Hai Cheng
Dados Biográficos
| ID | 3584909 |
|---|---|
| NOME | Hai Cheng |
| PRENOMES | Hai |
| SOBRENOME | Cheng |
| ASSINATURA | CHENG H |
| AFILIAÇÕES | University of Minnesota |
| ORCID | 0000-0002-5305-9458 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 92 |
| TOTAL DE CITAÇÕES | 2498 |
| TOTAL COMO AUTOR | 92 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2000 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 9 |
Earliest centripetal flaking system in eastern Eurasia reveals human behavioral complexity in late Middle Pleistocene China
Cave art resilience
The decorated caves contain the earliest artistic expressions of humankind and represent a major cultural heritage. Their significance has been recognized by UNESCO, which has declared them a World Heritage Site. However, they are extremely fragile environments, exposed to various factors of deterioration that threaten their conservation. To implement appropriate protective measures, it is essential to understand the dynamics of these underground…
Screening speleothem U/Th ages through crystal petrography analysis
Prehistoric human hand and footprints in Quesang on the central Tibetan Plateau from the Bølling-Allerød Interstadial
Tropical vegetation productivity and atmospheric methane over the last 40,000 years from model simulations and stalagmites in Sulawesi, Indonesia
Recent research has shown the potential of speleothem δ 13 C to record a range of environmental processes. Here, we report on 230 Th-dated stalagmite δ 13 C records for southwest Sulawesi, Indonesia, over the last 40,000 yr to investigate the relationship between tropical vegetation productivity and atmospheric methane concentrations. We demonstrate that the Sulawesi stalagmite δ 13 C record is driven by changes in vegetation productivity and soi…
Precisely constrained 134-ka strong monsoon event in the penultimate deglaciation by an annually laminated speleothem from the Asian monsoon domain
The penultimate deglaciation was characterized by a sub-millennial-scale warm event in the Heinrich Stadial 11(HS11), termed the 134-ka event. However, its precise timing and structure remain poorly constrained due to the lack of high-resolution and precisely dated records. We present an oxygen isotope record of a speleothem with well-developed annual lamina from Zhangjia Cave, located on the north margin of the Sichuan Basin, characterizing Asia…
Climate variability in the northern Levant from the highly resolved Qadisha record (Lebanon) during the Holocene optimum
New stalagmites from Qadisha Cave (Lebanon) located at 1720 m above sea level provide a high-resolution and well-dated record for northern Mount Lebanon. The stalagmites grew discontinuously from 9.2 to 5.7 and at 3.5 ka, and they show a tendency to move from a more negative oxygen isotope signal at ~9.1 ka to a more positive signal at ~5.8 ka. Such a trend reflects a change from a wetter to a drier climate at high altitudes. The δ 13 C signal sh…
A regime shift between soil moisture and temperature in the 1950s over the permafrost region of Northeast China
Permafrost is one of the essential carbon pools in the world. Due to limited studies on historical soil moisture changes and the coupling relationship between soil moisture and temperature in permafrost regions, significant uncertainty exists in the carbon loss in permafrost predicted by different models under global warming scenarios. Based on the tree‐ring width chronology of Pinus sylvestris var. mongholica Litv. growing in the southern edge o…
Improving the age constraints on the archeological record in Scladina Cave (Belgium)
The sedimentary sequence in Scladina Cave (Belgium) is well-known for its rich Middle Paleolithic assemblages and its numerous faunal remains. Of particular interest is the presence of a nearly complete mandible of a Neandertal child. To place all these finds in the correct chronostratigraphic context, various dating techniques have been applied over the past decades. This resulted in a reasonably well-constrained age model, roughly spanning the …
Development of the Intcal Database
The IntCal family of radiocarbon ( 14 C) calibration curves is based on research spanning more than three decades. The IntCal group have collated the 14 C and calendar age data (mostly derived from primary publications with other types of data and meta-data) and, since 2010, made them available for other sorts of analysis through an open-access database. This has ensured transparency in terms of the data used in the construction of the ratified c…
El Niño-Southern Oscillation signals imprinted in stalagmite δ18O from 2005 to 2017
Virtual reconstruction of the Palaeolithic landscape in Santimamiñe cave (Bizkaia, Spain)
Santimamiñe Cave, in Biscay (North Spain) is a well-known archaeological site in the region because of its prompt discovery and excavation in the early 20th century and its ensemble of parietal art. The latest studies have identified human occupation in the entrance from the Lower Magdalenian, while the inner passages were presumably decorated in the Middle and Upper phases of the period (about 16.5 to 14.5 ka). One of the particularities of the …
New evidence of prehistoric human activity on the central Tibetan plateau during the early to middle Holocene
The cold and hypoxic environment of the Tibetan Plateau was a major challenge for its prehistoric human occupants. The earliest known hominin occupation (or visitation) of the Tibetan Plateau was at ~200 ka, in the middle Pleistocene, and these hominins must have had survival strategies for this harsh environment. We report the discovery of 5 handprints and 17 footprints on the travertine near the outlet of the Quesang hot spring, a well-document…
Hydroclimatic changes in south-central China during the 4.2 ka event and their potential impacts on the development of Neolithic culture
The 4.2 ka event is widely presumed to be a globally widespread aridity event and has been linked to several episodes of societal changes across the globe. Whether this climate event impacted the cultural development in south-central China remains uncertain due to a lack of regional paleorainfall records. We present here stalagmite stable carbon isotope and trace element–based reconstruction of hydroclimatic conditions from south-central China. O…
Climate and ecology changes during the last deglaciation revealed by stalagmite from Shima Cave, central China
Climatic and anthropogenic influence on vegetation in southeastern China during the past 120 years inferred from speleothem
Spatial variation of precipitation in eastern China over the past 150 years based on speleothem multi-proxy analysis
Garden Offerings in the Kona Field System, Hawai'i Island
Identifying and explaining the end of long-lived practices is a major challenge for anthropological archaeology. We present a high-precision uranium series dating (230Th/U) chronology of an undocumented aspect of Hawaiian religion: the use of corals as offerings in gardens. Our results from the upland gardens of Kealakekua (Kona District, Hawai'i Island) document the onset of religious offerings at the same time as farming in the area at around A…
Oldest Dryas hydroclimate reorganization in the eastern Iberian Peninsula after the iceberg discharges of Heinrich Event 1
This study examines the first precisely dated and temporally highly resolved speleothem record from Iberia that reconstructs the Oldest Dryas (OD). The onset of cold conditions in the study area, contemporary with the beginning of Heinrich Stadial 1, is recorded at 18.13 ± 0.08 ka, with a pronounced drop of 6.1‰ in δ 13 C in 250 years. Henceforth, stadial conditions depict a period of instability in the Atlantic Meridional Overturning Circulation…
Indian summer monsoon variability in northeastern India during the last two millennia
Timing and structure of early-Holocene climate anomalies inferred from north Chinese stalagmite records
In this paper, a new decadal resolution stalagmite δ 18 O record covering 10.4–6.5 ka BP from Kulishu cave in Beijing, north China is presented in combination with the published stalagmite δ 18 O record covering 10.4–14.0 ka BP in the same cave. Five significant monsoon collapses were identified around 11.5, 11.0, 10.0, 9.4, and 8.2 ka BP as well as three smaller ones around 10.3, 9.0, and 8.6 ka BP. The weak monsoon episodes around 8.6 and 8.2 k…
Response to Comments by Daniel Gebregiorgis et al. “A Brief Commentary on the Interpretation of Chinese Speleothem δ18O Records as Summer Monsoon Intensity Tracers”. Quaternary 2020, 3, 7
We would like to thank Gebregiorgis et al [...]
Black carbon traces of human activities in stalagmites from Turkey
Effects of land-use change on the distribution of the wintering red-crowned crane (Grus japonensis) in the coastal area of northern Jiangsu Province, China
The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)
Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14 C concentration. Although calibration curves are constructed from independently dated archives, they invariably require revision as new data become available and our understanding of the Earth syste…
IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP
The IntCal09 and Marine09 radiocarbon calibration curves have been revised utilizing newly available and updated data sets from 14 C measurements on tree rings, plant macrofossils, speleothems, corals, and foraminifera. The calibration curves were derived from the data using the random walk model (RWM) used to generate IntCal09 and Marine09, which has been revised to account for additional uncertainties and error structures. The new curves were r…
The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)
Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14 C concentration. Although calibration curves are constructed from independently dated archives, they invariably require revision as new data become available and our understanding of the Earth syste…
High-precision U-series dating of Locality 1 at Zhoukoudian, China
Emanuel Cave (Israel)
A series of short successive occupations were revealed at the new Middle Paleolithic site of Emanuel Cave. A date of 191± 1 Ka (U/ Th) is suggested as a terminus post quem for the archaeological deposits. Despite the ephemeral nature of the site, the lithic assemblage displays two distinct facies ; the lower layers with a predominantly laminar nature and the upper layers, reflecting more use of the Levallois technology. Techno-typological compari…
A high-resolution stalagmite record of the Holocene East Asian monsoon from Mt Shennongjia, central China
High-resolution oxygen isotope (δ 18 O) profiles of six stalagmites from Sanbao Cave in Hubei province, central China, established with 1413 oxygen isotope data and 65 230 Th ages, provide a continuous history of East Asian Summer Monsoon (EASM) intensity for the period from 13—0.2 thousand years before present (ky BP, relative to AD 1950). The δ 18 O record includes four distinct stages in the evolution of the EASM: (1) an abrupt transition (~11…
Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
We present a new record of radiocarbon ages measured by accelerator mass spectrometry (AMS) on a deep-sea core collected off the Pakistan Margin. The 14 C ages measured on the planktonic foraminifera Globigerinoides ruber from core MD04-2876 define a high and stable sedimentation rate on the order of 50 cm/kyr over the last 50 kyr. The site is distant from the main upwelling zone of the western Arabian Sea where 14 C reservoir age is large and ma…
Sequence of mammalian fossils, including hominoid teeth, from the Bubing Basin caves, South China
Evaluating agricultural bet‐hedging strategies in the Kona Field System
The Kona Field System, located on the leeward side of Hawai‘i Island, is comprised of a network of stone field walls, terraces, mounds and other agricultural, residential and religious features stretched over an estimated 163 km2. Previous research indicates a construction history of the fields that could have begun as early as the Foundation Period (AD 1000–1200), followed by a shift in agricultural strategies from those that reduce variance in …
Mass spectrometric U-series dating of Laibin hominid site in Guangxi, southern China
Centennial- to decadal-scale monsoon precipitation variability in the semi-humid region, northern China during the last 1860 years
We developed a composite oxygen isotopic record of cave calcite for the last 1860 years based on three stalagmites from the Huangye Cave in eastern Gansu Province, northern China. The δ 18 O values reflect monsoon precipitation changes, with lower δ 18 O values representing higher precipitation and vice versa. Three intervals of high precipitation were identified at AD 138—450, AD 730—1200, and AD 1860—1960. Two intervals of low precipitation occ…
New evidence of prehistoric human activity on the central Tibetan plateau during the early to middle Holocene
The cold and hypoxic environment of the Tibetan Plateau was a major challenge for its prehistoric human occupants. The earliest known hominin occupation (or visitation) of the Tibetan Plateau was at ~200 ka, in the middle Pleistocene, and these hominins must have had survival strategies for this harsh environment. We report the discovery of 5 handprints and 17 footprints on the travertine near the outlet of the Quesang hot spring, a well-document…
Precipitation evolution of Central Asia during the last 5000 years
Central Asia is located at the confluence of large-scale atmospheric circulation systems. However, the number of Holocene climate records is still low in most parts of this region and insufficient to allow detailed discussion and comparisons to disentangle the complex climate history and interplays between the different climatic systems. Here, we present the first stalagmite record from arid Central Asia (south-western Kyrgyzstan) by using δ 18 O…
Mass spectrometric U-series dating of New Cave at Zhoukoudian, China
Virtual reconstruction of the Palaeolithic landscape in Santimamiñe cave (Bizkaia, Spain)
Santimamiñe Cave, in Biscay (North Spain) is a well-known archaeological site in the region because of its prompt discovery and excavation in the early 20th century and its ensemble of parietal art. The latest studies have identified human occupation in the entrance from the Lower Magdalenian, while the inner passages were presumably decorated in the Middle and Upper phases of the period (about 16.5 to 14.5 ka). One of the particularities of the …
Radiocarbon Dating of Deep-Sea Corals
Deep-sea corals are a promising new archive of paleoclimate. Coupled radiocarbon and U-series dates allow 14 C to be used as a tracer of ocean circulation rate in the same manner as it is used in the modern ocean. Diagenetic alteration of coral skeletons on the seafloor requires a thorough cleaning of contaminating phases of carbon. In addition, 10% of the coral must be chemically leached prior to dissolution to remove adsorbed modern CO 2 . A su…
Black carbon traces of human activities in stalagmites from Turkey
The 7.2 ka climate event
Speleothem records have radically changed our understanding of the paleo Asian monsoon (AM), but explanations for Asian summer monsoon (ASM) variations in the Holocene period are usually based on single proxy records, such as oxygen isotope (δ 18 O). The application of multi-proxy records to the study of the forcing mechanism and internal structure of climate events is more comprehensive and accurate in the analysis of paleoclimates than using si…
Timing and duration of the East Asian summer monsoon maximum during the Holocene based on stalagmite data from North China
We present a continuous C-O isotope series that shows the detailed variability of East Asian summer monsoon (EASM) since 11.0 ka BP. The series is based on two stalagmites, namely, DSY1 and LM2, which were, respectively, obtained from Dongshiya and Laomu caves. The δ 18 O profiles of stalagmite excurse negatively in early Holocene and gradually become positive after around 6.9 ka BP, tracking the change in Northern Hemisphere summer insolation. M…
Geochronology, sediment provenance, and fossil emplacement at Sumidouro Cave, a classic late Pleistocene/early Holocene Paleoanthropological site in eastern Brazil
Peter Wilhelm Lund's (1845a) heavily debated suggestion of a contemporaneity between Paleo‐Indians and extinct Pleistocene fauna at Sumidouro Cave was re‐examined through detailed sedimentological and geochronological analyses of sediment and both human and faunal remains. Sources of the cave's sediment include both entrances as well as ceiling fissures. Non‐human fossils, on the other hand, were probably carried by floodwater through the once mo…
A 6000-year high-resolution climatic record from a stalagmite in Xiangshui Cave, Guilin, China
Middle-to late-Holocene palaeoclimate change has been reconstructed at high resolution by the analysis of the carbon and oxygen isotopes from a thermal ionization mass spectrometric (TIMS) U/Th dated stalagmite from Xiangshui Cave, near Guilin, Guangxi Province, China. The carbon and oxygen isotopic records from the stalagmite suggest that changes in the Asian monsoon since the middle Holocene (6000 BP) can be divided into two periods: (1) an int…
Integrating U-Th, 14 C, and 210 Pb methods to produce a chronologically reliable isotope record for the Belize River Valley Maya from a low-uranium stalagmite
Social and environmental changes had great spatiotemporal variability in the Maya Lowlands during the Classic and Postclassic Periods, and stalagmites promise high-resolution paleoclimate data that can refine our understanding of this complex time. Unfortunately, stalagmites in this region are often difficult to date by U-Th methods because of low initial uranium concentrations. Other dating techniques can be used on such stalagmites, and we pres…
Multiproxy evidence from caves of Native Americans altering the overlying landscape during the late Holocene of east-central North America
We compare environmental changes recorded in stalagmites and alluvium from the mountainous Buckeye Creek basin of West Virginia, USA to a nearby, independent archaeological record of Native American presences in the forested watershed. A climatic record constructed from stable isotopic (δ 18 O calc and δ 13 C calc ) and trace metal (Sr/Ca) ratios in stalagmitic calcite is consistent with regional palynology during much of the Holocene. The stalag…
Development of the Intcal Database
The IntCal family of radiocarbon ( 14 C) calibration curves is based on research spanning more than three decades. The IntCal group have collated the 14 C and calendar age data (mostly derived from primary publications with other types of data and meta-data) and, since 2010, made them available for other sorts of analysis through an open-access database. This has ensured transparency in terms of the data used in the construction of the ratified c…
Garden Offerings in the Kona Field System, Hawai'i Island
Identifying and explaining the end of long-lived practices is a major challenge for anthropological archaeology. We present a high-precision uranium series dating (230Th/U) chronology of an undocumented aspect of Hawaiian religion: the use of corals as offerings in gardens. Our results from the upland gardens of Kealakekua (Kona District, Hawai'i Island) document the onset of religious offerings at the same time as farming in the area at around A…
Stalagmite multi-proxy evidence of wet and dry intervals in northeastern Namibia
Multiple proxies using variation in δ 18 O, δ 13 C, mineralogy, and petrography in a newly generated high-resolution record of Stalagmite DP1 from Dante Cave indicate a linkage between changes in hydroclimate in northeastern Namibia and changes in solar activity and changes in global temperatures. The record suggests that during solar minima and globally cooler conditions (ca. 1660–1710 and ca. 1790–1830), wetter periods (reflecting longer summer…
The half-lives of uranium-234 and thorium-230
A High-Resolution Absolute-Dated Late Pleistocene Monsoon Record from Hulu Cave, China
Oxygen isotope records of five stalagmites from Hulu Cave near Nanjing bear a remarkable resemblance to oxygen isotope records from Greenland ice cores, suggesting that East Asian Monsoon intensity changed in concert with Greenland temperature between 11,000 and 75,000 years before the present (yr. B.P.). Between 11,000 and 30,000 yr. B.P., the timing of changes in the monsoon, as established with 230 Th dates, generally agrees with the timing of…
High-precision U-series dating of Locality 1 at Zhoukoudian, China
Radiocarbon Dating of Deep-Sea Corals
Deep-sea corals are a promising new archive of paleoclimate. Coupled radiocarbon and U-series dates allow 14 C to be used as a tracer of ocean circulation rate in the same manner as it is used in the modern ocean. Diagenetic alteration of coral skeletons on the seafloor requires a thorough cleaning of contaminating phases of carbon. In addition, 10% of the coral must be chemically leached prior to dissolution to remove adsorbed modern CO 2 . A su…
El Niño/Southern Oscillation and tropical Pacific climate during the last millennium
Mass spectrometric U-series dating of New Cave at Zhoukoudian, China
Timing, Duration, and Transitions of the Last Interglacial Asian Monsoon
Thorium-230 ages and oxygen isotope ratios of stalagmites from Dongge Cave, China, characterize the Asian Monsoon and low-latitude precipitation over the past 160,000 years. Numerous abrupt changes in 18 O/ 16 O values result from changes in tropical and subtropical precipitation driven by insolation and millennial-scale circulation shifts. The Last Interglacial Monsoon lasted 9.7 ± 1.1 thousand years, beginning with an abrupt (less than 200 year…
Uranium-series coral ages from the US Atlantic Coastal Plain–the “80ka problem” revisited
A 6000-year high-resolution climatic record from a stalagmite in Xiangshui Cave, Guilin, China
Middle-to late-Holocene palaeoclimate change has been reconstructed at high resolution by the analysis of the carbon and oxygen isotopes from a thermal ionization mass spectrometric (TIMS) U/Th dated stalagmite from Xiangshui Cave, near Guilin, Guangxi Province, China. The carbon and oxygen isotopic records from the stalagmite suggest that changes in the Asian monsoon since the middle Holocene (6000 BP) can be divided into two periods: (1) an int…
A Speleothem Record of Younger Dryas Cooling, Klamath Mountains, Oregon, USA
A well-dated δ 18 O record in a stalagmite from a cave in the Klamath Mountains, Oregon, with a sampling interval of 50 yr, indicates that the climate of this region cooled essentially synchronously with Younger Dryas climate change elsewhere in the Northern Hemisphere. The δ 18 O record also indicates significant century-scale temperature variability during the early Holocene. The δ 13 C record suggests increasing biomass over the cave through t…
A high-resolution, absolute-dated Holocene and deglacial Asian monsoon record from Dongge Cave, China
The Holocene Asian Monsoon
A 5-year-resolution absolute-dated oxygen isotope record from Dongge Cave, southern China, provides a continuous history of the Asian monsoon over the past 9000 years. Although the record broadly follows summer insolation, it is punctuated by eight weak monsoon events lasting ∼1 to 5 centuries. One correlates with the “8200-year” event, another with the collapse of the Chinese Neolithic culture, and most with North Atlantic ice-rafting events. Cr…
Geochronology, sediment provenance, and fossil emplacement at Sumidouro Cave, a classic late Pleistocene/early Holocene Paleoanthropological site in eastern Brazil
Peter Wilhelm Lund's (1845a) heavily debated suggestion of a contemporaneity between Paleo‐Indians and extinct Pleistocene fauna at Sumidouro Cave was re‐examined through detailed sedimentological and geochronological analyses of sediment and both human and faunal remains. Sources of the cave's sediment include both entrances as well as ceiling fissures. Non‐human fossils, on the other hand, were probably carried by floodwater through the once mo…
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project
A 136-m-long drill core of sediments was recovered from tropical high-altitude Lake Titicaca, Bolivia-Peru, enabling a reconstruction of past climate that spans four cycles of regional glacial advance and retreat and that is estimated to extend continuously over the last 370,000 yr. Within the errors of the age model, the periods of regional glacial advance and retreat are concordant respectively with global glacial and interglacial stages. Perio…
A 900‐year (600 to 1500 A.D.) record of the Indian summer monsoon precipitation from the core monsoon zone of India
We present a near‐annually resolved record of the Indian summer monsoon (ISM) rainfall variations for the core monsoon region of India that spans from 600 to 1500 A.D. from a 230 Th‐dated stalagmite oxygen isotope record from Dandak Cave. Our rainfall reconstruction, which spans the Medieval Warm Period (MWP) and the earliest portion of the Little Ice Age (LIA), indicates that the short instrumental record of ISM underestimates the magnitude of m…
Mass spectrometric U-series dating of Laibin hominid site in Guangxi, southern China
Sequence of mammalian fossils, including hominoid teeth, from the Bubing Basin caves, South China
Paleoclimate reconstruction in the Levant region from the geochemistry of a Holocene stalagmite from the Jeita cave, Lebanon
Dated oxygen and carbon isotopic profiles from a Holocene stalagmite (11.9–1.1 ka) from the Jeita cave, Lebanon, are compared to variations in crystallographic habit, stalagmite diameter and growth rate. The profiles show generally high δ 18 O and δ 13 C values during the late-glacial period, low values during the early Holocene, and again high values after 5.8 ka. On the basis of the good correlation between the morphological and crystallographi…
A Test of Climate, Sun, and Culture Relationships from an 1810-Year Chinese Cave Record
A record from Wanxiang Cave, China, characterizes Asian Monsoon (AM) history over the past 1810 years. The summer monsoon correlates with solar variability, Northern Hemisphere and Chinese temperature, Alpine glacial retreat, and Chinese cultural changes. It was generally strong during Europe's Medieval Warm Period and weak during Europe's Little Ice Age, as well as during the final decades of the Tang, Yuan, and Ming Dynasties, all times that we…
Millennial- and orbital-scale changes in the East Asian monsoon over the past 224,000 years
Α high-resolution late Holocene speleothem record from Kaite Cave, northern Spain
Timing and climatic impact of Greenland interstadials recorded in stalagmites from northern Turkey
A 50 kyr‐long exceptionally well‐dated and highly resolved stalagmite oxygen ( δ 18 O) and carbon ( δ 13 C) isotope record from Sofular Cave in northwestern Turkey helps to further improve the dating of Greenland Interstadials (GI) 1, and 3–12. Timing of most GI in the Sofular record is consistent within ±10 to 300 years with the “iconic” Hulu Cave record. Larger divergences (>500 years) between Sofular and Hulu are only observed for GI 4 and 7. …
Multiproxy evidence from caves of Native Americans altering the overlying landscape during the late Holocene of east-central North America
We compare environmental changes recorded in stalagmites and alluvium from the mountainous Buckeye Creek basin of West Virginia, USA to a nearby, independent archaeological record of Native American presences in the forested watershed. A climatic record constructed from stable isotopic (δ 18 O calc and δ 13 C calc ) and trace metal (Sr/Ca) ratios in stalagmitic calcite is consistent with regional palynology during much of the Holocene. The stalag…
Textural and carbon isotopic evidence of monsoonal changes recorded in a composite-type speleothem from Korea since MIS 5a
Textural and stable isotopic records of a composite-type speleothem from Gwaneum Cave in the eastern part of the Korean peninsula show prominent paleoenvironmental changes since MIS (marine oxygen isotope stage) 5a. Based on 230 Th/ 234 U dating, the speleothem experienced growth from 90.9 ± 6.5 ka to 1.2 ± 0.5 ka with several hiatuses. Four growth phases (A, B, C and D) are recognized based on speleothem type and texture. Very irregular and late…
The East Asian Monsoon During MIS 2 Expressed in a Speleothem δ 18 O Record From Jintanwan Cave, Hunan, China
Stalagmite J1 from Jintanwan Cave, Hunan, China, provides a precisely dated, decadally resolved δ 18 O proxy record of paleoclimatic changes associated with the East Asian monsoon from ∽29.5 to 14.7 ka and from ∽12.9 to 11.0 ka. At the time of the last glacial maximum (LGM), the East Asian summer monsoon weakened and then strengthened in response to changes in Northern Hemisphere insolation. As the ice sheets retreated the East Asian summer monso…
Geography (79 obras) · Geology and Paleoclimatology Research (75 obras) · Climatology (57 obras) · Archaeology (54 obras) · Cave (54 obras) · Stalagmite (54 obras) · Holocene (53 obras) · Geology (45 obras) · Geology (45 obras) · Physical geography (44 obras)