ13C) values in world oceans, cooler...
Abstract. The last interglaciation (~130 to 116 ka) is a time period with strong astronomically induced seasonal forcing of insolation compared the present. Proxy records indicate significantly different climate that modern, in particular Arctic summer warming and higher eustatic sea level. Because forcings are relatively well constrained, it provides an opportunity test numerical models which used for future prediction. In this paper we compile set model simulations early (130 125 ka),...
Abrupt cooling is observed at the end of interglacials in many paleoclimate records, but mechanism responsible remains unclear. Using model simulations, we demonstrate that there exists a threshold level astronomically induced insolation below which abrupt changes past 800,000 years occur. When decreasing reaches critical value, it triggers strong, weakening Atlantic meridional overturning circulation and cooler mean climate state accompanied by high-amplitude variations lasting for several...
Numerous proxy reconstructions have provided general insight into late Quaternary East Asian Monsoon variability. However, challenges persist in precisely assessing absolute temperature impacts on variations. Here, we use two independent paleothermometers, based bacterial membrane lipids and clumped isotopes of snail shells, the same section western Chinese Loess Plateau to establish a robust land surface record spanning past approximately 21,000 years. Our records consistently reveal (i)...
Abstract The polar oceans play a vital role in regulating atmospheric CO 2 concentrations ( p ) during the Pleistocene glacial cycles. However, despite being largest modern reservoir of respired carbon, impact subarctic Pacific remains poorly understood due to limited records. Here, we present high-resolution, 230 Th-normalized export productivity records from northwestern covering last five Our display pronounced, glacial-interglacial cyclicity superimposed with precessional-driven...
Abstract. The dominant modes of variability precipitation for the whole China over past millennium and mechanism governing their spatial structure remain unclear. This is mainly due to insufficient high-resolution proxy records in western China. Numerous tree-ring chronologies have recently been archived publicly available databases through PAGES2k activities, these provide an opportunity refine field reconstructions Based on 479 records, including 371 width chronologies, a isotope...
Abstract Identifying the position of Current Warm Period (CWP) in context long‐term climatic trend is vital for understanding impact human activity on climate change. Reconstructions summer temperature and precipitation eight subregions China over past 22,000 years show that CWP these are all lower than Early to Middle Holocene. The timing Holocene peaks northern (including Northwest China, North Northeast China) mainly determined by orbital forcing. Greenhouse gas forcing land ice‐sheet...
Abstract Airborne mineral dust is sensitive to climatic changes, but its response orbital forcing still not fully understood. Here, we present a reconstruction of input the Subarctic Pacific Ocean covering past 190 kyr. The composition record indicative source moisture conditions, which were dominated by precessional variations. In contrast, flux obliquity variations and displays an out‐of‐phase relationship with from mid‐latitude North Ocean. Climate model simulations suggest precession...
Abstract. The δ18O record in deep-sea sediments show a significant reduced amplitude of the ice volume variations before Marine Isotope Stage 11, about 400 ka ago, with less warm interglacials and cold glacials. deuterium temperature greenhouse gases records Antarctic cores same feature. As reduction climate concentration BP is present both cores, it tempting to conclude that this worldwide phenomenon. This not necessarily true, at least as far some records, particular China Europe, are...
Abstract. An Earth System Model of Intermediate Complexity is used to investigate the role insolation and size ice sheets on regional global climate marine isotope stage (MIS) 13. The astronomical forcing selected at two dates with opposite precession, one when northern hemisphere (NH) summer occurs perihelion (at 506 ka (1 ka=1000 years) BP), other it aphelion 495 BP). Five different volumes Eurasian sheet (EA) North American (NA), ranging from 0 Last Glacial Maximum (LGM) one, are used....
Abstract. This paper presents a detailed analysis of the climate last interglacial simulated by two models different complexities, CCSM3 (Community Climate System Model 3) and LOVECLIM (LOch-Vecode-Ecbilt-CLio-agIsm Model). The surface temperature, hydrological cycle, vegetation ENSO variability during are analyzed through comparison with pre-industrial (PI) climate. In both models, period is characterized significant warming (cooling) over almost all continents boreal summer (winter)...
Abstract The relative influence of insolation, CO 2 , and ice sheets on the East Asian summer monsoon (EASM) is not well understood especially at regional scale. Here a Gaussian emulator based simulations with HadCM3 used to quantitatively assess how astronomical forcing, northern hemisphere affect variation precipitation over last 800 ky. Our results show that in EASM domain north 25°N, dominated by precession, leading strong 23‐ky cycles, while only modulate effect insolation influencing...