Analysis of surface radiation fluxes and environmental variables over Caatinga vegetation with different densities

IF 2.6 3区 环境科学与生态学 Q2 ECOLOGY
Delson J.F. Silva , Tarciana R.B.F. Silva , Michele L. de Oliveira , Gabriel de Oliveira , Manoranjan Mishra , Celso Augusto Guimarães Santos , Richarde Marques da Silva , Carlos A.C. dos Santos
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Abstract

The Caatinga biome, characterized by its dynamic vegetation due to climate and land use changes, experiences varied environmental responses during the dry and rainy seasons. This research aims to dissect the complexity of surface radiation fluxes, vapor pressure, and air and soil temperatures across three distinct vegetation densities within the Caatinga: recovering, degraded, and preserved. Utilizing data from Moderate Resolution Imaging Spectroradiometer/Enhanced Vegetation Index products to analyze these densities offers a novel lens through which to view the biome's reaction to climatic shifts. Our findings unveiled specific patterns of solar and longwave radiation fluxes that correlate with key climatic variables like air temperature and surface albedo. This investigation not only addresses a critical gap in our knowledge of a globally significant but underexplored biome, but it also advances our comprehension of how vegetation density influences radiation fluxes in arid settings. Insights from this study are vital for forecasting and mitigating the ecological and climatic impacts of land cover transformations in semiarid regions worldwide. Significantly, the degraded site displayed nearly double the solar radiation reflection (138 Wm−2) compared to the recovering site (68 Wm−2), underscoring the role of vegetation density in modulating local climate conditions, despite atmospheric consistency across the study sites.

Abstract Image

不同密度的卡廷加植被表面辐射通量和环境变量分析
卡廷加生物群落的特点是其植被因气候和土地利用的变化而不断变化,在旱季和雨季会出现不同的环境反应。这项研究旨在剖析卡廷加地区三种不同植被密度(恢复中、退化中和保存中)的地表辐射通量、水汽压力以及空气和土壤温度的复杂性。利用中分辨率成像分光仪/增强植被指数产品的数据来分析这些密度为观察生物群落对气候变化的反应提供了一个新的视角。我们的研究结果揭示了太阳和长波辐射通量的特定模式,这些模式与气温和地表反照率等关键气候变量相关。这项研究不仅填补了我们对这一具有全球意义但尚未得到充分探索的生物群落的认识空白,而且还加深了我们对植被密度如何影响干旱环境中辐射通量的理解。这项研究的启示对于预测和减轻全球半干旱地区土地植被变化对生态和气候的影响至关重要。值得注意的是,退化地点的太阳辐射反射率(138 Wm-2)几乎是恢复地点(68 Wm-2)的两倍,这突出表明了植被密度在调节当地气候条件方面的作用,尽管各研究地点的大气条件一致。
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来源期刊
Journal of Arid Environments
Journal of Arid Environments 环境科学-环境科学
CiteScore
5.70
自引率
3.70%
发文量
144
审稿时长
55 days
期刊介绍: The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.
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