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General Session 3: Biological oceanography & global change |
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Impact of typhoon Soulik on primary production in the South China Sea
GS3-22-S
Po-Chien Kuan* , Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan.
Chin-Chang Hung, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan.
Presenter Email: ms0425027@yahoo.com.tw
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| Recent research has shown that typhoons can increase primary production (PP) in the ocean, but these reports are mostly based on satellite remote sensing data and model estimation (e.g. the vertically generalized productivity model, VGPM). In 2013,we conducted field investigation and measured nutrient chlorophyll-a (Chl-a) concentrations in the South China Sea (SCS) after typhoon Soulik and estimated net PP using a VGPM model and a simple depth-integrated biomass based model (SIMBIO). The profiles of Chl-a concentration at these four stations show sub-surface maximum within the depth of the euphotic zone. The SIMBIO-estimated PP values at stations CR1, S1, S2 and S3 in the SCS were 378, 430, 392, and 534 mgC/m2/d, respectively. The VGPM-estimated PP values at same stations in the SCS were 298, 260, 259 and 359 mgC/m2/d, respectively. The result shows that SIMBIO-derived PP values are higher than VGPM-derived PP values suggesting that the VGPM model may underestimate integrated biomass after a typhoon event since the VGPM assuming the maximum Chl-a concentration is in the surface layer and Chl-a value exponentially decreases with depth. Our results suggest that the VGPM may not be suitable to provide quantitative estimates of PP values in open ocean after typhoon events because satellite image can not provide high sub-surface Chl-a peak data. It needs to establish a useful PP model in the future. |
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