Néstor Y. Rojas

Análisis del origen de PM10 y PM2.5 en Bogotá gráficos polares

Determinar la procedencia de los contaminantes del aire registrados por una red de monitoreo es fundamental para disenar acciones de prevencion y control de la contaminacion. Con este fin, se analizaron, mediante la aplicacion Openair®, los registros de material particulado (PM10 y PM2.5), velocidad y direccion de los vientos, en 10 estaciones de monitoreo de calidad del aire en Bogota para el periodo 2009-2011, encontrandose la influencia de fuentes locales y regionales. Se determinaron altas concentraciones de material particulado relacionadas con velocidades de viento superiores a 5 m/s procedentes del occidente, lo cual sugiere un transporte regional de contaminantes desde los municipios vecinos del occidente de la ciudad (Soacha, Funza, Mosquera, Madrid), hacia su centro geografico. Estos municipios concentran actividad industrial y transporte pesado de bienes desde y hacia Bogota. Las fuentes localizadas al interior de la ciudad, en particular aquellas que emplean carbon como combustible y las fuentes moviles que transitan sobre las vias principales, contribuyen a generar altos niveles de material particulado cuando los vientos son debiles, pero en menor magnitud que las fuentes externas.

Fostering a Collaborative Atmospheric Chemistry Research Community in the Latin America and Caribbean Region

AbstractIn 2013, the international Commission on Atmospheric Chemistry and Global Pollution (iCACGP) and the International Global Atmospheric Chemistry (IGAC) Project Americas Working Group (iCACGP/IGAC AWG) was formed to build a cohesive network and foster the next generation of atmospheric scientists with the goal of contributing to a scientific community focused on building collective knowledge for the Americas. The Latin America–Caribbean (LAC) region shares common history, culture, and socioeconomic issues but, at the same time, it is highly diverse in its physical and human geography. The LAC region is unique because approximately 80% of its population lives in urban areas, resulting in high-density hotspots of urbanization and vast unpopulated rural areas. In recent years, most countries of the region have experienced rapid growth in population and industrialization as their economies emerge. The rapid urbanization, the associated increases in mobile and industrial sources, and the growth of the ag...

Preliminary Exploration of the Behavior of Conduction Calorimetric Cells in the Determination of the Caloric Value of Municipal Solid Waste

Abstract Two metallic calorimetric cells with different geometry, one cylindrical and the other rectangular, manufactured in steel, with an approximate capacity of 300 mL, were tested. The behavior of the two cells was studied under different isolation, energy source, and calorimetric liquid conditions. The caloric capacity of the calorimetric system with each cell was determined by electrical calibration; the result was used in the experimental evaluation of municipal solid waste caloric value.