Preboreal climate oscillations in Europe: Wiggle-match dating and synthesis of Dutch high-resolution multi-proxy records
Preboreal climate oscillations in Europe: Wiggle-match dating and synthesis of Dutch high-resolution multi-proxy records
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DOI：
10.1016/j.quascirev.2006.09.012
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发表时间：
2007-08
影响因子：
4
通讯作者：
J. Bos;B. Geel;J. Plicht;S. Bohncke
中科院分区：
文献类型：
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作者：
J. Bos;B. Geel;J. Plicht;S. Bohncke
为了比较环境和推断的气候变化，在荷兰的前北方，五个陆地记录进行了分析。详细的多代理分析，包括微体化石（例如，花粉、孢子、藻类和真菌孢子），大残体（例如，种子、果实、木材、苔藓等），并以高时间分辨率进行烧失量测量。为了将这五个记录联系起来，通过AMS 14 C摆动匹配测年法制作了准确的年表。荷兰的记录显示，在晚冰期/全新世气候变暖之后，桦树林地在前寒武纪的弗里斯兰期（英语：Friesland Phase of the Preboreal）在11，530至11，500 calBP之间扩张。在弗里斯兰阶段之后，可以推断出两个明显的气候变化：（1）大约11，430 -11，350 calBP，白桦林的扩张被一个干燥的大陆阶段所打断，该阶段为开阔的草原植被，即Rammelbeek阶段。这一阶段与格陵兰冰芯δ 18 O记录中观测到的北半球前涛动（PBO）的最冷部分是同时期的，并被归因于导致北大西洋温盐环流暂时减少的大融水通量。(2)在前寒武纪晚期开始时，即11，270至11，210 calBP之间，气候突然转向更加湿润，桦树林再次扩张。宇宙成因核素14 C和10 Be的同时增加表明，气候和植被的这些变化是由太阳活动的突然下降造成的。松树的扩张发生在前寒武纪晚期。在北极光开始时，在10，770到10，700 calBP之间，荷兰开始发展出浓密的林地，有榛树、橡树、榆树和松树。
In order to compare environmental and inferred climatic change during the Preboreal in The Netherlands, five terrestrial records were analysed. Detailed multi-proxy analyses including microfossils (e.g., pollen, spores, algae, and fungal spores), macroremains (e.g., seeds, fruits, wood, mosses, etc.), and loss on ignition measurements were carried out with high temporal resolution. To link the five Preboreal records, accurate chronologies were produced by AMS14C wiggle-match dating. The Dutch records show that following the Lateglacial/Holocene climate warming, birch woodlands expanded between 11,530 and 11,500calBP during the Friesland Phase of the Preboreal. After the Friesland Phase, two distinct climatic shifts could be inferred: (1) around 11,430–11,350calBP the expansion of birch forests was interrupted by a dry continental phase with open grassland vegetation, the Rammelbeek Phase. This phase was coeval with the coldest part of the Preboreal oscillation (PBO) as observed in the δ18O record of the Greenland ice-core records and has been attributed to a large meltwater flux that resulted in a temporary decrease of the thermohaline circulation in the North Atlantic. (2) At the start of the Late Preboreal, between 11,270 and 11,210calBP, a sudden shift to a more humid climate occurred and birch forests expanded again. A simultaneous increase in the cosmogenic nuclides14C and10Be suggests that these changes in climate and vegetation were forced by a sudden decline in solar activity. Expansion of pine occurred during the later part of the Late Preboreal. At the onset of the Boreal, between 10,770 and 10,700calBP, dense woodlands with hazel, oak, elm and pine started to develop in The Netherlands.