Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin
The interaction between land surface and atmosphere plays an important role in the climate system. Soil-atmosphere feedback mechanisms are analyzed by calculating the hydric condition (HC) of the soil from the water balance. Spatial coherence between HC and the Standardized Precipitation Index (SPI)...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v68_n2-3_p215_Penalba http://hdl.handle.net/20.500.12110/paper_0936577X_v68_n2-3_p215_Penalba |
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paper:paper_0936577X_v68_n2-3_p215_Penalba2023-06-08T15:53:19Z Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin Penalba, Olga C. Bettolli, María Laura Atmospheric circulation Dry months Hydric condition La Plata Basin Precipitation extremes Weather types Wet months air-soil interaction atmospheric circulation climate modeling dry season extreme event feedback mechanism moisture content precipitation intensity rainfall regional climate soil moisture water budget wet season La Plata Basin The interaction between land surface and atmosphere plays an important role in the climate system. Soil-atmosphere feedback mechanisms are analyzed by calculating the hydric condition (HC) of the soil from the water balance. Spatial coherence between HC and the Standardized Precipitation Index (SPI) as well as the circulation patterns associated with rainfall shortages and excess was evaluated over the southern La Plata Basin, fulfilling one of the objectives of the CLARIS LPB project. Monthly precipitation, and maximum and minimum temperatures registered at 35 stations over the 1961-2008 period were used to calculate the HC and SPI indices while the characteristics of the associated circulation were derived from daily sea level pressure fields from NCEP DOE Reanalysis 2 for a domain covering South America. Our results show that the HC responds better to accumulated precipitation anomalies in relatively short time scales. Dry and wet months were selected based on the SPI, according to several thresholds that define the spatial extension of these events. This analysis depends on the region, indicating the diversity of dry and wet events. Nevertheless, spatial coherence between both indices was found for regional extreme events. The analysis of the circulation showed that specific daily surface circulation types contribute to wet and dry cases and have a predominant occurrence related to the climatology in the development of the extreme hydric events in the region. This research complements previous studies carried out with modeled data and shows the complexity in the propagation of the precipitation anomalies through the soil/land surface. © Inter-Research 2016. Fil:Penalba, O.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bettolli, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v68_n2-3_p215_Penalba http://hdl.handle.net/20.500.12110/paper_0936577X_v68_n2-3_p215_Penalba |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Atmospheric circulation Dry months Hydric condition La Plata Basin Precipitation extremes Weather types Wet months air-soil interaction atmospheric circulation climate modeling dry season extreme event feedback mechanism moisture content precipitation intensity rainfall regional climate soil moisture water budget wet season La Plata Basin |
| spellingShingle |
Atmospheric circulation Dry months Hydric condition La Plata Basin Precipitation extremes Weather types Wet months air-soil interaction atmospheric circulation climate modeling dry season extreme event feedback mechanism moisture content precipitation intensity rainfall regional climate soil moisture water budget wet season La Plata Basin Penalba, Olga C. Bettolli, María Laura Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| topic_facet |
Atmospheric circulation Dry months Hydric condition La Plata Basin Precipitation extremes Weather types Wet months air-soil interaction atmospheric circulation climate modeling dry season extreme event feedback mechanism moisture content precipitation intensity rainfall regional climate soil moisture water budget wet season La Plata Basin |
| description |
The interaction between land surface and atmosphere plays an important role in the climate system. Soil-atmosphere feedback mechanisms are analyzed by calculating the hydric condition (HC) of the soil from the water balance. Spatial coherence between HC and the Standardized Precipitation Index (SPI) as well as the circulation patterns associated with rainfall shortages and excess was evaluated over the southern La Plata Basin, fulfilling one of the objectives of the CLARIS LPB project. Monthly precipitation, and maximum and minimum temperatures registered at 35 stations over the 1961-2008 period were used to calculate the HC and SPI indices while the characteristics of the associated circulation were derived from daily sea level pressure fields from NCEP DOE Reanalysis 2 for a domain covering South America. Our results show that the HC responds better to accumulated precipitation anomalies in relatively short time scales. Dry and wet months were selected based on the SPI, according to several thresholds that define the spatial extension of these events. This analysis depends on the region, indicating the diversity of dry and wet events. Nevertheless, spatial coherence between both indices was found for regional extreme events. The analysis of the circulation showed that specific daily surface circulation types contribute to wet and dry cases and have a predominant occurrence related to the climatology in the development of the extreme hydric events in the region. This research complements previous studies carried out with modeled data and shows the complexity in the propagation of the precipitation anomalies through the soil/land surface. © Inter-Research 2016. |
| author |
Penalba, Olga C. Bettolli, María Laura |
| author_facet |
Penalba, Olga C. Bettolli, María Laura |
| author_sort |
Penalba, Olga C. |
| title |
Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| title_short |
Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| title_full |
Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| title_fullStr |
Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| title_full_unstemmed |
Extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la Plata Basin |
| title_sort |
extreme rainfall, hydric conditions and associated atmospheric circulation in the southern la plata basin |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0936577X_v68_n2-3_p215_Penalba http://hdl.handle.net/20.500.12110/paper_0936577X_v68_n2-3_p215_Penalba |
| work_keys_str_mv |
AT penalbaolgac extremerainfallhydricconditionsandassociatedatmosphericcirculationinthesouthernlaplatabasin AT bettollimarialaura extremerainfallhydricconditionsandassociatedatmosphericcirculationinthesouthernlaplatabasin |
| _version_ |
1768544282274168832 |