| WU Jingyu,HONG Huasheng,SHANG Shaoling,DAI Minhan,LEE Zhongping,LI Shaojing. 2009. A preliminary study of the variation of phytoplankton absorption coefficients in the northern South China Sea. Acta Oceanologica Sinica, (5):17－29 |
| A preliminary study of the variation of phytoplankton absorption coefficients in the northern South China Sea |
| A preliminary study of the variation of phytoplankton absorption coefficients in the northern South China Sea |
| Received:September 29, 2007 Revised:June 11, 2009 |
| DOI： |
| Key words:phytoplankton absorption coefficient variation picoprokaryotes parameterization South China Sea |
| 中文关键词: phytoplankton absorption coefficient variation picoprokaryotes parameterization South China Sea |
| 基金项目:The National Basic Research Program of China under contract Nos 2009CB421200, 2009CB421201;the National Natural Science Foundation of China under contract No40821063;High-Tech R&D Program of China under contract Nos2006AA09A302 and 2008AA09Z108 |
| Author Name | Affiliation | E-mail | | WU Jingyu | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
Department of Oceanography, Xiamen University, Xiamen 361005, China | SHANG Shaoling,E-mail:slshang@gmail.com | | HONG Huasheng | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | SHANG Shaoling | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | DAI Minhan | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | LEE Zhongping | Naval Research Lab, Code 7333, Stennis Space Center, MS 39529, USA | | | LI Shaojing | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
Department of Oceanography, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| The temporal and spatial variabilities of phytoplankton absorption coefficients (aph (λ)) and their relationships with physical processes in the northern South China Sea were examined,based on in situ data collected from two cruise surveys during May 14 to 25,2001 and November 2 to 21,2002.Significant changes in the surface water in aph values and B/R ratios (aph (440)/aph (675)) were observed in May,which were caused by aph ytoplankton bloom on the inner shelf stimulated by a large river plume due to heavy precipitation.This is consistent with the observed one order of magnitude elevation of chlorophyll a and a shift from a pico/nano dominated phytoplankton community to one dominated by micro-algae.Enhanced vertical mixing due to strengthened northeast monsoon in November has been observed to result in higher surface aph (675) (0.002-0.006 m-1 higher) and less pronounced subsurface maximum on the outer shelf/slope in November as compared with that in May.Measurements of aph and B/R ratios from three transects in November revealed a highest surface aph (675) immediately outside the mouth of the Zhujiang (Pearl) River Estuary,whereas lower aph (675) and higher B/R ratios were featured in the outer shelf/slope waters,demonstrating the respective influence of the Zhujiang River plume and the oligotrophic water of the South China Sea.The difference in spectral shapes of phytoplankton absorption (measured by B/R ratios and bathochromic shifts) on these three transects infers that picoprocaryotes are the major component of the phytoplankton community on the outer shelf/slope rather than on the inner shelf.A regional tuning of the phytoplankton absorption spectral model (Carder et al.,1999) was attempted,demonstrating a greater spatial variation than temporal variation in the lead parameter a0 (λ).It was thus implicated that region-based parameterization of ocean color remote sensing algorithms in the northern South China Sea was mandatory. |
| 中文摘要: |
| The temporal and spatial variabilities of phytoplankton absorption coefficients (aph (λ)) and their relationships with physical processes in the northern South China Sea were examined,based on in situ data collected from two cruise surveys during May 14 to 25,2001 and November 2 to 21,2002.Significant changes in the surface water in aph values and B/R ratios (aph (440)/aph (675)) were observed in May,which were caused by aph ytoplankton bloom on the inner shelf stimulated by a large river plume due to heavy precipitation.This is consistent with the observed one order of magnitude elevation of chlorophyll a and a shift from a pico/nano dominated phytoplankton community to one dominated by micro-algae.Enhanced vertical mixing due to strengthened northeast monsoon in November has been observed to result in higher surface aph (675) (0.002-0.006 m-1 higher) and less pronounced subsurface maximum on the outer shelf/slope in November as compared with that in May.Measurements of aph and B/R ratios from three transects in November revealed a highest surface aph (675) immediately outside the mouth of the Zhujiang (Pearl) River Estuary,whereas lower aph (675) and higher B/R ratios were featured in the outer shelf/slope waters,demonstrating the respective influence of the Zhujiang River plume and the oligotrophic water of the South China Sea.The difference in spectral shapes of phytoplankton absorption (measured by B/R ratios and bathochromic shifts) on these three transects infers that picoprocaryotes are the major component of the phytoplankton community on the outer shelf/slope rather than on the inner shelf.A regional tuning of the phytoplankton absorption spectral model (Carder et al.,1999) was attempted,demonstrating a greater spatial variation than temporal variation in the lead parameter a0 (λ).It was thus implicated that region-based parameterization of ocean color remote sensing algorithms in the northern South China Sea was mandatory. |
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