Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models

The meteorological characteristics of the drought of 2005 in Amazonia, one of the most severe in the last 100 years were assessed using a suite of seven regional models obtained from the CLARIS LPB project. The models were forced with the ERA-Interim reanalyses as boundary conditions. We used a comb...

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Autores principales: Solman, Silvina Alicia, Pessacg, Natalia Liz, Carril, Andrea Fabiana
Publicado: 2013
Materias:
Amazonia
Downscaling
Drought
Regional models
annual variation
atmospheric circulation
boundary condition
climate effect
climate modeling
computer simulation
downscaling
drought
rainfall
regional climate
temperature anomaly
La Plata Basin
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v41_n11-12_p2937_Marengo
http://hdl.handle.net/20.500.12110/paper_09307575_v41_n11-12_p2937_Marengo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09307575_v41_n11-12_p2937_Marengo
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spelling paper:paper_09307575_v41_n11-12_p2937_Marengo2023-06-08T15:52:42Z Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models Solman, Silvina Alicia Pessacg, Natalia Liz Carril, Andrea Fabiana Amazonia Downscaling Drought Regional models annual variation atmospheric circulation boundary condition climate effect climate modeling computer simulation downscaling drought rainfall regional climate temperature anomaly Amazonia La Plata Basin The meteorological characteristics of the drought of 2005 in Amazonia, one of the most severe in the last 100 years were assessed using a suite of seven regional models obtained from the CLARIS LPB project. The models were forced with the ERA-Interim reanalyses as boundary conditions. We used a combination of rainfall and temperature observations and the low-level circulation and evaporation fields from the reanalyses to determine the climatic and meteorological characteristics of this particular drought. The models reproduce in some degree the observed annual cycle of precipitation and the geographical distribution of negative rainfall anomalies during the summer months of 2005. With respect to the evolution of rainfall during 2004-2006, some of the models were able to simulate the negative rainfall departures during early summer of 2005 (December 2004 to February 2005). The interannual variability of rainfall anomalies for both austral summer and fall over northern and southern Amazonia show a large spread among models, with some of them capable of reproducing the 2005 observed negative rainfall departures (four out of seven models in southern Amazonia during DJF). In comparison, all models simulated the observed southern Amazonia negative rainfall and positive air temperature anomalies during the El Nino-related drought in 1998. The spatial structure of the simulated rainfall and temperature anomalies in DJF and MAM 2005 shows biases that are different among models. While some models simulated the observed negative rainfall anomalies over parts of western and southern Amazonia during DJF, others simulated positive rainfall departures over central Amazonia. The simulated circulation patterns indicate a weaker northeasterly flow from the tropical North Atlantic into Amazonia, and reduced flows from southern Amazonia into the La Plata basin in DJF, which is consistent with observations. In general, we can say that in some degree the regional models are able to capture the response to the forcing from the tropical Atlantic during the drought of 2005 in Amazonia. Moreover, extreme climatic conditions in response to anomalous low-level circulation features are also well captured, since the boundary conditions come from reanalysis and the models are largely constrained by the information provided at the boundaries. The analysis of the 2005 drought suggests that when the forcing leading to extreme anomalous conditions is associated with both local and non-local mechanisms (soil moisture feedbacks and remote SST anomalies, respectively) the models are not fully capable of representing these feedbacks and hence, the associated anomalies. The reason may be a deficient reproduction of the land-atmosphere interactions. © 2013 Springer-Verlag Berlin Heidelberg. Fil:Solman, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pessacg, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Carril, A.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v41_n11-12_p2937_Marengo http://hdl.handle.net/20.500.12110/paper_09307575_v41_n11-12_p2937_Marengo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Amazonia
Downscaling
Drought
Regional models
annual variation
atmospheric circulation
boundary condition
climate effect
climate modeling
computer simulation
downscaling
drought
rainfall
regional climate
temperature anomaly
Amazonia
La Plata Basin
spellingShingle Amazonia
Downscaling
Drought
Regional models
annual variation
atmospheric circulation
boundary condition
climate effect
climate modeling
computer simulation
downscaling
drought
rainfall
regional climate
temperature anomaly
Amazonia
La Plata Basin
Solman, Silvina Alicia
Pessacg, Natalia Liz
Carril, Andrea Fabiana
Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
topic_facet Amazonia
Downscaling
Drought
Regional models
annual variation
atmospheric circulation
boundary condition
climate effect
climate modeling
computer simulation
downscaling
drought
rainfall
regional climate
temperature anomaly
Amazonia
La Plata Basin
description The meteorological characteristics of the drought of 2005 in Amazonia, one of the most severe in the last 100 years were assessed using a suite of seven regional models obtained from the CLARIS LPB project. The models were forced with the ERA-Interim reanalyses as boundary conditions. We used a combination of rainfall and temperature observations and the low-level circulation and evaporation fields from the reanalyses to determine the climatic and meteorological characteristics of this particular drought. The models reproduce in some degree the observed annual cycle of precipitation and the geographical distribution of negative rainfall anomalies during the summer months of 2005. With respect to the evolution of rainfall during 2004-2006, some of the models were able to simulate the negative rainfall departures during early summer of 2005 (December 2004 to February 2005). The interannual variability of rainfall anomalies for both austral summer and fall over northern and southern Amazonia show a large spread among models, with some of them capable of reproducing the 2005 observed negative rainfall departures (four out of seven models in southern Amazonia during DJF). In comparison, all models simulated the observed southern Amazonia negative rainfall and positive air temperature anomalies during the El Nino-related drought in 1998. The spatial structure of the simulated rainfall and temperature anomalies in DJF and MAM 2005 shows biases that are different among models. While some models simulated the observed negative rainfall anomalies over parts of western and southern Amazonia during DJF, others simulated positive rainfall departures over central Amazonia. The simulated circulation patterns indicate a weaker northeasterly flow from the tropical North Atlantic into Amazonia, and reduced flows from southern Amazonia into the La Plata basin in DJF, which is consistent with observations. In general, we can say that in some degree the regional models are able to capture the response to the forcing from the tropical Atlantic during the drought of 2005 in Amazonia. Moreover, extreme climatic conditions in response to anomalous low-level circulation features are also well captured, since the boundary conditions come from reanalysis and the models are largely constrained by the information provided at the boundaries. The analysis of the 2005 drought suggests that when the forcing leading to extreme anomalous conditions is associated with both local and non-local mechanisms (soil moisture feedbacks and remote SST anomalies, respectively) the models are not fully capable of representing these feedbacks and hence, the associated anomalies. The reason may be a deficient reproduction of the land-atmosphere interactions. © 2013 Springer-Verlag Berlin Heidelberg.
author Solman, Silvina Alicia
Pessacg, Natalia Liz
Carril, Andrea Fabiana
author_facet Solman, Silvina Alicia
Pessacg, Natalia Liz
Carril, Andrea Fabiana
author_sort Solman, Silvina Alicia
title Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
title_short Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
title_full Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
title_fullStr Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
title_full_unstemmed Simulation of rainfall anomalies leading to the 2005 drought in Amazonia using the CLARIS LPB regional climate models
title_sort simulation of rainfall anomalies leading to the 2005 drought in amazonia using the claris lpb regional climate models
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v41_n11-12_p2937_Marengo
http://hdl.handle.net/20.500.12110/paper_09307575_v41_n11-12_p2937_Marengo
work_keys_str_mv AT solmansilvinaalicia simulationofrainfallanomaliesleadingtothe2005droughtinamazoniausingtheclarislpbregionalclimatemodels
AT pessacgnatalializ simulationofrainfallanomaliesleadingtothe2005droughtinamazoniausingtheclarislpbregionalclimatemodels
AT carrilandreafabiana simulationofrainfallanomaliesleadingtothe2005droughtinamazoniausingtheclarislpbregionalclimatemodels
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