气候变化领域集成服务门户(CCPortal): Long-Term Changes of Carbonate Chemistry Variables Along the North American East Coast

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DOI	10.1029/2019JC015982
	Long-Term Changes of Carbonate Chemistry Variables Along the North American East Coast
	Xu Y.-Y.; Cai W.-J.; Wanninkhof R.; Salisbury J.; Reimer J.; Chen B.
发表日期	2020
ISSN	21699275
卷号	125 期号:7
英文摘要	Decadal variability of carbonate chemistry variables has been studied for the open ocean using observations and models, but less is known about the variations in the coastal ocean due to observational gaps and the more complex environments. In this work, we use a Bayesian-neural-network approach to reconstruct surface carbonate chemistry variables for the Mid-Atlantic Bight (MAB) and the South Atlantic Bight (SAB) along the North American East Coast from 1982 to 2015. The reconstructed monthly time series data suggest that the rate of fCO2 increase in the MAB (18 ± 1 μatm per decade) is faster than those in the SAB (14 ± 1 μatm per decade) and the open ocean (14 ± 1 μatm per decade). Correspondingly, pH decreases faster in the MAB. The observed stagnation in the aragonite saturation state, Ωarag decrease during 2005–2015 in the MAB, is attributed to the intrusion of water from southern and offshore regions with high Ωarag, which offsets the decrease expected from anthropogenic CO2 uptake. Furthermore, seasonal asymmetry in the evolution of long-term change leads to the faster change in the amplitudes of the seasonal cycle in carbonate chemistry variables in coastal waters than those in the open ocean. In particular, the increase in the seasonal-cycle amplitude of dissolved inorganic carbon in the MAB is 2.9 times larger than that of the open ocean. This leads to the faster increase in the season-cycle amplitude of Ωarag and earlier occurrence of undersaturation in coastal waters as acidification continues. ©2020. The Authors.
英文关键词	carbonate chemistry; coastal acidification; long-term change; Mid-Atlantic Bight; South Atlantic Bight
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186814
作者单位	School of Marine Science and Policy, University of Delaware, Newark, DE, United States; Now at Cooperative Institute for Marine and Atmospheric Studies, University of Miami, Miami, FL, United States; NOAA Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; Ocean Processes Analysis Laboratory, University of New Hampshire, Durham, NH, United States
推荐引用方式 GB/T 7714	Xu Y.-Y.,Cai W.-J.,Wanninkhof R.,et al. Long-Term Changes of Carbonate Chemistry Variables Along the North American East Coast[J],2020,125(7).
APA	Xu Y.-Y.,Cai W.-J.,Wanninkhof R.,Salisbury J.,Reimer J.,&Chen B..(2020).Long-Term Changes of Carbonate Chemistry Variables Along the North American East Coast.Journal of Geophysical Research: Oceans,125(7).
MLA	Xu Y.-Y.,et al."Long-Term Changes of Carbonate Chemistry Variables Along the North American East Coast".Journal of Geophysical Research: Oceans 125.7(2020).