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学者姓名：程海
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Abstract ：
In recent years, many researchers have studied spatial variation of summer monsoon precipitation pattern in eastern China during the last 50 years by using instrumental data. However, precisely dated high-resolution reconstructed records spanning over more than a hundred years are still sparse. Here, we present a seasonally-resolved speleothem multi-proxy (Mg/Ca, delta O-18(c) and delta C-13) record spanning 1824-2009 CE from E'mei cave, Jiangxi Province, Southeast China. For the last 180 years, the delta C-13 record shows similar variation to the Mg/Ca record, and both are consistent with local precipitation, but delta O-18(c) record shows a unique variation different from delta C-13 and Mg/Ca records. We suggest that both delta C-13 and Mg/Ca can reflect changes in local precipitation while delta O-18(c) is mainly influenced by large-scale monsoon circulation on the long-term trend. Comparison of the Mg/Ca record between E'mei and Shihua caves indicates that the variation of summer monsoon precipitation in the lower reaches of the Yangtze River is opposite to that in northern China during the last ~150 years, consistent with the pattern of the "northern drought and southern flood " in eastern China observed in instrumental data.
Keyword ：
Eastern China "Northern drought and southern flood" Precipitation pattern Speleothem Trace element
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| GB/T 7714 | Niu, Xiaowen , Zhang, Haiwei , Li, Hanying et al. Spatial variation of precipitation in eastern China over the past 150 years based on speleothem multi-proxy analysis [J]. | QUATERNARY INTERNATIONAL , 2022 , 622 : 89-96 . |
| MLA | Niu, Xiaowen et al. "Spatial variation of precipitation in eastern China over the past 150 years based on speleothem multi-proxy analysis" . | QUATERNARY INTERNATIONAL 622 (2022) : 89-96 . |
| APA | Niu, Xiaowen , Zhang, Haiwei , Li, Hanying , Wang, Jian , Bao, Yanyan , Cheng, Hai . Spatial variation of precipitation in eastern China over the past 150 years based on speleothem multi-proxy analysis . | QUATERNARY INTERNATIONAL , 2022 , 622 , 89-96 . |
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Abstract ：
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 resolution of 0.8 years and mean age uncertainty less than 4 years from Shijiangjun Cave, Southwest China (SW China). We have characterized the dynamics of the Asian summer monsoon (ASM) on interdecadal to centennial timescales during the LIA at unprecedented accuracy and precision. The onset of the LIA occurred at about 1300 (A.D.) and six weak-ASM events were identified at 1340-1380, 1445-1480, 1520-1540, 1600-1630, 1650-1670, and 1695-1730 (A.D.), respectively. The overall climate variability in Chinese monsoon regions is inconsistent with that in Northwest China (NW China). During the coldest period of the LIA (i.e. after 1500 CE), SW China exhibited a cold and dry pattern, while NW China experienced a cold and wet climate. Moreover, our records from the Asian-Australian monsoon (AAM) region showed coherent changes during the LIA, arguing against the interhemispheric "see-saw" model on interdecadal-centennial timescales. Documented solar minima, lower Northern Hemisphere temperature, and positive phases of PDO and ENSO during the LIA weakened the Asian-Australian summer monsoon, decreasing precipitation throughout the AAM regions.
Keyword ：
Atmospheric circulations Ocean circulation "See-saw" model Solar radiation Summer monsoon
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| GB/T 7714 | Li, Ting-Yong , Xiao, Si-Ya , Shen, Chuan-Chou et al. Little Ice Age climate changes in Southwest China from a stalagmite delta O-18 record [J]. | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2021 , 562 . |
| MLA | Li, Ting-Yong et al. "Little Ice Age climate changes in Southwest China from a stalagmite delta O-18 record" . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 562 (2021) . |
| APA | Li, Ting-Yong , Xiao, Si-Ya , Shen, Chuan-Chou , Zhang, Jian , Chen, Chao-Jun , Cheng, Hai et al. Little Ice Age climate changes in Southwest China from a stalagmite delta O-18 record . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2021 , 562 . |
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Abstract ：
Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China. Copyright © 2021 The Authors, some rights reserved.
Keyword ：
Atmospheric thermodynamics Isotopes Oxygen Rain
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| GB/T 7714 | He, C , Liu, Z , Otto-Bliesner, B.L et al. Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation [J]. | Science Advances , 2021 , 7 (4) . |
| MLA | He, C et al. "Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation" . | Science Advances 7 . 4 (2021) . |
| APA | He, C , Liu, Z , Otto-Bliesner, B.L , Brady, E.C , Zhu, C , Tomas, R et al. Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation . | Science Advances , 2021 , 7 (4) . |
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Abstract ：
The culmination of the glaciers in the European Alps during the Last Glacial Maximum (LGM) is one of the most intensively studied paleoglaciological events, but its trigger and forcing remain incompletely understood. Here, we provide evidence that the timing of this glacier maximum coincided within age uncertainties with a 3100 yr-long interval of subsurface warming (26.6 to 23.5 ka BP) as recorded by an archive preserved in caves, cryogenic carbonates. This interval of sustained permafrost degradation during one of the coldest intervals of the last glacial period calls for a fundamental change in the dry Arctic-style precipitation regime. Instead, heavy snowfall during autumn and early winter led to the accumulation of a seasonal snowpack insulating the ground from the winter chill. Combined with thermal modelling, the data provide compelling evidence that the LGM glacier advance in the Alps was fueled by intensive snowfall late in the year, likely sourced from the Mediterranean Sea. What controlled changes of glaciers in the European Alps at the time of their largest extent, about 25,000 years ago, is not well known. Here, the authors use cryogenic carbonates in caves to show that heavy snowfall during autumn and early winter was the main source of glacier growth.
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| GB/T 7714 | Spoetl, C. , Koltai, G. , Jarosch, A. H. et al. Increased autumn and winter precipitation during the Last Glacial Maximum in the European Alps [J]. | NATURE COMMUNICATIONS , 2021 , 12 (1) . |
| MLA | Spoetl, C. et al. "Increased autumn and winter precipitation during the Last Glacial Maximum in the European Alps" . | NATURE COMMUNICATIONS 12 . 1 (2021) . |
| APA | Spoetl, C. , Koltai, G. , Jarosch, A. H. , Cheng, H. . Increased autumn and winter precipitation during the Last Glacial Maximum in the European Alps . | NATURE COMMUNICATIONS , 2021 , 12 (1) . |
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Abstract ：
The tropics experienced a unique monsoon climate that drove important changes in socio-economic conditions and shaped different phases of human history during the late Quaternary across the Indian subcontinent. This study presents a new high-resolution speleothem-record of Indian summer monsoon (ISM) variability ranging from similar to 45,000 to 34,000 yr BP combined with a published record up to 5500 yr BP from the Mawmluh cave, northeastern India. We document significant changes in solar insolation and precession harmonics, implicating solar activity as one of the major forcing factors for rapid monsoonal shifts. Our new delta O-18 time series shows high-amplitude shifts in the ISM during the marine isotope stage 3 (MIS 3), similar to Dansgaard-Oeschger (D-O) oscillations recorded at high northern latitudes, which mimic the Greenland ice sheet record. The sun driven Northern Hemisphere high latitude climate anomalies played an active role in driving ISM variability and changes in the regional hydrological cycle on centennial to millennial time scales across the Indian subcontinent.
Keyword ：
Dansgaard-Oeschger cycles Henrich events Indian summer monsoon Inter tropical convergence zone Precession harmonics Solar insolation
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| GB/T 7714 | Jaglan, Sonu , Gupta, Anil K. , Clemens, Steven C. et al. Abrupt Indian summer monsoon shifts aligned with Heinrich events and D-O cycles since MIS 3 [J]. | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2021 , 583 . |
| MLA | Jaglan, Sonu et al. "Abrupt Indian summer monsoon shifts aligned with Heinrich events and D-O cycles since MIS 3" . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 583 (2021) . |
| APA | Jaglan, Sonu , Gupta, Anil K. , Clemens, Steven C. , Dutt, Som , Cheng, Hai , Singh, Raj K. . Abrupt Indian summer monsoon shifts aligned with Heinrich events and D-O cycles since MIS 3 . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2021 , 583 . |
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Abstract ：
The five interglacials before the Mid-Brunhes Event (MBE) [c.430 thousand years (ka) ago] are generally considered to be globally cooler than those post-MBE. Inhomogeneities exist regionally, however, which suggest that the Arctic was warmer than present during Marine Isotope Stage (MIS) 15a. Using the first speleothem record for the High Arctic, we investigate the climatic response of northeast Greenland between c.588 and c.549 ka ago. Our results indicate an enhanced warmth of at least +3.5 degrees C relative to the present, leading to permafrost thaw and increased precipitation. We find that delta O-18 of precipitation was at least 3 parts per thousand higher than today and recognize two local cooling events (c.571 and c.594 ka ago) thought to be caused by freshwater forcing. Our results are important for improving understanding of the regional climatic response leading up to the MBE and specifically provide insights into the climatic response of a warmer Arctic.
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| GB/T 7714 | Moseley, G. E. , Edwards, R. L. , Lord, N. S. et al. Speleothem record of mild and wet mid-Pleistocene climate in northeast Greenland [J]. | SCIENCE ADVANCES , 2021 , 7 (13) . |
| MLA | Moseley, G. E. et al. "Speleothem record of mild and wet mid-Pleistocene climate in northeast Greenland" . | SCIENCE ADVANCES 7 . 13 (2021) . |
| APA | Moseley, G. E. , Edwards, R. L. , Lord, N. S. , Spotl, C. , Cheng, H. . Speleothem record of mild and wet mid-Pleistocene climate in northeast Greenland . | SCIENCE ADVANCES , 2021 , 7 (13) . |
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Abstract ：
Reliable dating is essential in order to put palaeoclimatological, palaeoenvironmental and archeological information from continental carbonates in the correct time frame. This study evaluates U/Th dating of travertines based on two case studies, i.e., in the Ballik (Denizli, SW Turkey) and Sutto (N Hungary) areas. Previous petrographic, mineralogical and elemental characterization of the travertines enabled sampling of, purely calcitic, micrite or spar dominant, zones that are non-, or solely weak, cathodoluminescent. Despite adapted sampling and detrital thorium corrections, U/Th ages of the Ballik and the Sato travertines are inconsistent with their stratigraphic position. Based on the observation of wavy extinction affecting micritic fabrics and ghost structures, the studied travertines behaved as an open system for uranium after deposition through recrystallisation. Their U/Th ages, consequently, can only be considered as minimum ages. The Ballik travertines precipitated earlier than 0.55-1.31 Ma ago, when late-stage cementation along fractures and in cavities took place, and form the oldest travertines deposited in the Denizli basin. The formation of the Sato travertine area started at the earliest around 2.5 Ma with precipitation of the Cukor travertine. With some short interruptions, active travertine formation in the area took place maximally until 120 ka. The decreasing ages of the Sutto travertines towards the Danube, prove the complex nature of travertines both during deposition as well as during diagenesis, which leads to anomalies with regard to the law of superposition. The diagenetic susceptibility of continental carbonate deposits poses problems in terms of accurate and precise dating. U/Th dating of the intrinsically heterogeneous fabrics of travertines and tufa, as presently applied, should be ceased. Travertines and tufa up to similar to 100 ka might be the exception due to the limited extent of recrystallisation. Sparite cements and veins can be dated more accurately but, even with multiple samples from the same study site and inclusion of coeval samples, give only minimum ages for the whole deposits. To better constrain the time frame of the whole bodies, results from independent dating methods and from the surrounding deposits are necessary. In addition, it is important to keep in mind that the open-system behavior of continental carbonates has implications for diagenetic, palaeoenvironmental and palaeoclimatological studies based on geochemical proxies.
Keyword ：
diagenesis open system recrystallisation travertine U/Th dating
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| GB/T 7714 | Claes, Hannes , Torok, Agnes , Soete, Jeroen et al. U/TH DATING AND OPEN SYSTEM BEHAVIOR: IMPLICATIONS FOR TRAVERTINES BASED ON THE STUDY OF SUTTO (HUNGARY) AND BALLIK (TURKEY) SITES [J]. | QUATERNAIRE , 2020 , 31 (2) : 117-132 . |
| MLA | Claes, Hannes et al. "U/TH DATING AND OPEN SYSTEM BEHAVIOR: IMPLICATIONS FOR TRAVERTINES BASED ON THE STUDY OF SUTTO (HUNGARY) AND BALLIK (TURKEY) SITES" . | QUATERNAIRE 31 . 2 (2020) : 117-132 . |
| APA | Claes, Hannes , Torok, Agnes , Soete, Jeroen , Mohammadi, Zahra , Vassilieva, Elvira , Hamaekers, Helen et al. U/TH DATING AND OPEN SYSTEM BEHAVIOR: IMPLICATIONS FOR TRAVERTINES BASED ON THE STUDY OF SUTTO (HUNGARY) AND BALLIK (TURKEY) SITES . | QUATERNAIRE , 2020 , 31 (2) , 117-132 . |
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Abstract ：
In an eastern-Pacific coral assemblage at Devil's Crown, Galapagos Islands, Ecuador, two coral species, Psammocora stellata and Cycloseris (Diaseris) distorta, form dense populations of unattached colonies on sand and rubble substrata. In the Galapagos, living C. (D.) distorta is found only at this single site, whereas populations of P. stellata are found throughout the Archipelago. Six cores dating to similar to 7700 yBP showed P. stellata to be dominant throughout the history of this isolated community, but C. (D.) distorta increased in abundance from similar to 2200 yBP and reached peak abundance between 1471 yBP and the present. The relative frequency of the two coral species may be linked to millennial-scale climatic variability, and this site may represent a refuge for C. (D.) distorta from unfavorable climatic fluctuations on millennial timescales. Our results demonstrate that some corals can persist in isolated populations for millennia.
Keyword ：
Cycloseris (Diaseris) distorta Eastern tropical Pacific El Nino-Southern Oscillation ENSO Galapagos Paleoecology Psammocora stellata Sediment core
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| GB/T 7714 | Feingold, J. S. , Riegl, B. , Hendrickson, K. et al. 7700-year persistence of an isolated, free-living coral assemblage in the Galapagos Islands: a model for coral refugia? [J]. | CORAL REEFS , 2020 , 39 (3) : 639-647 . |
| MLA | Feingold, J. S. et al. "7700-year persistence of an isolated, free-living coral assemblage in the Galapagos Islands: a model for coral refugia?" . | CORAL REEFS 39 . 3 (2020) : 639-647 . |
| APA | Feingold, J. S. , Riegl, B. , Hendrickson, K. , Toth, L. T. , Cheng, H. , Edwards, R. L. et al. 7700-year persistence of an isolated, free-living coral assemblage in the Galapagos Islands: a model for coral refugia? . | CORAL REEFS , 2020 , 39 (3) , 639-647 . |
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Abstract ：
While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (delta O-18) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem delta O-18 records from three locations along the trajectory of the Indian summer monsoon (ISM), a major branch of the AM, and characterize AM rainfall over the past 180,000 years. We have found that the records close to the monsoon moisture source show large glacial-interglacial variability, which then decreases landward. These changes likely reflect a stronger oxygen isotope fractionation associated with progressive rainout of AM moisture during glacial periods, possibly due to a larger temperature gradient and suppressed plant transpiration. We term this effect, which counteracts the forcing of glacial boundary conditions, the moisture transport pathway effect.
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| GB/T 7714 | Liu, G. , Li, X. , Chiang, H-W et al. On the glacial-interglacial variability of the Asian monsoon in speleothem delta O-18 records [J]. | SCIENCE ADVANCES , 2020 , 6 (7) . |
| MLA | Liu, G. et al. "On the glacial-interglacial variability of the Asian monsoon in speleothem delta O-18 records" . | SCIENCE ADVANCES 6 . 7 (2020) . |
| APA | Liu, G. , Li, X. , Chiang, H-W , Cheng, H. , Yuan, S. , Chawchai, S. et al. On the glacial-interglacial variability of the Asian monsoon in speleothem delta O-18 records . | SCIENCE ADVANCES , 2020 , 6 (7) . |
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Abstract ：
Our knowledge about climatic changes at centennial-scale and their causes during the Holocene climatic optimum (HCO) remains poorly constrained. Here, we present delta O-13 and delta C-13 records from a precisely dated stalagmite (13.2 to 1.9 kyr BP) from Xiniu Cave, central China. The delta O-13 record shows a gradual weakening in the strength of the East Asian summer monsoon (EASM) from early to middle Holocene, corresponding with a decrease in Northern Hemisphere summer insolation (NHSI). A similar pattern is absent in our delta C-13 record, and is replaced by persistent centennial-scale oscillations throughout the Holocene. Variations of delta C-13 reflect changes in vegetation density, soil CO2 production, CO2 degassing, prior calcite precipitation (PCP), and cave ventilation, associated with temperature and rainfall variations at local scale. Based on the delta C-13 record, three dry/cold events at approximately 6.0, 8.2, and 10.5 kyr BP, can be identified during the HCO (11.1 +/- 0.1 to 5.4 +/- 0.1 kyr BP), coinciding with the well-known Holocene Bond events. The power spectrum analysis shows that the significant periodicity (843 yr) of the delta C-13 record within the HCO may be related to the North Atlantic-cycle. Therefore, we speculate that the centennial-scale climatic changes during the HCO probably resulted from cooling in the North Atlantic, and that the intensified and southward Westerly jet played a role in transmitting this signal from high latitudes to central China.
Keyword ：
EASM Hydrothermal North Atlantic Stable isotopes Stalagmite Xiniu Cave
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| GB/T 7714 | Zhang, Jingwei , Kong, Xinggong , Zhao, Kan et al. Centennial-scale climatic changes in Central China during the Holocene climatic optimum [J]. | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2020 , 558 . |
| MLA | Zhang, Jingwei et al. "Centennial-scale climatic changes in Central China during the Holocene climatic optimum" . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 558 (2020) . |
| APA | Zhang, Jingwei , Kong, Xinggong , Zhao, Kan , Wang, Yongjin , Liu, Shushuang , Wang, Zhenjun et al. Centennial-scale climatic changes in Central China during the Holocene climatic optimum . | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY , 2020 , 558 . |
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