Comparison of PBL Heights from Ceilometer Measurements and Greenhouse Gases Concentrations in São Paulo

Author:

Vieira dos Santos Amanda1ORCID,Cristina Araújo Elaine1,da Silva Andrade Izabel1ORCID,Corrêa Thais1,Talita Amorim Marques Márcia2,Eduardo Souto-Oliveira Carlos2,Franchi Leonardo Noele2ORCID,de Mendonça Macedo Fernanda3,Souza Giovanni1ORCID,Pereira de Queiroz Lopes Pérola1ORCID,de Arruda Moreira Gregori4ORCID,de Fátima Andrade Maria2ORCID,Landulfo Eduardo1ORCID

Affiliation:

1. Centro de Lasers e Aplicações (CELAP), Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN, São Paulo 05508-000, Brazil

2. Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo 05508-090, Brazil

3. Faculdade de Tecnologia do Estado de São Paulo (FATEC), Praia Grande 11700-100, Brazil

4. Federal Institute of São Paulo (IFSP), Campus Registro, São Paulo 11900-000, Brazil

Abstract

This paper presents a study conducted in São Paulo, Brazil, where the planetary boundary layer height (PBLH) was determined using ceilometer data and the wavelet covariance transform method. The retrieved PBLH values were subsequently compared with the concentrations of CO2 and CH4 measured at three distinct experimental sites in the city. The period of study was July 2021. This study also included a comparison between ceilometer data and lidar data, which demonstrated the favorable applicability of the ceilometer data for PBLH estimation. An examination of the correlation between changes in average CO2 concentrations and PBLH values revealed stronger correlations for the IAG and UNICID stations, with correlation coefficients (ρ) of approximately −0.86 and −0.85, respectively, in contrast to the Pico do Jaraguá station, which exhibited a lower correlation coefficient of −0.42. When assessing changes in CH4 concentrations against variations in PBL height, the retrieved correlation coefficients were approximately −0.78 for IAG, −0.66 for UNICID, and −0.38 for Pico do Jaraguá. The results indicated that CO2/CH4 concentrations are negatively correlated with PBL heights, with CO2 concentrations showing more significant correlation than CH4. Additionally, among the three measurement stations, IAG measurements displayed the most substantial correlation. The results from this study contribute to the understanding of the relationship between PBLH and greenhouse gas concentrations, emphasizing the potential of remote sensing systems like ceilometers in monitoring and studying atmospheric processes.

Funder

Brazilian Research Foundation

National Council for Scientific and Technological Development

São Paulo Research Foundation (FAPESP): METROCLIMA project

Publisher

MDPI AG

Subject

Atmospheric Science,Environmental Science (miscellaneous)

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