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DOI	10.1029/2018GB006068
	Factors Regulating Nitrification in the Arctic Ocean: Potential Impact of Sea Ice Reduction and Ocean Acidification
	Shiozaki T.; Ijichi M.; Fujiwara A.; Makabe A.; Nishino S.; Yoshikawa C.; Harada N.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1085
结束页码	1099
卷号	33 期号:8
英文摘要	Nitrification is susceptible to changes in light and pH and, thus, could be influenced by recent sea ice reductions and acidification in the Arctic Ocean. We investigated the sensitivity of nitrification to light, pH, and substrate availability in a natural nitrifier community of the Arctic Ocean. Nitrification was active near the bottom of the shelf region (<60 m) and in the halocline layer (50–200 m) of the Arctic basin, where ammonium was abundant, but was low in the ammonium-depleted Atlantic layer (>250 m). In pH control experiments, nitrification rates significantly declined when the pH was manipulated to be 0.22 lower than the controls. However, nitrification was relatively insensitive to changes in pH compared to changes in light. Light control experiments showed that nitrification was inhibited by a light intensity above 0.11 mol photons m−2 day−1, which was presumably the light threshold. A light intensity greater than the light threshold extended to the shelf bottom and upper halocline layer, limiting nitrification in these waters. Satellite data analyses indicated that the area where light levels inhibit nitrification has increased throughout the Arctic Ocean due to the recent sea ice reduction, which may lead to a declining trend in nitrification. Our results suggest that stronger light levels in the future Arctic Ocean could further suppress nitrification and alter the composition of inorganic nitrogen, with implications for the structure of ecosystems. ©2019. The Authors.
英文关键词	Arctic Ocean; nitrification; nitrogen cycling; ocean acidification; sea ice reduction
语种	英语
scopus关键词	acidification; ammonium; halocline; light intensity; nitrification; nitrogen cycle; reduction; sea ice; substrate; Arctic Ocean; Atlantic Ocean
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/129717
作者单位	Earth Surface System Research Center, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan; Institute of Arctic Climate and Environment Research, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Project Team for Development of New-generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
推荐引用方式 GB/T 7714	Shiozaki T.,Ijichi M.,Fujiwara A.,et al. Factors Regulating Nitrification in the Arctic Ocean: Potential Impact of Sea Ice Reduction and Ocean Acidification[J],2019,33(8).
APA	Shiozaki T..,Ijichi M..,Fujiwara A..,Makabe A..,Nishino S..,...&Harada N..(2019).Factors Regulating Nitrification in the Arctic Ocean: Potential Impact of Sea Ice Reduction and Ocean Acidification.Global Biogeochemical Cycles,33(8).
MLA	Shiozaki T.,et al."Factors Regulating Nitrification in the Arctic Ocean: Potential Impact of Sea Ice Reduction and Ocean Acidification".Global Biogeochemical Cycles 33.8(2019).