Preliminary assessment of carbonic acid dissociation constants: Insights from observations in China's east coastal oceans

被引：1

作者：

Wang, Ping ^{[1
,2
,3
]}

Meng, Qicheng ^{[2
,4
]}

Xue, Liang ^{[3
]}

Zhao, Yuhang ^{[3
]}

Qiao, Hao ^{[1
,3
]}

Hu, He ^{[3
]}

Wei, Qinsheng ^{[3
]}

Xin, Ming ^{[3
]}

Ran, Xiangbin ^{[3
]}

Han, Chenhua ^{[2
,4
]}

Zhou, Feng ^{[2
,4
]}

Liu, Chunying ^{[1
]}

机构：

[1] Ocean Univ China, Coll Chem & Chem Engn, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

[2] Minist Nat Resources, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Peoples R China

[3] Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Peoples R China

[4] Minist Nat Resources, Observat & Res Stn Yangtze River Delta Marine Ecos, Zhoushan, Peoples R China

来源：

MARINE ENVIRONMENTAL RESEARCH | 2023年 / 192卷

基金：

中国国家自然科学基金;

关键词：

Acidification; pH; Carbonic acid dissociation constants; Internal consistency; Total alkalinity; Dissolved inorganic carbon; Carbon cycling; Coastal waters; SYNTHETIC SEA-WATER; INORGANIC CARBON; INTERNAL CONSISTENCY; MARINE ECOSYSTEMS; SATURATION STATE; CRESOL PURPLE; ARCTIC-OCEAN; RIVER PLUME; CO2; SYSTEM; ACIDIFICATION;

D O I：

10.1016/j.marenvres.2023.106219

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Based on observations in China's east coastal oceans, we conducted a preliminary assessment of 16 sets of carbonic acid dissociation constants (K1* and K2*) by comparing spectrophotometrically measured pH values at 25 degrees C with those calculated from total alkalinity and dissolved inorganic carbon. We obtained that K1* and K2* often performed differently within different salinity ranges, and that the constants of Millero et al. (2002) (M02) demonstrated the best performance for the salinity range of 24-35. In contrast, the often recommended constants of Mehrbach et al. (1973) refit by Dickson and Millero (1987) (DM87-M) and Lucker et al. (2000) (L00) would underestimate pH at salinities of 24-30. This was mainly associated with the higher product of K1* and K2* by DM87-M and L00 than by M02 at this salinity range. Also, we found almost no differences between pH values calculated with DM87-M and L00.

引用

页数：10