Abstract
The efficacy of vegetation dynamics simulations in offline land surface models (LSMs) largely depends on the quality and spatial resolution of meteorological forcing data. In this study, the Princeton Global Meteorological Forcing Data (PMFD) and the high spatial resolution and upscaled China Meteorological Forcing Data (CMFD) were used to drive the Simplified Simple Biosphere model version 4/Top-down Representation of Interactive Foliage and Flora Including Dynamics (SSiB4/TRIFFID) and investigate how meteorological forcing datasets with different spatial resolutions affect simulations over the Tibetan Plateau (TP), a region with complex topography and sparse observations. By comparing the monthly Leaf Area Index (LAI) and Gross Primary Production (GPP) against observations, we found that SSiB4/TRIFFID driven by upscaled CMFD improved the performance in simulating the spatial distributions of LAI and GPP over the TP, reducing RMSEs by 24.3% and 20.5%, respectively. The multi-year averaged GPP decreased from 364.68 gC m–2 yr–1 to 241.21 gC m–2 yr–1 with the percentage bias dropping from 50.2% to –1.7%. When using the high spatial resolution CMFD, the RMSEs of the spatial distributions of LAI and GPP simulations were further reduced by 7.5% and 9.5%, respectively. This study highlights the importance of more realistic and high-resolution forcing data in simulating vegetation growth and carbon exchange between the atmosphere and biosphere over the TP.
摘要
陆面模式中植被动态的模拟效果与大气驱动数据的准确性以及模式空间分辨率密切相关, 特别是在地形复杂、 观测资料稀少的青藏高原地区, 模式的模拟效果对不同的大气驱动数据和空间分辨率更加敏感. 本研究分别使用普林斯顿全球大气驱动数据(PMFD)和中国区域高分辨率气象驱动数据集(CMFD)驱动耦合了动态植被过程的陆面模式SSiB4/TRIFFID, 探究不同的大气驱动数据和空间分辨率对青藏高原植被动态模拟的影响. 通过比较模拟和观测的月平均叶面积指数(LAI)和总初级生产力(GPP), 发现相较于使用PMFD气象驱动数据的模式模拟结果, CMFD气象驱动数据显著提高了模式对于青藏高原地区LAI和GPP空间分布的模拟能力, 均方根误差(RMSE)分别降低了24.3%和20.5%. 研究发现, CMFD气象驱动数据对GPP的模拟改进尤其明显, 年平均GPP从364.68 gC m-2 yr-1下降到241.21 gC m-2 yr-1, 模拟偏差从50.2%下降到-1.7%. 当使用更高分辨率的CMFD驱动SSiB4/TRIFFID时, 模拟的LAI和GPP空间分布 的RMSE分别进一步降低了7.5%和9.5%. 本研究强调了利用更真实和更高分辨率的大气驱动场在模拟青藏高原植被生长以及陆地生态系统碳通量中的重要作用.
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Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 42130602, 42175136) and the Collaborative Innovation Center for Climate Change, Jiangsu Province, China. The authors thank the Terrestrial Hydrology Research Group, Princeton University, for providing the Global Meteorological Forcing Dataset, which can be found at http://hydrology.princeton.edu/data/pgf/1.0degree/3hourly/. The authors acknowledge the Big Earth Data Platform for Three Poles for providing the China Meteorological Forcing Dataset (1979–2018) and plant functional types map in China.
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• Vegetation dynamics over the Tibetan Plateau (TP) were simulated and analyzed with a dynamic vegetation model.
• Atmospheric forcing data significantly affected the simulations of Leaf Area Index (LAI) and Gross Primary Production (GPP) over the TP.
• China Meteorological Forcing Data (CMFD) largely improved vegetation growth and carbon exchange simulations over the TP.
This paper is a contribution to the special issue on Third Pole Atmospheric Physics, Chemistry, and Hydrology.
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Improving Simulations of Vegetation Dynamics over the Tibetan Plateau: Role of Atmospheric Forcing Data and Spatial Resolution
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Kang, Z., Qiu, B., Xiang, Z. et al. Improving Simulations of Vegetation Dynamics over the Tibetan Plateau: Role of Atmospheric Forcing Data and Spatial Resolution. Adv. Atmos. Sci. 39, 1115–1132 (2022). https://doi.org/10.1007/s00376-022-1426-6
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DOI: https://doi.org/10.1007/s00376-022-1426-6