| Full text | |
| Author(s): |
Sanchez, Maciel Pinero
[1]
;
de Oliveira, Amauri Pereira
[1]
;
de Varona, Ramon Perez
[2]
;
Tito, Janet Valdes
[1]
;
Codato, Georgia
[1]
;
Dutra Ribeiro, Flavia Noronha
[3]
;
Marques Filho, Edson Pereira
[4]
;
da Silveira, Lucas Cardoso
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Inst Astron Geophys & Atmospher Sci, Dept Atmospher Sci, Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Phys, Dept Expt Phys, Sao Paulo - Brazil
[3] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil
[4] Univ Fed Bahia, Interdisciplinary Ctr Energy & Environm, Salvador, BA - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | EARTH AND SPACE SCIENCE; v. 7, n. 2 FEB 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
The main features of the urban boundary layer in the metropolitan region of Sao Paulo are estimated based on rawinsondes carried out (a) every 3 hr in two 10-day field campaigns of the MCITY BRAZIL Project during the summer and winter of 2013 and (b) regularly once per day and continuously for 4 years from 2009 to 2013. On average, the boundary layer height showed a daytime maximum of 1476 +/- 149 m in summer and 1122 +/- 168 m in winter campaigns. The differences are related to seasonal variations in the (a) buoyancy flux at the surface, which was 30% larger in summer (4.7 +/- 0.6 MJ m(-2) day(-1)), and the (b) static stability of the free atmosphere, which was 15% smaller in summer (3.3 +/- 0.1 K km(-1)). The average nighttime boundary layer height, estimated from equilibrium empirical expression, indicated maximum of 126 +/- 13 m in summer and 122 +/- 10 m in winter campaigns. The presence of a low-level jet was identified in 80% of the field campaign nights, with intensity varying from 2.7 to 14 m s(-1) and height ranging from 95 to 962 m. The nighttime residual-mixing layer is well estimated using the air temperature gradient method and is a good indication of the maximum vertical evolution of the previous daytime boundary layer. The monthly average maximum boundary layer height varied from a minimum of 1,061 +/- 77 m in September to maximum of 1,632 +/- 96 m in May. (AU) | |
| FAPESP's process: | 11/50178-5 - Urban tropical micrometeorology applied to climate change over the metropolitan urban regions of São Paulo and Rio de Janeiro |
| Grantee: | Amauri Pereira de Oliveira |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |