Evapotranspiration estimation of Urmia Lake Basin using GCOM-C thermal imagery

Evapotranspiration estimation of Urmia Lake Basin using GCOM-C thermal imagery
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使用 GCOM-C 热图像估算乌尔米耶湖流域的蒸散量

DOI:
10.1088/1755-1315/958/1/012010
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发表时间:
2021
期刊:
IOP Conference Series: Earth and Environmental Science
影响因子:
--
通讯作者:
Moriyama M
Moriyama M
中科院分区:
--
文献类型:
--
作者:
Tasumi M;Moriyama M

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应用全球气候变化观测使命(GCOM-C)全球蒸散指数(ETindex)估算算法,利用GCOM-C卫星热成像资料,估算了乌尔米耶湖流域尺度的月、年蒸散量(ET)。本研究总共使用了2018 - 2019年期间获取的297张卫星图像。ET估计精度进行了检查,占主导地位的地区,采用传统的地面灌溉的苹果田。估计的蒸散量比标准作物蒸散量低15%,标准作物蒸散量是使用联合国粮食及农业组织建议的程序在月时间尺度上计算的,在年时间尺度上低8%。估计的ET与卫星ET地图的比较,通过使用映射蒸散在高分辨率与内部校准(METRIC)模型得出了类似的差异。不同来源的ET之间的8%-15%的差异很小,因为即使在地面ET测量中也经常存在类似或更大范围的不确定性。将估算的蒸散量与MODIS蒸散产品(MOD 16)进行比较,发现苹果田的估算面积差异较大。考虑到气候ET需求和该地区的灌溉实践,ET估计精度更可能是使用本研究得出的数据集比使用MOD 16更高。GCOM-C卫星于2018年1月开始进行常规地表观测。它对农业水资源管理的贡献,如本研究中提出的ET估计,将随着历史数据存储量的不断积累而增加。
Basin-scale monthly and annual evapotranspiration (ET) is estimated for Urmia Lake Basin by applying the Global Change Observation Mission for Climate (GCOM-C) global ETindex estimation algorithm to thermal imagery observed by the GCOM-C satellite. In total, 297 satellite images acquired during 2018-2019 were used in this study. ET estimation accuracy was examined for an area dominated by apple fields using traditional surface irrigation. The estimated ET was 15% lower than the standard crop ET, which was computed using a procedure suggested by the Food and Agriculture Organization of the United Nations on a monthly timescale, and was 8% lower on an annual timescale. Comparison of estimated ET with a satellite-based ET map derived by using the Mapping EvapoTranspiration at high Resolution with Internalized Calibration (METRIC) model showed a similar difference. The 8%–15% differences among the different sources of ET were small, given that a similar or wider range of uncertainty is frequently available even in ground-based ET measurements. Comparison between the estimated ET and the MODIS ET Product (MOD16) revealed a greater difference in the evaluated area of the apple fields. Given the climatic ET demands and the irrigation practices of the area, ET estimation accuracy is more likely to be higher using the dataset derived from this study than using MOD16. The GCOM-C satellite started routine surface observations in January 2018. Its contribution to agricultural water management, such as by estimating ET as presented in this study, will increase as the amount of historical data stored continues to accumulate.
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