A5042017051- Groundwater and Isotope Geochemistry
- Climate variability and models
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Tropical and Extratropical Cyclones Research
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Botany and Geology in Latin America and Caribbean
- Plant Water Relations and Carbon Dynamics
- Geophysics and Gravity Measurements
- Water Treatment and Disinfection
- GNSS positioning and interference
- Meteorological Phenomena and Simulations
- Marine and coastal ecosystems
- Mass Spectrometry Techniques and Applications
- Coastal wetland ecosystem dynamics
- Soil Moisture and Remote Sensing
- Radioactive contamination and transfer
- Flood Risk Assessment and Management
- Groundwater and Watershed Analysis
- Water Quality and Pollution Assessment
- Transboundary Water Resource Management
- Peatlands and Wetlands Ecology
Universidad Nacional
2015-2024
The University of Texas at Arlington
2023
Lincoln University
2023
University of Cuenca
2019
The last 2014-16 El Niño event was among the three strongest episodes on record. considerably changes annual and seasonal precipitation across tropics. Here, we present a unique stable isotope data set of daily collected in Costa Rica prior to, during, after 2014-16, combination with Lagrangian moisture source anomaly diagnostics. δ2H composition ranged from -129.4 to +18.1 (‰) while δ18O -17.3 +1.0 (‰). No significant difference observed (P=0.186) (P=0.664) mean compositions. However,...
Abstract High‐elevation tropical grassland systems, called Páramo, provide essential ecosystem services such as water storage and supply for surrounding lowland areas. Páramo systems are threatened by climate land use changes. Rainfall generation processes moisture transport pathways influencing precipitation in the poorly understood but needed to estimate impact of these changes, particularly during El Niño conditions, which largely affect hydrometeorological conditions regions. To fill...
Abstract We present precipitation isotope data (δ 2 H and δ 18 O values) from 19 stations across the tropics collected 2012 to 2017 under Coordinated Research Project F31004 sponsored by International Atomic Energy Agency. Rainfall samples were daily analysed for stable isotopic ratios of oxygen hydrogen participating laboratories following a common analytical framework. also calculated mean stratiform rainfall area fractions around each station over an 5° x longitude/latitude based on...
The location of Costa Rica on the Central American Isthmus creates unique microclimate systems that receive moisture inputs directly from Caribbean Sea and Pacific Ocean. In Rica, stable isotope monitoring was conducted by International Atomic Energy Agency World Meteorological Association as part worldwide effort entitled Global Network Isotopes in Precipitation. Sampling campaigns were mainly comprised monthly-integrated samples during intermittent years 1990 to 2005. main goal this study...
Abstract Stable hydrogen, carbon, nitrogen, oxygen and sulfur (HCNOS) isotope compositions expressed as isotope-delta values are typically reported relative to international standards such Vienna Standard Mean Ocean Water (VSMOW), Peedee belemnite (VPDB) or Cañon Diablo Troilite (VCDT). These chosen by convention the calibration methods used realise them in practice undergo occasional changes. To ensure longevity reusability of published data, a comprehensive description (1) analytical...
Abstract Tracer‐aided studies to understand plant water uptake sources and dynamics in tropical ecosystems are limited. Here, we report the analysis of dry season source patterns five unique Costa Rica across altitudinal (<150–3,400 m asl) latitudinal (Caribbean Pacific slopes) gradients: evergreen seasonal rainforests, cloud forest, Páramo forest. Soil samples were collected during 2021. Plant soil extractions conducted using centrifugation. Stem extracted volume stem total content...
Potential anthropogenic shifts in the hydroclimate impacts of El Ni&#241;o Southern Oscillation (ENSO) extremes are poorly resolved by available data. Water isotopologues provide valuable tracers hydroclimatic processes, including balance precipitation versus evaporation and relative importance regional local drivers variability&#160; (Dee et al., 2023 references therein; Moerman 2013). However, very few water isotopologue datasets exist tropical Pacific, those that do fail to...
Industrial development has made new products available to people make their lives easier. Items such as food, cleaning, personal care and health products, among others, are processed, sold consumed daily by all age groups. These include in formulation inorganic organic chemicals with the purpose of improving or increasing some properties, making them more attractive consumer. substances strictly controlled during production so that final product may be safely consumed. In most cases,...
Abstract Tropical high‐elevation lakes are considered sentinels of global climate change. This work characterizes the hydrological conditions tropical alpine glacial located in highlands Chirripó, Costa Rica, using a unique data set water stable isotopes (δ 2 H and δ 18 O) precipitation, stream water, lake between September 2015 July 2017. A combined dataset bathymetric, hydrometric, isotope collected 2016 2017 on Lake Ditkevi was used to calculate annual balance lake. Evaporation inflow...
Tropical regions cover approximately 36% of the Earth's landmass. These are home to 40% world's population, which is projected increase over 50% by 2030 under a remarkable climate variability scenario often exacerbated El Niño Southern Oscillation (ENSO) and other teleconnections. In tropics, ecohydrological conditions typically influence complex land-ocean-atmosphere interactions that produce dynamic cycling mass energy reflected in clear partition water fluxes. Here, we present review...
Stable isotope ratios of nitrogen and oxygen (15N/14N 18O/16O) nitrate (NO3-) are excellent tracers for developing systematic understanding sources, conversions, deposition reactive atmospheric (Nr) in the environment. Despite recent analytical advances, standardized sampling NO3-) isotopes precipitation is still lacking. To advance studies on Nr species, we propose best-practice guidelines accurate precise analysis NO3- based experience obtained from an international research project...
The linkage between precipitation and recharge is still poorly understood in the Central America region. This study focuses on stable isotopic composition groundwater northern mountainous region of Valley Costa Rica. During dry season, rainfall samples corresponded to enriched events with high deuterium excess. By mid-May, Intertropical Convergence Zone poses over Rica resulting a depletion 18O/16O 2H/H ratios. A parsimonious four-variable regression model (r2 = 0.52) was able predict daily...
Numerous socio-economic activities depend on the seasonal rainfall and groundwater recharge cycle across Central American Isthmus. Population growth unregulated land use changes resulted in extensive surface water pollution a large dependency resources. This work combines stable isotope variations rainfall, water, of Costa Rica, Nicaragua, El Salvador, Honduras to develop regionalized isoscape, isotopic lapse rates, spatial–temporal variations, air mass back trajectories determining...
Abstract Knowledge about precipitation generation remains limited in the tropical Andes due to lack of water stable isotope (WSI) data. Therefore, we investigated key factors controlling isotopic composition Páramo highlands southern Ecuador using event-based (high frequency) WSI data collected between November 2017 and October 2018. Our results show that air masses reach study site preferentially from eastern flank through Amazon basin (73.2%), Orinoco plains (11.2%), Mato Grosso Massif...
Abstract Costa Rica is a nation with vast wealth of water resources; however, recently the country has faced conflicts (WC) due to social, economic, legal, and political impediments in response limited availability during El Niño events inefficient use its resources. This study presents spatial distribution temporal analysis WC from 2005 2015. In total, 719 were analyzed which 54% among private individuals government. The largest urban areas Grande de Tárcoles Basin identified as main “hot...
Abstract Dissolved organic carbon (DOC) transport and export from headwater forests into freshwaters in highly dynamic tropical catchments are still understudied. Here we present a DOC analysis (2017) pristine small (~2.6 km 2 ) catchment of Costa Rica. Storm flows governed rapid surface lateral allochthonous (62.2% the annual export). Cross‐correlation rainfall stream discharge indicated that occurred on average ~1.25 hr after maxima, with large contributions event water, ranging 42.4±0.3%...
Tropical peatlands are distributed mainly in coastal lowlands; however high elevation regions exhibit a large prevalence of small and fragmented that mostly understudied. Artificial drainage to expand the area cattle farming, horticulture, urbanization is increasing carbon losses atmosphere streams worldwide. Here, we present an exploratory characterization dissolved optical properties ombrotrophic peat bogs Talamanca range Costa Rica, across altitudinal gradient (2,400–3,100 m a.s.l.)...
Abstract Water resources management in the tropics is challenged by climate variability and unregulated land use change their impacts on complex interactions between vegetation, soil, atmosphere. This study focuses analysis of hydroclimatic ecohydrological conditions across 6 major biomes Costa Rica. Using Budyko Tomer–Schilling frameworks, 31 reanalysis data points located Caribbean Pacific domains were classified according to resistance resilience 1989 2005. Observed used evaluate...
Abstract Nitrate legacy is affecting groundwater sources across the tropics. This study describes isotopic and ionic spatial trends a tropical, fractured, volcanic multi‐aquifer system in central Costa Rica relation to land use change over four decades. Springs wells (from 800 2,400 m asl) were sampled for NO 3 − Cl concentrations, δ 18 O water , 15 N NO3 . A Bayesian isotope mixing model was used estimate potential source contributions nitrate groundwater. Land evaluated using satellite...
(2020). From mountains to cities: a novel isotope hydrological assessment of tropical water distribution system. Isotopes in Environmental and Health Studies: Vol. 56, applications Latin America the Carribean region, pp. 606-623.