Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam - fdi:010071883 - Horizon

Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Mari Xavier, Van T. C., Guinot B., Brune J., Lefebvre Jean-Pierre, Raimbault P., Dittmar T., Niggemann J. (2017). Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam. Elementa : Science of the Anthropocene, 5, art. 75 [22 p.]. ISSN 2325-1026

Fichier PDF disponible http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-01/010071883.pdf

Lien direct chez l'éditeur doi:10.1525/elementa.255

Titre
Seasonal dynamics of atmospheric and river inputs of black carbon, and impacts on biogeochemical cycles in Halong Bay, Vietnam
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000417490100001
AuteursMari Xavier, Van T. C., Guinot B., Brune J., Lefebvre Jean-Pierre, Raimbault P., Dittmar T., Niggemann J.
SourceElementa : Science of the Anthropocene, 2017, 5, p. art. 75 [22 p.]. p. art. 75 [22 p.] ISSN 2325-1026
RésuméEmissions of black carbon (BC), a product of incomplete combustion of fossil fuels, biofuels and biomass, are high in the Asia-Pacific region, yet input pathways and rates to the ocean are not well constrained. Atmospheric and riverine inputs of BC in Halong Bay (Vietnam), a hotspot of atmospheric BC, were studied at monthly intervals during one year. Climate in Halong Bay is governed by the monsoon regime, characterized by a northeast winter monsoon (dry season) and southeast summer monsoon (wet season). During the dry season, atmospheric BC concentrations averaged twice those observed during the wet season. In the sea surface microlayer (SML) and underlying water (ULW), concentrations of particulate BC (PBC) averaged 539 and 11 mu mol C L-1, respectively. Dissolved BC (DBC) concentrations averaged 2.6 mu mol C L-1 in both the SML and ULW. Seasonal variations indicated that PBC concentration in the SML was controlled by atmospheric deposition during the dry season, while riverine inputs controlled both PBC and DBC concentrations in ULW during the wet season. Spatiotemporal variations of PBC and DBC during the wet season suggest that river runoff was efficient in transporting PBC that had accumulated on land during the dry season, and in mobilizing and transporting DBC to the ocean. The annual river flux of PBC was about 3.8 times higher than that of DBC. The monsoon regime controls BC input to Halong Bay by favoring dry deposition of BC originating from the north during the dry season, and wet deposition and river runoff during the wet season. High PBC concentrations seem to enhance the transfer of organic carbon from dissolved to particulate phase by adsorbing dissolved organic carbon and stimulating aggregation. Such processes may impact the availability and biogeochemical cycling of other dissolved substances, including nutrients, for the coastal marine ecosystem.
Plan de classementSciences du milieu [021] ; Limnologie physique / Océanographie physique [032] ; Ecologie, systèmes aquatiques [036]
Descr. géo.VIET NAM ; HA LONG BAIE
LocalisationFonds IRD [F B010071883]
Identifiant IRDfdi:010071883
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071883

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito