气候变化领域集成服务门户(CCPortal): Understanding the Role of Nutrient Limitation on Plankton Biomass Over Arabian Sea Via 1-D Coupled Biogeochemical Model and Bio-Argo Observations

CCPortal

DOI	10.1029/2019JC015502
	Understanding the Role of Nutrient Limitation on Plankton Biomass Over Arabian Sea Via 1-D Coupled Biogeochemical Model and Bio-Argo Observations
	Anju M.; Sreeush M.G.; Valsala V.; Smitha B.R.; Hamza F.; Bharathi G.; Naidu C.V.
发表日期	2020
ISSN	21699275
卷号	125 期号:6
英文摘要	Arabian Sea (AS) is known to have seasonal phytoplankton blooms during winter and summer driven by dynamically distinct physical forcing mechanisms and associated nutrient dynamics. A 1-D coupled physical-biogeochemical model based on North Pacific Ecosystem Model for Understanding Regional Oceanography (NEMURO) with nitrogen and silicon cycles is adapted for the AS environment. The model is implemented to investigate the role of nitrogen (nitrate + ammonium) versus silicate limitation on plankton biomass. The seasonal cycle of plankton biomass is well simulated by the model along bio-Argo (during a period from 2013 to 2016) and ship cruise tracks (for the single year 2009). Further, three sensitivity simulations are conducted by suppressing (1) nitrate availability (representing new production), (2) ammonium availability (representing regenerated production), and (3) silicate availability (for diatom production). The new production represents 80% of the total primary production in the AS and implicitly controls 70% of total zooplankton production annually. The regenerated production augments small phytoplankton (by ~50%; e.g., flagellates) and small zooplankton (by ~20%; e.g., ciliates) growth with negligible effects on large phytoplankton (e.g., diatom) and predatory zooplankton (e.g., copepods). The diatom production remains within the observed range due to silicate limitation which is fundamental in the model for realistic simulation of chlorophyll. Silicate is the primary limiting nutrient in diatom bloom in the subsurface chlorophyll maxima with maximum limitation occurring during the winter season, due to the deeper silicicline as compared to shallower nitricline. At the surface, both nitrogen and silicate co-limit the total production; however, nitrogen is a stronger limiter than silicate from March to June. The study highlights the relative role of silicate versus total nitrogen (nitrate + ammonium) in limiting primary production in the AS. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	bio-Argo and ship observations; ecosystem modeling; NEMURO; nutrient cycling; nutrient growth limitation; The Arabian Sea
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/186829
作者单位	Development of Skilled Manpower in Earth System Sciences (DESK), Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India; Department of Meteorology and Oceanography, College of Science and Technology, Andhra University, Visakhapatnam, India; Centre for Marine Living Resources and Ecology (CMLRE)Kerala, India
推荐引用方式 GB/T 7714	Anju M.,Sreeush M.G.,Valsala V.,et al. Understanding the Role of Nutrient Limitation on Plankton Biomass Over Arabian Sea Via 1-D Coupled Biogeochemical Model and Bio-Argo Observations[J],2020,125(6).
APA	Anju M..,Sreeush M.G..,Valsala V..,Smitha B.R..,Hamza F..,...&Naidu C.V..(2020).Understanding the Role of Nutrient Limitation on Plankton Biomass Over Arabian Sea Via 1-D Coupled Biogeochemical Model and Bio-Argo Observations.Journal of Geophysical Research: Oceans,125(6).
MLA	Anju M.,et al."Understanding the Role of Nutrient Limitation on Plankton Biomass Over Arabian Sea Via 1-D Coupled Biogeochemical Model and Bio-Argo Observations".Journal of Geophysical Research: Oceans 125.6(2020).