Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM

doi:10.3390/atmos11060610

IEECAS OpenIR > 现代环境研究室

	Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM
	Guan, Jian 1; Liu, Zhengyu 1,2; Chen, Guangshan 3
通讯作者	Guan, Jian(lotusescy@gmail.com)
	2020-06-01
发表期刊	ATMOSPHERE
卷号	11 期号:6 页码:12
摘要	Stable water isotopologues in paleoclimate archives (delta 18O) have been widely used as an indicator to derive past climate variations. The modern observed spatial delta 18O-temperature relation in the middle and high latitudes has been used to infer the paleotemperatures changes from ice core data. However, various studies have shown that the spatial slope is larger than the temporal slope at the drill site by a factor of 2. Physically, the different spatial and temporal slope has been suggested to result from the amplified local surface air temperature cooling in the polar region at Last Glacial Maximum (LGM), according to the slope ratio equation derived in our previous study. To explicitly confirm the "polar amplification" effect in understanding the differences between temporal and spatial isotope-temperature relations, here we use the same isotope-enabled atmospheric general circulation model with a moisture-tracing module embedded to quantitatively estimate the contributions of different sources to the precipitated heavy oxygen isotopes in the middle and high latitudes. Our results show that the major sources of delta 18Oin precipitation over middle and high latitudes are from oceans where the sea surface temperature cooling at Last Glacial Maximum (LGM) is less than -2 degrees C, while the local moisture sources with a higher cooling can be also relevant for polar regions, such as north Greenland. Additionally, the neglect of the strengthened local inversion layer strength at LGM could be the main cause for the overestimated source temperature cooling by the slope ratio equation, especially for the polar regions in the Northern Hemisphere.
关键词	water isotope-temperature relation temporal slope spatial slope polar amplification moisture tagging
DOI	10.3390/atmos11060610
关键词[WOS]	GLACIAL-INTERGLACIAL CHANGES ; CLIMATE ; PRECIPITATION ; GREENLAND ; TEMPERATURES ; ISOTOPES ; ORIGIN ; RECORD
收录类别	SCI ; SCI
语种	英语
资助项目	Chinese NSF[41630527] ; US National Science Foundation[NSF P2C2]
WOS研究方向	Meteorology & Atmospheric Sciences
项目资助者	Chinese NSF ; US National Science Foundation
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000551743900001
出版者	MDPI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/15099
专题	现代环境研究室
通讯作者	Guan, Jian
作者单位	1.Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate Ocean & Atmosphere Studies, Beijing 100871, Peoples R China 2.Ohio State Univ, Dept Geog, Atmospher Sci Program, Columbus, OH 43210 USA 3.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Guan, Jian,Liu, Zhengyu,Chen, Guangshan. Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM[J]. ATMOSPHERE,2020,11(6):12.
APA	Guan, Jian,Liu, Zhengyu,&Chen, Guangshan.(2020).Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM.ATMOSPHERE,11(6),12.
MLA	Guan, Jian,et al."Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM".ATMOSPHERE 11.6(2020):12.