Shiming Wan

Chinese Academy of Sciences | CAS · Key Laboratory of Marine Geology and Environment

Recent research has suggested that East Asia has experienced a prevailing monsoon climate since the Eocene. However, there is little knowledge about the development of the East Asian monsoon system before the Miocene, particularly in southern China, due to a lack of well‐dated continuous sediment records. Here, we present new magnetic proxy records...

摘要 亚洲内陆是全球第二大风尘源区, 其构造和气候演化对区域和全球气候环境有重要影响. 西太平洋是亚洲风尘向东输送的主要沉积汇. 黏土矿物作为容易长途搬运的细颗粒大陆风化产物, 被广泛应用于古气候和风化历史重建, 但亚洲大区域范围、长时间尺度黏土矿物记录的整体演化趋势及响应机制还不甚清晰. 我们利用西太平洋深海钻探计划(DSDP)292和296站位两个长尺度、连续、高分辨率沉积物岩芯的黏土矿物和Sr-Nd同位素组成,约束了沉积物来源, 并重建了渐新世以来风尘源区的干旱演化历史. 结果表明, 菲律宾海黏土粒级沉积物主要为亚洲内陆风尘和西太平洋岛弧风化产物的混合. 基于黏土矿物组成及风尘通量等指标重建, 揭示出中亚风尘源区自晚渐新世以来持续干旱化, 在约20、14、7和3Ma出现阶段性干旱化加剧...

As the second largest dust source on the globe, the tectonic and climatic evolution of continental Asia has an important impact on regional and global climate change. The West Pacific is the main sediment sink for eolian dust transported eastward from the Asian interior. Clay minerals, as the major fine-grained weathering products of continental ro...

Anthropogenic impacts on weathering processes in the late Holocene have been widely demonstrated in recent studies, but the mechanism by which enhanced chemical weathering is linked to human activity remains unclear. In this study, we present a comprehensive reconstruction of sediment provenance, chemical weathering, vegetation type and evidence of...

The emergence and expansion of terrestrial C4 vegetation represent the most striking evolutionary adaptation of ecosystems to climate change during the Cenozoic. However, the long-term history of terrestrial C4 ecosystem expansion in East Asia remains poorly documented, and its links to tectonic and/or climate changes remain unclear due to the comp...

Enhanced silicate weathering induced by the uplift of the Himalayan-Tibetan Plateau (HTP) has been considered as the major cause of pCO2 decline and Cenozoic cooling. However, this hypothesis remains to be validated, largely due to the lack of a reliable reconstruction of the HTP weathering flux. Here, we present a 37-million-year record of the dif...

Plain Language Summary Tropical rainfall systems in the Indo‐Pacific Warm Pool (IPWP) play a significant role in transferring energy and moisture. However, their millennial‐scale variabilities in precipitation during the past remain poorly understood. Here, we provide sub‐millennial sediment mineralogy and elemental reconstructions spanning the las...

Quaternary Asian low-latitude hydroclimate cyclicity has long been attributed to insolation forcing, in contrast to the dominant ice-sheet and CO 2 controls identified in mid-high-latitude regions. However, debates exist regarding these rainfall variations and forcings due to inconsistent reconstructions and simulations. Here, by combining rainfall...

Plain Language Summary Deciphering the interactions between processes in the Northern and Southern hemispheres is crucial for understanding the mechanisms of paleoclimate change, and therefore for predicting future climate evolution. Resolving the nature of such interactions requires high‐resolution datasets from key components of the system. To th...

The International Ocean Discovery Program (IODP) conducted a series of expeditions between 2013 and 2016 that were designed to address the development of monsoon climate systems in Asia and Australia. Significant progress was made in recovering Neogene sections spanning the region from the Arabian Sea to the Sea of Japan and southward to western Au...

The Pearl River drains the South China Block and delivers large amounts of sediments to the northern South China Sea, and its development can be closely linked to the regional paleoenvironmental changes. However, the evolutionary history of the Pearl River has been poorly understood, mainly because of the lack of continuous and high-resolution sedi...

Plain Language Summary The Northern Hemisphere Westerly wind is a significant component of planetary‐scale atmospheric circulation and has a large impact on regional and global climate change. Although numerous modern observations and orbital time‐scale studies of the Westerly wind have been conducted, we still know little about its evolution on mi...

The Eocene was a critical period of global plate reorganization and it also saw the Earth's climate transition from the warmhouse state to the coolhouse state. Reconstructing the Eocene sedimentary history in the climate-sensitive Southern Ocean is important for understanding paleoenvironmental changes in response to the accelerated Australia/Antar...

International Ocean Discovery Program (IODP) conducted a series of expeditions between 2013 and 2016 that were designed to address the development of monsoon climate systems in Asia and Australia. Significant progress was made in recovering Neogene sections spanning the region from the Arabian Sea to the Japan Sea and southward to western Australia...

Oceanic anoxic event 1d (OAE 1d) has been well studied at northern low latitudes (i.e., in Tethys and the North Atlantic); however, the paleoenvironmental response to this event at high latitudes has not been documented and the triggering mechanism remains unknown. Here, we address both of these shortcomings by presenting the first detailed sedimen...

We examined an International Ocean Discovery Program (IODP) drilling core from Site U1501, located on the distal margin of the northern South China Sea (SCS) basin to unravel the sediment provenance evolution in the Paleogene and the evolution of river catchments during basin opening. We attempt to understand the major factors driving river develop...

Oxygen content in deep ocean plays a vital role in biogeochemical processes and has significant impacts on global carbon cycle. The Japan Sea is a semi-closed basin with only shallow water connection to the Western North Pacific, and its redox history has been sensitively affected by tectonic and climatic changes in the past. Studies of paleo-redox...

Plain Language Summary Sediments that accumulate in the ocean along continental margins contain the minerals that were eroded and transported by rivers on the nearby land masses. Past changes in the composition of such sediments can be used to reconstruct the history of physical erosion and chemical weathering on the continents, but can also be aff...

The distribution and evolution of C4 plants are closely related to climate change. However, with the development of agriculture, to what extent human activities affect the natural environment and play an important role in controlling C3/C4 vegetation remains unclear. In this study, the carbon isotopic composition of black carbon (BC) extracted from...

Plain Language Summary The high‐latitude North Pacific is an important region where ocean interacts with the atmospheric carbon cycle. CO2 outgassing from the interior ocean of North Pacific to the surface is mainly controlled by the upwelling as well as the biological productivity determined by the NPIW formation. Relationship between changes in t...

Both the East Asian winter monsoon (EAWM) and El Niño (EN) activities are vital climate modes that regulate the Pacific hydrologic cycle. However, the Holocene interactions among the EAWM, EN activities, and tropical Pacific precipitation remain unclear due to the lack of appropriate EAWM proxies. Here, we present high-resolution grain size records...

Modern source-to-sink processes in the southern South China Sea (SCS) remain poorly understood. In this study, clay minerals and magnetic properties are used to identify the sources and transport pathways of surface sediments in the southern SCS. The distributions of four clay mineral species in the deep southern SCS are mainly controlled by sedime...

The Oligocene-Miocene boundary Asian climatic reorganization linked to the northward migration of the East Asian monsoon into subtropical China is a potentially important but poorly constrained atmospheric CO2 consumption process. Here, we performed a first-order estimate of the CO2 consumption induced by silicate chemical weathering and organic ca...

Reconstructing the Cenozoic sedimentary history of the Bay of Bengal (BoB) is significant for understanding the evolutionary history of South Asian river systems and the links between river development, tectonic deformation and global climate change. Here, we present the first long-term clay mineral record combined with Sr-Nd isotopic compositions...

The Himalayan and Tibetan highlands (mountains), with high rates of physical erosion, are extreme settings for earth surface processes, generating one of the largest recent terrigenous detritus and organic carbon discharges to the ocean. However, their significance with respect to the global carbon and climate cycles during the Quaternary is still...

A multi-proxy study including organic carbon and bulk nitrogen isotopes along with major and trace element concentrations in sediments from Integrated Ocean Drilling Program (IODP) Sites U1425 and U1430 in the Japan Sea has been conducted in order to trace deep-water evolution in the Japan Sea and the North Pacific since the late Miocene. The high...

Shelf mud is an important sink for fluvial sediment, and it is sensitive to variations in river discharge and ocean circulation, which are significantly influenced by climate change. However, the evolution of shelf mud in response to climate change during the Holocene is poorly understood. Here, we present high‐resolution sedimentary records of hea...

The Quaternary East Asian summer rainfall evolution reconstructed with the Chinese speleothem d 18 O records shows the consistency throughout the region of East Asia, and has long been considered equivalent to the monsoon intensity. Its variation and teleconnection with global climate were usually interpreted by the meridional shift of the intertro...

Abstract Chemical weathering of silicate rocks on continents is thought to have played an important role in the evolution of past atmospheric carbon dioxide over geologic timescales. However, the detailed links between continental weathering and climate change over shorter timescales, and their potential impact on sediment records deposited in the...

Production, transport and deposition of aeolian dust from land to sea closely interact with regional environment and global climate. This Special Issue addresses transport of aeolian dust from the Asian inland to the Loess Plateau and North Pacific Ocean and their possible links to oceanic ecosystem, global climate and even human activity, over var...

Changes in terrigenous organic matter (OM) input, productivity and the associated bottom-water redox conditions, together with forcing mechanisms and global carbon cycle implications of such variations, on the western margin of the Western Pacific Warm Pool (WPWP) during the Quaternary remain controversial. In this study, we reconstructed the hydro...

A high-resolution fire history in the Yangtze River Basin over the past 7.0 ka BP is reconstructed based on the proxy of black carbon of sediment core ECMZ on the continental shelf of the East China Sea in order to reveal the interactions among fire, climate, vegetation and human activity on a regional scale. A comparison of fire activity with clim...

Previous studies have proposed that the two-phase structure of Heinrich Stadial 1 (HS1) is a ubiquitous feature. However, few studies have focused on the internal structure of HS1 over a tropical domain; thus, the interhemispheric ocean-atmosphere teleconnections during HS1 are poorly defined. Here, we present high-resolution sedimentological, geoc...

We investigated the microscopic mineral characteristics of modern eolian dust particulates and the trace-element compositions of the siliciclastic fractions of these samples, collected from the Philippine Sea in 2014 and 2015, and conducted an air mass backwards trajectory analysis of dust particulates in the spring and winter of 2015, to better co...

深海氧同位素记录揭示新生代以来全球气候呈整体变冷趋势，南北两极先后发育冰盖，地球由温室气候变为冰室气候，但是其变冷机制仍不明确。大气CO2浓度降低和大洋环流模式改变均被认为与新生代气候变冷密切相关，但目前对两者的作用还未达成统一的认识，由此存在各种假说，如BLAG假说、高原隆升-风化假说、构造隆升-碳埋藏假说、火山铁肥效应和岛弧隆升-风化假说及海道开合假说等，用以解释新生代全球变冷。围绕新生代气候变冷机制方面的争论，评述了过去近几十年来相关研究的进展和存在的问题，讨论了不同机制对新生代气候变化的影响，并提出未来需要加强的研究重点：建立准确的新生代大气CO2浓度演变序列、建立更加准确的地球内部排气和青藏高原隆升及海道开合时刻表、建立完善的风化指标体系、加强火山作用及其大洋生物地球化学效应的研究...

Plain Language Summary The modern East Asian winter monsoon (EAWM) is influenced by the combined effects of both the high‐latitude Northern Hemisphere (e.g., Siberian High) and the low‐latitude Western Pacific (e.g., El Niño–Southern Oscillation) and plays a major role in regulating atmospheric energy of East Asia and even the Northern Hemisphere....

Aeolian dust input exerts significant influence on oceanic biogeochemical cycles and further potentially controls atmospheric CO 2 concentrations. However, the possible link between long-term aeolian dust supply and primary productivity in the western North Pacific remains poorly understood. Here, we present a comprehensive study of major and trace...

We analyzed rare earth elements (REEs) and SrNd isotope compositions of siliciclastic components in a sediment core from the middle Okinawa Trough (OT), to elucidate spatiotemporal variations in the sediment provenance, and their underlying mechanisms for the last 20 ky. Our results show that the trough deposits were characterized by different prop...

Multiproxy records from Core MD06-3054 in the western Philippine Sea and published results from the nearby Core MD06-3052, which are both located at the northern margin of the Western Pacific Warm Pool (WPWP), provide precise reconstructions and evidence for the potential controls on continental erosion and weathering intensities in Luzon. These da...

Spectral analysis of sediment from International Ocean Discovery Program (IODP) Site U1433 in the South China Sea can be used to constrain humidity and temperature through time by constructing hematite/goethite records spanning the last 10 million years. Records in the southwest and northern parts of this basin show long-term contrasting trends, de...

Long marine sequences deposited in the Arabian Sea are suitable to study the orbital sensitivity of sediment dynamics from a source-to-sink perspective. The clay mineralogy and SrNd isotopic compositions have been analyzed for the detrital fraction of sediments from IODP Site U1457 located in the Laxmi basin, eastern Arabian Sea to constrain the se...

Isotopic compositions of coeval sulfide and sulfate have been widely employed to reconstruct the seawater chemistry evolution over geologic time; however, these signals can be modulated by other factors, such as the sedimentation rate. Here, we present a data set of pyrite sulfur isotopes (δ34Spy) derived from 60-m drilled core sediments deposited...

During the Quaternary, global sea level was characterized by large fluctuations in amplitude and increased frequency. However, the eastern marginal seas of China, especially the northern East China Sea and Yellow Sea did not experience large-scale transgression until the middle Pleistocene. The Zhe-Min (Zhejiang-Fujian) Uplift was an important barr...

Continuous and high-resolution records of the content, mass accumulation rate (MAR) and δ13C values of black carbon obtained from Integrated Ocean Drilling Program (IODP) Site U1430 in the southwestern Japan Sea have been established and combined with previous results obtained from Central Asia. The main objective of this work is to reconstruct the...

The two-stage increase in atmospheric carbon dioxide (CO2), and the associated decrease in radiocarbon (¹⁴C) during the last deglaciation, are thought to have been linked to enhanced Southern Ocean upwelling and the rapid release of sequestered ¹⁴C-depleted CO2. Antarctic Intermediate Water (AAIW), originating from the Southern Ocean, reflects vari...

Continental breakup represents the successful process of rifting and thinning of the continental lithosphere, leading to plate rupture and initiation of oceanic crust formation. Magmatism during breakup seems to follow a path of either excessive, transient magmatism (magma-rich margins) or of igneous starvation (magma-poor margins). The latter type...

Gypsum (CaSO4∙2H2O) precipitated in nonevaporative marine environments is rarely reported, and the related diagenetic process and its implications for the sulfur cycle (e.g., sulfide reoxidation) are still not well known. We employ coupled sulfur and oxygen isotopes of authigenic gypsum, as well as sulfur isotopic compositions of pyrite, from core...