English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/153895
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

A global model of tropospheric chlorine chemistry: Organic versus inorganic sources and impact on methane oxidation

AutorHossaini, R.; Chipperfield, M.P.; Saiz-Lopez, A. ; Fernandez, R.P.; Monks, S.; Feng, W.; Brauer, P.; von Glasow, R.
Fecha de publicación2016
EditorAmerican Geophysical Union
CitaciónJournal of Geophysical Research: Atmospheres 121: 14,271- 14,297 (2016)
ResumenChlorine atoms (Cl) are highly reactive toward hydrocarbons in the Earth's troposphere, including the greenhouse gas methane (CH). However, the regional and global CH sink from Cl is poorly quantified as tropospheric Cl concentrations ([Cl]) are uncertain by ~2 orders of magnitude. Here we describe the addition of a detailed tropospheric chlorine scheme to the TOMCAT chemical transport model. The model includes several sources of tropospheric inorganic chlorine (Cl), including (i) the oxidation of chlorocarbons of natural (CHCl, CHBrCl, CHBrCl, and CHBrCl) and anthropogenic (CHCl, CHCl, CCl, CHCl, and CHClCHCl) origin and (ii) sea-salt aerosol dechlorination. Simulations were performed to quantify tropospheric [Cl], with a focus on the marine boundary layer, and quantify the global significance of Cl atom CH oxidation. In agreement with observations, simulated surface levels of hydrogen chloride (HCl), the most abundant Cl reservoir, reach several parts per billion (ppb) over polluted coastal/continental regions, with sub-ppb levels typical in more remote regions. Modeled annual mean surface [Cl] exhibits large spatial variability with the largest levels, typically in the range of 1–5 × 10 atoms cm, in the polluted northern hemisphere. Chlorocarbon oxidation provides a tropospheric Cly source of up to ~4320 Gg Cl/yr, sustaining a background surface [Cl] of <0.1 to 0.5 × 10 atoms cm over large areas. Globally, we estimate a tropospheric methane sink of ~12–13 Tg CH/yr due the CH + Cl reaction (~2.5% of total CH oxidation). Larger regional effects are predicted, with Cl accounting for ~10 to >20% of total boundary layer CH oxidation in some locations.
Identificadoresdoi: 10.1002/2016JD025756
issn: 2169-8996
Aparece en las colecciones: (IQFR) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
JCompPhy2016_309_314.pdf365,64 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.