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首页> 外文期刊>Estuarine Coastal and Shelf Science >Foraminiferal evidence of major environmental changes driven by the sun- climate coupling in the western Portuguese coast (14th century to present)
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Foraminiferal evidence of major environmental changes driven by the sun- climate coupling in the western Portuguese coast (14th century to present)

机译：有孔虫证据表明，葡萄牙西部沿海（14世纪至今）的太阳-气候耦合驱动了主要环境的变化

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摘要

New paleoclimatic data from the Casa Branca salt marsh, in the southwest coast of Portugal, are compared with records previously published on the northwest coast (Caminha salt marsh) to offer a more comprehensive overview of the environmental evolution of the west Iberian margin over the last six centuries. These reconstructions are based on the foraminiferal records of two dated sediment cores retrieved from the high marsh settings and supported by geochemical-sedimentological data.Both marshes were originally formed in the AD 1300s, between the Medieval Climatic Anomaly (MCA) and the Little Ice Age (LIA), highlighting a major episode of increased sediment supply in lower estuaries linked to climate-driven changes in continental runoff. Afterwards, the two marshes evolved under different climatic regimes as reflected by their foraminiferal assemblages. The environmental conditions are characterized by higher salinity in Casa Branca (southwest), with Jadammina macrescens and Trochammina inflata as dominant species, than in Caminha (northwest), where Haplophragmoides spp. dominates. We suggest that a long-term trend of a net gain in evapotranspiration at Casa Branca inducing a higher marsh salinity baseline may explain this microfaunal contrast. Trochammina inflata seems to be a good indicator of drier periods in the studied area, connected to key events of aeolian large-dust input to the southwest coast of Portugal. The influence of the most important climate drivers was assessed, namely external (solar) and internal (North Atlantic Oscillation - NAO) forcings.Spectral and wavelet transform coherence analyses were used to detect solar footprints on foraminiferal and climate-related time series. A main significant quasi-periodicity was identified within the range of the secular Gleissberg cycle of solar activity modulating the annual NAO and regional spring-summer (simulated) temperatures after AD 1700. This stronger solar-climate coupling may be related to the known upward secular trend in the total solar irradiance after the Maunder Minimum.
机译：将来自葡萄牙西南海岸的卡萨布兰卡盐沼的新古气候数据与先前在西北海岸发布的记录（卡米尼亚盐沼）进行了比较，以提供更全面的伊比利亚边缘西缘环境演变的概述。六个世纪。这些重建是基于从高沼泽地带取回的两个过时沉积物核心的有孔虫记录，并得到地球化学沉积学数据的支持。这两个沼泽地最初形成于公元1300年代，介于中世纪气候异常（MCA）和小冰河时期之间。 （LIA），突出显示了与气候驱动的大陆径流变化相关的河口下游沉积物供应增加的一个主要事件。之后，这两个沼泽在有孔虫的组合下反映出不同的气候条件。环境条件的特​​点是，卡萨布兰卡（西南）的盐度较高，贾达米娜macrescens和黄褐藻（Trochammina inflata）为优势种，而卡波尼亚（西北）的单倍体为盐度较高。占主导地位。我们建议，Casa Branca的蒸散量净增加的长期趋势导致较高的沼泽盐度基线可能解释了这种微动物的对比。 Trochammina inflata似乎是研究区域较干旱时期的良好指标，这与向葡萄牙西南海岸输入大风沙的关键事件有关。评估了最重要的气候驱动因素的影响，即外部（太阳）和内部（北大西洋涛动-NAO）强迫。使用光谱和小波变换相干分析来检测有孔虫和气候相关时间序列上的太阳足迹。在公元1700年以后的太阳活动的长期Gleissberg周期范围内，调节年NAO和区域春季-夏季（模拟）温度的长期活动中，确定了主要的准周期性。这种更强的太阳-气候耦合可能与已知的向上长期Maunder Minimum之后的总太阳辐照度的趋势。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2019年第5期|106-118|共13页
  • 作者

    Moreno J.; Fatela F.; Leorri E.; Moreno F.; Goncalves M. A.; Gomez-Navarro J. J.; Araujo M. F.; Freitas M. C.; Trigo R. M.; Blake W. H.;

  • 作者单位

    Univ Lisbon, IDL, P-1749016 Lisbon, Portugal;

    Univ Lisbon, IDL, P-1749016 Lisbon, Portugal|Univ Lisbon, Fac Ciencias, Dept Geol, P-1749016 Lisbon, Portugal;

    East Carolina Univ, Dept Geol Sci, Greenville, NC 27858 USA;

    Polo Univ Minho, ICT, Campus Gualtar, P-4710057 Braga, Portugal;

    Univ Lisbon, IDL, P-1749016 Lisbon, Portugal|Univ Lisbon, Fac Ciencias, Dept Geol, P-1749016 Lisbon, Portugal;

    Univ Murcia, Fac Chem, Dept Phys, Campus Espinardo, Murcia 30100, Spain;

    Univ Lisbon, Inst Super Tecn, C2TN, Estr Nacl 10 Ao Km 139,7, P-2695066 Bobadela, Lrs, Portugal;

    Univ Lisbon, IDL, P-1749016 Lisbon, Portugal|Univ Lisbon, Fac Ciencias, Dept Geol, P-1749016 Lisbon, Portugal;

    Univ Lisbon, Fac Ciencias, DEGGE, P-1749016 Lisbon, Portugal;

    Plymouth Univ, Sch Geog Earth & Environm Sci, Plymouth PL4 8AA, Devon, England;

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  • 正文语种 eng
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  • 关键词

    Southwest Europe; Marsh hydrological balance; Dust events; Little Ice Age; Gleissberg cycle;

    机译：西南欧洲;沼泽水文平衡;沙尘事件;小冰期;格莱斯伯格循环;

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