DOI: 10.1002/2015GL063655
论文题名: Seasonal variability and fluxes of nitrate in the surface waters over the Arctic shelf slope
作者: Randelhoff A. ; Sundfjord A. ; Reigstad M.
刊名: Geophysical Research Letters
ISSN: 0094-9120
EISSN: 1944-8851
出版年: 2015
卷: 42, 期: 9 起始页码: 3442
结束页码: 3449
语种: 英语
英文关键词: Arctic
; nitrate
; primary production
; seasonal cycle
; shelf
Scopus关键词: Water levels
; Arctic
; Chlorophyll a fluorescence
; Maximum concentrations
; Primary production
; Primary productivity
; Seasonal cycle
; Seasonal variability
; Shelf
; Nitrates
; concentration (composition)
; nitrate
; primary production
; seasonal variation
; shelf sea
; surface water
; time series
; Arctic Ocean
英文摘要: Understanding the present state and possible future scenarios of Arctic Ocean primary productivity has been hampered by the scarcity of year-round nutrient measurements. Here the first yearlong moored time series of near-surface nitrate concentrations in the Eastern Arctic, together with hydrography, currents, and chlorophyll a fluorescence, is reported from the shelf slope northeast of Svalbard. Variability was dominated by the inflow of Atlantic Water (AW). Nitrate was near depleted during July-September and reached a maximum concentration of 10μM in March. Vertical nitrate gradients were eroded by mid-December, demonstrating the importance of the AW in breaking down upper ocean stratification during fall. Upward nitrate fluxes through the nitracline in the AW inflow region during fall were 2.5 ± 0.5mmolm-2d-1. The spring bloom triggered extensive nitrate drawdown from June, from which an annual new production of 31gCm-2 was estimated. Key Points First year-round moored observations of nitrate in the Eastern Arctic Ocean Vertical nitrate fluxes are supported by weakened stratification in fall Nitrate near depletion indicates nutrient limitation of annual new production ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930479017&doi=10.1002%2f2015GL063655&partnerID=40&md5=1e8bfb18258f1efd911578c36d6687e2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8736
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute for Arctic and Marine Biology, University of Tromsø, Tromsø, Norway
Recommended Citation:
Randelhoff A.,Sundfjord A.,Reigstad M.. Seasonal variability and fluxes of nitrate in the surface waters over the Arctic shelf slope[J]. Geophysical Research Letters,2015-01-01,42(9).