Towards a General Monitoring System for Terrestrial Primary Production: A Test Spanning the European Drought of 2018
Towards a General Monitoring System for Terrestrial Primary Production: A Test Spanning the European Drought of 2018
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DOI：
10.3390/rs15061693
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
K. Bloomfield;Roel Van Hoolst;M. Balzarolo;I. Janssens;S. Vicca;D. Ghent;I. Prentice
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文献类型：
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作者：
K. Bloomfield;Roel Van Hoolst;M. Balzarolo;I. Janssens;S. Vicca;D. Ghent;I. Prentice
(1)陆面模型需要输入温度和湿度变量，以生成初级生产总值（GPP）的预测。叶温和气温之间的差异在时间和空间上各不相同，在土壤水分含量低的条件下可能特别明显。哨兵-3号卫星使命提供了对地表温度的估计，对于植被像素，可将其作为冠层温度。遥感估计LST提供一个简约的输入模型结合信息的叶温和水化？(2)使用光利用效率模型，只需要少数的输入变量，我们生成的GPP模拟与涡动协方差推断的估计通量的综合碳观测系统内的网站进行比较。遥感LST和绿度数据是从哨兵-3号输入的。网格气温数据来自欧洲中期天气预报中心。我们选择了2018-2019年来利用明显的欧洲干旱的自然实验。(3)模拟GPP表现出良好的协议与通量推导的估计。在干燥条件下，模拟强迫LST表现优于那些与空气温度的灌丛，草地和稀树草原网站。(4)这项研究提出了主要依靠遥感输入的全球行星伙伴关系监测系统的前景。
(1) Land surface models require inputs of temperature and moisture variables to generate predictions of gross primary production (GPP). Differences between leaf and air temperature vary temporally and spatially and may be especially pronounced under conditions of low soil moisture availability. The Sentinel-3 satellite mission offers estimates of the land surface temperature (LST), which for vegetated pixels can be adopted as the canopy temperature. Could remotely sensed estimates of LST offer a parsimonious input to models by combining information on leaf temperature and hydration? (2) Using a light use efficiency model that requires only a handful of input variables, we generated GPP simulations for comparison with eddy-covariance inferred estimates available from flux sites within the Integrated Carbon Observation System. Remotely sensed LST and greenness data were input from Sentinel-3. Gridded air temperature data were obtained from the European Centre for Medium-Range Weather Forecasts. We chose the years 2018–2019 to exploit the natural experiment of a pronounced European drought. (3) Simulated GPP showed good agreement with flux-derived estimates. During dry conditions, simulations forced with LST performed better than those with air temperature for shrubland, grassland and savanna sites. (4) This study advances the prospect for a global GPP monitoring system that will rely primarily on remotely sensed inputs.