Multi-annual response of a Pampean shallow lake from central Argentina to regional and large-scale climate forcings

Guerra, Lucía; Martini, Mateo A.; Córdoba, Francisco; Ariztegui, Daniel; Piovano, Eduardo L.

doi:10.1007/s00382-018-4548-x

Cited by 8 publications

(3 citation statements)

References 69 publications

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“…Sin embargo, al analizar la respuesta de las áreas cubiertas de agua a los eventos extremos de categoría fuerte y muy fuerte, la asociación del índice ONI a escala de variabilidad de año a año (Figura 4), es relevante. Estos resultados muestran la situación inversa a la hallada para la laguna Melincué (Guerra et al, 2012), para la cual se hallaron correlaciones positivas con el índice ONI para un período de tiempo extenso mientras que, eventos El Niño intensos no fueron seguidos inmediatamente por un aumento del área del lago. Esto podría atribuirse, en principio, a la diferencia en la longitud del período estudiado ya que, para el lago Melincué, el período de estudio alcanzó los 60 años de datos.…”

Section: Resultados Y Discusión 31 Desarrollo De La Propuesta Metodounclassified

Methodologic Proposal for Shallow Lakes Floods Prediction on Plains (Buenos Aires Province, Argentina)

Bohn

2020

Anuário IGEO UFRJ

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ResumoO objetivo desta pesquisa é desenvolver um método de trabalho através da integração de dados climáticos e por satélite para a previsibilidade de inundações das lagoas nas regiões de planície. Foram analisados dois índices climáticos: O Índice Oceânico do El Niño (ONI) e Índice de precipitação padronizada e Evapotranspiração (SPEI) em relação às extensões (km 2 ) de água de superfície na área de estudo durante um período de 18 anos. A série de dados climáticos e por satélite foram obtidos de forma modelada e através de processamento digital, respectivamente, e foram analisadas utilizando matrizes de correlação e covariância. Como resultado obteve-se que o índice SPEI, em relação às alterações na cobertura de água, apresenta maior ajuste em uma escala de 18 meses, enquanto não houve relação significativa entre os dados do satélite e o índice de ONI. Essa determinação foi validada comparando-se as extensões de cobertura de água na área estudada durante os períodos categorizados como normais e muito úmidos (de acordo com o SPEI, aos 18 meses de escala). Como resultado, obteve-se que, de fato, a área coberta por água foi maior (~51%) durante o período úmido. Isso conclui que as variações nas áreas da lagoa, bem como o desenvolvimento de novos corpos de água intermitente, têm um tempo de resposta de 18 meses para o índice climático analisado. Essas determinações, tendo em conta que a série de dados SPEI exigem apenas a disponibilidade de dados de precipitação e temperatura e estão disponíveis globalmente (de forma modelada), constituem uma ferramenta eficaz para a previsibilidade de inundações em lagoas. Palavras-chave: cobertura de água; tempo de resposta; índices climáticos AbstractThis work aimed to integrate climatological and satellite data to predict floods and the areal increase of shallow lakes in a plain region (Buenos Aires province, Argentina). Two climatological indexes were analyzed: Oceanic Niño Index (ONI) and Standardized Precipitation Evapotranspiration Index (SPEI) in relation with areal extensions (km 2 ) of surface water in the study area during a period of 18 years. The climatological and satellite data series were obtained from published databases and by satellite image processing, respectively. They were analyzed by correlation and covariance matrix. As a result, there was obtained that the SPEI index showed the highest correlation with the surface water, in 18 months temporal scale whereas there was not a significant relation between satellite and ONI data. This determination was validated by the comparison between the waters covers, for the same LANDSAT scene, during regular and wet periods (by SPEI, 18 months temporal scale). As a result, there was obtained that, effectively, the area covered by water was higher (~ 51 %) during the extremely wet period for all the study area. As a conclusion, we found that the areal shallow lake variations, as well as the development of new water bodies, showed a response time of 18 months concerning the climatological variables. Those determinations are...

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Section: Resultados Y Discusión 31 Desarrollo De La Propuesta Metodounclassified

Methodologic Proposal for Shallow Lakes Floods Prediction on Plains (Buenos Aires Province, Argentina)

Bohn

2020

Anuário IGEO UFRJ

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“…MC is the most extensive saline lake in South America, with a maximum area during high water level of 6,000 km 2 (Bucher, 2019). During the twentieth‐century, MC has undergone hydrologic changes through abrupt lake level fluctuations, recording significant increases in water level from the early 1970s until the mid‐1980s (Bucher & Stein, 2016; Guerra et al., 2019; Troin et al., 2010). During extended dry periods, its surface can be reduced to less than 2,000 km 2 through retreating shorelines (Troin et al., 2010).…”

Section: Mar Chiquita Saline Lake and The Pampasmentioning

confidence: 99%

Is Dust Derived From Shrinking Saline Lakes a Risk to Soil Sodification in Southern South America?

et al. 2022

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Dry lakebeds exposed by shrinking water bodies in arid regions constitute sodium (Na)‐rich mineral dust emission hotspots that may potentially affect agriculture through soil sodification. However, no soluble Na mass balance has so far been attempted. We modeled 13 years (2005–2017) of dust emission from Mar Chiquita (MC), the most extensive shrinking saline lake in South America. Based on a chemical characterization of dust, we found that a mean ∼15–150 mg m−2 of soluble Na was deposited 300 km from the source during the season of strongest dust emissions. We estimated the impact of this atmospheric input on 13 agricultural soils, with different rainfall regimes and water holding capacities. At most sites, dust‐equilibrated infiltrated rainfall water had a Na concentration 8–7,000 times lower than the lowest concentration threshold proposed to trigger sodification. Additionally, this rainfall water is diluted ∼2–20 times as it infiltrates in saturated soils, and its sodium adsorption ratio is probably reduced due to the abundance of soluble calcium and magnesium in the soil solution. Thus, there is no risk of short‐term, seasonal sodification, except possibly at two sites and in close proximity to the dust source (<50 km), where dust deposition is maximum. At these sites, we estimated potential dust‐related rises in the proportion of soil exchangeable Na. Under scenarios of enhanced salt‐rich dust emissions from shrinking lakes in the twenty‐first century, agricultural soils close to salt‐rich dust sources worldwide should be monitored for potential Na enrichment related to Na‐rich dust.

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“…The long-term hydrological variability of the aquatic systems of SESA is related to different climate variability modes i.e., ENSO, Southern Annular Mode (SAM), Paci c Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO), rainfall and winds (Guerra et al 2019;Perez et al 2021 a, b). Such natural changes are often di cult to discriminate since hydroclimatic drivers would force similar cycles along the SESA, but the responses of the system and the nal sedimentary expression may be different depending on the erosion rate of the basin soils (Cordoba et.…”

Section: Introductionmentioning

confidence: 99%

Late Holocene lake level changes are modulated by centennial hydroclimatic variability of southeastern South America, a case study of Laguna de las Nutrias, Uruguay

Perez,

Cuña-Rodríguez,

Córdoba

et al. 2023

Preprint

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Laguna de las Nutrias is a small/enclosed shallow lake located within an environmentally protected area under negligible anthropogenic impact in Southeastern South America (SESA). It holds a high-resolution sedimentary record that allowed us to infer the hydrological response to the regional climatic variability during the last 700 year linked to different climate variability modes. We performed 2 mm-µXRF-scanning analyses on an 88-cm long sediment core, which was dated by both 14C and 210Pb techniques. We utilized Ti/Al, Ti/Ca, Fe/Mn, Ti/K, S/Ti, Br/Ti, and Si/Ti as proxies for catchment runoff, lake level, redox conditions, grain size, organic matter, storms/extreme events, and trophic state, respectively. The lowest sedimentation rate, lake level, runoff values, highest trophic state and grain size were recorded between 1360–1800 CE, assigned to the Little Ice Age (LIA), under low humidity conditions related to the weakening of the South American Low-Level Jet (SALLJ). Subsequently, the highest sedimentation rate values, runoff and lake level were recorded up to the present. Concomitant lowest trophic state conditions were inferred and interpreted as dilution processes associated with higher lake levels. This stage was assigned to the onset of the Current Warm Period (CWP), which was characterized by higher humidity conditions leading to the highest sedimentation rate, lake level and runoff values after 1980 CE, associated with the noticeable increase in rainfall during “1970´s climatic shift”. By performing time series analyses, we determined centennial, multi-decadal, decadal, and inter-annual cyclicity in lake level related to the hydroclimatic variability. Furthermore, a high significant positive/negative Spearman correlation was observed between runoff and lake level/trophic state proxies and the El Niño Southern Oscillation (ENSO) reconstruction. ENSO modulates both long and short-term frequency of SALLJ, leading to an increase in rainfall during positive phases, which determined high lake level and runoff and a decreased trophic state due to dilution processes. The reconstructed hydrological variability herein is synchronic with other SESA lacustrine systems and the increased Rio de la Plata discharge, indicating similar long-term limnological responses to the regional climatic patterns.

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Multi-annual response of a Pampean shallow lake from central Argentina to regional and large-scale climate forcings

Cited by 8 publications

References 69 publications

Methodologic Proposal for Shallow Lakes Floods Prediction on Plains (Buenos Aires Province, Argentina)

Methodologic Proposal for Shallow Lakes Floods Prediction on Plains (Buenos Aires Province, Argentina)

Is Dust Derived From Shrinking Saline Lakes a Risk to Soil Sodification in Southern South America?

Late Holocene lake level changes are modulated by centennial hydroclimatic variability of southeastern South America, a case study of Laguna de las Nutrias, Uruguay

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