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Title: Precipitation extremes over La Plata Basin – Review and new results from observations and climate simulations

Abstract

Monthly and daily precipitation extremes over La Plata Basin (LPB) are analyzed in the framework of the CLARIS-LPB Project. A review of the studies developed during the project and results of additional research are presented and discussed. Specific aspects of analysis are focused on large-scale versus local processes impacts on the intensity and frequency of precipitation extremes over LPB, and on the assessment of specific wet and dry spell indices and their changed characteristics in future climate scenarios. The analysis is shown for both available observations of precipitation in the region and ad-hoc global and regional models experiments. The Pacific, Indian and Atlantic Oceans can all impact precipitation intensity and frequency over LPB. In particular, considering the Pacific sector, different types of ENSO events (i.e. canonical vs Modoki or East vs Central) have different influences. Moreover, model projections indicate an increase in the frequency of precipitation extremes over LPB during El Niño and La Ninã events in future climate. Local forcings can also be important for precipitation extremes. Here, the feedbacks between soil moisture and extreme precipitation in LPB are discussed based on hydric conditions in the region and model sensitivity experiments. Concerning droughts, it was found that they weremore » more frequent in the western than in the eastern sector of LPB during the period of 1962–2008. On the other hand, observations and model experiments agree in that the monthly wet extremes were more frequent than the dry extremes in the northern and southern LPB sectors during the period 1979–2001, with higher frequency in the south.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1342897
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Hydrology; Journal Volume: 523; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; La Plata Basin; Large-scale features; Model simulations; Precipitation extremes; Soil moisture; South America

Citation Formats

Cavalcanti, I. F. A., Carril, A. F., Penalba, O. C., Grimm, A. M., Menéndez, C. G., Sanchez, E., Cherchi, A., Sörensson, A., Robledo, F., Rivera, J., Pántano, V., Bettolli, L. M., Zaninelli, P., Zamboni, L., Tedeschi, R. G., Dominguez, M., Ruscica, R., and Flach, R.. Precipitation extremes over La Plata Basin – Review and new results from observations and climate simulations. United States: N. p., 2015. Web. doi:10.1016/j.jhydrol.2015.01.028.
Cavalcanti, I. F. A., Carril, A. F., Penalba, O. C., Grimm, A. M., Menéndez, C. G., Sanchez, E., Cherchi, A., Sörensson, A., Robledo, F., Rivera, J., Pántano, V., Bettolli, L. M., Zaninelli, P., Zamboni, L., Tedeschi, R. G., Dominguez, M., Ruscica, R., & Flach, R.. Precipitation extremes over La Plata Basin – Review and new results from observations and climate simulations. United States. doi:10.1016/j.jhydrol.2015.01.028.
Cavalcanti, I. F. A., Carril, A. F., Penalba, O. C., Grimm, A. M., Menéndez, C. G., Sanchez, E., Cherchi, A., Sörensson, A., Robledo, F., Rivera, J., Pántano, V., Bettolli, L. M., Zaninelli, P., Zamboni, L., Tedeschi, R. G., Dominguez, M., Ruscica, R., and Flach, R.. Wed . "Precipitation extremes over La Plata Basin – Review and new results from observations and climate simulations". United States. doi:10.1016/j.jhydrol.2015.01.028.
@article{osti_1342897,
title = {Precipitation extremes over La Plata Basin – Review and new results from observations and climate simulations},
author = {Cavalcanti, I. F. A. and Carril, A. F. and Penalba, O. C. and Grimm, A. M. and Menéndez, C. G. and Sanchez, E. and Cherchi, A. and Sörensson, A. and Robledo, F. and Rivera, J. and Pántano, V. and Bettolli, L. M. and Zaninelli, P. and Zamboni, L. and Tedeschi, R. G. and Dominguez, M. and Ruscica, R. and Flach, R.},
abstractNote = {Monthly and daily precipitation extremes over La Plata Basin (LPB) are analyzed in the framework of the CLARIS-LPB Project. A review of the studies developed during the project and results of additional research are presented and discussed. Specific aspects of analysis are focused on large-scale versus local processes impacts on the intensity and frequency of precipitation extremes over LPB, and on the assessment of specific wet and dry spell indices and their changed characteristics in future climate scenarios. The analysis is shown for both available observations of precipitation in the region and ad-hoc global and regional models experiments. The Pacific, Indian and Atlantic Oceans can all impact precipitation intensity and frequency over LPB. In particular, considering the Pacific sector, different types of ENSO events (i.e. canonical vs Modoki or East vs Central) have different influences. Moreover, model projections indicate an increase in the frequency of precipitation extremes over LPB during El Niño and La Ninã events in future climate. Local forcings can also be important for precipitation extremes. Here, the feedbacks between soil moisture and extreme precipitation in LPB are discussed based on hydric conditions in the region and model sensitivity experiments. Concerning droughts, it was found that they were more frequent in the western than in the eastern sector of LPB during the period of 1962–2008. On the other hand, observations and model experiments agree in that the monthly wet extremes were more frequent than the dry extremes in the northern and southern LPB sectors during the period 1979–2001, with higher frequency in the south.},
doi = {10.1016/j.jhydrol.2015.01.028},
journal = {Journal of Hydrology},
number = C,
volume = 523,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}