气候变化领域集成服务门户(CCPortal): Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings

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DOI	10.5194/bg-21-177-2024
	Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings
	Ono, Tsuneo; Muraoka, Daisuke; Hayashi, Masahiro; Yorifuji, Makiko; Dazai, Akihiro; Omoto, Shigeyuki; Tanaka, Takehiro; Okamura, Tomohiro; Onitsuka, Goh; Sudo, Kenji; Fujii, Masahiko; Hamanoue, Ryuji; Wakita, Masahide
发表日期	2024
ISSN	1726-4170
EISSN	1726-4189
起始页码	21
结束页码	1
卷号	21 期号:1
英文摘要	The pH of coastal seawater varies based on several local forcings, such as water circulation, terrestrial inputs, and biological processes, and these forcings are changing along with global climate change. Understanding the mechanism of pH variation in each coastal area is thus important for a realistic future projection that considers changes in these forcings. From 2020 to 2021, we performed parallel year-round observations of pH and related ocean parameters at five stations around the Japanese coast (Miyako Bay, Shizugawa Bay, Kashiwazaki Coast, Hinase Archipelago, and Ohno Strait) to understand the characteristics of short-term pH variations and their forcings. Annual variability (similar to 1 standard deviation) of pH and aragonite saturation state (Omega(ar)) were 0.05-0.09 and 0.25-0.29, respectively, for three areas with low anthropogenic pressures (Miyako Bay, Kashiwazaki Coast, and Shizugawa Bay), while it increased to 0.16-0.21 and 0.52-0.58, respectively, in two areas with medium anthropogenic pressures (Hinase Archipelago and Ohno Strait in Seto Inland Sea). Statistical assessment of temporal variability at various timescales revealed that most of the annual variabilities in both pH and Omega(ar) were derived by short-term variation at a timescale of <10 d, rather than seasonal-scale variation. Our analyses further illustrated that most of the short-term pH variation was caused by biological processes, while both thermodynamic and biological processes equally contributed to the temporal variation in Omega(ar). The observed results showed that short-term acidification with Omega(ar) < 1.5 occurred occasionally in Miyako and Shizugawa bays, while it occurred frequently in the Hinase Archipelago and Ohno Strait. Most of such short-term acidified events were related to short-term low-salinity events. Our analyses showed that the amplitude of short-term pH variation was linearly correlated with that of short-term salinity variation, and its regression coefficient at the time of high freshwater input was positively correlated with the nutrient concentration of the main river that flows into the coastal area.
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS记录号	WOS:001173397500001
来源期刊	BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303768
作者单位	Japan Fisheries Research & Education Agency (FRA); Japan Fisheries Research & Education Agency (FRA); Japan Fisheries Research & Education Agency (FRA); University of Tokyo; Hokkaido University; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); National Institute of Advanced Industrial Science & Technology (AIST)
推荐引用方式 GB/T 7714	Ono, Tsuneo,Muraoka, Daisuke,Hayashi, Masahiro,et al. Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings[J],2024,21(1).
APA	Ono, Tsuneo.,Muraoka, Daisuke.,Hayashi, Masahiro.,Yorifuji, Makiko.,Dazai, Akihiro.,...&Wakita, Masahide.(2024).Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings.BIOGEOSCIENCES,21(1).
MLA	Ono, Tsuneo,et al."Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings".BIOGEOSCIENCES 21.1(2024).