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大气科学  2008 

年际时间尺度上全球植被与大气相互作用的诊断分析

DOI: 10.3878/j.issn.1006-9895.2008.01.07

Keywords: 年际变化,植被-大气相互作用,时滞相关,反馈

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Abstract:

利用NOAAAVHRR得到的19年(1982~2000)全球月平均的叶面积指数(LAI)与ERA40近地面气温和CMAP降水进行时滞相关分析,并研究了LAI的年际变化对后期温度、降水的反馈作用。结果表明,大部分地区LAI与同期气温的相关性更好,30°N以北(以南)基本上为正(负)相关。LAI滞后一个月时,北半球中低纬度和20°S以南大部地区LAI与降水的正相关更强;而在北半球中纬度大陆东部和南半球热带地区,LAI与前一个月温度的关系更密切。LAI与温度的相关性在春、秋季最明显,LAI与降水的关系在雨季最密切。LAI对气温比较显著的正反馈主要分布在北半球中高纬度地区;20°S以南大部地区为比较显著的负反馈。LAI对降水比较显著的正反馈分散在北美大陆西北部、东欧平原南部、欧亚大陆东北部和热带沿海地区。中高纬度(尤其是北半球)大部分地区LAI对气温、降水反馈部分的解释方差达到总方差的20%以上。

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