Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49°S) since 1300 CE

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Fernanda Charqueño-Celis, Nathalie Dubois, Bernd Zolitschka, Liseth Pérez, Christoph Mayr, Julieta Massaferro
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Abstract

Patagonia is a unique area for climate studies, exposed to the strong Southern Hemisphere Westerly Winds (SWW) and modulated by the Southern Annular Mode (SAM). Patagonia is also affected by volcanic eruptions of the Andean Mountain Range, and is rich in lacustrine environments, which are ideal for paleocological and paleoclimatological reconstructions. Sediments of Patagonian lakes provide an excellent opportunity to study the responses of aquatic communities to major climatic and environmental events in still pristine freshwater ecosystems. Here, we present a high-resolution paleolimnological reconstruction using testate amoebae and chironomid assemblages and compare it with organic and inorganic sediment geochemistry (Ca, K, Ti, N, TOC, TOC/N, δ15N, δ13C) from a sediment core of Laguna Polo (49°S, Santa Cruz, Argentina) covering the last ca. 1300 years. Our results imply a warm-dry and productive environment from around 1300–1400 CE, a cold and less productive environment from ca. 1400–1700 CE, broadly corresponding to the Little Ice Age (LIA). The latter period is followed by high volcanic activity between ca. 1700 and 1960 CE. The tephra layers are known from other records in the vicinity and are preliminarily attributed to the eruptions of the adjacent Lautaro Volcano. A warm-stenothermic chironomid assemblage indicates a progressive increase in temperature in the most recent time after the last eruption, attributed to Lautaro Volcano in 1960 CE.

Abstract Image

巴塔哥尼亚南部圣克鲁斯波罗湖(南纬 49 度)自公元 1300 年以来的气候和环境历史
巴塔哥尼亚是一个独特的气候研究地区,这里受到强烈的南半球西风(SWW)的影响,并受到南环流模式(SAM)的调节。巴塔哥尼亚还受到安第斯山脉火山爆发的影响,拥有丰富的湖泊环境,是古生态学和古气候学重建的理想之地。巴塔哥尼亚湖泊的沉积物为研究水生生物群落在仍然原始的淡水生态系统中对重大气候和环境事件的反应提供了绝佳的机会。在此,我们利用睾丸变形虫和摇蚊的组合进行了高分辨率的古气候学重建,并将其与波罗湖(阿根廷圣克鲁斯,南纬 49°)沉积物岩芯中的有机和无机沉积物地球化学(Ca、K、Ti、N、TOC、TOC/N、δ15N、δ13C)进行了比较,结果涵盖了过去约 1300 年的时间。1300 年。我们的研究结果表明,公元前 1300-1400 年左右是一个温暖干燥、高产的环境,公元前 1400-1700 年左右是一个寒冷、低产的环境,大致相当于小冰河时期(LIA)。在小冰河时期之后,约公元 1700 年至 1960 年间火山活动频繁。从附近的其他记录中可以了解到这些火山碎屑层,初步认为是邻近的劳塔罗火山喷发造成的。一个暖-恒温摇蚊集合体表明,在上次火山爆发(公元 1960 年劳塔罗火山爆发)后的最近一段时间内,温度逐渐升高。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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