Abstract
How long the present interglacial will last remains under debate. This project aims to determine the climatic mechanisms and sequence of events terminating an interglacial period. By comparing new paleoclimate reconstructions and climate model experiments, we investigate the impact of South American rainfall changes on tropical Atlantic sea-surface salinity and Atlantic thermohaline circulation at the end of the Last Interglacial (LIG). Model and proxy data show gradually intensifying South American monsoonal precipitation and enhanced Amazon discharge through the LIG, in response to increasing austral summer insolation. However, an increased meridional temperature gradient at the end of the LIG caused a strengthening of the North Brazil Current retroflection which deflected eastward the Amazon freshwater plume. Such changes in South American river discharge contributed to decrease tropical and North Atlantic surface salinities, resulting in a shift in regions of North Atlantic deep water convection and small reduction in deep water formation.
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References
Bakker P, Stone EJ, Charbit S, Gröger M, Krebs-Kanzow U, Ritz SP, Varma V, Khon V, Lunt DJ, Mikolajewicz U, Prange M, Renssen H, Schneider B, Schulz M (2013) Last interglacial temperature evolution—a model inter-comparison. Clim Past 9(2):605–619. doi:10.5194/cp-9-605-2013
Cheng H, Sinha A, Cruz FW, Wang X, Edwards RL, d’Horta FM, Ribas CC, Vuille M, Stott LD, Auler AS (2013) Climate change patterns in Amazonia and biodiversity. Nat Commun 4:1411. doi:10.1038/ncomms2415
Govin A, Chiessi CM, Zabel M, Sawakuchi AO, Heslop D, Hörner T, Zhang Y, Mulitza S (2014) Terrigenous input off northern South America driven by changes in Amazonian climate and the North Brazil current retroflection during the last 250 ka. Clim Past 10:843–862. doi:10.5194/cp-10-843-2014
Guyot JL, Jouanneau JM, Soares L, Boaventura GR, Maillet N, Lagane C (2007) Clay mineral composition of river sediments in the Amazon Basin. Catena 71(2):340–356. doi:10.1016/j.catena.2007.02.002
Krebs U, Timmermann A (2007) Tropical air-sea interactions accelerate the recovery of the atlantic meridional overturning circulation after a major shutdown. J Clim 20(19):4940–4956. doi:10.1175/jcli4296.1
Lentz SJ (1995) Seasonal variations in the horizontal structure of the Amazon Plume inferred from historical hydrographic data. J Geophys Res Oceans 100(C2):2391–2400. doi:10.1029/94jc01847
Tzedakis PC, Channell JET, Hodell DA, Kleiven HF, Skinner LC (2012) Determining the natural length of the current interglacial. Nat Geosci 5(2):138–141. doi:10.1038/ngeo1358
Wilson KE, Maslin MA, Burns SJ (2011) Evidence for a prolonged retroflection of the North Brazil current during glacial stages. Palaeogeogr Palaeoclimatol Palaeoecol 301(1–4):86–96. doi:10.1016/j.palaeo.2011.01.003
Yeager SG, Shields CA, Large WG, Hack JJ (2006) The low-resolution CCSM3. J Clim 19(11):2545–2566. doi:10.1175/jcli3744.1
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Govin, A., Blazey, B., Prange, M., Paul, A. (2015). What Ends an Interglacial? Feedbacks Between Tropical Rainfall, Atlantic Climate and Ice Sheets During the Last Interglacial. In: Schulz, M., Paul, A. (eds) Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC). SpringerBriefs in Earth System Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-00693-2_5
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