南大洋早古近纪异常温暖的地理范围再认识

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Paleoceanography and Paleoclimatology Pub Date : 2023-02-16 DOI:10.1029/2022PA004529
J. Frieling, S. Bohaty, M. Cramwinckel, S. Gallagher, G. Holdgate, T. Reichgelt, F. Peterse, J. Pross, A. Sluijs, P. Bijl
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引用次数: 0

摘要

为了评估古近纪南大洋的地带性温度和生物地理格局,我们提供了最新古新世(~ 57 ~ 56 Ma)和古新世—始新世热最大值(PETM;~ 56 Ma)来自南-南海湾(AAG)北缘。各种代理数据集记录了众所周知的晚古新世变暖,并叠加了两个短暂的晚古新世前指针变暖事件,比PETM早数百kyr。值得注意的是,在最晚的古新世、PETM和早始新世气候最佳(~ 53-49 Ma)期间,AAG和西南太平洋的温度重建显示出相似的趋势,以及封闭的塔斯马尼亚门户以东和以西相似的绝对温度。我们的数据表明,先前研究记录的西南太平洋异常温暖向西延伸到AAG。这与模拟得出的环流和温度模式形成对比。我们认为,由于分辨率不足,海洋环流模拟低估了西南太平洋的热输送,没有考虑到中尺度涡旋相关的热输送。我们主张采用一种系统的方法来解决在边缘海洋环境和非模拟高纬度气候中可能出现的模型和代理偏差,以评估温度重建。
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Revisiting the Geographical Extent of Exceptional Warmth in the Early Paleogene Southern Ocean
To assess zonal temperature and biogeographical patterns in the Southern Ocean during the Paleogene, we present new multi‐proxy air‐ and sea‐surface temperature data for the latest Paleocene (∼57–56 Ma) and the Paleocene‐Eocene Thermal Maximum (PETM; ∼56 Ma) from the northern margin of the Australo‐Antarctic Gulf (AAG). The various proxy data sets document the well‐known late Paleocene warming and, superimposed, two transient late Paleocene pre‐cursor warming events, hundreds of kyr prior to the PETM. Remarkably, temperature reconstructions for the AAG and southwest Pacific during the latest Paleocene, PETM and Early Eocene Climatic Optimum (∼53–49 Ma) show similar trends as well as similar absolute temperatures east and west of the closed Tasmanian Gateway. Our data imply that the exceptional warmth as recorded by previous studies for the southwest Pacific extended westward into the AAG. This contrasts with modeling‐derived circulation and temperature patterns. We suggest that simulations of ocean circulation underestimate heat transport in the southwest Pacific due to insufficient resolution, not allowing for mesoscale eddy‐related heat transport. We argue for a systematic approach to tackle model and proxy biases that may occur in marginal marine settings and non‐analog high‐latitude climates to assess the temperature reconstructions.
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来源期刊
Paleoceanography and Paleoclimatology
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.
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