Model‐Data Comparison of Antarctic Winter Sea‐Ice Extent and Southern Ocean Sea‐Surface Temperatures During Marine Isotope Stage 5e

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Paleoceanography and Paleoclimatology Pub Date : 2023-05-24 DOI:10.1029/2022PA004600

M. Chadwick, L. Sime, C. Allen, Maria-Vittoria Guarino

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Abstract

Marine Isotope Stage (MIS) 5e (130–116 ka) represents a “laboratory” for evaluating climate model performance under warmer‐than‐present conditions. Climate model simulations for MIS 5e have previously failed to produce Southern Ocean (SO) sea‐surface temperatures (SSTs) and sea‐ice extent reconstructed from marine sediment core proxy records. Here we compare state of the art HadGEM3 and HadCM3 simulations of Peak MIS 5e SO summer SSTs and September sea‐ice concentrations with the latest marine sediment core proxy data. The model outputs and proxy records show the least consistency in the regions located near the present‐day SO gyre boundaries, implying the possibility that model simulations are currently unable to fully realize changes in gyre extent and position during MIS 5e. Including Heinrich 11 meltwater forcing in Peak MIS 5e climate simulations improves the likeness to proxy data but it is clear that longer (3–4 ka) run times are required to fully test the consistency between models and data.

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海洋同位素阶段5e期间南极冬季海冰范围和南大洋海面温度的模式数据比较

海洋同位素阶段(MIS) 5e (130-116 ka)是评估气候模式在比现在更温暖条件下性能的“实验室”。MIS 5e的气候模式模拟以前未能产生根据海洋沉积物岩心代理记录重建的南大洋(SO)海表温度(SSTs)和海冰范围。在这里，我们比较了最新的HadGEM3和HadCM3模拟MIS 5e SO夏季海温峰值和9月海冰浓度与最新的海洋沉积物岩心代理数据。模式输出和代理记录显示，位于现今SO环流边界附近的区域的一致性最低，这意味着模式模拟目前可能无法完全实现MIS 5e期间环流范围和位置的变化。在Peak MIS 5e气候模拟中包括Heinrich 11融水强迫提高了与代理数据的相似性，但很明显，需要更长的(3-4 ka)运行时间来充分测试模型和数据之间的一致性。

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来源期刊

Paleoceanography and Paleoclimatology Earth and Planetary Sciences-Atmospheric Science

CiteScore

6.20

自引率

11.40%

发文量

107

期刊介绍： Paleoceanography and Paleoclimatology (PALO) publishes papers dealing with records of past environments, biota and climate. Understanding of the Earth system as it was in the past requires the employment of a wide range of approaches including marine and lacustrine sedimentology and speleothems; ice sheet formation and flow; stable isotope, trace element, and organic geochemistry; paleontology and molecular paleontology; evolutionary processes; mineralization in organisms; understanding tree-ring formation; seismic stratigraphy; physical, chemical, and biological oceanography; geochemical, climate and earth system modeling, and many others. The scope of this journal is regional to global, rather than local, and includes studies of any geologic age (Precambrian to Quaternary, including modern analogs). Within this framework, papers on the following topics are to be included: chronology, stratigraphy (where relevant to correlation of paleoceanographic events), paleoreconstructions, paleoceanographic modeling, paleocirculation (deep, intermediate, and shallow), paleoclimatology (e.g., paleowinds and cryosphere history), global sediment and geochemical cycles, anoxia, sea level changes and effects, relations between biotic evolution and paleoceanography, biotic crises, paleobiology (e.g., ecology of “microfossils” used in paleoceanography), techniques and approaches in paleoceanographic inferences, and modern paleoceanographic analogs, and quantitative and integrative analysis of coupled ocean-atmosphere-biosphere processes. Paleoceanographic and Paleoclimate studies enable us to use the past in order to gain information on possible future climatic and biotic developments: the past is the key to the future, just as much and maybe more than the present is the key to the past.