Sea ice and wind variability during the Holocene in East Antarctica: insight on middle-high latitude coupling
Sea ice and wind variability during the Holocene in East Antarctica: insight on middle-high latitude coupling
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DOI：
10.1016/j.quascirev.2010.08.007
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发表时间：
2010-12-01
影响因子：
4
通讯作者：
Giraudeau, Jacques
中科院分区：
文献类型：
--
作者：
Denis, Delphine;Crosta, Xavier;Giraudeau, Jacques
微体古生物学和生物标志物数据从两个高积累的海洋站点从东南极洲（阿德利土地在类似于140度E和东Prenchez湾在类似于77度E）的沿海和大陆架区（CCSZ）被用来重建全新世海冰和风应力的变化在流域范围内的规模。这些数据表明，自7 cal ka BP以来，这两个地区的海冰浓度/持续性和风应力相关的海面湍流一致增加，自4.5-3.5 cal ka BP以来信号特别强。这些高纬度记录与海冰和湍流记录从南部中纬度地区的比较突出了独特的气候演变，根据不同的纬度带。东南极CCSZ海冰持续存在和湍流增加与南纬55至45度之间东大西洋和印度地区4.5-3.5 calka BP后记录的海面变暖和海冰退缩相反。在同一时期，古资料表明，SST冷却在所有主要的沿海上升流系统的南半球，造成北运输的副极地表面沃茨作为一个响应南西风增强。因此，我们建议，建议为北方半球，全新世的纬度日射梯度的变化，主要是由强迫和岁差和放大的海冰和冰川冰在南极领域的扩张，是负责观察到的南半球的纬度模式对比。(C)2010爱思唯尔有限公司版权所有。
Micropaleontological and biomarker data from two high-accumulation marine sites from the Coastal and Continental Shelf Zone (CCSZ) off East Antarctica (Adelie Land at similar to 140 degrees E and eastern Prydz Bay at similar to 77 degrees E) are used to reconstruct Holocene changes in sea ice and wind stress at the basin-wide scale. These data demonstrate congruent increase in sea-ice concentration/persistence and wind stress-related sea-surface turbulence in the two regions since 7 cal ka BP, with a particularly strong signal since 4.5-3.5 cal ka BP. Comparison of these high latitude records with sea ice and turbulence records from the southern mid-latitudes highlights distinctive climatic evolutions according to the different latitudinal bands. Sea-ice persistence and turbulence increase in East Antarctica CCSZ are opposite to sea-surface warming and sea-ice retreat recorded after 4.5-3.5 cal ka BP in the East Atlantic and Indian sector between 55 and 45 S. At the same period, paleodata suggest SST cooling in all major coastal upwelling systems of the southern hemisphere, caused by the northward transport of subpolar surface waters as a response to southern Westerlies reinforcement. We therefore propose, as suggested for the northern hemisphere, that Holocene changes in the latitudinal insolation gradient, primarily forced by obliquity and precession and amplified by sea-ice and glacial-ice expansions in the Antarctic realm, are responsible for the observed contrasted latitudinal patterns of southern latitudes. (C) 2010 Elsevier Ltd. All rights reserved.