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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spatiotemporal variability of atmospheric CO2 concentration and controlling factors over sugarcane cultivation areas in southern Brazil

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da Costa, Luis Miguel [1] ; de Araujo Santos, Gustavo Andre [1] ; de Mendonca, Gislaine Costa [1] ; Favacho Morais Filho, Luiz Fernando [1] ; de Meneses, Kamila Cunha [1] ; Rolim, Glauco de Souza [1] ; La Scala, Jr., Newton [1]
Total Authors: 7
[1] Sao Paulo State Univ, Dept Engn & Exact Sci, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Web of Science Citations: 0

With the advancement of remote sensing, it is now possible to identify and characterize greenhouse gas emissions under deferment land uses. Given the above, this study aimed to characterize the spatial-temporal variability and the main factors controlling the average atmospheric CO2 column (Xco(2)) in the macroregion of Ribeirao Preto (MRP), Sao Paulo, a significant sugarcane producer in Brazil. We obtained remote sensing data from January 2015 to December 2018. The variables used were Xco(2) and sun-induced fluorescence of chlorophyll (SIF) by NASA's Orbiting Carbon Observatory-2 satellite (OCO-2), relative humidity (RH), global radiation (Qg), and the average temperature at 2 m (T2m) by the NASA-POWER platform, and leaf area index (LAI) and evapotranspiration by Penman-Monteith (ET) by MODIS sensor. We evaluated the data in trimester's averages, where descriptive statistics, Pearson correlation and linear regression have been applied. The spatial distribution was made by the inverse distance weighted (IDW). The minimum (390.40 +/- 0.41 ppm) and maximum (394.75 +/- 0.34 ppm) mean of Xco(2) was observed in the first quarter of 2015 and third quarter of 2017. The Xco2 obtained negative correlations with the SIF (-0.81), LAI (-0.81), RH (-0.74), ET (-0.84), and Qg (-0.51). Hotspots and coldspots of Xco(2) tend to vary over the years. We conclude that the temporal variation of Xco(2) above sugarcane areas in southern Brazil is well represented by a periodic function. Our results indicate photosynthesis and soil exposure after harvest are factors that could act as source and sink of CO2. (AU)

FAPESP's process: 19/25812-4 - Spatiotemporal variability of atmospheric CO2 in the state of São Paulo, Brazil: a perspective with remote sensing
Grantee:Luis Miguel da Costa
Support type: Scholarships in Brazil - Scientific Initiation