Windthrow Variability in Central Amazonia
Windthrow Variability in Central Amazonia
复制标题
亚马逊中部的风投变化
DOI：
10.3390/atmos8020028
复制
发表时间：
2017
影响因子：
3.8
通讯作者：
N. Higuchi
中科院分区：
文献类型：
--
作者：
R. Negrón‐Juárez;H. Jenkins;C. Raupp;W. Riley;L. Kueppers;D. Marra;G. H. P. M. Ribeiro;Maria Terezinha F. Monteiro;Luis A. Candido;J. Chambers;N. Higuchi
© 2017作者。在亚马逊河流域，风蚀是一种经常性的干扰，是森林动态和碳储存的重要驱动力。在这项研究中，我们首次提出的季节性和年际变化的风，集中在亚马逊河流域中部，并讨论了潜在的气象因素与这种变化。1998-2010年期间的陆地卫星图像被用于探测风卷的发生，风卷是根据其光谱特征和形状确定的。在这里，我们发现，每年都会发生风灾，但在9月至2月之间更频繁。与嵌入中尺度对流系统的多单体风暴相关的有组织的对流活动，如偏北的飑线（从东北向西南移动）和偏南的飑线（从西南向东北移动），都可能导致大风。我们还发现，偏南的飑线发生的频率比以前报告的约50年的间隔。在年际尺度上，我们没有发现厄尔尼诺-南方涛动（ENSO）和风灾之间的联系。
© 2017 by the author. Windthrows are a recurrent disturbance in Amazonia and are an important driver of forest dynamics and carbon storage. In this study, we present for the first time the seasonal and interannual variability of windthrows, focusing on Central Amazonia, and discuss the potential meteorological factors associated with this variability. Landsat images over the 1998-2010 time period were used to detect the occurrence of windthrows, which were identified based on their spectral characteristics and shape. Here, we found that windthrows occurred every year but were more frequent between September and February. Organized convective activity associated with multicell storms embedded in mesoscale convective systems, such as northerly squall lines (that move from northeast to southwest) and southerly squall lines (that move from southwest to northeast) can cause windthrows. We also found that southerly squall lines occurred more frequently than their previously reported ~50 year interval. At the interannual scale, we did not find an association between El Nino-Southern Oscillation (ENSO) and windthrows.