Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/11184
COMPARTIR / EXPORTAR:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Título

Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations

AutorVallina, Sergio M. CSIC ORCID; Simó, Rafel CSIC ORCID ; Gassó, S.; Boyer-Montégut, C. de; Río, Evilio del CSIC ORCID; Jurado, Elena CSIC ORCID; Dachs, Jordi CSIC ORCID
Palabras claveCloud condensation nuclei
Dimethylsulfide
Global-seasonal correlations
Fecha de publicaciónjul-2007
EditorAmerican Geophysical Union
CitaciónGlobal Biogeochemical Cycles 21(2): 1-15 (2007)
ResumenThe CLAW postulate states that an increase insolar irradiance or in the heat flux to the ocean can trigger a biogeochemical response to counteract the associated increase in temperature and available sunlight. This natural (negative) feedback mechanism would be based on a multistep response: first, an increase in seawater dimethylsulfide concentrations (DMSw) and therefore its fluxes to the atmosphere (DMSflux,); second, an increase in the atmospheric cloud condensation nuclei (CCN) burden as a consequence of DMS oxidation to form biogenic CCN (CCNbio); and third, an increase in cloud albedo due to higher CCN numbers. Monthly global climatological fields of the solar radiation dose in the upper mixed layer (SRD), surface oceanic DMSw, model outputs of hydroxyl radical concentrations (OH), and satellite-derived CCN numbers (CCNs) are analyzed in order to evaluate the proposed “solar radiation dose-DMSCCN” link from a global point of view. OH is included as the main atmospheric oxidant of the estimated DMSflux to produce CCNbio. Global maps of seasonal correlations between the variables show that the solar radiation dose is highly (positively) correlated with seawater dimethylsulfide over most of the global ocean and that atmospheric DMS oxidation is highly (positively) correlated with CCNs over large regions. These couplings are stronger at high latitudes, whereas dic regions with negative or no correlation are located at low latitudes around the equator. However, CCNbio estimates for 15 regions of the global ocean show that DMS oxidation can be an important contributor to the CCNs burden only over pollution-free regions, while it would have a minor contribution over regions with high loads of continental aerosols. Globally, the mean annual contribution of CCNbio to total CCNs is estimated to be about 30%. Our results support that an oceanic biogenic mechanism that modulates cloud formation and albedo can indeed occur, although its impact seems rather weak over regions under a strong influence of continental aerosols. Nevertheless, our approach does not fully rule out that the observed correlations are due to an independent seasonal variation of the studied variables; seasonal couplings are necessary but not sufficient conditions to prove the CLAW hypothesis.
Descripción15 pages, 8 figures.
Versión del editorhttp://dx.doi.org/10.1029/2006GB002787
URIhttp://hdl.handle.net/10261/11184
DOI10.1029/2006GB002787
ISSN0886-6236
Aparece en las colecciones: (IDAEA) Artículos
(ICM) Artículos




Ficheros en este ítem:
Fichero Descripción Tamaño Formato
Vallina_et_al_2007.pdf840,44 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo

CORE Recommender

SCOPUSTM   
Citations

55
checked on 28-mar-2024

WEB OF SCIENCETM
Citations

52
checked on 22-feb-2024

Page view(s)

599
checked on 28-mar-2024

Download(s)

223
checked on 28-mar-2024

Google ScholarTM

Check

Altmetric

Altmetric


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