Constraints on the late holocene anthropogenic contribution to the atmospheric methane budget.
Science
; 342(6161): 964-6, 2013 Nov 22.
Article
em En
| MEDLINE
| ID: mdl-24264988
ABSTRACT
The origin of the late preindustrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the increase in concentrations. Here two high-resolution, high-precision ice core methane concentration records from Greenland and Antarctica are presented and are used to construct a high-resolution record of the methane inter-polar difference (IPD). The IPD record constrains the latitudinal distribution of emissions and shows that LPIH emissions increased primarily in the tropics, with secondary increases in the subtropical Northern Hemisphere. Anthropogenic and natural sources have different latitudinal characteristics, which are exploited to demonstrate that both anthropogenic and natural sources are needed to explain LPIH changes in methane concentration.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Atmosfera
/
Camada de Gelo
/
Indústrias
/
Metano
Tipo de estudo:
Health_economic_evaluation
Limite:
Humans
País/Região como assunto:
America do norte
/
Europa
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article