Summer dry events on synoptic and intraseasonal timescales inthe Southeast Region of Brazil
Fuente:
Redalyc
Saved in:
| Main Author: | |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1876428082846367744 |
|---|---|
| author | Anderson Augusto Bier |
| author_facet | Anderson Augusto Bier |
| contents | Summer dry events on synoptic and intraseasonal timescales inthe Southeast Region of Brazil Anderson Augusto Bier Simone Erotildes Teleginski Ferraz Tercio Ambrizzi Biología rainfall season Synoptic dry events intraseasonal dry events The occurrence of dry events in the Southeast Region of Brazil (SEB) during summer (rainfall season) has been in evidence in the last years, mainly due to previous extreme events in the 2013/14 and 2014/15 seasons. Drought analyses are usually carried out with monthly data. Here our methodology addresses the issue with daily data to generate a thorough analysis. Dry events were evaluated in different homogeneous precipitation sub-regions within the SEB, over 37 December-February (DJF) seasons and with two different timescales of duration: synoptic (5-9 days) and intraseasonal (≥10 days). Two main distinct dynamic patterns were found for dry events in southern and central-northern parts of SEB, respectively, but no significant differences were identified in the different timescales of occurrence. Southern events were characterized by a stationary ridge acting over the whole of southern South America, making the approximation of the transient system to southern SEB difficult. At the same time, this pattern showed a northern-shifted South Atlantic Convergence Zone (SACZ) configuration. In the central-northern events, a high pressure centered between Brazil’s South and Southeast regions was associated with the dryness conditions. An anomalous southward shift of meteorological systems characteristic of the South American summer was also verified for these events. Over the South Atlantic, an opposite SST anomaly configuration was identified between southern and central-northern events. 2023 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56582679005 https://www.redalyc.org/journal/565/56582679005/ https://www.redalyc.org/journal/565/56582679005/html/ https://www.redalyc.org/journal/565/56582679005/56582679005.epub https://www.redalyc.org/journal/565/56582679005/movil 10.20937/ATM.53025 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.1 Vol.36 |
| format | Artículo científico |
| id | redalyc_56582679005 |
| institution | Redalyc |
| language | en |
| publishDate | 2023 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Summer dry events on synoptic and intraseasonal timescales inthe Southeast Region of Brazil Anderson Augusto Bier Biología rainfall season Synoptic dry events intraseasonal dry events Summer dry events on synoptic and intraseasonal timescales inthe Southeast Region of Brazil Anderson Augusto Bier Simone Erotildes Teleginski Ferraz Tercio Ambrizzi Biología rainfall season Synoptic dry events intraseasonal dry events The occurrence of dry events in the Southeast Region of Brazil (SEB) during summer (rainfall season) has been in evidence in the last years, mainly due to previous extreme events in the 2013/14 and 2014/15 seasons. Drought analyses are usually carried out with monthly data. Here our methodology addresses the issue with daily data to generate a thorough analysis. Dry events were evaluated in different homogeneous precipitation sub-regions within the SEB, over 37 December-February (DJF) seasons and with two different timescales of duration: synoptic (5-9 days) and intraseasonal (≥10 days). Two main distinct dynamic patterns were found for dry events in southern and central-northern parts of SEB, respectively, but no significant differences were identified in the different timescales of occurrence. Southern events were characterized by a stationary ridge acting over the whole of southern South America, making the approximation of the transient system to southern SEB difficult. At the same time, this pattern showed a northern-shifted South Atlantic Convergence Zone (SACZ) configuration. In the central-northern events, a high pressure centered between Brazil’s South and Southeast regions was associated with the dryness conditions. An anomalous southward shift of meteorological systems characteristic of the South American summer was also verified for these events. Over the South Atlantic, an opposite SST anomaly configuration was identified between southern and central-northern events. 2023 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56582679005 https://www.redalyc.org/journal/565/56582679005/ https://www.redalyc.org/journal/565/56582679005/html/ https://www.redalyc.org/journal/565/56582679005/56582679005.epub https://www.redalyc.org/journal/565/56582679005/movil 10.20937/ATM.53025 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.1 Vol.36 |
| title | Summer dry events on synoptic and intraseasonal timescales inthe Southeast Region of Brazil |
| topic | Biología rainfall season Synoptic dry events intraseasonal dry events |
| url | https://www.redalyc.org/articulo.oa?id=56582679005 https://www.redalyc.org/journal/565/56582679005/ https://www.redalyc.org/journal/565/56582679005/html/ https://www.redalyc.org/journal/565/56582679005/56582679005.epub https://www.redalyc.org/journal/565/56582679005/movil |