The Brewer‐Dobson circulation during the last glacial maximum
The Brewer‐Dobson circulation during the Last Glacial Maximum (LGM) is investigated in simulations using the Whole Atmosphere Community Climate Model version 6. We examine vertical mass fluxes, age of stratospheric air, and the transformed Eulerian mean stream function and find that the modeled annu...
| Autores: | , , , , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/186415 |
| Acesso em linha: | https://hdl.handle.net/2117/186415 https://dx.doi.org/10.1029/2019GL086271 |
| Access Level: | acceso abierto |
| Palavra-chave: | Computer simulation Atomospheric ozone Climatic changes Troposphere Last Glacial Maximum Brewer‐Dobson circulation Large‐scale stratospheric circulation Last glacial maximum (LGM) Climate simulation Resolved wave drag Parameterized orographic gravity wave drag Simulació per ordinador Estratosfera Ozó atmosfèric Canvis climàtics Àrees temàtiques de la UPC::Informàtica::Impacte ambiental |
| Resumo: | The Brewer‐Dobson circulation during the Last Glacial Maximum (LGM) is investigated in simulations using the Whole Atmosphere Community Climate Model version 6. We examine vertical mass fluxes, age of stratospheric air, and the transformed Eulerian mean stream function and find that the modeled annual‐mean Brewer‐Dobson circulation during the LGM is almost everywhere slower than that in the modern climate (with or without anthropogenic ozone depleting substances). Compared to the modern climate, the annual‐mean tropical upwelling in the LGM is 11.3–16.9%, 11.2–15.8%, and 4.4–10.2% weaker, respectively, at 100, 70, and 30 hPa. Simulated decreases in annual‐mean mass fluxes at 70 and 100 hPa are caused by a weaker parameterized orographic gravity wave drag and resolved wave drag, respectively. |
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