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Decadal-centennial hydroclimate variability over eastern China during the last millennium:Results from the product of Paleo Hydrodynamics Data Assimilation

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Atmospheric and Oceanic Science Letters 2021年第3期14卷 25-29页

作者： Youbing Peng Department of Earth Environmental Science Xi’an Jiao Tong UniversityXi’anChina

Decadal–centennial hydroclimate variability over eastern China during the last millennium is investigated using the product of Paleo Hydrodynamics Data Assimilation(PHYDA).Results reveal that the PHYDA depicts a more homogeneous temporal pattern during the early part of the Little Ice Age with other reconstructions than those during the other periods,and could also identify the droughts of 1352–90 AD,1445–98 AD,1580–94 AD,and 1626–65 AD during this *** centennial time scales,the PHYDA shows that the linkage between the Palmer drought severity index over eastern China and the Atlantic Multidecadal Oscillation(AMO)index is more marked than that with the El Niño–Southern Oscillation and the location of the intertropical convergence zone over the Asian–Australian monsoon area during the period after the *** the decadal droughts,the PHYDA suggests most of the drought events during the last millennium were linked to the El Niño–like mean states and the negative AMO states.

关键词： Drought hydroclimate Eastern China Data assimilation The last millennium

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维普期刊数据库

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A 1556 year-long early summer moisture reconstruction for the Hexi Corridor, Northwestern China

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Science China Earth Sciences 2019年第6期62卷 953-963页

作者： Bao YANG Jianglin WANG Jingjing LIU Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

We report a 1556 year-long tree-ring width chronology for the Hexi Corridor, in the arid Northwestern China,established by applying the signal-free regional curve standardization method to 416 juniper ring-width series. We found that drought in early summer(May–June) is the primary controlling factor for tree growth in this area. We then developed an early summer moisture(i.e., scPDSI) reconstruction from 455 CE to present. Our reconstruction captures multi-centennial scale moisture variations, showing two long-term dry periods during 800–950 CE and 1000–1200 CE, and two long-term wet periods during 1200–1450 CE and 1510–1620 CE. We found strong similarities between hydroclimatic changes in the Hexi Corridor and Qaidam Basin from interannual to centennial timescales; however, at multi-centennial(>300 years) timescales, hydroclimatic variations in the two regions showed significant regional differences. The Hexi Corridor witnessed a generally dry Medieval Climate Anomaly(MCA, here 800–1200 CE) and the drying 20 th century, whereas the Qaidam Basin experienced highprecipitation periods during the MCA and 20 th century. The different correlation pattern with Northern Hemisphere temperature suggest that the Qaidam Basin will receive more precipitation under global warming, whereas the Hexi Corridor will become dryer in the future.

关键词： Hexi Corridor Tree-ring index Early-summer hydroclimate reconstruction

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