A5083275587- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Plant and soil sciences
- Cryospheric studies and observations
- Plant Physiology and Cultivation Studies
- Mercury impact and mitigation studies
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Forest ecology and management
- Impact of Light on Environment and Health
- Latin American Urban Studies
- Climate variability and models
- Precipitation Measurement and Analysis
- Climate Change and Health Impacts
- Tree-ring climate responses
- COVID-19 impact on air quality
- Seedling growth and survival studies
- Plant Surface Properties and Treatments
- Historical and socio-economic studies of Spain and related regions
- Geography and Environmental Studies in Latin America
Higher University of San Andrés
2010-2024
Leibniz Institute for Tropospheric Research
2017
Mobility particle size spectrometers (MPSS) belong to the essential instruments in aerosol science that determine number distribution (PNSD) submicrometer range. Following calibration procedures and target uncertainties against standards reference are suggested for a complete MPSS quality assurance program: (a) of CPC counting efficiency curve (within 5% plateau efficiency; within 1 nm 50% detection diameter), (b) sizing MPSS, using certified polystyrene latex (PSL) standard at 203 3%), (c)...
Abstract. Global models predict that new particle formation (NPF) is, in some environments, responsible for a substantial fraction of the total atmospheric number concentration and subsequently contributes significantly to cloud condensation nuclei (CCN) concentrations. NPF events were frequently observed at highest observatory world, on Chacaltaya (5240 m a.s.l.), Bolivia. The present study focuses impact CCN population. Neutral cluster Air Ion Spectrometer mobility size spectrometer...
ABSTRACT In situ climatological observations are essential for studies related to climate trends and extreme events. However, in many regions of the globe, observational records affected by a large number data quality issues. Assessing controlling such datasets is an important, often overlooked aspect research. Besides analysing measurement data, metadata important comprehensive assessment. missing, but may partly be reconstructed suitable actions as station inspections. This study...
Abstract. Aerosol particles are a complex component of the atmospheric system which influence climate directly by interacting with solar radiation, and indirectly contributing to cloud formation. The variety their sources, as well multiple transformations they may undergo during transport (including wet dry deposition), result in significant spatial temporal variability properties. Documenting this is essential provide proper representation aerosols condensation nuclei (CCN) models. Using...
Urban development, growing industrialization, and increasing demand for mobility have led to elevated levels of air pollution in many large cities Latin America, where quality standards WHO guidelines are frequently exceeded. The conurbation the metropolitan area La Paz/El Alto is one fastest urban settlements South America with particularity being located a very complex terrain at high altitude. As or areas, Altiplano region facing deterioration. Long-term measurement data equivalent black...
New particle formation (NPF) in the tropical free troposphere (FT) is a globally important source of cloud condensation nuclei, affecting properties and climate. Oxidized organic molecules (OOMs) produced from biogenic volatile compounds are believed to contribute aerosol FT, but without direct chemical observations. We performed situ molecular-level OOMs measurements at Bolivian station Chacaltaya 5240 m above sea level, on western edge Amazonia. For first time, we demonstrate presence...
Abstract. The chemical composition of PM10 and non-overlapping PM2.5 was studied at the summit Mt. Chacaltaya (5380 m a.s.l., lat. −16.346950°, long. −68.128250°) providing a unique long-term record spanning from December 2011 to March 2020. aerosol Global Atmosphere Watch (GAW) site is representative regional background, seasonally affected by biomass burning practices nearby anthropogenic emissions metropolitan area La Paz–El Alto. Concentration levels are clearly influenced seasons with...
Este artículo analiza la desigualdad urbana desde el acceso al espacio público, construyendo una narrativa relacional mediante análisis cartográfico y cuantitativo de distintas capas socioespaciales. Para esto, se toma como caso estudio Provincia Constitucional del Callao, examinando distribución, calidad cobertura territorial sus espacios públicos. A continuación, calculan los metros cuadrados público a que pueden acceder peatonalmente habitantes, quince minutos viviendas. La información...
Abstract. In this study, we investigate atmospheric new particle formation (NPF) across 65 d in the Bolivian central Andes at two locations: mountaintop Chacaltaya station (CHC, 5.2 km above sea level) and an urban site El Alto–La Paz (EAC), 19 apart 1.1 lower altitude. We classified days into four categories based on intensity of NPF, determined by daily maximum concentration 4–7 nm particles: (1) high both sites, (2) medium both, (3) EAC but low CHC, (4) both. These were then named after...
In 2024, Bolivia experienced the worst year of fires since 2002, when Aqua MODIS began collecting data. According to estimates, more than 15 million hectares were burned this year. A sunphotometer sitting in Bolivian lowlands recorded AOD values higher two for several continuous days indicating degradation air quality region. unique set instruments located Andes transport smoke produced by biomass burning. Very high atmospheric tracers like carbon monoxide, equivalent black carbon, and...
Abstract This paper presents an introduction to the Southern Hemisphere High Altitude Experiment on Particle Nucleation and Growth (SALTENA). field campaign took place between December 2017 June 2018 (wet dry season) at Chacaltaya (CHC), a GAW (Global Atmosphere Watch) station located 5,240 m MSL in Bolivian Andes. Concurrent measurements were conducted two additional sites El Alto (4,000 MSL) La Paz (3,600 MSL). The overall goal of was identify sources, understand formation mechanisms...
Abstract. High-quality atmospheric mercury (Hg) data are rare for South America, especially its tropical region. As a consequence, dynamics still highly uncertain in this This is significant deficiency, as America appears to play major role the global budget of toxic pollutant. To address issue, we performed nearly 2 years (July 2014–February 2016) continuous high-resolution total gaseous (TGM) measurements at Chacaltaya (CHC) mountain site Bolivian Andes, which subject diverse mix air...
Precipitation variability in tropical high mountains is a fundamental yet poorly understood factor influencing local climatic expression and variety of environmental processes, including glacier behavior water resources. type, diurnality, frequency, amount influence hydrological runoff, surface albedo, soil moisture, whereas cloud cover associated with precipitation events reduces solar irradiance at the surface. Considerable uncertainty remains multiscale atmospheric processes patterns...
Abstract. This study documents and analyses a 4-year continuous record of aerosol optical properties measured at the Global Atmosphere Watch (GAW) station Chacaltaya (CHC; 5240 m a.s.l.), in Bolivia. Records particle light scattering absorption coefficients are used to investigate how high Andean Cordillera is affected by both long-range transport fast-growing agglomeration La Paz–El Alto, located approximately 20 km away 1.5 below sampling site. The extended multi-year allows us particles...
Abstract. Aerosol particles are a complex component of the atmospheric system that influences climate directly by interacting with solar radiation, and indirectly contributing to cloud formation. The variety their sources, as well multiple transformations they may undergo during transport, result in significant spatial temporal variability properties. Documenting this is essential provide proper representation aerosols condensation nuclei (CCN) models. Using measurements conducted 2016 or...
Abstract Even though anthropogenic mercury (Hg) emissions to the atmosphere are ∼2.5 times higher in Northern Hemisphere (NH) than Southern (SH), atmospheric Hg concentrations NH only ∼1.5 SH. Global models attribute this apparent discrepancy large SH oceanic or interhemispheric exchange of through atmosphere. However, no observational data set exists serve as a benchmark validate whether these coarse‐resolution adequately represent complex dynamics exchange. During 2015–2016 El Niño, we...
Abstract. Dimethyl sulfide (DMS) is the primary natural contributor to atmospheric sulfur burden. Observations concerning fate of DMS oxidation products after long-range transport in remote free troposphere are, however, sparse. Here we present quantitative chemical ionization mass spectrometric measurements and its sulfuric acid (H2SO4), methanesulfonic (MSA), dimethylsulfoxide (DMSO), dimethylsulfone (DMSO2), methanesulfinic (MSIA), methyl thioformate (MTF), methanesulfenic (MSEA, CH3SOH),...
Abstract This study used the first detailed radar measurements of vertical structure precipitation obtained in central Andes southern Peru and Bolivia to investigate diurnal cycle melting-layer heights tropical Andes. Vertically pointing 24.1-GHz Micro Rain Radars Cusco, (3350 m MSL, August 2014–February 2015), La Paz, (3440 October 2015–February 2017), provided continuous 1-min profiles reflectivity Doppler velocity. The time–height data enabled determination timing, heights, identification...
Abstract. Early growth of atmospheric particles is essential for their survival and ability to participate in cloud formation. Many different vapors contribute the growth, but even main contributors still remain poorly identified many environments, such as high-altitude sites. Based on measured organic vapor sulfuric acid concentrations under ambient conditions, particle during new formation events was simulated compared with size distribution at Chacaltaya Global Atmosphere Watch station...
Abstract. In this study, we investigate atmospheric new particle formation (NPF) across 65 days in the Bolivian Central Andes at two locations: mountain-top Chacaltaya station (CHC, 5.2 km above sea level) and an urban site El Alto-La Paz (EAC), 19 apart 1.1 lower altitude. We categorize into four groups based on NPF intensity, determined with daily maximum concentration of 4–7 nm particles: (A) high both sites, (B) medium both, (C) EAC but low CHC, (D) both. This categorization was premised...