Terrestrial Gross Carbon Dioxide Uptake: Global Distribution and Covariation with Climate
Terrestrial Gross Carbon Dioxide Uptake: Global Distribution and Covariation with Climate
复制标题
DOI：
10.1126/science.1184984
复制
发表时间：
2010-08-13
期刊：
影响因子：
56.9
通讯作者：
Papale, Dario
中科院分区：
文献类型：
--
作者：
Beer, Christian;Reichstein, Markus;Papale, Dario
陆地总初级生产力（GPP）是全球最大的二氧化碳通量，驱动着多种生态系统功能。我们利用涡度协方差通量数据和各种诊断模型，对这一通量进行了基于观测的估算，结果为每年123±8拍克碳（Pg C year⁻¹）。热带森林和热带稀树草原占60%。植被覆盖土地中超过40%的GPP与降水有关。用于气候预测的最先进的面向过程的生物圈模型在GPP纬度模式上表现出较大的模型间差异，并且显示GPP与降水之间具有更高的空间相关性，这表明存在缺失的过程或反馈机制，减弱了植被对气候的响应。我们对空间分布的GPP及其与气候的协变关系的估算有助于改进耦合的气候 - 碳循环过程模型。
Terrestrial gross primary production (GPP) is the largest global CO2 flux driving several ecosystem functions. We provide an observation-based estimate of this flux at 123 +/- 8 petagrams of carbon per year (Pg C year(-1)) using eddy covariance flux data and various diagnostic models. Tropical forests and savannahs account for 60%. GPP over 40% of the vegetated land is associated with precipitation. State-of-the-art process-oriented biosphere models used for climate predictions exhibit a large between-model variation of GPP's latitudinal patterns and show higher spatial correlations between GPP and precipitation, suggesting the existence of missing processes or feedback mechanisms which attenuate the vegetation response to climate. Our estimates of spatially distributed GPP and its covariation with climate can help improve coupled climate-carbon cycle process models.