## 3 Results
### Performance Based on Literature Comparison  
Figure 8 shows the results of the multi-year average ET comparison from different climate zones between the four products, and the ET values from the literature in other regions. In the equatorial climate zone, the multi-year average ET of evergreen broadleaf forests, with the four products, ranges from 1000 mm to 1400 mm, with a mean value of 1226.90 mm, which is comparable to the ET of the same climate from the literature (Figure 8a). However, the ET discrepancy between the products and the literature is larger in shrubs and croplands (Figure 8a). Specifically, the multi-year average ET (1127.23 mm) of the four products is much higher than that from the literature with a similar climate (802.86 mm) in shrubs, while it is much lower than that from the literature in croplands. This is reasonable, as croplands are more easily affected by human activities, and shrubs are more diverse in density compared to evergreen broadleaf forests. Thus, the multi-year average ET of evergreen broadleaf forests is more stable than that of shrubs and croplands in the same equatorial climate zone.  
In the warm climate zone, the multi-year average ET of deciduous broadleaf forests (721.16 mm) and needleleaf forests (751.09 mm), with the four products, is also comparable to corresponding ET from the literature (Figure 8b). Similarly to the equatorial climate zone, the ET discrepancy between the products and the literature is also larger in croplands (Figure 8b). The multi-year average ET from the four products can be as much as 240.84 mm lower than ET from the literature over croplands. A great gap between ET from the products and ET from the literature can also be found in grasslands in the warm climate zone (Figure 8b). Specifically, the multi-year average ET from the products is around 290.76 mm higher than that from the literature in grasslands. The discrepancy between ET from the products and ET from the literature on croplands and grasslands in the warm climate zone may be explained by their disturbance differences due to human activities, such as irrigation and grazing in different regions. It is worth noting that the ET of croplands in the warm climate zone is lower than that in the equatorial climate zone regardless of the products and the literature. This ET difference is largely attributable to climate differences.  
Figure 7: (**a**) Multi-year average ET of evergreen broadleaf forest (**a1**), deciduous broadleaf forests (**a2**), needleleaf forests (**a3**), shrubs (**a4**), croplands (**a5**), and grasslands (**a6**) over LMRB; (**b**) interannual variation of the four products and trend of MOD16, PML-V2, and the average ET during 2001–2015.  
In the snow and polar climate zone, ET from the products for all three land cover types (needleleaf forests, mixed forests and grasslands) is comparable to their corresponding ET from the literature (Figure 8c). This is because there is basically no human activity in this kind of cold climate region. The multi-year average ET of needleleaf forests is around 500 mm for all four products and the literature, which is comparable to that of mixed forest and grasslands in this region. It should be also noted that the annual average ET of needle leaf forests and grasslands in this cold climate region is much smaller than their corresponding annual average ET in the warm climate zone.