基于台站和MOD16数据的山东省蒸散及潜在蒸散时空变化

doi:10.18306/dlkxjz.2017.08.013

Abstract

Abstract:

Spatiotemporal pattern analysis of evapotranspiration plays an important role in understanding the interaction between climate change and water resources. Based on the Penman-Monteith formula, this study analyzed the temporal and spatial characteristics of land surface evapotranspiration and its correlation with meteorological factors in Shandong Province from 2000-2014 with the MODIS ET product (MOD16) and the observation data of evaporation dishes at meteorological stations. We first examined the accuracy of MOD16 for Shandong Province and selected 13 weather stations within the province with daily values of atmospheric pressure, temperature, precipitation, evaporation, relative humidity, wind direction, wind speed, sunshine hours, and 0 cm land surface temperature from 2000-2014. Through the analysis of the spatiotemporal correlation between MOD16 potential evapotranspiration (PET) and the observation data of evaporation dishes at the meteorological stations, the effectiveness of the MOD16 PET in the area was verified. Then we used the MRT tool provided by MODLAND to splice MOD16 and convert the projection into longitude and latitude by taking WGS-8 as the reference surface. Finally, based on MOD16 and the meteorological data, the spatiotemporal distribution characteristics of ET and PET from 2000-2014 were analyzed. The main conclusions are as follows. (1) There was plentiful water in the eastern part of Shandong Province while the western part was short of water, which resulted in a clear difference of ET over different areas in the province. (2) The annual fluctuations of ET and PET from 2000-2014 were relatively small. The average value of ET was 1529 mm while that of PET was 2178 mm, which indicates that Shandong Province is a relatively dry area. (3) The correlation analysis between evapotranspiration and meteorological factors indicates that the spatiotemporal variation of evapotranspiration was closely related to many climatic factors, especially the water and heat conditions.

Key words: MOD16, evapotranspiration, potential evapotranspiration, meteorological factor, spatiotemporal variation, Shandong Province

Shen ZHAO, Shaohui CHEN. Spatiotemporal variations of evapotranspiration and potential evapotranspiration in Shandong Province based on station observations and MOD16[J].PROGRESS IN GEOGRAPHY, 2017, 36(8): 1040-1047.

Figures/Tables 8

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	相对湿度	气温	降水	气压	蒸发量	日照时数	风速
ET	0.741	0.628	0.757	0.221	-0.487	-0.653	-0.302
PET	-0.724	-0.509	-0.813	-0.206	0.621	0.862	0.432

	相对湿度	气温	降水	气压	蒸发量	日照时数	风速
ET	0.560	0.725	0.732	-0.682	0.521	0.145	-0.143
PET	-0.072	0.913	0.573	-8.016	0.653	0.706	0.582

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Spatiotemporal variations of evapotranspiration and potential evapotranspiration in Shandong Province based on station observations and MOD16

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