Video Experimental Relacionado

Updated: Nov 18, 2025

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

Una disminución de las emisiones mundiales de CFC-11 durante 2018-2019

Stephen A Montzka¹, Geoffrey S Dutton^2,3, Robert W Portmann⁴

¹Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA. stephen.a.montzka@noaa.gov.

|February 11, 2021

Resumen

Las emisiones mundiales de triclorofluorometano (CFC-11) disminuyeron significativamente en 2019, lo que indica una reducción de la producción no declarada. Esta disminución acelerada de la concentración de CFC-11 sugiere un agotamiento limitado de la capa de ozono en el futuro si se mantiene.

Área de la Ciencia:

Química y física de la atmósfera
Ciencias del medio ambiente
Investigación de la capa de ozono

Sus antecedentes:

Las concentraciones atmosféricas de triclorofluorometano (CFC-11) disminuyeron después de la eliminación gradual del Protocolo de Montreal.
Una desaceleración inesperada en la disminución de los CFC-11 desde 2013 estaba relacionada con el aumento de las emisiones de la producción no declarada.
Las emisiones sostenidas amenazaron la recuperación de la capa de ozono estratosférica.

Objetivo del estudio:

Investigar la tendencia reciente de la concentración media mundial de CFC-11.
Cuantificar los cambios en las emisiones mundiales de CFC-11 e identificar las fuentes.
Evaluar las implicaciones para la recuperación de la capa de ozono estratosférica.

Principales métodos:

Análisis de las mediciones de las concentraciones atmosféricas realizadas en sitios de monitoreo remotos a escala mundial.
Cálculo de las emisiones globales de CFC-11 basadas en los cambios de concentración.
Comparación de los datos recientes sobre las emisiones con las medias históricas.

Principales resultados:

Se observó una disminución acelerada de la concentración media mundial de CFC-11 durante 2019-2020.
Las emisiones mundiales de CFC-11 disminuyeron un 26% entre 2018 y 2019, alcanzando niveles similares a los de 2008-2012.
Esta reducción implica una disminución significativa de la producción no declarada de CFC-11.

Conclusiones:

La fuerte disminución de las emisiones mundiales inesperadas sugiere una reducción sustancial de la producción ilícita de CFC-11.
Si se mantiene esta tendencia, es probable que se limite el agotamiento del ozono en el futuro.
A pesar del aumento del banco de CFC-11, la reducción acelerada de las emisiones mitiga los riesgos de recuperación del ozono a largo plazo.

Más Videos Relacionados

Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace

Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace

Published on: September 6, 2018

Author Spotlight: Advancing Coral Culture - Creating a Semi-Quantitatively Controlled Microenvironment System to Counter Current Limitations

Author Spotlight: Advancing Coral Culture - Creating a Semi-Quantitatively Controlled Microenvironment System to Counter Current Limitations

Published on: July 21, 2023

Videos de Conceptos Relacionados

Global Climate Change

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

The Carbon Cycle

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.

What is Climate?

What is Climate?

Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.

Carbon-13 (¹³C) NMR: Overview

Carbon-13 (¹³C) NMR: Overview

Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Threats to Biodiversity

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...