Sea surface aragonite saturation state variations and control mechanisms at the Gray's Reef time-series site off Georgia, USA (2006-2007)

doi:10.1016/j.marchem.2017.05.009

	Sea surface aragonite saturation state variations and control mechanisms at the Gray's Reef time-series site off Georgia, USA (2006-2007)
	Xue, Liang 1,2,3; Cai, Wei-Jun 3; Sutton, Adrienne J.4,5; Sabine, Christopher 4
刊名	MARINE CHEMISTRY
	2017-10-20
卷号	195 页码:27-40
关键词	Aragonite saturation state Time-series Coastal waters South Atlantic Bight
ISSN号	0304-4203
DOI	10.1016/j.marchem.2017.05.009
英文摘要	We report an annual cycle of surface seawater aragonite mineral saturation state (Omega(arag)) during 2006-2007 at the Gray's Reef time-series site off Georgia, USA, calculated based on three-hourly observations of carbon dioxide partial pressure (pCO(2)) and salinity-derived total alkalinity. Omega(arag) varied between 2.30 and 4.39 with low values ( < 3.00) mainly during February-April 2007 and high values ( > 3.50) during July-October 2006 and July September 2007 as well as during two biological production spikes (April June 2007). We first present a qualitative analysis of the drivers of Omega(arag) variability based on property regressions with surface temperature, salinity and apparent oxygen utilization, and then quantify the contributions of temperature, air-sea exchange, mixing, and biological processes to monthly Omega(arag), net changes using a simple 1-D mass budget model. Our analyses suggest that river inputs played the most important role in the seasonal variation of surface Omega(arag), in contrast to temperature control on pCO(2). Nevertheless, the primary processes controlling monthly Omega(arag) net change varied with time of year. Furthermore, river inputs lowered Omega(arag) by 0.28 and 0.48 in July-August and September October 2007 relative to the equivalent periods of 2006. This implies that interannual Omega(arag) variability at this location may be greater than that due to the influence of increased atmospheric CO2 over the past few decades, making efforts to discern decadal coastal ocean acidification trends particularly challenging. In addition, although sea surface salinity varies substantially in coastal waters, our analysis suggests that similar to the open ocean Omega(arag) is essentially determined by carbonate ion concentration ([CO32-]), not calcium ion concentration ([Ca2+]) or the stoichiometric solubility product (K'(sp)), both varying substantially with salinity. Finally, we show that the difference between total alkalinity (TA) and dissolved inorganic carbon (DIC) is a better proxy for [CO32-] and Omega(arag) compared with the ratio (TA/DIC) and helps to better elucidate processes affecting Omega(arag) in coastal oceans.
资助项目	National Natural Science Foundation of China[41506099]
WOS关键词	OCEAN ACIDIFICATION ; INORGANIC CARBON ; CONTINENTAL-SHELF ; TEMPORAL-CHANGES ; UNITED-STATES ; CO2 ; SEAWATER ; DIOXIDE ; SYSTEM ; WATERS
WOS研究方向	Chemistry ; Oceanography
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000412786800004
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25778]
专题	自然资源部第一海洋研究所
通讯作者	Cai, Wei-Jun
作者单位	1.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Peoples R China 3.Univ Delaware, Sch Marine Sci & Policy, Newark, DE 19716 USA 4.NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA 5.Univ Washington, Joint Inst Study Atmosphere & Ocean, Seattle, WA 98115 USA
推荐引用方式 GB/T 7714	Xue, Liang,Cai, Wei-Jun,Sutton, Adrienne J.,et al. Sea surface aragonite saturation state variations and control mechanisms at the Gray's Reef time-series site off Georgia, USA (2006-2007)[J]. MARINE CHEMISTRY,2017,195:27-40.
APA	Xue, Liang,Cai, Wei-Jun,Sutton, Adrienne J.,&Sabine, Christopher.(2017).Sea surface aragonite saturation state variations and control mechanisms at the Gray's Reef time-series site off Georgia, USA (2006-2007).MARINE CHEMISTRY,195,27-40.
MLA	Xue, Liang,et al."Sea surface aragonite saturation state variations and control mechanisms at the Gray's Reef time-series site off Georgia, USA (2006-2007)".MARINE CHEMISTRY 195(2017):27-40.