SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Extreme Phytoplankton Blooms in the Southern Tropical Indian Ocean in 2011
Liao, Xiaomei1,2,3; Du, Yan4,5,6; Wang, Tianyu4; He, Qingyou4; Zhan, Haigang4; Hu, Shuibo1,2; Wu, Guofeng1,2,3
2020
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume125Issue:4Pages:e2019JC015649
AbstractThis study investigates extreme phytoplankton blooms in the southern tropical Indian Ocean (TIO) in January-April 2011 using the extended ocean color products and in situ data. The amplitude of the blooms was approximately 4 times higher than the climatological value and 2 times higher than that in 1998-1999. The anomalous enhancement of surface chlorophyll-a concentration (Chla) was associated with the strong upwelling Rossby waves that forced by the extraordinary strong wind stress curl in the southeastern TIO during 2010-2011 La Nina, which was much stronger than that of 1998-1999 La Nina. The Rossby waves uplifted the thermocline, which was shoaled by more than 70 m relative to the climatology. The results of the nonlinear 1.5-layer reduced-gravity model further suggest that the thermocline variations are mainly due to the wind stress curl over the interior TIO. In the vertical direction, the Argo data show a distinct upward and westward propagation of subsurface cooling, indicating that the upwelling of cold nutrient-rich waters leads to the abnormally high Chla. The strong upwelling processes are also well captured by the Moored Array for African-Asian-Australian Monsoon Analysis and Prediction observations at 8 degrees S, 80.5 degrees E. Based on the climatological in situ nitrate data, the Rossby wave-induced nitrate supply and potential new production at the mooring site are estimated. The potential f ratio ranges from 50% to 87% when the water brought to the surface is assumed to have originated from 60 to 200 m, thus indicating the dominant role of nutrient supply by the upwelling processes. Plain Language Summary Taking advantage of extended ocean color products and observation from Argo and Moored Array for African-Asian-Australian Monsoon Analysis and Prediction, this study investigates extreme phytoplankton blooms in the southern TIO during the 2010-2011 La Nina event. The amplitude of the blooms was approximately 4 times higher than the climatological value and 2 times higher than that in another La Nina year 1998-1999. The anomalous enhancement of surface chlorophyll-a concentration was associated with the strong upwelling Rossby waves that forced by the extraordinary strong wind stress curl in the southeastern TIO during 2010-2011 La Nina. The in situ data reveal the dominant role of Rossby wave-induced upwelling in triggering the extreme blooms in the southern TIO.
DepartmentLTO
Keywordsouthern tropical Indian Ocean phytoplankton bloom La Nina upwelling Rossby wave
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/18330
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Shenzhen Univ, MNR Key Lab Geoenvironm Monitoring Great Bay Area, Shenzhen, Peoples R China
2.Shenzhen Univ, Guangdong Key Lab Urban Informat, Shenzhen, Peoples R China
3.Shenzhen Univ, Shenzhen Key Lab Spatial Smart Sensing & Serv, Shenzhen, Peoples R China
4.Shenzhen Univ, Coll Life Sci & Oceanog, Shenzhen, Peoples R China
5.Chinese Acad Sci, South China Sea Inst Oceanol SCSIO, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
6.Univ Chinese Acad Sci, Beijing, Peoples R China
7.Southern Marine Sci & Engn Guangdong Lab, Guangzhou, Peoples R China
Recommended Citation
GB/T 7714
Liao, Xiaomei,Du, Yan,Wang, Tianyu,et al. Extreme Phytoplankton Blooms in the Southern Tropical Indian Ocean in 2011[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2020,125(4):e2019JC015649.
APA Liao, Xiaomei.,Du, Yan.,Wang, Tianyu.,He, Qingyou.,Zhan, Haigang.,...&Wu, Guofeng.(2020).Extreme Phytoplankton Blooms in the Southern Tropical Indian Ocean in 2011.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,125(4),e2019JC015649.
MLA Liao, Xiaomei,et al."Extreme Phytoplankton Blooms in the Southern Tropical Indian Ocean in 2011".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 125.4(2020):e2019JC015649.
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