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Glacial and Holocene terrestrial temperature variability in subtropical east Australia as inferred from branched GDGT distributions in a sediment core from Lake McKenzie

机译：从麦肯锡湖沉积物中的GDGT分支分布可以推断出亚热带东部澳大利亚的冰川和全新世陆地温度变化

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摘要

Branched glycerol dialkyl glycerol tetraether (GDGT) distributions observed in a sediment core from Lake McKenzie were utilized to quantitatively reconstruct the pattern of mean annual air temperature (MAAT) from coastal subtropical eastern Australia between 37 and 18.3 cal ka BP and 14.0 cal ka BP to present. Both the reconstructed trend and amplitude of MAAT changes from the top of the sediment core were nearly identical to a local instrumental MAAT record from Fraser Island, providing confidence that in this sediment core branched GDGTs could be used to produce a quantitative record of past MAAT. The reconstructed trend of MAAT during 37 to 18.3 cal ka BP and timing of the Last Glacial Maximum (LGM) in the Lake McKenzie record were in agreement with previously published nearby marine climate records. The amplitude of lower-than-present MAAT during the LGM potentially provides information on the latitude of separation of the Tasman Front from the East Australian current in the subtropical western Pacific. The Lake McKenzie record shows an earlier onset of near modern day warm temperatures in the early Holocene compared to marine records and the presence of a warmer than present day period during the mid-Holocene. © 2014, University of Washington.
机译：利用麦肯齐湖沉积物芯中观察到的支化甘油二烷基甘油四醚（GDGT）分布，定量重建了澳大利亚东部沿海亚热带地区的37到18.3 cal ka BP和14.0 cal ka BP之间的平均年气温（MAAT）模式。当下。从沉积物核心顶部的MAAT变化趋势和幅度的重建趋势与弗雷泽岛的本地仪器MAAT记录几乎相同，这提供了在该沉积物核心中分支GDGT可用于生成过去MAAT定量记录的信心。在37到18.3 cal ka BP期间，MAAT的重建趋势以及麦肯锡湖记录中的最后一次冰期最大值（LGM）的时间与先前公布的附近海洋气候记录相符。 LGM期间MAAT低于当前的幅度可能提供有关塔斯曼锋与亚热带西太平洋东澳大利亚洋流分离纬度的信息。麦肯齐湖的记录显示，与海洋记录相比，全新世早期早于近全新世温度升高，并且在全新世中期还存在比今天更暖的时期。 ©2014，华盛顿大学。

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