The impact of El Niño on South American summer climate during different phases of the Pacific Decadal Oscillation

Silva, Gyrlene Aparecida Mendes da; Drumond, Anita; Ambrizzi, Tércio

doi:10.1007/s00704-011-0427-7

Cited by 51 publications

(39 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance, the already enhanced precipitation and streamflow in eastern Australia have been demonstrated to be even further magnified during La Niña events that occurred in the PDO/IPO (Interdecadal Pacific Oscillation) cool phase (Verdon et al, 2004). Additionally, the precipitation patterns showed different responses in El Niño periods for southeastern South America and Myanmar during PDO warm/cool phases (Silva et al, 2011;Sen Roy and Sen Roy, 2011). These studies indicated that the in-phase/out-of-phase relationships of ENSO and PDO usually have distinct effects on precipitation and streamflow in different regions, and thus, discussions considering the influences of ENSO in association with PDO are necessary.…”

Section: R Ouyang Et Al: Linkages Between Enso/pdo Signals and Precmentioning

confidence: 99%

Linkages between ENSO/PDO signals and precipitation, streamflow in China during the last 100 years

Ouyang

Liu

et al. 2014

Hydrol. Earth Syst. Sci.

156

View full text Add to dashboard Cite

Abstract. This paper investigates the single and combined impacts of El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) on precipitation and streamflow in China over the last century. Results indicate that the precipitation and streamflow overall decrease during El Niño/PDO warm phase periods and increase during La Niña/PDO cool phase periods in the majority of China, although there are regional and seasonal differences. Precipitation and streamflow in the Yellow River basin, Yangtze River basin and Pearl River basin are more significantly influenced by El Niño and La Niña events than is precipitation and streamflow in the Songhua River basin, especially in October and November. Moreover, significant influence of ENSO on streamflow in the Yangtze River mainly occurs in summer and autumn while in the Pearl River influence primarily occurs in the winter and spring. The precipitation and streamflow are relatively greater in the warm PDO phase in the Songhua River basin and several parts of the Yellow River basin and relatively less in the Pearl River basin and most parts of Northwest China compared to those in the cool PDO phase, though there is little significance detected by Wilcoxon signed-rank test. When considering the combined influence of ENSO and PDO, the responses of precipitation/streamflow are shown to be opposite in northern China and southern China, with ENSO-related precipitation/streamflow enhanced in northern China and decreased in southern China during the warm PDO phases, and enhanced in southern China and decreased in northern China during the cool PDO phases. It is hoped that this study will be beneficial for understanding the precipitation/streamflow responses to the changing climate and will correspondingly provide valuable reference for water resources prediction and management across China.

show abstract

Section: R Ouyang Et Al: Linkages Between Enso/pdo Signals and Precmentioning

confidence: 99%

Linkages between ENSO/PDO signals and precipitation, streamflow in China during the last 100 years

Ouyang

Liu

et al. 2014

Hydrol. Earth Syst. Sci.

156

View full text Add to dashboard Cite

show abstract

“…If local evaporation during these events is not unusually intense, the transport of water vapor from distant regions by the atmospheric circulation should be a vital moisture source. Such remote transport has been reported in the case of tropical and extratropical cyclogenesis [e.g., Lee , ; Silva et al , ] and should be a plausible mechanism to provide the necessary moisture source for southwestern South Atlantic SC under conditions of relatively cold SST.…”

Section: Introductionmentioning

confidence: 99%

Climatology and numerical case study of moisture sources associated with subtropical cyclogenesis over the southwestern Atlantic Ocean

et al. 2017

View full text Add to dashboard Cite

An important feature during cyclogenesis is the availability of moisture to fuel the associated convective activity providing faster developments and more intense systems. In this work, an investigation of the role of local evaporation and remote water vapor transport prior to subtropical cyclogenesis in the southwestern South Atlantic (named RG1 region) is presented. Results were obtained analyzing the period from 1980 to 2015 with a Lagrangian particle dispersion model together with the ERA‐Interim reanalysis. The northern sector of the Subtropical High in the South Atlantic Ocean stands out as the main source region of water vapor to the RG1, with the low‐level northeasterly winds being responsible by moisture transport. An anomalous moisture transport from lower latitudes preceded the subtropical cyclogenesis events and provided the necessary water vapor to fuel the convective activity. A numerical case study using the Weather Research and Forecasting mesoscale model indicated that the remote moisture source is essential for subtropical cyclogenesis in RG1, since it allows a stronger surface low pressure to develop and supports the formation of a cutoff low in the middle troposphere. Though the local evaporation has a secondary role in this process, it helped the system to attain the observed intensity and subtropical characteristics. Therefore, both local and remote moisture sources provide the incipient subtropical cyclone with the horizontal temperature advection and convective activity necessary to its further development.

show abstract

“…Some physical and dynamical causes of the summer rainfall increase have been attributed to the ENSO signal in those cases when ENSO and PDO are in the same phase (Kayano and Andreoli, 2007). Recent studies by Silva et al (2011) have pointed out that the impact of EN events during positive PDO(+) phases affects the transport of moisture and extratropical cyclonic properties in austral summer over southeastern South America. The changes in tropical-extratropical circulation anomalies after 1976 seem to be associated with an increase in the frequency and intensity of EN events and positive precipitation anomalies.…”

Section: Discussionmentioning

confidence: 99%

“…Silva et al (2011) focused on the impact of ENSO events during positive PDO(+) and negative PDO(−) phases on transport of moisture and extratropical cyclonic properties in austral summer over South America. These authors suggest that changes in tropical/extratropical circulation anomalies over South America after 1976 seem to be associated with an increase in the frequency and intensity of El Niño (EN) events.…”

Section: Introductionmentioning

confidence: 99%

Variability and trends of extreme dry and wet seasonal precipitation in Argentina. A retrospective analysis

Scian¹,

Pierini²

2013

Atmósfera

View full text Add to dashboard Cite

RESUMENSe analiza la variabilidad de la precipitación estacional en sus valores medios y extremos para varias regiones de Argentina al norte de 39º S, empleando series mensuales de lluvia que se extienden desde 1860 hasta 2006. Las estaciones seleccionadas pueden considerarse representativas de diferentes regiones climáticas del país. El análisis se focaliza en la distribución de la lluvia, la tendencia estacional, los cambios en la varianza y los valores extremos, a fin de establecer la magnitud de la variabilidad climática estacional de las lluvias en una perspectiva histórica en el centro de Argentina. Los valores extremos se calcularon para una ventana móvil de 40 años definiendo estos valores para los niveles mayores/menores a los percentiles 80/20 (p = 0.80/0.20; 0.90/0.10; 0.95/0.05) de la distribución teórica gamma, seleccionada entre otras cinco distribuciones. Los parámetros de escala y forma de la distribución se calcularon empleando la estimación de máxima verosimilitud (MLE) y el método de remuestreo (bootstraping) para 1000 repeticiones. Las tendencias estacionales se calcularon para cada ventana, al igual que su significación estadística. El uso de una ventana móvil permitió establecer el periodo de cuatro décadas en el cual se verificó el mayor valor de la tendencia, ya sea positiva o negativa. De los resultados se desprende que hubo desplazamientos en las distribuciones de lluvia estacional así como cambios en los valores de retorno (RV) que se calcularon para una ocurrencia de una vez cada 5, 10 y 20 años. En general, las lluvias extremas de verano se incrementaron para toda la región. Los valores extremos húmedo/seco (W/D) de la estación estival correspondientes a los percentiles 90/10 para W/D, respectivamente, sufrieron incrementos significativos de acuerdo con la zona geográfica y el periodo. Sin embargo, se menciona como rasgo particular del verano la existencia de un periodo común a todas las estaciones con tendencias positivas, que se inicia con la ventana 1921-1960 y permanece hasta la última ventana analizada: 1967-2006. Este comportamiento no se observa en la estación de invierno para el oeste y centro de Argentina excepto en la zona representada por Bahía Blanca, para la cual el extremo D (del 10%) se incrementó a lo largo de todo el periodo de estudio. ABSTRACTThe variability in seasonal mean and extreme precipitation is analyzed for several regions of Argentina to the north of 39º S, using long-term monthly time series data which expand from 1860 to 2006. The selected locations can be considered as representative of different climatic regions. This work focuses on the analysis 4 B. Scian and J. Pierini of monthly rainfall distribution, significant seasonal trends, changes in variance and extreme monthly values, in order to establish the magnitude of the seasonal climatic rainfall variability through time for central Argentina. A 40-yr moving window was employed in order to analyze seasonal variability of rainfall extremes. Extremes were computed for different probability levels of ...

show abstract

The impact of El Niño on South American summer climate during different phases of the Pacific Decadal Oscillation

Cited by 51 publications

References 44 publications

Linkages between ENSO/PDO signals and precipitation, streamflow in China during the last 100 years

Linkages between ENSO/PDO signals and precipitation, streamflow in China during the last 100 years

Climatology and numerical case study of moisture sources associated with subtropical cyclogenesis over the southwestern Atlantic Ocean

Variability and trends of extreme dry and wet seasonal precipitation in Argentina. A retrospective analysis

Contact Info

Product

Resources

About