| HONG Lisha,WANG Chunsheng,ZHOU Yadong,CHEN Mianrun,LIU Hongbin,LIN Zhongyang,SONG Xunshu. 2012. The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer. Acta Oceanologica Sinica, (5):146－159 |
| The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer |
| The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer |
| Received:September 06, 2011 Revised:June 24, 2012 |
| DOI：10.1007/s13131-012-0244-6 |
| Key words:eastern Indian Ocean chlorophyll a size fraction Indonesian Throughflow |
| 中文关键词: eastern Indian Ocean chlorophyll a size fraction Indonesian Throughflow |
| 基金项目:China Ocean Mineral Resources R & D Association under contract No. DY125-13-E-01; the Scientific Research Fund of the Second Institute of Oceanography, State Oceanic Administration under contract No. JG1024. |
| Author Name | Affiliation | E-mail | | HONG Lisha | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China | | | WANG Chunsheng | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China | wang-sio@163.com | | ZHOU Yadong | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China | | | CHEN Mianrun | Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China | | | LIU Hongbin | Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China | | | LIN Zhongyang | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China | | | SONG Xunshu | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China | |
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| Abstract: |
| To study the effect of hydrographic factors on the spatial distributions of chlorophyll a (Chl a), an investigation was carried out in the tropical eastern Indian Ocean (80°-100°E along 7°S, and 7°-18°S along 80°E) in December 2010. The fluorescent method was used to obtain total Chl a and size-fractioned Chl a at the 26 stations. The results show that surface Chl a concentration averaged at (0.168±0.095) mg/m3 s.d. (range:0.034-0.475 mg/m3), concentrations appeared to be higher in the west for longitudinal variations, and higher in the north for latitudinal variations. Furthermore, the surface Chl a concentration was lower (0.034-0.066 mg/m3) in the region to the south of 16°S. There was a strong subsurface Chl a maximum layer at all stations and the depth of the Chl a maximum increased towards to the east and south along with the respective nitracline. The spatial variation of Chl a was significant:correlation and regression analysis suggests that it was primarily affected by PO43-, N(NO3-N+NO2-N) and temperature. Size-fractionated Chl a concentration clearly showed that the study area was a typical oligotrophic open ocean, in which picophytoplankton dominated, accounting for approximately 67.8% of total Chl a, followed by nanophytoplankton (24.5%) and microphytoplankton (7.6%). The two larger fractions were sensitive to the limitation of P, while picophytoplankton was primarily affected by temperature. |
| 中文摘要: |
| To study the effect of hydrographic factors on the spatial distributions of chlorophyll a (Chl a), an investigation was carried out in the tropical eastern Indian Ocean (80°-100°E along 7°S, and 7°-18°S along 80°E) in December 2010. The fluorescent method was used to obtain total Chl a and size-fractioned Chl a at the 26 stations. The results show that surface Chl a concentration averaged at (0.168±0.095) mg/m3 s.d. (range:0.034-0.475 mg/m3), concentrations appeared to be higher in the west for longitudinal variations, and higher in the north for latitudinal variations. Furthermore, the surface Chl a concentration was lower (0.034-0.066 mg/m3) in the region to the south of 16°S. There was a strong subsurface Chl a maximum layer at all stations and the depth of the Chl a maximum increased towards to the east and south along with the respective nitracline. The spatial variation of Chl a was significant:correlation and regression analysis suggests that it was primarily affected by PO43-, N(NO3-N+NO2-N) and temperature. Size-fractionated Chl a concentration clearly showed that the study area was a typical oligotrophic open ocean, in which picophytoplankton dominated, accounting for approximately 67.8% of total Chl a, followed by nanophytoplankton (24.5%) and microphytoplankton (7.6%). The two larger fractions were sensitive to the limitation of P, while picophytoplankton was primarily affected by temperature. |
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