Progressive eutrophication behind the world-largest super floating macroalgal blooms in the Yellow Sea - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Biogeosciences Année : 2014

Progressive eutrophication behind the world-largest super floating macroalgal blooms in the Yellow Sea

Q. Xing
  • Fonction : Auteur
M. Gao
  • Fonction : Auteur
X. Gao
  • Fonction : Auteur
L. Tosi
Y. Zhang
  • Fonction : Auteur
P. Shi
  • Fonction : Auteur
J. Wei
  • Fonction : Auteur
Y. Luo
  • Fonction : Auteur

Résumé

World-largest super floating macroalgal blooms of Ulva prolifera have lasted 7 years by now in every summer in the Yellow Sea, the outer part of a semi-enclosed coastal sea. Evaluation of the inter-annual variability in the trophic status is one of fundamental tasks for prediction and management of the blooms. We show the new findings of a progressive eutrophication in the large Yellow Sea basin behind the super floating macroalgal blooms. The inter-annual variability in human-induced nutrient pollution from 2001 to 2012 was assessed by a nutrient pollution index weighted by area (AWCPI-NP), and a significant increase in the trophic status was found in the macroalgal bloom (MAB) phase (2007-2012): the average AWCPI-NP was higher than that in the pre-MAB phase (2001-2006) by about 45%; meanwhile, in the Jiangsu Shoal, origin place of the drifting macroaglae, the annual in-situ nutrient concentrations increased rapidly from 2000 to 2011. Chlorophyll a concentration (Chl a), an indicator of eutrophication, increased by about 15% in the bloom region from the pre-MAB to MAB phase. This progressive eutrophication might lead to the non-linear outburst in the growth of macroalgae, i.e., green tides, in the Yellow Sea since 2007.

Domaines

Océanographie

Dates et versions

hal-01009903 , version 1 (18-06-2014)

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Paternité

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Citer

Q. Xing, M. Gao, X. Gao, L. Tosi, François G Schmitt, et al.. Progressive eutrophication behind the world-largest super floating macroalgal blooms in the Yellow Sea. 2014. ⟨hal-01009903⟩
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