Temperature coefficient of seawater pH as a function of temperature,pH,DIC and salinity

作     者：Yubin Hu Yubin Hu

作者机构：Institute of Marine Science and TechnologyShandong UniversityQingdao 266237China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2022年第41卷第6期

页      面：114-118页

核心收录：

学科分类：0710[理学-生物学] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 

基　　金：The National Natural Science Foundation of China under contract No.41806094 the Young Scholars Program of Shandong University under contract No.2018WLJH43 

主　　题：temperature coefficient pH measurement CO2SYS sea ice ocean acidification 

摘      要：pH is a measure of the hydrogen ion activity in a solution,which is a function of *** normal seawater conditions,it is well ***,with an increasing interest in complex environments(e.g.,sea ice),a better understanding of the temperature change on pH under extreme conditions is *** objective of this paper was to investigate the temperature coefficient of the seawater pH(△pH/△T)over a wide range of temperature,pH,dissolved inorganic carbon(DIC)and salinity by a method of continuous pH measurement with the temperature change,and to verify the application of CO2SYS for pH conversion under extreme conditions(on the National Bureau of Standards(NBS)scale and the total proton scale).Both experimental results and CO2SYS calculations showed that△pH/△T was slightly affected by temperature over the range of 0℃ to 40℃ and by pH(at 25℃)from 7.8 to ***,when pH was out of this range,△pH/△T varied greatly with pH *** to the experimental results,changes in DIC from 1 mmol/kg to 5 mmol/kg and salinity from 20 to 105 had no significant effect on△pH/△***2SYS calculations showed a slight increase in△pH/△T with DIC on both the NBS scale and the total proton scale;and underestimated△pH/△T at high salinity(i.e.,beyond the oceanographic range)on the NBS ***,CO2SYS is still suitable for pH conversion even under extreme conditions by simply setting the input values of DIC and salinity in CO2SYS within the oceanographic range(e.g.,DIC=2 mmol/kg and S=35).