How have daily climate extremes changed in the recent past over northeastern Argentina?

Lovino, Miguel A.; Müller, Omar V.; Berbery, Ernesto Hugo; Müller, Gabriela V.

doi:10.1016/j.gloplacha.2018.06.008

Cited by 40 publications

(40 citation statements)

References 70 publications

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“…This intensification has been pronounced for the uppermost percentiles (> 95th) of the frequency distributions of daily observations, suggesting larger rates of change for extreme hydro-meteorological events in these montane catchments. Similar results have been observed for northeastern Argentina, showing an increase in intense precipitation starting in 1970 (Lovino et al 2018). Segura et al (2020) have also observed the intensification of the precipitation over the southern tropical Andes (12°-20° S, > 3000 m asl) in the period 1982-2017, linking it to the strengthening of the upward motion (i.e., convection) over the western Amazon.…”

Section: Introductionsupporting

confidence: 76%

Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes

2020

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During the South-American Monsoon season, deep convective systems occur at the eastern flank of the Central Andes leading to heavy rainfall and flooding. We investigate the large- and meso-scale atmospheric dynamics associated with extreme discharge events (> 99.9th percentile) observed in two major river catchments meridionally stretching from humid to semi-arid conditions in the southern Central Andes. Based on daily gauge time series and ERA-Interim reanalysis, we made the following three key observations: (1) for the period 1940–2016 daily discharge exhibits more pronounced variability in the southern, semi-arid than in the northern, humid catchments. This is due to a smaller ratio of discharge magnitudes between intermediate (0.2 year return period) and rare events (20 year return period) in the semi-arid compared to the humid areas; (2) The climatological composites of the 40 largest discharge events showed characteristic atmospheric features of cold surges based on 5-day time-lagged sequences of geopotential height at different levels in the troposphere; (3) A subjective classification revealed that 80% of the 40 largest discharge events are mainly associated with the north-northeastward migration of frontal systems and 2/3 of these are cold fronts, i.e. cold surges. This work highlights the importance of cold surges and their related atmospheric processes for the generation of heavy rainfall events and floods in the southern Central Andes.

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Section: Introductionsupporting

confidence: 76%

Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes

2020

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“…Of immediate importance is the increased frequency and severity of heat waves occurring around the planet, exposing life to elevated, and often physiologically stressful, temperatures now more than ever before during the past 150 years (23,40). The hottest years on record since the mid-19th century have nearly all occurred within the past decade (38,77)…”

Section: Introductionmentioning

confidence: 99%

Heat Waves, the New Normal: Summertime Temperature Extremes Will Impact Animals, Ecosystems, and Human Communities

2019

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A consequence of climate change is the increased frequency and severity of extreme heat waves. This is occurring now as most of the warmest summers and most intense heat waves ever recorded have been during the past decade. In this review, I describe the ways in which animals and human populations are likely to respond to increased extreme heat, suggest how to study those responses, and reflect on the importance of those studies for countering the devastating impacts of climate change.

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“…A singular spectrum analysis (SSA, [29,30]) was applied to study the temporal variability of temperature and precipitation time series, including extreme events. The method determines the spatio-temporal structures of trends and quasi-oscillatory modes in time series (see details in [10]). SSA makes it possible to identify nonlinear long-term trends that describe the changes in temperature, precipitation, and extreme climate indices.…”

Section: Detecting Variability and Changes In Time Seriesmentioning

confidence: 99%

“…In this study, a subset of ETCCDI indices was computed for Rosario Aero data (see Table 1). Our analysis includes fourteen temperature-based and five precipitation-based indices as the most relevant for extreme events having greatest impact in northeastern Argentina (see [10]), where the study region is located. [37].…”

Section: Extreme Climate Indicesmentioning

confidence: 99%

“…The continuous increase in frequency and in intensity of heavy rainfall has caused great losses in agro-industrial production, severely damaged water management, and affected the urban centers in the region [8,9]. However, human activities are also impacted by increased occurrence of consecutive dry days, which lead to more seasonal droughts [10,11] as well as by extreme-maximum and minimum-temperature events, which have grown in frequency, intensity, and duration [12].…”

Section: Introductionmentioning

confidence: 99%

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Observed and Projected Changes in Temperature and Precipitation in the Core Crop Region of the Humid Pampa, Argentina

Müller

Lovino

Sgroi

2021

Climate

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The core crop region of the Humid Pampa is one of the most productive agricultural lands around the world and depends highly on climate conditions. This study assesses climate variability, climate extremes, and observed and projected climate changes there, using 1911–2019 observations and CMIP5 model simulations. Since 1970, the annual mean temperature has risen by 1 °C and the mean annual minimum and maximum temperatures by 2 and 0.5 °C, respectively. The frequency of warm days and nights increased, and cold days and nights decreased. Heatwaves became longer and more intense, and cold waves decreased with less frost events. Annual precipitation increased by 10% from 1911, mainly in summer, and years with excess precipitation outnumbered those with a deficit. Both intense precipitation events and consecutive dry days grew, suggesting more annual precipitation falling on fewer days. Projections show a warming of 1 ºC by 2035, regardless of the scenario. From then on until 2100, mean temperature will increase by 2 and 3–3.5 °C in the RCP4.5 and RCP8.5 scenarios, respectively. Annual precipitation will grow 8 and 16% from current values by 2100 in the RCP4.5 and RCP8.5 scenarios, respectively. No major precipitation changes are projected in the RCP2.6 scenario.

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How have daily climate extremes changed in the recent past over northeastern Argentina?

Cited by 40 publications

References 70 publications

Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes

Atmospheric dynamics of extreme discharge events from 1979 to 2016 in the southern Central Andes

Heat Waves, the New Normal: Summertime Temperature Extremes Will Impact Animals, Ecosystems, and Human Communities

Observed and Projected Changes in Temperature and Precipitation in the Core Crop Region of the Humid Pampa, Argentina

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