A high-resolution Late Glacial to Holocene record of environmental change in the Mediterranean from Lake Ohrid (Macedonia/Albania)
A high-resolution Late Glacial to Holocene record of environmental change in the Mediterranean from Lake Ohrid (Macedonia/Albania)
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DOI：
10.1007/s00531-014-1033-6
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发表时间：
2015-09-01
影响因子：
2.3
通讯作者：
Wagner, Bernd
中科院分区：
文献类型：
--
作者：
Lacey, Jack H.;Francke, Alexander;Wagner, Bernd
奥赫里德湖（马其顿/阿尔巴尼亚）是欧洲现存最古老的湖泊，并展示了突出的地方生物多样性。在这里，我们提供了新的高分辨率稳定同位素和地球化学数据，从10米的核心（Co 1262）通过晚冰期到全新世，并讨论过去的气候和湖泊水文（TIC，三角洲C-13（方解石），三角洲O-18（方解石））以及陆地和水生植被对气候的响应（TOC，TOC/N，三角洲C-13（有机），岩石评估热解）。数据确定了3个主要区域：（1）晚冰期-全新世过渡，表现为低TIC和TOC含量，（2）全新世早期至中期，表现为高TOC和增加的TOC/N，（3）晚全新世-现在，表现为TIC和TOC显著降低。在一般情况下，增加三角洲O-18（方解石）从9万年到现在的总体趋势表明，通过全新世，与奥赫里德湖和更广泛的地中海地区以前的记录一致，逐步干旱化。几个代理显示相称的漂移，这意味着短期气候振荡的影响，如8.2 ka事件和小冰期。这是奥赫里德湖过去晚冰期和全新世气候的最佳日期和最高分辨率档案，并证实了北大西洋对地中海东北部的压倒性影响。所提供的数据为国际大陆科学钻探计划关于奥赫里德湖过去物种形成条件的科学合作项目提供了背景，该项目于2013年春夏恢复，可能可以追溯到下更新世，并将作为最近的校准，以重建整个湖泊历史上的气候和水文。
Lake Ohrid (Macedonia/Albania) is the oldest extant lake in Europe and exhibits an outstanding degree of endemic biodiversity. Here, we provide new high-resolution stable isotope and geochemical data from a 10 m core (Co1262) through the Late Glacial to Holocene and discuss past climate and lake hydrology (TIC, delta C-13(calcite), delta O-18(calcite)) as well as the terrestrial and aquatic vegetation response to climate (TOC, TOC/N, delta C-13(organic), Rock Eval pyrolysis). The data identifies 3 main zones: (1) the Late Glacial-Holocene transition represented by low TIC and TOC contents, (2) the early to mid-Holocene characterised by high TOC and increasing TOC/N and (3) the Late Holocene-Present which shows a marked decrease in TIC and TOC. In general, an overall trend of increasing delta O-18(calcite) from 9 ka to present suggests progressive aridification through the Holocene, consistent with previous records from Lake Ohrid and the wider Mediterranean region. Several proxies show commensurate excursions that imply the impact of short-term climate oscillations, such as the 8.2 ka event and the Little Ice Age. This is the best-dated and highest resolution archive of past Late Glacial and Holocene climate from Lake Ohrid and confirms the overriding influence of the North Atlantic in the north-eastern Mediterranean. The data presented set the context for the International Continental scientific Drilling Program Scientific Collaboration On Past Speciation Conditions in Lake Ohrid project cores recovered in spring-summer 2013, potentially dating back into the Lower Pleistocene, and will act as a recent calibration to reconstruct climate and hydrology over the entire lake history.