Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Justino, Flávio; Lindemann, Douglas; Kucharski, Fred; Wilson, Aaron B.; Bromwich, David H.; Stordal, Frøde

doi:10.5194/cp-13-1081-2017

Cited by 5 publications

References 87 publications

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Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

et al. 2023

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Based on coupled climate experiments conducted with the coupled ICTP-CGCM model focusing on interglacial stages MIS5e (127 ka), MIS11c (409 ka) and MIS31 (1,072 ka), the Austral summer monsoonal system is investigated. The interannual variability and intensity of monsoon events are analysed from vorticity indices and air-sea interaction processes for Africa, Australia and South America monsoons. Results demonstrated with respect to present day conditions, an orbital driven decrease in precipitation in summer, but slightly shift of the onset and demise periods of monsoons. Sensitivity experiments indicate, furthermore, that the monsoons are forced not only by external factors such as the dominant effect of insolation, but also by distant climate anomalies, such as surface temperature of the equatorial Atlantic and Pacific basins. During the interglacial stages, cooling occurs in the Southern Hemisphere whereas Northern Hemisphere substantially warms, inducing remarkable changes in the position of the oceanic subtropical high pressure systems and equatorial convergence zone. Regionally, these mechanisms contribute to periods of drought, with reduced precipitation rate over sectors of the Amazon and Northeastern Brazil, northern Australia and southern Africa. Monsoonal rainfall shows different responses to precessional forcing, as well as the relationship between the monsoon and Niño 3.4 differs among the interglacial stages. Compared to current climate, correlation

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Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

et al. 2023

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Past Antarctic ice sheet dynamics (PAIS) and implications for future sea-level change

Colleoni

Santis

Naish

et al. 2022

Antarctic Climate Evolution

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Climate response to drastically modified PDO, PNA and NAM in the superinterglacial MIS 31

Justino

Gurjão

Lindemann

2021

Boreas

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The Pacific Decadal Oscillation (PDO), the Pacific-North American Pattern (PNA) and the Northern Annular Mode (NAM) influence the Northern Hemisphere climate over all sorts of time scales, from days to decades. This study evaluates these climate modes under drastically modified conditions. It is found that in Marine Isotope Stage 31 (MIS 31), an interglacial with enhanced seasonal amplitude, the PDO, PNA and NAM are completely different in their temporal and spatial patternswith respect to current conditions. Moreover, the MIS 31 boundary conditions induce an amplification of the interannual variability, but a suppression of the decadal peak. It is found that changes in the airsea interaction in the NH, in particular due to a weaker Aleutian low, are responsible for the absence of the decadal periodicity. However, no large changes are verified in terms of explained variance of those modes with respect to CTR. However, the amplitude of response related to the PDO, NAM and PNA is weaker in the MIS 31 experiment, very likely due to a reduced meridional thermal gradient. The results presented here are useful for palaeoreconstruction interpretation because proxies may reproduce dominant characteristics of temperature and precipitation related to the persistence of those modes of variability. Thus, their ability to reproduce long-term environmental conditions in some situations can be related to a preferential phase of the PDO, PNA and NAM.

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Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

Cited by 5 publications

References 87 publications

Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

Southern hemisphere monsoonal system during superinterglacial stages: MIS5e, MIS11c and MIS31

Past Antarctic ice sheet dynamics (PAIS) and implications for future sea-level change

Climate response to drastically modified PDO, PNA and NAM in the superinterglacial MIS 31

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