Climate Change Data Portal
DOI | 10.5194/cp-15-41-2019 |
Comparing the spatial patterns of climate change in the 9th and 5th millenniaBP from TRACE-21 model simulations | |
Ning, Liang1,2; Liu, Jian1,2; Bradley, Raymond S.3; Yan, Mi1,2 | |
发表日期 | 2019 |
ISSN | 1814-9324 |
EISSN | 1814-9332 |
卷号 | 15期号:1页码:41-52 |
英文摘要 | The spatial patterns of global temperature and precipitation changes, as well as corresponding large-scale circulation patterns during the latter part of the 9th and 5th millennia BP (4800-4500 versus 4500-4000 BP and 9200-8800 versus 8800-8000 BP) are compared through a group of transient simulations using the Community Climate System Model version 3 (CCSM3). Both periods are characterized by significant sea surface temperature (SST) decreases over the North Atlantic, south of Iceland. Temperatures were also colder across the Northern Hemisphere but warmer in the Southern Hemisphere. Significant precipitation decreases are seen over most of the Northern Hemisphere, especially over Eurasia and the Asian monsoon regions, indicating a weaker summer monsoon. Large precipitation anomalies over northern South America and adjacent ocean regions are related to a southward displacement of the Intertropical Convergence Zone (ITCZ) in that region. Climate changes in the late 9th millennium BP (the "8.2 ka event") are widely considered to have been caused by a large freshwater discharge into the northern Atlantic, which is confirmed in a meltwater forcing sensitivity experiment, but this was not the cause of changes occurring between the early and latter halves of the 5th millennium BP. Model simulations suggest that a combination of factors, led by long-term changes in insolation, drove a steady decline in SSTs across the North Atlantic and a reduction in the North Atlantic Meridional Overturning Circulation (AMOC), over the past 4500 years, with associated teleconnections across the globe, leading to drought in some areas. Multi-century-scale fluctuations in SSTs and AMOC strength were superimposed on this decline. This helps explain the onset of neoglaciation around 5000-4500 BP, followed by a series of neoglacial advances and retreats during recent millennia. The "4.2 ka BP Event" appears to have been one of several late Holocene multi-century fluctuations that were embedded in the long-term, low-frequency change in climate that occurred after similar to 4.8 ka. Whether these multi-century fluctuations were a response to internal centennialscale ocean-atmosphere variability or external forcing (such as explosive volcanic eruptions and associated feedbacks) or a combination of such conditions is not known and requires further study. |
WOS研究方向 | Geology ; Meteorology & Atmospheric Sciences |
来源期刊 | CLIMATE OF THE PAST
![]() |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/91995 |
作者单位 | 1.Nanjing Normal Univ, Key Lab Virtual Geog Environm, Minist Educ,Sch Geog Sci, State Key Lab Geog Environm Evolut,Jiangsu Prov C, Nanjing, Jiangsu, Peoples R China; 2.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing, Jiangsu, Peoples R China; 3.Univ Massachusetts, Dept Geosci, Climate Syst Res Ctr, Amherst, MA 01003 USA |
推荐引用方式 GB/T 7714 | Ning, Liang,Liu, Jian,Bradley, Raymond S.,et al. Comparing the spatial patterns of climate change in the 9th and 5th millenniaBP from TRACE-21 model simulations[J],2019,15(1):41-52. |
APA | Ning, Liang,Liu, Jian,Bradley, Raymond S.,&Yan, Mi.(2019).Comparing the spatial patterns of climate change in the 9th and 5th millenniaBP from TRACE-21 model simulations.CLIMATE OF THE PAST,15(1),41-52. |
MLA | Ning, Liang,et al."Comparing the spatial patterns of climate change in the 9th and 5th millenniaBP from TRACE-21 model simulations".CLIMATE OF THE PAST 15.1(2019):41-52. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。