<trans-title>Verification and comparison of three high-resolution surface evapotranspiration products in North China</trans-title>

Shaoyang HE; Jing TIAN; Yongqiang ZHANG

doi:10.18402/resci.2020.10.19

Resources Science, Volume. 42, Issue 10, 2035(2020)

Verification and comparison of three high-resolution surface evapotranspiration products in North China

Shaoyang HE1...2, Jing TIAN1,* and Yongqiang ZHANG1 |Show fewer author(s)

¹Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(13)

Fig. 1. Geomorphological map (a) and land use type and locations of five flux stations (b) on the North China Plain

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Fig. 2. Comparison of the simulated daily evapotranspiration (ET) and eddy covariance measurements from the 5 flux stations

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Fig. 3. Seasonal variations of the simulated evapotranspiration (ET) and site observations

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Fig. 4. Mean annual evapotranspiration (ET) spatial distribution estimated for the three products, 2003-2018

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Fig. 5. Annual variations of estimated evapotranspiration (ET) of cropland, forest land, and grassland of the three products, 2003-2018

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Fig. 6. Pixel level R distribution of the estimated evapotranspiration (ET) of the three products, 2003-2018

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Fig. 7. Root mean square error (RMSE) distribution of the estimated evapotranspiration (ET) of the three products, 2003-2018

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Table 1. Three evapotranspiration products with high resolution

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Table 1. Three evapotranspiration products with high resolution

产品名称	时间跨度	时间分辨率/天	空间分辨率/m	方法原理
PML_V2	2002.7—2019.9	8	500	基于Penman-Monteith公式和光合速率-气孔导度模型计算而得
MOD16A2	2001.1—现在	8	500	基于Penman-Monteith公式和Jarvis气孔导度模型计算而得
SSEBop_V4	2003.1—现在	10	1000	基于简化的地表能量平衡（SSEB）方法对每个像素使用了预定义的“热”和“冷”边界条件估算蒸散发

Table 2. Five flux stations on the North China Plain

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Table 2. Five flux stations on the North China Plain

站点名称	站点简称	所在县(区、市)	经度/°E	纬度/°N	海拔/m	观测时间
大兴站	DX	北京市大兴区	116.43	39.62	20	2008年1月1日—2010年12月27日
密云站	MY	北京市密云区	117.32	40.63	350	2008年1月1日—2010年12月29日
怀来站	HL	河北省怀来县	115.79	40.35	480	2013年1月1日—2017年12月31日
馆陶站	GT	河北省馆陶县	115.13	36.52	30	2008年1月1日—2010年12月31日
禹城站	YC	山东省禹城市	116.57	36.82	28	2008年1月1日—2010年12月31日

Table 3. Reclassification method for the land cover data of MCD12Q1

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Table 3. Reclassification method for the land cover data of MCD12Q1

重归类的土地覆盖类型	包含的IGBP土地覆盖类型	对应的IGBP编码
林地	常绿阔叶林、落叶针叶林、落叶阔叶林、针阔混交林、郁闭灌丛、稀疏灌丛	1、2、3、4、5、6、7
草地	木本稀树草原、稀树草原、草地	8、9、10
耕地	耕地、耕地和天然植被混合体	12、14
建设用地	城市和建成区	13
水域	水域	17
其他用地	永久湿地、永久冰雪、裸地和低植被覆盖区	11、15、16

Table 4. Accuracy evaluation of the simulated daily evapotranspiration (ET) at the five flux stations

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Table 4. Accuracy evaluation of the simulated daily evapotranspiration (ET) at the five flux stations

站点名称	PML_V2			MOD16A2			SSEBop_V4
站点名称	R	RMSE/(mm/d)	Bias/%	R	RMSE/(mm/d)	Bias/%	R	RMSE/(mm/d)	Bias/%
大兴站	0.80	1.08	-24.22	0.51	1.92	-57.71	0.73	1.19	-8.15
馆陶站	0.91	0.61	12.08	0.56	1.24	-33.04	0.90	1.14	26.21
怀来站	0.80	0.91	0.68	0.55	1.29	-14.45	0.75	2.27	114.76
密云站	0.95	0.49	-12.32	0.90	0.81	-24.81	0.88	0.77	-0.01
禹城站	0.77	0.98	-5.50	0.20	3.40	-65.87	0.83	1.29	29.55

Table 5. Comparison between the simulated evapotranspiration (ET) and site observations in the growing season

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Table 5. Comparison between the simulated evapotranspiration (ET) and site observations in the growing season

蒸散发产品	小麦生长季（当年10月初—次年6月中旬）			玉米生长季（当年6月中旬—9月末）
蒸散发产品	R	RMSE/(mm/d)	Bias/%	R	RMSE/(mm/d)	Bias/%
PML_V2	0.85	0.89	-26.16	0.46	1.03	10.41
MOD16A2	0.61	1.63	-51.32	0.29	1.49	-21.50
SSEBop_V4	0.86	0.88	-3.81	0.20	1.86	41.24

Table 6. Areal proportion of the evapotranspiration ET products of different land types by R and root mean square error (RMSE)

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Table 6. Areal proportion of the evapotranspiration ET products of different land types by R and root mean square error (RMSE)

蒸散发产品	土地类型	R		RMSE
蒸散发产品	土地类型	>0.8的占比/%	<0.6的占比/%	>8 mm/8 d的占比/%	<6 mm/8 d的占比/%
PML_V2-SSEBop_V4	耕地	48.41	10.39	0.83	66.92
	林地	90.11	0.14	0.003	97.72
	草地	42.51	7.25	0.13	82.08
	研究区	46.04	10.45	1.01	69.78
SSEBop_V4-MOD16A2	耕地	14.91	42.43	78.23	1.78
	林地	14.95	4.87	44.37	0.32
	草地	5.02	52.92	50.63	0.63
	研究区	11.71	43.66	69.00	1.47
PML_V2-MOD16A2	耕地	32.63	32.37	50.25	6.49
	林地	21.42	3.89	0.03	87.37
	草地	8.69	52.15	1.34	74.93
	研究区	24.36	36.50	34.27	24.61

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Shaoyang HE, Jing TIAN, Yongqiang ZHANG. Verification and comparison of three high-resolution surface evapotranspiration products in North China[J]. Resources Science, 2020, 42(10): 2035

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Paper Information

Received: May. 6, 2020

Accepted: --

Published Online: Apr. 23, 2021

The Author Email: Jing TIAN (tianj.04b@igsnrr.ac.cn)

DOI:10.18402/resci.2020.10.19

Topics

Resource Economy

Research Articles

Table 1. Three evapotranspiration products with high resolution

Table 1. Three evapotranspiration products with high resolution

Table 2. Five flux stations on the North China Plain

Table 2. Five flux stations on the North China Plain

Table 3. Reclassification method for the land cover data of MCD12Q1

Table 3. Reclassification method for the land cover data of MCD12Q1

Table 4. Accuracy evaluation of the simulated daily evapotranspiration (ET) at the five flux stations

Table 4. Accuracy evaluation of the simulated daily evapotranspiration (ET) at the five flux stations

Table 5. Comparison between the simulated evapotranspiration (ET) and site observations in the growing season

Table 5. Comparison between the simulated evapotranspiration (ET) and site observations in the growing season

Table 6. Areal proportion of the evapotranspiration ET products of different land types by R and root mean square error (RMSE)

Table 6. Areal proportion of the evapotranspiration ET products of different land types by R and root mean square error (RMSE)

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