Thermodynamic analysis of convective events that occurred in Belém-PA city
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2022
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| _version_ | 1876424594776129536 |
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| author | Ludmila Monteiro da Silva |
| author_facet | Ludmila Monteiro da Silva |
| contents | Thermodynamic analysis of convective events that occurred in Belém-PA city Ludmila Monteiro da Silva Maria Aurora Santos da Mota Biología Instability Deep convection Eastern Amazonia Shallow convection The Amazon Basin is dominated by convective rainfall with significant spatial and diurnal variability. Diurnal and seasonal distributions of convective events were determined from rainfall and Cloud Top Temperature (CTT) between January 2008 and December 2010 in city Belém-PA. The decis technique was used to select the most intense events (rainfall rate ≥ 15 mm h–1), which were subsequently, subclassified into deep convection events (DCE) and shallow convection events (SCE). Ninety four cases were found, mostly occurring between 12 and 19 LT, and 55% in the rainy season. Another set of DCE and SCE with rainfall rate ≥ 1 mm h–1 was selected to analyze the effect of seasonality. Of these, 42 cases were found also between 12 and 19 LT, with a maximum at 16 LT. Temperature profiles differed between the rainy and less rainy seasons, in the intensification of shallow and deep convection. Moisture profiles showed greater variability between 850 and 500 hPa, indicative of their role in convective activity; during the rainy season the atmosphere was more humid (less humid) before (at the time) of the occurrence of DCE. Wind components showed significant shear between surface and ~850 hPa, with stronger zonal component in the cases of DCE. The highest values of CAPE were observed about 2 to 3 hours before DCE and SCE, with maximum values before DCE in the rainy season. Results presented here are relevant to improve short-term forecasts and convective event simulations with numerical weather and climate models. 2022 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56581609008 https://www.redalyc.org/journal/565/56581609008/ https://www.redalyc.org/journal/565/56581609008/html/ https://www.redalyc.org/journal/565/56581609008/56581609008.epub https://www.redalyc.org/journal/565/56581609008/movil 10.20937/ATM.52934 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.2 Vol.35 |
| format | Artículo científico |
| id | redalyc_56581609008 |
| institution | Redalyc |
| language | en |
| publishDate | 2022 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Thermodynamic analysis of convective events that occurred in Belém-PA city Ludmila Monteiro da Silva Biología Instability Deep convection Eastern Amazonia Shallow convection Thermodynamic analysis of convective events that occurred in Belém-PA city Ludmila Monteiro da Silva Maria Aurora Santos da Mota Biología Instability Deep convection Eastern Amazonia Shallow convection The Amazon Basin is dominated by convective rainfall with significant spatial and diurnal variability. Diurnal and seasonal distributions of convective events were determined from rainfall and Cloud Top Temperature (CTT) between January 2008 and December 2010 in city Belém-PA. The decis technique was used to select the most intense events (rainfall rate ≥ 15 mm h–1), which were subsequently, subclassified into deep convection events (DCE) and shallow convection events (SCE). Ninety four cases were found, mostly occurring between 12 and 19 LT, and 55% in the rainy season. Another set of DCE and SCE with rainfall rate ≥ 1 mm h–1 was selected to analyze the effect of seasonality. Of these, 42 cases were found also between 12 and 19 LT, with a maximum at 16 LT. Temperature profiles differed between the rainy and less rainy seasons, in the intensification of shallow and deep convection. Moisture profiles showed greater variability between 850 and 500 hPa, indicative of their role in convective activity; during the rainy season the atmosphere was more humid (less humid) before (at the time) of the occurrence of DCE. Wind components showed significant shear between surface and ~850 hPa, with stronger zonal component in the cases of DCE. The highest values of CAPE were observed about 2 to 3 hours before DCE and SCE, with maximum values before DCE in the rainy season. Results presented here are relevant to improve short-term forecasts and convective event simulations with numerical weather and climate models. 2022 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56581609008 https://www.redalyc.org/journal/565/56581609008/ https://www.redalyc.org/journal/565/56581609008/html/ https://www.redalyc.org/journal/565/56581609008/56581609008.epub https://www.redalyc.org/journal/565/56581609008/movil 10.20937/ATM.52934 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.2 Vol.35 |
| title | Thermodynamic analysis of convective events that occurred in Belém-PA city |
| topic | Biología Instability Deep convection Eastern Amazonia Shallow convection |
| url | https://www.redalyc.org/articulo.oa?id=56581609008 https://www.redalyc.org/journal/565/56581609008/ https://www.redalyc.org/journal/565/56581609008/html/ https://www.redalyc.org/journal/565/56581609008/56581609008.epub https://www.redalyc.org/journal/565/56581609008/movil |