气候变化领域集成服务门户(CCPortal): Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic

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DOI	10.1029/2017GB005868
	Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic
	Vidal M.; Aspillaga E.; Teixidor-Toneu I.; Delgado-Huertas A.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1350
结束页码	1366
卷号	32 期号:9
英文摘要	The ability of the subtropical North Atlantic to sustain export production despite the lack of available nutrients is fascinating. Subtropical gyres are expected to expand under a global warming scenario, so it is important to understand the mechanisms supplying the required nutrients. Current issues for the region concern the nutrient and metabolic balance, the origin of excess nitrogen and phosphorus shortage, and the maintenance of nitrogen fixation. We report data on the allocation of nitrogen and phosphorus in dissolved and suspended pools, the isotopic δ15N of suspended nitrogen, and the lability of dissolved organic phosphorus (DOP) along a section crossing the eastern seasonally stratified North Atlantic and the western subtropical North Atlantic (NASW). We find extreme P-deficiency in the NASW, with the highest dissolved inorganic N:P ratios located within the upperthermocline isopycnals (σϴ = 26.3–26.8). Our data indicate an important role of the midlatitude northeast seasonally stratified North Atlantic bringing dissolved organic matter (DOM) to the thermocline of the North Atlantic. The mineralization of N-rich DOM contributes to the N excess (P deficit) of the upperthermocline of NASW. We find lower concentrations of more reactive DOP in the western than in the eastern part of the transect, indicating an active role of DOP in the nutrition of microbial communities. Our results support recent hypotheses concerning the environmental controls of marine nitrogen fixation identifying the key role of DOP utilization. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	dissolved organic nutrients; dissolved organic phosphorus lability; isotopic nitrogen fractionation; subtropical North Atlantic
语种	英语
scopus关键词	dissolved organic matter; dissolved organic phosphorus; global warming; isotopic fractionation; mineralization; nitrogen fixation; nitrogen isotope; nutrient availability; nutrient cycling; subtropical region; suspended load; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129797
作者单位	Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona, Barcelona, Spain; Instituto Andaluz de Ciencias de la Tierra, CSIC, UGR, Granada, Spain
推荐引用方式 GB/T 7714	Vidal M.,Aspillaga E.,Teixidor-Toneu I.,et al. Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic[J],2018,32(9).
APA	Vidal M.,Aspillaga E.,Teixidor-Toneu I.,&Delgado-Huertas A..(2018).Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic.Global Biogeochemical Cycles,32(9).
MLA	Vidal M.,et al."Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic".Global Biogeochemical Cycles 32.9(2018).