Carbon monoxide trend in the city of Rio de Janeiro via mann-kendall and cusum tests

Authors

  • Givanildo de Gois Universidade Federal Fluminense
  • José Francisco de Oliveira-Junior Universidade Federal de Alagoas
  • Elania Barros da Silva Secretaria Municipal de Saúde de Capela
  • Juliana Lúcio Motta Maia Universidade Federal Fluminense
  • Indira Sueline Silva Aleluia Universidade Federal de Alagoas
  • Paulo Eduardo Teodoro Universidade Estadual de Mato Grosso do Sul

DOI:

https://doi.org/10.14393/BJ-v33n5a2017-37420

Keywords:

emissions, pollutants, statistical tests, air quality

Abstract

Hourly mean concentrations of carbon monoxide trend (CO) in the city of Rio de Janeiro (CRJ) was evaluated based on statistical tests. Air quality stations used were: Central, Copacabana, São Cristóvão and Tijuca from 2010 to 2014. The results of the CO trend based on the Mann-Kendall (MK) test showed an inverse correlation with time, with significant decrease in all seasons. Significant increase trend (Z > 0) and p-value < 0.05 were recorded in Centro and Tijuca in 2010 and 2012 with magnitude between 0.0224 and 0.0067 ppm/year. Insignificant increase occurred only in São Cristóvão (2011) for positive values (Z > 0) and p-value > 0.05. CUSUM test showed that  magnitude did not exceed the critical value at 1% and 5% probability levels. Cumulative Sum Test (CUSUM) showed homogeneous and significant CO concentrations. Significant abrupt changes occurred in the months of May, June, July, August and September and insignificant in January, February, June, August and November at 1% and 5% probability. CO concentrations occurred in the predominant directions North-Northwest (NNW), South-Southwest (SSW) and South-west (SW). Both sectors are influenced by the main synoptic systems (Frontal System and South Atlantic Subtropical High) that act on CRJ. MK and CUSUM tests proved to be efficient in evaluating trends and abrupt changes in CO concentrations and air quality stations in the CRJ.

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Published

2017-09-21

How to Cite

GOIS, G. de, OLIVEIRA-JUNIOR, J.F. de, DA SILVA, E.B., MOTTA MAIA, J.L., ALELUIA, I.S.S. and TEODORO, P.E., 2017. Carbon monoxide trend in the city of Rio de Janeiro via mann-kendall and cusum tests . Bioscience Journal [online], vol. 33, no. 5, pp. 1332–1339. [Accessed8 December 2022]. DOI 10.14393/BJ-v33n5a2017-37420. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/37420.

Issue

Section

Biological Sciences