TY  - Data
T1  - Improved estimate of global gross primary production for reproducing its long-term variation, 1982–2017
A1  - None
DO  - 10.6084/m9.figshare.8942336.v3
PY  - 2023
DA  - 2023-11-27
PB  - National Cryosphere Desert Data Center
AB  - This dataset generated global long-term GPP data with a latitude of 0.05∘, a longitude of 0.05∘, and a time interval of 8 days by revising the light utilization efficiency model (i.e. EC-LUE model). In the revised EC-LUE model, several major environmental variables were integrated: atmospheric carbon dioxide concentration, radiation composition, and atmospheric water vapor pressure difference (VPD). The long-term changes in these environmental variables may have a significant impact on global vegetation productivity. The vorticity covariance (EC) measurement data from 95 tall towers from the FLUXNET2015 dataset were used to calibrate and validate the model, covering nine major ecosystem types worldwide. The revised EC-LUE model can explain 71% of the annual GPP spatial changes among 95 observation points. At over 95% of observation points, the correlation coefficient (R2) between tower estimation and model simulation of GPP seasonal variation is greater than 0.5. Among all 55 stations with observation years exceeding 5 years, the average annual GPP simulated by the tower estimation and model was 0.44, significantly higher than the original EC-LUE model (R2=0.36) and other LUE models (R2ranging from 0.06 to 0.30, with an average value of 0.16). On a global scale, there are significant differences in the size and interannual variations of GPP obtained from light utilization efficiency models, machine learning models, and process based biophysical models. The revised EC-LUE model quantifies the global average GPP from 1982 to 2017 as 106.2 ± 2.9 Pg C yr-1, with a trend of 0.15 Pg C yr-1. Sensitivity analysis shows that the GPP simulated by the EC-LUE model is sensitive to atmospheric CO2concentration, VPD, and radiation. During the period from 1982 to 2017, the increase in VPD (Pg C yr-1) partially offset the impact of CO2fertilization on global GPP (0.22 ± 0.07 Pg C yr-1). The long-term changes in environmental variables can be well reflected in the global GPP. Overal
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/d3103e98-6c2d-4733-a662-506d07493c65
ER  -