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- Title
Primary nitrite maximum in the euphotic layer near the Xisha Islands, South China Sea.
- Authors
Wu, Mei-Lin; Liu, Qin-Yan; Dong, Jun-De; Wang, You-Shao; Wang, Dong-Xiao
- Abstract
A subsurface nitrite maximum was observed along one transection near the Xisha Islands in the South China Sea in early September 2009. Possible causes were examined using in situ observed data and remote sensing data. A cold eddy was identified near the Xisha Islands during the periods of study. The Xisha Islands' water receives copious supplies of nutrients through cold eddies. Accumulation of nitrite about 50 m deep reaches 0.49 μmol l−1, and forms and maintains the primary nitrite maximum. The relationship between NO2−and Chl-ais very significant (R2= 0.5829, p-value(statistical significance)= 0.00). Nitrification processes would result in apparent oxygen utilization (AOU) ranging from 0.22 to 35.88 μM, around 24.60% of the total biological oxygen demand in the water column of under-saturation of dissolved oxygen. This value is very close to the Redfield stoichiometry (32/138 = 23%) of total oxygen consumption associated with organic matter diagenesis. These results may support the hypothesis that phytoplankton and the nitrification process have an important influence on the PNM or 260 maintenance in the euphotic layer. Our results indicate that physical conditions and biological activities near the Xisha Islands play a significant role in regulating biogeochemistry.
- Subjects
EUPHOTIC zone; NITRITES; NITROGEN compounds &; the environment; EDDY viscosity; NITRIFICATION
- Publication
Aquatic Ecosystem Health & Management, 2015, Vol 18, Issue 4, p414
- ISSN
1463-4988
- Publication type
Article
- DOI
10.1080/14634988.2015.1115321