Resultados de modelo UVic Ultima Deglaciacion - UVic model output Last Deglaciation
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Fecha
Publicador:
Consejo Nacional de Investigaciones Científicas y Técnicas
Fecha de depósito:
30/07/2025
Fecha de creación:
29/07/2025
Clasificación temática
Palabras clave
Resumen
Resultado de un ensamble de simulaciones entre el Último Máximo Glaciar y la última deglaciación temprana (23-15 ka). Se incluyen diferentes forzantes relacionados con posibles cambios ocurridos durante la última deglaciación. A continuación se incluye un texto (en inglés) donde se detallan las simulaciones. Las variables documentadas son físicas, biogeoquímicas, e isotópicas. Results from a model ensemble of simulations between the Last Glacial Maximum and the last deglaciation (23-15 ka). We include different forcings associated with different deglacial processes. We document physical, biogeochemical, and isotope variables.
Información Técnica
Control includes transient changes in land ice sheets calculated after the ICE6G-C reconstruction, which represent an 8% decrease between 20 and 15 ka BP in the ice sheet volume of the Northern Hemisphere. LDust is as Control but a gradual reduction in atmospheric iron flux is applied. The reduction was calculated by scaling atmospheric soluble iron flux over the SO with the ELD decrease on dust flux determined from Antarctic ice cores. This results in a 85 % decrease between 20 and 15 ka, in line with estimates of deglacial soluble iron flux changes from ice cores. LFWF is as Control but surface FWF are applied between 20 and 15 ka in the North Atlantic, North-East Pacific, and SO (around Patagonia), to account for glacier discharge from the melting of land ice sheets. The grid boxes where the fresh water fluxes were applied, as well as the fraction of that flux going into each region, follow a glacier discharge plume map determined from a drainage network model. Most (86 %) of that flux goes into the North Atlantic Ocean, and only 10 and 6 % go into the North-East Pacific and Southern Oceans, respectively. The total FWF applied is 0.06 Sv, calculated after an estimate of volume equivalent sea level change during the first 3 ka of the last deglaciation, reconstructed from coral and sediment records. That volume equivalent sea level change reconstruction suggests fresh water fluxes of 0.06 Sv between 20 and 17 ka BP, and of 0.15 Sv between 17 and 15 ka BP. Applying 0.06 Sv between 20 and 15 ka in the LFWF simulation functions as a lower limit for the effects of FWF to the deglacial ocean. It produces an AMOC that is weaker and shallower than in Control, but is still active. HFWF is as LFWF but the fresh water forcing is increased to 0.15 Sv between 17 and 15 ka, following estimates of volume equivalent sea level change during that interval. In this case, the transport of the AMOC linearly decreases and collapses by 15 ka BP. SOWind is as Control but a 5° poleward shift and a gradual strengthening in the zonal wind stress over the SO are applied. These changes follow qualitative estimates of differences between LGM and Holocene wind stress in sup-polar regions. Some of the PMIP models, equipped with a three dimensional atmosphere coupled to the ocean component, predict lower wind stress intensity over the SO in their LGM simulations. The wind stress strengthening applied in SOWind serves as a way to study the sensitivity of deep ocean tracers to changes in SO ventilation. SOWind LDust is a combination of the SOWind and LDust simulations. LFWF SOWind LDust is a combination of the LFWF and SOWind LDust simulations. HFWF SOWind LDust is a combination of the HFWF and SOWind LDust simulations.
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