Forward modeling of δ18O in Andean ice cores
Abstract Tropical ice core archives are among the best dated and highest resolution from the tropics, but a thorough understanding of processes that shape their isotope signature as well as the simulation of observed variability remain incomplete. To address this, we develop a tropical Andean ice co...
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| Format: | Article |
| Language: | English |
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Wiley
2016-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL070150 |
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| author | J. V. Hurley M. Vuille D. R. Hardy |
| author_facet | J. V. Hurley M. Vuille D. R. Hardy |
| author_sort | J. V. Hurley |
| collection | DOAJ |
| description | Abstract Tropical ice core archives are among the best dated and highest resolution from the tropics, but a thorough understanding of processes that shape their isotope signature as well as the simulation of observed variability remain incomplete. To address this, we develop a tropical Andean ice core isotope forward model from in situ hydrologic observations and satellite water vapor isotope measurements. A control simulation of snow δ18O captures the mean and seasonal trend but underestimates the observed intraseasonal variability. The simulation of observed variability is improved by including amount effects associated with South American cold air incursions, linking synoptic‐scale disturbances and monsoon dynamics to tropical ice core δ18O. The forward model was calibrated with and run under present‐day conditions but can also be driven with past climate forcings to reconstruct paleomonsoon variability. The model is transferable and may be used to render a (paleo)climatic context at other ice core locations. |
| format | Article |
| id | doaj-art-354ad7cf5ed04c2ead459c327c2481e2 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-354ad7cf5ed04c2ead459c327c2481e22025-08-20T01:51:54ZengWileyGeophysical Research Letters0094-82761944-80072016-08-0143158178818810.1002/2016GL070150Forward modeling of δ18O in Andean ice coresJ. V. Hurley0M. Vuille1D. R. Hardy2Department of Atmospheric and Environmental Sciences State University of New York at Albany Albany New York USADepartment of Atmospheric and Environmental Sciences State University of New York at Albany Albany New York USADepartment of Geosciences University of Massachusetts Amherst Amherst Massachusetts USAAbstract Tropical ice core archives are among the best dated and highest resolution from the tropics, but a thorough understanding of processes that shape their isotope signature as well as the simulation of observed variability remain incomplete. To address this, we develop a tropical Andean ice core isotope forward model from in situ hydrologic observations and satellite water vapor isotope measurements. A control simulation of snow δ18O captures the mean and seasonal trend but underestimates the observed intraseasonal variability. The simulation of observed variability is improved by including amount effects associated with South American cold air incursions, linking synoptic‐scale disturbances and monsoon dynamics to tropical ice core δ18O. The forward model was calibrated with and run under present‐day conditions but can also be driven with past climate forcings to reconstruct paleomonsoon variability. The model is transferable and may be used to render a (paleo)climatic context at other ice core locations.https://doi.org/10.1002/2016GL070150South American summer monsoonQuelccaya Ice Capcold air incursionforward modelice core |
| spellingShingle | J. V. Hurley M. Vuille D. R. Hardy Forward modeling of δ18O in Andean ice cores Geophysical Research Letters South American summer monsoon Quelccaya Ice Cap cold air incursion forward model ice core |
| title | Forward modeling of δ18O in Andean ice cores |
| title_full | Forward modeling of δ18O in Andean ice cores |
| title_fullStr | Forward modeling of δ18O in Andean ice cores |
| title_full_unstemmed | Forward modeling of δ18O in Andean ice cores |
| title_short | Forward modeling of δ18O in Andean ice cores |
| title_sort | forward modeling of δ18o in andean ice cores |
| topic | South American summer monsoon Quelccaya Ice Cap cold air incursion forward model ice core |
| url | https://doi.org/10.1002/2016GL070150 |
| work_keys_str_mv | AT jvhurley forwardmodelingofd18oinandeanicecores AT mvuille forwardmodelingofd18oinandeanicecores AT drhardy forwardmodelingofd18oinandeanicecores |