Program
 
General Session 2: Marine & estuarine biogeochemistry
 
 
 
Poster
Diurnal variations of carbonate system in the Pearl River estuary and adjacent shelf during summer
GS2-55-S
Chia-Lin Yu* , Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Wei-Jen Huang, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Jay Lee, Taiwan Ocean Research Institute, National Research Laboratories, Kaohsiung, Taiwan
Bing-Rong Jiang, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Ray T. Hsu, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Ting-Hsuan Huang, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Yu-Shih Lin, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
James T. Liu, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Chen-Tung Arthur Chen, Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
Presenter Email: s900098840617@gmail.com
With only covering 7% of the ocean surface area, the marginal seas contribute 15¨C21% of the oceanic CO2 uptake from the atmosphere. Nevertheless, most previous coastal studies focused on the spatial distribution of carbonate system and only a few studies focused on their diurnal temporal changes. In this study, we collected water samples every a few hours at a fixed station in the Pearl River estuary and adjacent shelf from June 3rd to 4th and also from July 24th to 29th, respectively, to determine the temporal variations of seawater pH, dissolved inorganic carbon (DIC), total alkalinity (TA) and partial pressure of CO2. The preliminary result in June shows that salinities were clearly different in between the surface water (3 m, salinity 20.0-22.1) and the bottom water (27.5 m, salinity 34.2-34.6). Surface water DIC (1445.5-1570.4 ¦̀mol kg-1) and TA (1829.2-1873.7 ¦̀mol L-1) were also lower than the bottom water (DIC 2016.9- 2040.7 ¦̀mol kg-1, TA 2258.8-2275.9 ¦̀mol L-1), but pH (8.333- 8.517) were higher than bottom ones (pH 7.930-7.957). All TA samples had a linear relationship with salinities, showing the importance of mixing in this study area. In this study, we will discuss the temporal variations of physical mixing and biological process involved in the above parameters.