Spatio-temporal Variation Characteristics of Surface Evapotranspiration in the Korqin Grassland Based on MOD16 Products

doi:10.11755/j.issn.1006-7639(2021)-05-0831

Journal of Arid Meteorology ›› 2021, Vol. 39 ›› Issue (5): 831-837.DOI: 10.11755/j.issn.1006-7639(2021)-05-0831

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Spatio-temporal Variation Characteristics of Surface Evapotranspiration in the Korqin Grassland Based on MOD16 Products

YU Jing^1,²(),WANG Ying¹(),GAO Yamin²,QI Jiahui²,FU Ming³

1. Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster of China Meteorological Administration, Lanzhou 730020, China
2. Tongliao Meteorological Bureau of Inner Mongolia, Tongliao 028000, Inner Mongolia, China
3. Chifeng Meteorological Bureau of Inner Mongolia, Chifeng 024000, Inner Mongolia, China

Received:2020-10-23 Revised:2021-06-10 Online:2021-10-30 Published:2021-11-08
Contact: Ying WANG

基于MOD16产品的科尔沁草原地表蒸散时空变化特征

于静^1,²(),王莺¹(),高亚敏²,齐佳慧²,付铭³

1.中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃兰州 730020
2.内蒙古自治区通辽市气象局,内蒙古通辽 028000
3.内蒙古自治区赤峰市气象局,内蒙古赤峰 024000

通讯作者: 王莺
作者简介:于静(1991— ),女,工程师,主要从事气候变化、陆表蒸散以及干旱监测方面的研究. E-mail: yjarhope@163.com。
基金资助:
干旱气象科学研究基金项目(IAM201909);通辽市气象局科技创新项目(202101);内蒙古自治区自然科学基金(2018MS04001);内蒙古自治区科技成果转化专项(201905)

Abstract

Abstract:

Grassland is the main ecosystem of the Korqin area, and the quantitative study of its surface evapotranspiration is of great significance to master the ecological effect of the Korqin grassland. Based on surface evapotranspiration dataset of MOD16 and meteorological observation data from 2000 to 2019, the temporal and spatial variation characteristics of surface evapotranspiration and its meteorological influencing factors in the Korqin grassland were analyzed. The results are as follows: (1) MOD16 products have good applicability in the Korqin grassland, and the determination coefficient between surface potential evapotranspiration of MOD16 products (MOD16-PET) and evaporation of evaporating pan was above 0.9. (2) The monthly distribution of MOD16-ET and MOD16-PET presented a typical single-peak pattern in the Korqin grassland, and their evapotranspiration increased at first and then decreased. The inter-annual change of MOD16-ET was obvious than MOD16-PET in the Korqin grassland from 2000 to 2019. MOD16-ET increased significantly with 28.86 mm·(10 a)^-1 rate, and the increasing area was more than 75%, while MOD16-PET decreased significantly with a rate of 13.35 mm·(10 a)^-1 as a whole, and the increasing area was greater than the reducing area. (3) The high values of ET distributed in the northwest of the Korqin grassland, while that of PET distributed in the central region, and they had a reverse spatial differentiation characteristics to some extent. The surface evapotranspiration was different under different types of land use, and ET reduced from woodland, grassland and farmland in turn, while PET was opposite. (4) The mutation of ET from weak to strong occurred in 2003 and 2011, respectively, while that of PET from strong to weak occurred in 2015 in the Korqin grassland from 2000 to 2019, and ET in about 20% region would be likely to continue the current trend in the future. (5) The correlations of ET and PET with meteorological factors were consistent, and they were significantly and positively correlated with precipitation and sunshine hours, while their correlations weren’t obvious with temperature, relative humidity and wind speed.

Key words: Korqin grassland, surface evapotranspiration, spatial and temporal variation characteristics, meteorological influencing factors

摘要：

草原是科尔沁地区的主体生态系统,定量研究该地区地表蒸散发对掌握科尔沁草原的生态效应具有重要意义。基于2000—2019年MOD16地表蒸散数据集和气象站点观测数据,探讨分析科尔沁草原地表蒸散的时空变化特征及其气象影响因素。结果表明:(1)MOD16地表蒸散产品在科尔沁草原地区具有较好的适用性,其地表潜在蒸散产品数据与蒸发皿实测数据的决定系数达0.9以上。(2)近20 a科尔沁草原ET与PET均呈现“先升后降”的单峰型月际分布特征,ET的年际波动较PET明显,且ET整体以28.86 mm·(10 a)^-1的速率显著增加,增加区域超过研究区的75%,而PET整体则以13.35 mm·(10 a)^-1的速率显著减小,但速率增加的区域大于减小的区域。(3)ET高值区集中在科尔沁草原西北部,PET高值区则集中在中部地区,且二者存在一定的反向空间分异特征;不同土地利用类型下地表蒸散不同,ET自林地、草地、农田依次减小,而PET则相反。(4)近20 a科尔沁草原ET分别在2003年和2011年发生由弱至强的突变,而PET则在2015年发生由强至弱的突变,且未来约20%的区域地表实际蒸散可能持续目前的变化趋势。(5)科尔沁草原ET、PET与各气象因子的相关性一致,均与降水量、日照时数呈显著正相关,而与气温、相对湿度、风速等相关性不明显。

关键词: 科尔沁草原, 地表蒸散, 时空变化特征, 气象影响因子

CLC Number:

P426.2

YU Jing,WANG Ying,GAO Yamin,QI Jiahui,FU Ming. Spatio-temporal Variation Characteristics of Surface Evapotranspiration in the Korqin Grassland Based on MOD16 Products[J]. Journal of Arid Meteorology, 2021, 39(5): 831-837.

于静,王莺,高亚敏,齐佳慧,付铭. 基于MOD16产品的科尔沁草原地表蒸散时空变化特征[J]. 干旱气象, 2021, 39(5): 831-837.

Figures/Tables 7

Fig.1 Distribution of terrain height (shadows) and meteorological stations in study area

Fig.2 Correlation between pan evaporation and MOD16-PET product

Fig.3 The inter-annual (a) and monthly (b) changes of ET and PET in the Korqin grassland from 2000 to 2019

Fig.4 Change trend of ET (a) and PET (b) in the Korqin grassland from 2000 to 2019 (the values in blank areas for nodata, the same as below)

Fig.5 The Mann-Kendall test of average ET (a) and PET (b) in the Korqin grassland from 2000 to 2019

Fig.6 Spatial distribution of annual average ET (a) and PET (b) in the Korqin grassland (Unit: mm)

Tab.1 The correlation coefficients between surface evapotranspiration and meteorological factors in the Korqin grassland

气象因子	ET	PET
相对湿度	0.058	0.007
平均气温	0.05	0.03
降水量	0.66^*	0.32^*
日照时数	0.27^*	0.20^*
平均风速	0.03	0.01

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Spatio-temporal Variation Characteristics of Surface Evapotranspiration in the Korqin Grassland Based on MOD16 Products

基于MOD16产品的科尔沁草原地表蒸散时空变化特征

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