## 5 Conclusions  
In this study, four high spatial resolution ET products (MOD16, PML-V2, BESS, and GLASS) were assessed and compared over LMRB, based on eddy covariance evaluation, spatiotemporal inter-comparison, and literature comparison. Results obtained reveal that MOD16 does not perform well as compared to the other three ET products. No significant differences are found among the other three products. The performance of each product varies across the different vegetation types, even within the same climate zone. In addition, the four ET products show neither a consistent temporal trend nor a uniform spatial distribution. The inconsistent performance of the four ET products over LMRB may be due to various reasons, including model inputs, model algorithms and assessment methods. In order to achieve more precise management of water resources, it is necessary to provide input data with high temporal and spatial consistency, and to optimize the estimation algorithm to improve the accuracy of ET products over LMRB.  
Conceptualization, H.C. and Y.C.; data curation, H.C., P.G., A.S. and G.F.; formal analysis, H.C., P.G., L.R.M. and Y.C.; funding acquisition, Y.C.; investigation, H.C.; methodology, Y.C.; project administration, Q.S. and Y.C.; resources, P.G., Q.S. and C.S.; software, H.C.; supervision, Q.S. and Y.C.; validation, H.C., A.S. and G.F.; visualization, P.G. and K.L.; writing--original draft,H.C. and L.R.M.; writing--review & editing, P.G., L.R.M., Y.C. and K.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China, grant number 41901124.  
The eddy covariance data used in this study come from different sources. The EC dataset of two sites (SKR and MKL) was obtained from the ASIAFLux ([[http://asiafulux.net/](http://asiafulux.net/)]([http://asiafulux.net/](http://asiafulux.net/)) (accessed on 18 May 2021)). The EC dataset of four sites (prt007, ct007, pst007 and dtt030) was obtained from FluxPro ([[http://www.naro.afrc.go.jp/org/niaes/amen/](http://www.naro.afrc.go.jp/org/niaes/amen/)]([http://www.naro.afrc.go.jp/org/niaes/amen/](http://www.naro.afrc.go.jp/org/niaes/amen/)) (accessed on 16 June 2021)). The EC dataset of four sites (Yuanjiang, XSBNRa, Ailaoshan, and XSBNRa) was obtained from [[http://csdata.org/](http://csdata.org/)]([http://csdata.org/](http://csdata.org/)) (accessed on 10 June 2021). Notably, the EC dataset of QZ-SETORS is not available to the public. The four ET products were also downloaded from different websites. MOD16 was downloaded from [[https://modis.gsfc.nasa.gov/data/dataprod/mod16.php](https://modis.gsfc.nasa.gov/data/dataprod/mod16.php)]([https://modis.gsfc.nasa.gov/data/dataprod/mod16.php](https://modis.gsfc.nasa.gov/data/dataprod/mod16.php)) (accessed on 26 October 2020); PML-V2 was downloaded from [[https://developers.google.com/earth-engine/](https://developers.google.com/earth-engine/)]([https://developers.google.com/earth-engine/](https://developers.google.com/earth-engine/)) (accessed on 10 December 2020); GLASS was downloaded from [[http://www.geodata.cn/](http://www.geodata.cn/)]([http://www.geodata.cn/](http://www.geodata.cn/)) (accessed on 23 March 2021); BESS was downloaded from [[http://environment.snu.ac.kr/](http://environment.snu.ac.kr/)]([http://environment.snu.ac.kr/](http://environment.snu.ac.kr/)) (accessed on 16 December 2020). The land cover product was downloaded from [[https://lpdaac.usgs.gov/products/mcd12q1v006/](https://lpdaac.usgs.gov/products/mcd12q1v006/)]([https://lpdaac.usgs.gov/products/mcd12q1v006/](https://lpdaac.usgs.gov/products/mcd12q1v006/)) (accessed on 26 October 2020).  
Thank you for the comments of the three anonymous review experts and editors.  
The authors declare no conflict of interest.