Identification of the Driving factors impacts of Land Surface Albedo over Iran: An analysis with the MODIS data

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Omid Reza Kefayat Motlagh, Mohammad Darand
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Abstract

Albedo is a key parameter in climatic research and depends on environmental and climatic factors. Modeling these factors greatly contributes to understanding environmental variations. To this end, the data of Land Surface Albedo, Land Surface Temperature (LST), Vegetation, Snow, Elevation, Slope, and Aspect of the MODIS sensor from 1/1/2001 to 30/12/2021 with a 1000-m spatial resolution were used. After pre-processing, monthly, seasonal, and annual albedo modeling was performed using multiple linear regression (MLR) in the highlands of Iran. The results of monthly modeling revealed the salient direct role of snow on the albedo of Iran's highlands in all months, except for July, August, and September. In these months, due to the lack of snow coverage and the fruiting of agricultural lands and gardens, the inverse role of vegetation on albedo variations is determining. Seasonal examinations also showed that snow plays a significant role on the albedo of Iran's highlands in winter, spring, and fall; however, vegetation has a determining role in the summer. The annual results indicated that snow, vegetation, elevation, slope, LST, and aspect, respectively, are the factors affecting albedo in the highlands of Iran. Furthermore, the role of snow, LST, and aspect is positive, while the role of vegetation, elevation, and slope is negative on albedo.
确定影响伊朗陆地表面反照率的驱动因素:利用 MODIS 数据进行分析
反照率是气候研究中的一个关键参数,取决于环境和气候因素。建立这些因素的模型大大有助于了解环境变化。为此,我们使用了 MODIS 传感器从 2001 年 1 月 1 日至 2021 年 12 月 30 日空间分辨率为 1000 米的地表反照率、地表温度、植被、积雪、海拔、坡度和朝向数据。经过预处理后,使用多元线性回归(MLR)对伊朗高原进行了月度、季节和年度反照率建模。月度模型的结果显示,除七月、八月和九月外,雪对伊朗高原所有月份的反照率都有显著的直接影响。在这几个月里,由于积雪覆盖面积不足,加上农田和花园正在开花结果,植被对反照率变化的反向作用是决定性的。季节性研究还表明,在冬季、春季和秋季,积雪对伊朗高原的反照率起着重要作用;但在夏季,植被起着决定性作用。年度结果表明,积雪、植被、海拔、坡度、LST 和地势分别是影响伊朗高原反照率的因素。此外,积雪、低海拔气温和相向对反照率的影响是积极的,而植被、海拔和坡度对反照率的影响是消极的。
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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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