The impact of proxy selection strategies on a millennium-long ensemble of hydroclimatic records in Monsoon Asia

QUATERNARY SCIENCE REVIEWS

卷:223

Article

Schneider, Lea¹  Ljungqvist, Fredrik Charpentier^2,3,4  Yang, Bao⁵  Chen, Fahu^6,7,8  Chen, Jianhui⁸  Li, Jianyong^9,10  Hao, Zhixin¹¹  Ge, Quansheng¹¹  Talento, Stefanie¹  Osborn, Timothy J.¹²  Luterbacher, Juerg^1,13 

[1] Justus Liebig Univ Giessen, Dept Geog Climatol Climate Dynam & Climate Change, Giessen, Germany

[2] Stockholm Univ, Dept Hist, Stockholm, Sweden

[3] Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden

[4] Swedish Coll Adv Study, Uppsala, Sweden

[5] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China

[6] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China

[7] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Beijing, Peoples R China

[8] Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China

[9] Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian 710127, Shaanxi, Peoples R China

[10] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China

[11] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China

[12] Univ East Anglia, Climat Res Unit Sch Environm Sci, Norwich, Norfolk, England

[13] Justus Liebig Univ Giessen, Ctr Int Dev & Environm Res, Giessen, Germany

关键词: Holocene;    Paleoclimatology;    Eastern Asia;    Data treatment;    Large-scale reconstruction;    Low resolution;    Expert assessment;    Spatial decorrelation length;    Multi-proxy;    Past millennium;   

DOI  :  10.1016/j.quascirev.2019.105917

来源: Elsevier

【 摘 要 】

Large-scale palaeoclimate reconstructions can be very sensitive to the proxy records they are based on, and hence to the criteria used to select proxy records. Data selection rarely follows objective criteria that are applicable to all types of proxies, including both low- and high-resolution records. Thus, there is a need for a uniform and transparent approach to assess the suitability of input proxy data for a reconstruction. Here, we develop classification criteria that are applicable to multiple proxy types and evaluate different selection strategies using a network of 62 millennium-long terrestrial hydroclimate proxy records from Monsoon Asia. Our results reveal that robust evidence for a coherent climate signal and high dating accuracy are important criteria for benchmarking the suitability of each proxy record. We determine these criteria by reviewing the literature for each record (rather than screening against instrumental data). We show that the proposed selection approach can yield a network with a stronger common signal. By evaluating the uncertainty and centennial variability of composite reconstructions, from differently selected subsets of the proxy network, it appears beneficial to use suitable proxies stemming from different archives, as well as having a dense network of proxy sites. We suggest that future large-scale palaeoclimate reconstructions might be improved by evaluating proxy networks according to the universal categories presented here and, if indicated, removing less suitable records. This will strengthen the climate signal in the final reconstruction, allowing more precise inferences about past climate variability and more robust comparisons with climate model simulations. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free