Similarities and differences in driving factors of precipitation changes on the western Loess Plateau and the northeaste
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Similarities and differences in driving factors of precipitation changes on the western Loess Plateau and the northeastern Tibetan Plateau at different timescales Changfeng Sun1,2 · Yu Liu1,2,3 · Qiufang Cai1,2 · Qiang Li1,2 · Huiming Song1,2 · Congxi Fang1 · Ruoshi Liu3 Received: 19 February 2020 / Accepted: 18 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Climate change constitutes the superposition of climatic variations at different timescales and is affected by driving factors at multiple scales. Therefore, clarifying the changes in and driving factors of the climate at different timescales is crucial for climate predictions. Here, using the ensemble empirical mode decomposition method, we obtained four components of the western Loess Plateau (WLP) precipitation at the interannual, interdecadal, multidecadal and centennial scales and the long-term change trend, which accounted for 40.4, 33.5, 11.5, 11.6 and 3.0%, respectively, of the total variance in the treering-based precipitation reconstruction during 1566–2013 AD. El Niño-Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Variability (AMV) mainly affected the interannual-decadal, multidecadal and centennial changes, respectively, before increasing anthropogenic aerosol emissions began influencing the WLP precipitation. Using the same method, we also obtained four components of the precipitation on the northeastern Tibetan Plateau (NETP) at different timescales and found that the interannual-decadal and multidecadal changes in the precipitation on the NETP exhibited good relationships with the changes in the WLP precipitation over the past four centuries and were also mainly affected by ENSO and the PDO, respectively. The correlation between the WLP and NETP precipitation at the centennial scale was mainly positive, and the precipitation relationship between these two regions was affected by solar radiation and the AMV to some extent. However, due to the effects of global warming on NETP precipitation and the effects of increasing anthropogenic aerosols on WLP precipitation, this correlation has become negative in recent decades, indicating that without the influences of human activities, the precipitation on the WLP would be positively related to the NETP precipitation. Keywords Tree ring · Precipitation change · Ensemble empirical mode decomposition · Loess plateau · Tibetan plateau · Human activities
1 Introduction
* Changfeng Sun [email protected] * Yu Liu [email protected] 1
The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
2
CAS Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi’an 710061, China
3
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
The ecological environment on the fringe of the Asian summer monsoon, which is located parallel to the 200‐ to 400‐mm rainfa
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