气候变化领域集成服务门户(CCPortal): The spectrum of Asian Monsoon variability: A proxy system model approach to the hydroclimate scaling mismatch

CCPortal

DOI	10.1016/j.quascirev.2020.106362
	The spectrum of Asian Monsoon variability: A proxy system model approach to the hydroclimate scaling mismatch
	Loope G.; Thompson D.; Overpeck J.
发表日期	2020
ISSN	0277-3791
卷号	240
英文摘要	Recent studies have found a significant mismatch between the amount of low-frequency variability in paleo-hydroclimate records and that simulated by climate models. However, uncertainties in how proxy systems record climate are significant, and the influence of low-frequency non-climate noise in paleoclimate archives is difficult to constrain. We use proxy system models to compare a network of mostly δ18O tree cellulose records from Monsoon Asia with isotope-enabled climate model output from (1) a coupled fully-forced version of iCESM (850–2005 CE), (2) isoGSM nudged toward the 20th Century Reanalysis (1871–2010 CE), and (3) an atmosphere-only run of iCAM5 with prescribed sea-surface temperatures from observations (1850–2014 CE). We identify a large discrepancy in scaling behavior between hydroclimate proxies and analogous iCESM pseudoproxies. In contrast, pseudoproxy networks based on climate models constrained by observations (isoGSM and iCAM5) have variance that continues to increase from decadal to multidecadal scales. This indicates that the mismatch arises from a failure of iCESM to simulate a sufficient amount of low-frequency hydroclimate variability. We test the influence of non-climate noise and photosynthate storage and find that they play a small role in elevating the low-frequency signal of proxies, but cannot explain the mismatch. Although our results are constrained to Monsoon Asia, the scaling of hydroclimate proxies across other regions and models have shown similar behavior, suggesting a proxy-model mismatch on a global scale that likely stems from an underestimation of low-frequency variability in fully coupled climate models. © 2020 Elsevier Ltd
英文关键词	Asia; Climate models; Hydroclimate continuum; Last millennium; Monsoon; Paleoclimatology; Proxy system models; Stable isotopes
语种	英语
scopus关键词	Atmospheric thermodynamics; Oceanography; Surface waters; Fully-coupled; Low frequency variability; Low-frequency signals; Paleoclimates; Photosynthates; Scaling behavior; Sea surface temperature (SST); System modeling; Climate models; climate modeling; historical record; hydrometeorology; monsoon; paleoclimate; proxy climate record; spectrum; Asia; Behavior; Frequency; Models; Noise; Oceanography; Records; Variability; Asia
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151438
作者单位	Department of Geosciences, University of Arizona, 1040 E 4th Street, Tucson, AZ 85721, United States; School for Environment and Sustainability, University of Michigan, 440 Church Street, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Loope G.,Thompson D.,Overpeck J.. The spectrum of Asian Monsoon variability: A proxy system model approach to the hydroclimate scaling mismatch[J],2020,240.
APA	Loope G.,Thompson D.,&Overpeck J..(2020).The spectrum of Asian Monsoon variability: A proxy system model approach to the hydroclimate scaling mismatch.Quaternary Science Reviews,240.
MLA	Loope G.,et al."The spectrum of Asian Monsoon variability: A proxy system model approach to the hydroclimate scaling mismatch".Quaternary Science Reviews 240(2020).