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Moisture Source Tagging Confirming the Polar Amplification Effect in Amplifying the Temperature-delta O-18 Temporal Slope Since the LGM
Guan, Jian1; Liu, Zhengyu1,2; Chen, Guangshan3
Corresponding AuthorGuan, Jian(lotusescy@gmail.com)
2020-06-01
Source PublicationATMOSPHERE
Volume11Issue:6Pages:12
AbstractStable 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.
Keywordwater isotope-temperature relation temporal slope spatial slope polar amplification moisture tagging
DOI10.3390/atmos11060610
WOS KeywordGLACIAL-INTERGLACIAL CHANGES ; CLIMATE ; PRECIPITATION ; GREENLAND ; TEMPERATURES ; ISOTOPES ; ORIGIN ; RECORD
Indexed BySCI ; SCI
Language英语
Funding ProjectChinese NSF[41630527] ; US National Science Foundation[NSF P2C2]
WOS Research AreaMeteorology & Atmospheric Sciences
Funding OrganizationChinese NSF ; US National Science Foundation
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000551743900001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/15099
Collection现代环境研究室
Corresponding AuthorGuan, Jian
Affiliation1.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
Recommended Citation
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.
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