DOI: 10.1029/2017GB005868
论文题名: Lateral Transport of N-Rich Dissolved Organic Matter Strengthens Phosphorus Deficiency in Western Subtropical North Atlantic
作者: Vidal M. ; Aspillaga E. ; Teixidor-Toneu I. ; Delgado-Huertas A.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 9 语种: 英语
英文关键词: 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)
学科: dissolved organic nutrients
; dissolved organic phosphorus lability
; isotopic nitrogen fractionation
; subtropical North Atlantic
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160201
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Global Biogeochemical Cycles,2018-01-01,32(9)