Surface flux equilibrium estimates of evaporative fraction and evapotranspiration at global scale: Accuracy evaluation and performance comparison
文献类型：期刊论文
| 作者 | Zhu, Wenbin1,2; Yu, Xiaoyu2; Wei, Jiaxing3; Lv, Aifeng2 |
| 刊名 | AGRICULTURAL WATER MANAGEMENT
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 291页码:15 |
| 关键词 | Global evapotranspiration Evaporative fraction Surface flux equilibrium Accuracy evaluation Model comparison |
| ISSN号 | 0378-3774 |
| DOI | 10.1016/j.agwat.2023.108609 |
| 通讯作者 | Zhu, Wenbin(zhuwb@igsnrr.ac.cn) ; Lv, Aifeng(lvaf@163.com) |
| 英文摘要 | Accurate estimation of terrestrial evapotranspiration (ET) is crucial to understand the water cycle and partitioning of turbulent energy fluxes at the land surface. However, large-scale ET estimation is always difficult to achieve due to the complexity of controlling factors and the heterogeneity of landscapes. A recent model, referred to as the surface flux equilibrium (SFE) model, proposes that evaporative fraction (EF, the ratio of ET to available energy at the surface) can be estimated accurately from near-surface specific humidity and air temperature, which makes it applicable to common weather stations and climate reanalysis datasets. However, previous validation only focused on the evaluation of this model at site and basin scale for ET estimation, making the real performance of the SFE model for EF estimation heretofore unknown. There also exists a gap in the comparison between the SFE model and other existing products in the representation of global ET patterns and variation trend. Against this background, a comprehensive validation was performed in this study to evaluate the accuracy of the SFE model for both EF and ET estimation. The validation against 136 flux towers worldwide shows that the ground-based SFE model achieved EF estimation with a root-mean-square-error (RMSE) of 0.22 and 0.16 at daily and monthly scale, respectively. The corresponding RMSE of ET estimation was 0.94 mm/day and 16.37 mm/month. The application of the SFE model on a global scale was achieved by using two reanalysis products (ERA5-Land and GLDAS-CLSM) as inputs respectively. The results indicate that the SFE model did hold potential to reduce the RMSE of these two products for ET estimation, but the cost was the decrease in correlation coefficient (r). The comparison with five existing global ET products (BESS, GLEAM, AVHRR, MOD16, and SSEBop) shows that the SFE model performed on the basis of ERA5-Land product has achieved moderate accuracy among these products. Judged from r, mean absolute error, RMSE, and bias, its accuracy was ranked as fourth, fourth, second, and second, respectively. However, a further evaluation over different land cover types suggests that the ERA-based SFE model has significant superiority over cropland, relative superiority over forest and savannas, and significant inferiority over shrubland and grassland. This analysis is the first global validation of the SFE model for EF estimation as well as its comparison with existing global ET products. The validation analysis proves that this simple model has generally achieved comparable accuracy to existing complex models in the representation of global ET patterns and variation trend. |
| WOS关键词 | RECENT DECLINE ; WATER ; PRODUCTS ; HUMIDITY ; UNCERTAINTY ; CARBON ; TEMPERATURE ; MODELS ; VAPOR ; MODIS |
| 资助项目 | National Key Research and Development Program of China[2021YFC3000201] ; National Natural Sciences Foundation of China[42071032] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2020056] |
| WOS研究方向 | Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001127835400001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Key Research and Development Program of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/201242]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhu, Wenbin; Lv, Aifeng |
| 作者单位 | 1.Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining, Qinghai, Peoples R China 2.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 3.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Wenbin,Yu, Xiaoyu,Wei, Jiaxing,et al. Surface flux equilibrium estimates of evaporative fraction and evapotranspiration at global scale: Accuracy evaluation and performance comparison[J]. AGRICULTURAL WATER MANAGEMENT,2024,291:15. |
| APA | Zhu, Wenbin,Yu, Xiaoyu,Wei, Jiaxing,&Lv, Aifeng.(2024).Surface flux equilibrium estimates of evaporative fraction and evapotranspiration at global scale: Accuracy evaluation and performance comparison.AGRICULTURAL WATER MANAGEMENT,291,15. |
| MLA | Zhu, Wenbin,et al."Surface flux equilibrium estimates of evaporative fraction and evapotranspiration at global scale: Accuracy evaluation and performance comparison".AGRICULTURAL WATER MANAGEMENT 291(2024):15. |
入库方式： OAI收割
来源：地理科学与资源研究所
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