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Monitoring biosphere vegetation 1998-2009

机译:1998-2009年监测生物圈植被

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Earth Observation from space offers the opportunity to produce time-series of geophysical products that can be used to assess the state and changes of land surfaces. The Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) is used to monitor the state and evolution of terrestrial vegetation, and also constitutes a state variable in advanced Earth system models that contain a detailed enough description of the terrestrial biosphere. This present study reports a 12-year (1998-2009) time series of FAPAR derived from the combination of two satellite-based sensors. We find that FAPAR exhibits large-scale inter-annual variations and multi-year trends. The fraction of land grid cells showing positive anomalies, as computed by the deviation from the 12-year climatology, shows a rapid decrease in the early part of the analysis period (until 2004). Large negative anomalies can be associated with previously reported large-scale climate events, such as global land drying associated with El Nio Southern Oscillation 2000-2003, or the European drought of 2003 or recent Australian droughts The present analysis demonstrates that FAPAR is an important global variable suitable for large-scale monitoring of climate impacts on the terrestrial biosphere.
机译:从太空进行地球观测可提供产生时间序列的地球物理产品的机会,这些时间序列可用于评估陆地表面的状态和变化。吸收的光合有效辐射分数(FAPAR)用于监视陆地植被的状态和演变,并且在高级地球系统模型中也构成状态变量,该模型包含对陆地生物圈的足够详细的描述。本研究报告了FAPAR的12年(1998-2009)时间序列,该时间序列是由两个基于卫星的传感器的组合得出的。我们发现FAPAR呈现出大规模的年度间变化和多年趋势。根据与12年气候变化的偏差计算,显示出正异常的陆地网格单元所占的比例在分析期的早期(直到2004年)迅速减少。较大的负异常可能与先前报道的大规模气候事件有关,例如与2000-2003年厄尔尼诺南方涛动相关的全球土地干燥,或2003年的欧洲干旱或最近的澳大利亚干旱。本分析表明,FAPAR是重要的全球气候变化事件。该变量适用于大规模监测气候对陆地生物圈的影响。

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