Anomalous biogeochemical conditions in the northern South China Sea during the El-Niño events between 1997 and 2003

Details Anomalous biogeochemical conditions in the northern South China Sea during the El-Niño events between 1997 and 2003 Anomalous biogeochemical conditions in the northern South China Sea during the El-Niño events between 1997 and 2003

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3614611t&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 14, CiteID L14611

Mathematics

Logic

1

Hydrology: Time Series Analysis (3270, 4277, 4475), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: General: Physical And Biogeochemical Interactions, Oceanography: Physical: Enso (4922), Paleoceanography: El Nino (4522)

Scientific paper

Anomalous biogeochemical conditions were observed at the SouthEast Asian Time-series Study (SEATS) station in the northern South China Sea (SCS) during the 1997-98 and 2002-03 El Niño events. The time-series records showed decreases of monthly mean sea surface chlorophyll-a (S-chl) (and integrated primary production, IPP) by 42% (and 42%) and 13% (and 10%), respectively, below the climatological mean in the winter months (DJF) of the two events. The negative anomalies in S-chl and IPP corresponded to elevated sea surface temperature by 1.2°C and 0.4°C, respectively, above the climatological mean, while the mean wind speed was reduced by about 20% and 11%, respectively. Statistical analysis demonstrated the reduction in S-chl and IPP during El Niño events was caused by the diminished vertical mixing and strengthened stratification. Regional anomalies in hydrographic and biological conditions in the northern SCS (15-21°N and 112-119°E) were consistent with those found at the SEATS site.

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