气候变化领域集成服务门户(CCPortal): The Influence of Diapycnal Nutrient Fluxes on Phytoplankton Size Distribution in an Area of Intense Mesoscale and Submesoscale Activity off Concepción, Chile

CCPortal

DOI	10.1029/2019JC015539
	The Influence of Diapycnal Nutrient Fluxes on Phytoplankton Size Distribution in an Area of Intense Mesoscale and Submesoscale Activity off Concepción, Chile
	Corredor-Acosta A.; Morales C.E.; Rodríguez-Santana A.; Anabalón V.; Valencia L.P.; Hormazabal S.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Mesoscale and submesoscale processes that contribute to localized increases in nutrients in the sunlit layer can stimulate phytoplankton growth and community changes, but the mechanisms involved remain sparsely documented with in situ data in the case of Eastern Boundary Upwelling Systems (EBUSs) and of most ocean regions. The role of diapycnal mixing in providing nutrients to the upper layer and in influencing phytoplankton size structure was analyzed in an area of intense mesoscale and submesoscale activity during the coastal upwelling season off Concepción (~36–37°S), the Humboldt Current EBUS. Diapycnal nutrient fluxes based on conductivity, temperature, and depth vertical eddy diffusivity (Kz) values (the Thorpe scale method) and on nutrient gradients were assessed in association with size-fractionated chlorophyll-a and microdiatom abundance derived from in situ sampling in an area including a mesoscale intrathermocline eddy (ITE) adjacent to a coastal upwelling front (CUF). The indirect estimates of Kz values spanned between 0.01 and 4 × 10−4 m2 s−1, and maxima in diapycnal nitrate flux per station ranged between 0.08 and 19.1 mmol m−2 day−1. Maxima in the upward fluxes were detected at the subsurface (15–40 m depth) in the CUF and ITE areas, coinciding with maxima in the micro- and nano-chlorophyll-a fractions and in microdiatom abundance. These results suggest that ITE and CUF features, as well as their interaction, can generate intense diapycnal mixing and, thereby, contribute to increasing nutrient availability below the mixed layer. In turn, these processes enhance the contribution of larger phytoplankton cells in the coastal transition zone of EBUSs. ©2020. The Authors.
英文关键词	Coastal upwelling front; Diapycnal nutrient flux; Intrathermocline eddy; Phytoplankton size structure; Thorpe scale method; Vertical eddy diffusivity
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186863
作者单位	Programa de Postgrado en Oceanografía, Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile; Instituto Milenio de Oceanografía, Universidad de Concepción, Concepción, Chile; Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile; Departamento de Física, Facultad de Ciencias del Mar, Universidad de las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain; Escuela de Ciencias del Mar, Facultad de Ciencias del Mar y Geografía, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
推荐引用方式 GB/T 7714	Corredor-Acosta A.,Morales C.E.,Rodríguez-Santana A.,et al. The Influence of Diapycnal Nutrient Fluxes on Phytoplankton Size Distribution in an Area of Intense Mesoscale and Submesoscale Activity off Concepción, Chile[J],2020,125(5).
APA	Corredor-Acosta A.,Morales C.E.,Rodríguez-Santana A.,Anabalón V.,Valencia L.P.,&Hormazabal S..(2020).The Influence of Diapycnal Nutrient Fluxes on Phytoplankton Size Distribution in an Area of Intense Mesoscale and Submesoscale Activity off Concepción, Chile.Journal of Geophysical Research: Oceans,125(5).
MLA	Corredor-Acosta A.,et al."The Influence of Diapycnal Nutrient Fluxes on Phytoplankton Size Distribution in an Area of Intense Mesoscale and Submesoscale Activity off Concepción, Chile".Journal of Geophysical Research: Oceans 125.5(2020).