Trends in the Hydrometeorological Regime on an Island in the South Atlantic Ocean (Tendências No Regime Hidrometeorológico Em Uma Ilha Oceânica No Oceano Atlântico Sul)

Durães, Matheus Fonseca; Mello, Carlos Rogério de; Beskow, Samuel

doi:10.5380/abclima.v18i0.42673

Cited by 1 publication

(1 citation statement)

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“…Associated with the information available in time series, trend analysis allows the knowledge of the behavior of a given phenomenon over time. This analysis is often used to identify significant variations in the series of environmental variables such as precipitation (Menezes & Fernandes, 2016;Durães et al, 2016), temperature (Salviano et al, 2016;Wanderley et al, 2016), evapotranspiration (Alencar et al, 2011), vegetation coverage (Neeti & Eastman, 2011;Lukes et al, 2016;Planque et al, 2017), among others.…”

Section: Introductionmentioning

confidence: 99%

Albedo Trend Analyses in Atlantic Forest Biome Areas

Alba¹,

Pereira²,

Marchesan³

et al. 2018

JAS

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The albedo is an important variable that controls the balance of radiation and energy of the atmosphere, so changes in land cover cause alterations in albedo values, influencing changes in climate behavior at different scales. The goal in this work was to investigate the possible occurrence and causes associated with surface albedo trends within the Atlantic Forest biome (São Francisco de Paula, state of Rio Grande do Sul, Brazil), during the last thirty years (1987-2017), evaluating the impacts of the forest cover structure on albedo trends. The study included images of the TM/Landsat 5 and OLI/Landsat 8 sensors over the period 1987 to 2017. The surface albedo was obtained from the SEBAL algorithm, which includes in its variables the reflectance values of each band, reflected solar radiation and atmospheric transmissivity. The trend analysis was performed by the Mann-Kendall test verifying the existence of significant trends over 30 years. Subsequently, the influence of vegetation greenness on the trend presented by the albedo surface was evaluated. Approximately 92% of the pixels with significant tendency are associated with the decreasing tendency of the albedo. The downward trend was observed with the change from the field to the forest cover, while increasing trends were influenced by the change in forest cover, such as the suppression of individuals from the upper forest canopy. The forest populations in areas of the Mata Atlântica biome had a large participation in the energy balance, which exposed a reduction of approximately 60% of the surface albedo with its implantation, showing its importance for reducing the emission of energy to the atmosphere. The spatial pattern of the trend distribution of the surface albedo is related to the concentration and vigor of the arboreal vegetation.

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