Characteristics of large-scale atmospheric circulation related to extreme monthly rainfall anomalies in the Pampa Region, Argentina, under non-ENSO conditions

Scian, Beatriz Viviana; Labraga, Juan Carlos; Reimers, W.; Frumento, Oscar Andrés

doi:10.1007/s00704-005-0182-8

Cited by 32 publications

(24 citation statements)

References 16 publications

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“…The ENSO negative (El Niño) and positive phases (La Niña) were related to rainfall and Sea Surface Temperature (SST) anomalies in the main oceanic currents (Brazil and Malvinas). Several studies have related, for the Buenos Aires province, the occurrence of extreme wet (dry) events with negative (positive) ENSO phases [9][10][11][12][13]. Phytoplankton blooms are the main sign of enhancement of the pelagic activity [14], and their occurrence is tightly related to biogeochemical fluctuations in sea water, and the variability in the annual recruitment of fishes (e.g., [15,16]).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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Abstract:The aim of this study is to describe and understand the seasonal and inter-annual physical and biological dynamics of the inner and mid shelves of the Southwestern Buenos Aires Province (Argentina). We used chlorophyll-a (chl-a) concentrations and inherent optical properties (IOPs), derived from ocean color products between 2002 and 2010, as a proxy for the physical and biological parameters of interest. This study focuses on the absorption by phytoplankton, aph(443), particulate backscattering, bbp(443), and absorption due to dissolved and particulate detrital matter, adg (443), and chl-a derived from a multiband quasi-analytical algorithm (QAA). A regionalization based on the coefficient of variation and the Census X-11 method were applied to define regions and to analyze the inter-annual and seasonal variability of the ocean color parameters, with regards to climate OPEN ACCESSRemote Sens. 2015, 7 11822 variability. The coastal zone presents the highest values of chl-a with two maxima in winter and autumn, while the mid-shelf shows a strong spring chl-a maximum. After 2009, all parameters under study shifted their seasonality and their magnitude changed over the entire area. In the coastal zone, mean values of aph(443) and bbp(443) increased, while in the mid-shelf, chl-a and aph(443) decreased. The observed inter-annual and seasonal behavior of the parameters is tightly related to climate variability of the study area.

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Section: Introductionmentioning

confidence: 99%

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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“…Annual rainfall decreases from 1000 mm in the NE to 800 mm in the SW (see Fig. 1C), although inter-annual variability of rainfall is quite frequent in the Pampas with extensive rainfall or drought (Labraga et al, 2002;Scian et al, 2006). According to data provided by the Servicio Meteorológico Nacional of Argentina (SMN, Exp_144540), the first year of our study was considered as a normal period (%800-900 mm, see Fig.…”

Section: Study Areamentioning

confidence: 99%

Burrowing activity by armadillos in agroecosystems of central Argentina: Biogeography, land use, and rainfall effects

Abba

Zufiaurre

Codesido

et al. 2015

Agriculture, Ecosystems & Environment

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“…They concluded that El Niño–Southern Oscillation (ENSO) could be responsible for most of the interannual variability during the summer season. Nevertheless, in 2006 an interesting paper 18 showed that central‐eastern Argentina experienced severe drought and wet conditions during the last decades under non‐ENSO years. A dipolar structure of SST anomalies has also been shown to accompany interannual intensification of the SACZ over the southwestern Atlantic 19 .…”

Section: Climatic Descriptionmentioning

confidence: 99%

Daily Rainfall Variability over Northeastern Argentina in the La Plata River Basin

García

Pedraza

2008

Annals of the New York Academy of Sciences

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We did a brief description of the climatic behavior and after this we analyzed the temporal variation in the total number of days a year with rainfall and the number of days a year with rainfall above the 100 mm threshold at the rain gauging stations in northeastern Argentina south of the La Plata River basin. The results show an increase both in the frequency of daily rainfall, especially during the winter season, and the frequency of days with heavy rainfall starting in the early 1970s. The increase in frequency of occurrence is more significant in the case of heavy rainfall. The annual maximum rainfall was calculated for periods of 1, 3, 5, 7, and 10 consecutive days at regional rain gauging stations for the respective historical periods, and the rain intensity-duration-return period curves (IDT) were determined on a frequency analysis. The IDT curves were compared with rainfall intensity-duration data of critical storms occurring in the last decades. We noticed that the rain intensities of critical storms (mostly convective) widely exceeded the intensities given by the 100-year IDT curves, particularly for short durations. The increase in both the frequency of heavy rainfall occurrence and rain intensity from the 1970s onward shows an increase in frequency and intensity of the meso-scale convective systems in the region resulting from climatic change. These systems tend to produce rainfall of very high intensity that is spatially concentrated and which generally produces significant floods in the local rivers.

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Characteristics of large-scale atmospheric circulation related to extreme monthly rainfall anomalies in the Pampa Region, Argentina, under non-ENSO conditions

Cited by 32 publications

References 16 publications

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Burrowing activity by armadillos in agroecosystems of central Argentina: Biogeography, land use, and rainfall effects

Daily Rainfall Variability over Northeastern Argentina in the La Plata River Basin

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