Preface to stable isotopes in hydrological studies in the tropics: Ecohydrological perspectives in a changing climate

Sánchez‐Murillo, Ricardo; Durán-Quesada, Ana María

doi:10.1002/hyp.13305

Cited by 7 publications

(7 citation statements)

References 32 publications

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“…Robust and up‐to‐date hydrological information is required for stakeholders and governmental agencies to prioritize efforts, resources, and regulations in watersheds or regions, whereby potential droughts or extreme rainfall events could drastically disrupt ecohydrological assemblages. However, in the absence of well‐established and long‐term hydrometric networks in Central America, water stable isotopes are a reliable, fast, and relatively low‐cost technique to study the interaction between rainfall inputs and surface/groundwater connectivity in complex tropical landscapes (Sánchez‐Murillo & Durán‐Quesada, 2018).…”

Section: Introductionmentioning

confidence: 99%

Tracer hydrology of the data‐scarce and heterogeneous Central American Isthmus

Sánchez‐Murillo

Esquivel‐Hernández

Castro‐Chacón³

et al. 2020

Hydrological Processes

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Numerous socio-economic activities depend on the seasonal rainfall and groundwater recharge cycle across the Central American Isthmus. Population growth and unregulated land use changes resulted in extensive surface water pollution and a large dependency on groundwater resources. This work combines stable isotope variations in rainfall, surface water, and groundwater of Costa Rica, Nicaragua, El Salvador, and Honduras to develop a regionalized rainfall isoscape, isotopic lapse rates, spatial-temporal isotopic variations, and air mass back trajectories determining potential mean recharge elevations, moisture circulation patterns, and surface watergroundwater interactions. Intra-seasonal rainfall modes resulted in two isotopically depleted incursions (W-shaped isotopic pattern) during the wet season and two enriched pulses during the mid-summer drought and the months of the strongest trade winds. Notable isotopic sub-cloud fractionation and near-surface secondary evaporation were identified as common denominators within the Central American Dry Corridor. Groundwater and surface water isotope ratios depicted the strong

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Section: Introductionmentioning

confidence: 99%

Tracer hydrology of the data‐scarce and heterogeneous Central American Isthmus

Sánchez‐Murillo

Esquivel‐Hernández

Castro‐Chacón³

et al. 2020

Hydrological Processes

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“…One of the applications of the use of isotopes is to determine their composition during precipitation, more specifically with the performance of synoptic scale events, enabling the tracking of moisture that contributes to their formation [7][8][9]. In addition, this application can serve as a useful tool for validating atmospheric models [10] and for a better understanding of isotopic values in the tropical region [11].…”

Section: Introductionmentioning

confidence: 99%

Isotopic Composition of Precipitation in a Southeastern Region of Brazil during the Action of the South Atlantic Convergence Zone

et al. 2021

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The use of stable isotopes of hydrogen and oxygen is a tool widely used to trace water paths along the hydrological cycle, providing support for understanding climatic conditions in different spatial scales. One of the main synoptic scale events acting in southeastern Brazil is the South Atlantic Convergence Zone (SACZ), which causes a large amount of precipitation from southern Amazonia to southeastern Brazil during the southern summer. In order to determine the isotopic composition of precipitation during the action of SACZ in São Francisco Xavier in southeastern Brazil, information from the Weather Forecasting and Climate Studies Center of the National Institute for Space Research (CPTEC) was used regarding SACZ performance days, the retrograde trajectories of the HYSPLIT model, and images from the GOES-16 satellite, in addition to the non-parametric statistical tests by Spearman and Kruskal–Wallis. A high frequency of air mass trajectories from the Amazon to southeastern Brazil was observed when the SACZ was operating. During the SACZ events, the average isotopic composition of precipitation was more depleted, with a δ18O of −9.9‰ (±2.1‰), a δ2H of −69.3‰ (±17.9‰), and d-excess of 10.1‰ (±4.0‰). When disregarding the SACZ performance, the annual isotopic composition can present an enrichment of 1.0‰ for δ18O and 8.8‰ for the δ2H. The long-term monitoring of trends in the isotopic composition of precipitation during the SACZ events can assist in indicating the evapotranspiration contribution of the Amazon rainforest to the water supply of southeastern Brazil.

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“…Stable isotopes studies in the tropics have frequently been constrained by numerous limitations, such as site remoteness, accessibility disruptions during extreme weather, interrupted monitoring (i.e., lack of consistent long-term time series), insufficient local funding, and a variety of socio-economic and political challenges (Landholm et al, 2019;Lee et al, 2019). The latter, in large degree, limits the reliability and robustness of temporal and spatial isotopic assessments (Sánchez- Murillo and Durán-Quesada, 2019). Beyond the lack of scientific information, factors such as rapid population growth, abrupt land use changes (i.e., agricultural, urban development, and mining land expansion), and a large dependency on groundwater exploitation are severely affecting water security and sustainability (Barrow, 2016;Hund et al, 2018;Roberts et al, 2018) across the tropics.…”

Section: Introductionmentioning

confidence: 99%

Tracing Water Sources and Fluxes in a Dynamic Tropical Environment: From Observations to Modeling

et al. 2020

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Tropical regions cover approximately 36% of the Earth's landmass. These regions are home to 40% of the world's population, which is projected to increase to over 50% by 2030 under a remarkable climate variability scenario often exacerbated by El Niño Southern Oscillation (ENSO) and other climate teleconnections. In the tropics, ecohydrological conditions are typically under the influence of complex land-oceanatmosphere interactions that produce a dynamic cycling of mass and energy reflected in a clear partition of water fluxes. Here, we present a review of 7 years of a concerted and continuous water stable isotope monitoring across Costa Rica, including key insights learned, main methodological advances and limitations (both in experimental designs and data analysis), potential data gaps, and future research opportunities with a humid tropical perspective. The uniqueness of the geographic location of Costa Rica within the mountainous Central America Isthmus, receiving moisture inputs from the Caribbean Sea (windward) and the Pacific Ocean (complex leeward topography), and experiencing strong ENSO events, poses a clear advantage for the use of isotopic variations to underpin key drivers in ecohydrological responses. In a sequential approach, isotopic variations are analyzed from moisture transport, rainfall generation, and groundwater/surface connectivity to Bayesian and rainfall-runoff modeling. The overarching goal of this review is to provide a robust humid tropical example with a progressive escalation from common water isotope observations to more complex modeling outputs and applications to enhance water resource management in the tropics.

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Preface to stable isotopes in hydrological studies in the tropics: Ecohydrological perspectives in a changing climate

Cited by 7 publications

References 32 publications

Tracer hydrology of the data‐scarce and heterogeneous Central American Isthmus

Tracer hydrology of the data‐scarce and heterogeneous Central American Isthmus

Isotopic Composition of Precipitation in a Southeastern Region of Brazil during the Action of the South Atlantic Convergence Zone

Tracing Water Sources and Fluxes in a Dynamic Tropical Environment: From Observations to Modeling

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