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首页> 外文期刊>Regional Environmental Change >Evidence for a warm and humid Mid-Holocene episode in the Aegean and northern Levantine Seas (Greece, NE Mediterranean)
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Evidence for a warm and humid Mid-Holocene episode in the Aegean and northern Levantine Seas (Greece, NE Mediterranean)

机译：爱琴海和黎凡特海北部（希腊东北部地中海）温暖湿润的全新世中期的证据

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摘要

Marine and terrestrial biological and biogeo-chemical proxies in three sediment cores from North and SE Aegean and northern Levantine Seas record continuous warm and humid conditions between 5.5 and 4.0 ka BP related to the establishment of relatively stratified conditions in the upper water column. These conditions may have resulted from the concordant albeit weak Mid-Holocene South Asian monsoon forcing, combined with lighter Etesian winds. During this interval, sea surface temperatures fluctuate in the Aegean Sea, although exhibiting a strong positive shift at ～4.8 ka BP. The warm and humid climatic conditions triggered upper water column stratification and enhancement of the deep chlorophyll maximum (DCM), leading to dysoxic conditions and the deposition of a sa-propel-like layer, but only in the SE Aegean site. In contrast to the shallow water SE Aegean, the deeper North Aegean and the northern Levantine sites, although experiencing stratification in the upper parts of the water column, did not achieve bottom-water dysoxia. Thus, a top-bottom mechanism of stratification-DCM development accompanied by fast transport and burial of organic matter is a likely explanation for the preservation of productivity signal in the shallow sites of the SE Aegean and establishment of sa-propelic conditions during the warm and humid Mid-Holocene. The termination of the Mid-Holocene warm and humid phase coincides with the "4.2 ka" climate event. Our data exhibit an N-S time transgressive aridification gradient around the Aegean Sea, most probably associated with the reorganization of the general atmospheric circulation during the Mid-Holocene.
机译：来自北爱琴海和东南爱琴海以及黎凡特海北部三个沉积岩心的海洋和陆地生物和生物地球化学代理人记录到5.5至4.0 ka BP之间持续的温暖和潮湿条件，这与上水柱中相对分层条件的建立有关。这些条件可能是由于中全新世南亚季风强迫的协和作用，尽管与弱的埃特西亚风相结合。在此间隔期间，尽管在〜4.8 ka BP处表现出强烈的正向变化，但爱琴海的海表温度仍在波动。温暖和潮湿的气候条件引发了上层水柱分层和深层叶绿素最大值（DCM）的增强，从而导致了缺氧条件和类似sa-propel层的沉积，但仅限于东南爱琴海地区。与浅水爱琴海相反，较深的北爱琴海和黎凡特北部站点虽然在水柱的上部经历了分层，但并未实现底水的渗透不良。因此，分层-DCM发育伴随着快速运输和掩埋有机物的自上而下的机制可能是在东南部爱琴海浅层地区保留生产力信号并在温暖和温暖的季节建立sa-propelic条件的可能解释。中全新世。中全新世暖湿阶段的终止与“ 4.2 ka”气候事件相吻合。我们的数据显示出爱琴海周围存在N-S时移的干旱化梯度，这很可能与全新世中期大气环流的重组有关。

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  • 来源
    《Regional Environmental Change》 |2014年第5期|1697-1712|共16页
  • 作者

    M. V. Triantaphyllou; A. Gogou; I. Bouloubassi; M. Dimiza; K. Kouli; G. Rousakis; U. Kotthoff; K.-C. Emeis; M. Papanikolaou; M. Athanasiou; C. Parinos; C. Ioakim; V. Lykousis;

  • 作者单位

    Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece;

    Institute of Oceanography, Hellenic Centre for Marine Research, 19013 Anavyssos, Greece;

    Laboratoire d'Oceanographie et du Climat, Experimentation et Approche Numerique, Universite Pierre et Marie Curie, Paris Cedex 05, France;

    Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece;

    Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece;

    Institute of Oceanography, Hellenic Centre for Marine Research, 19013 Anavyssos, Greece;

    Geologisch-Palaeontologisches Institut und Museum, Universitaet Hamburg, Bundesstr. 55, 20146 Hamburg, Germany;

    Institut fuer Biogeochemie und Meereschemie, Universitaet Hamburg, Bundesstr. 55, 20146 Hamburg, Germany;

    Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece;

    Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece;

    Institute of Oceanography, Hellenic Centre for Marine Research, 19013 Anavyssos, Greece;

    Institute of Geology and Mineral Exploration, Olympic Village, 13677 Acharnae-Attiki, Greece;

    Institute of Oceanography, Hellenic Centre for Marine Research, 19013 Anavyssos, Greece;

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  • 正文语种 eng
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  • 关键词

    Mid-Holocene; NE Mediterranean; Warm; Humid; Climate; Multiproxy;

    机译：中全新世地中海东北部;暖;湿;气候;多代理;

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