Understanding the temporal slope of the temperature-water isotope relation during the deglaciation using isoCAM3: The slope equation

The temporal and spatial slopes of water isotope-temperature relations are studied for the last 21,000years over the middle and high latitudes using a series of snapshot simulations of global climate and water isotopes in the isotope-enabled atmospheric model isoCAM3. Our model simulation suggests t...

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Bibliographic Details
Published in:Journal of Geophysical Research: Atmospheres
Main Authors: Guan, Jian, Liu, Zhengyu, Wen, Xinyu, Brady, Esther, Noone, David, Zhu, Jiang, Han, Jing
Other Authors: Guan, J (reprint author), Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate Ocean & Atmosphere Studies, Beijing, Peoples R China.; Liu, ZY (reprint author), Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA., Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate Ocean & Atmosphere Studies, Beijing, Peoples R China., Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA., Univ Wisconsin, Ctr Climate Res, Nelson Inst Environm Studies, Madison, WI USA., NCAR, Climate & Global Dynam, Earth Syst Lab, Boulder, CO USA., Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA., Liu, ZY (reprint author), Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA.
Format: Journal/Newspaper
Language:English
Published: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 2016
Subjects:
stable water isotope-temperature relationship
temporal slope
spatial slope
slope equation
LAST GLACIAL MAXIMUM
ICE CORE
CENTRAL GREENLAND
OXYGEN
PRECIPITATION
PALEOTHERMOMETER
RECONSTRUCTION
CONSTRAINTS
CALIBRATION
DELTA-O-18
Greenland
ice core
Online Access:https://hdl.handle.net/20.500.11897/457527
https://doi.org/10.1002/2016JD024955
Description
Summary:The temporal and spatial slopes of water isotope-temperature relations are studied for the last 21,000years over the middle and high latitudes using a series of snapshot simulations of global climate and water isotopes in the isotope-enabled atmospheric model isoCAM3. Our model simulation suggests that both the temporal slope and spatial slope remain largely stable throughout the last deglaciation. Furthermore, the temporal slope can vary substantially across regions. Nevertheless, on average, and most likely, the temporal slope is about 0.3 degrees C-1 and is about half of the spatial slope. Finally, the relation between temporal and spatial slopes is understood using a semiempirical equation that is derived based on both the Rayleigh distillation and a fixed spatial slope. The slope equation quantifies the Boyle's mechanism and suggests that the temporal slope is usually smaller than the spatial slope in the extratropics mainly because of the polar amplification feature in global climate change, such that the response in local temperature at middle and high latitudes is usually greater than that in the total equivalent source temperature. National Science Foundation of China [41130105, 41130962, 41005035]; China Scholarship Council; NSF C2P2; DOE SciDac SCI(E) ARTICLE lotusescy@pku.edu.cn; zliu3@wisc.edu 17 10342-10354 121

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