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Interannual lake fluctuations in the Argentine Puna: relationships with its associated peatlands and climate change

机译：阿根廷普纳的际湖波动：与其相关的泥炭地和气候变化的关系

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摘要

High elevation ecosystems are likely more sensitive to climate change. But, due to paucity of instrumental records, such effects are poorly studied, particularly in mountains outside Europe and North America. Here, we quantified water body area fluctuations for the last 32years in 15 lakes spread over an area of 14.3 million ha in the Argentine Puna, through the classification of Landsat images; and we quantified peatlands NDVI (a proxy of vegetation productivity) from MODIS images. We evaluated the pairwise similarity between lakes interannual fluctuations and their relationship with climate models (TRMM 3B43 v7; CRU TS 4.10) and potential controls (ENSO index); and the correlations between water body area and the NDVI variation of its associated peatlands. Lakes were grouped in two clusters defined by their synchronic water body area variability and these clusters define two main geographic zones: NE and SW. Consistent with previous observations of an overall aridization trend, water body area generally decreased but showed large variability among lakes. Peatlands productivity was more correlated with lake variability than with modeled precipitation, and lake water body area was weakly related to indices of ENSO, providing an additional tool to relate local climate with continental and global climate models. The analysis shows that lake behavior is highly variable spatially and temporally, and that satellite-based monitoring is a valuable tool for assessing ecological conditions of wetlands in the region, characterized by the lack of climatic instrumental records; and to explore the vulnerability of wetlands to climate change.
机译：高海拔生态系统对气候变化可能更敏感。但是，由于缺乏工具记录，这种影响很差，特别是在欧洲和北美以外的山区。在这里，我们通过Landsat图像的分类，我们在15次湖泊的最后32年的水体积波动在15次湖泊中传播了1430万公顷的范围;我们从MODIS图像量化了泥炭块NDVI（植被生产率的代理）。我们评估了湖泊之间的一对相似性及其与气候模型的关系（TRMM 3B43 V7; CRU TS 4.10）和潜在控制（ENSO指数）;水体区与其相关泥炭块的NDVI变化之间的相关性。湖泊被分组在由它们的同步水体积变异性定义的两种簇中，这些集群定义了两个主要地理区域：NE和SW。与先前的整体曝光趋势的观察结果一致，水体积普遍下降，但湖泊之间存在巨大变化。 Peatlands生产率与湖泊可变性更相关，而不是模型降水，水湖体积与enso索引弱相关，提供了一个额外的工具，使当地气候与大陆和全球气候模型相关。分析表明，湖泊行为在空间和时间上是高度变化的，并且基于卫星的监测是评估该地区湿地生态条件的有价值的工具，其特征在于缺乏气候工具记录;并探讨湿地对气候变化的脆弱性。

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  • 来源
    《Regional Environmental Change》 |2019年第6期|1737-1750|共14页
  • 作者

    Casagranda Elvira; Navarro Carlos; Grau H. Ricardo; Izquierdo Andrea E.;

  • 作者单位

    Univ Nacl Tucuman Inst Ecol Reg CC 34 RA-4107 Yerba Buena Tucuman Argentina|Univ Nacl Tucuman CONICET CC 34 RA-4107 Yerba Buena Tucuman Argentina;

    Univ Nacl Tucuman Inst Ecol Reg CC 34 RA-4107 Yerba Buena Tucuman Argentina|Univ Nacl Tucuman CONICET CC 34 RA-4107 Yerba Buena Tucuman Argentina;

    Univ Nacl Tucuman Inst Ecol Reg CC 34 RA-4107 Yerba Buena Tucuman Argentina|Univ Nacl Tucuman CONICET CC 34 RA-4107 Yerba Buena Tucuman Argentina;

    Univ Nacl Tucuman Inst Ecol Reg CC 34 RA-4107 Yerba Buena Tucuman Argentina|Univ Nacl Tucuman CONICET CC 34 RA-4107 Yerba Buena Tucuman Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Puna; Lake; Water body area; Aridization; Peatlands; ENSO; Climate change;

    机译：普纳;湖;水体积;充气;泥炭块;enso;气候变化;

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