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المؤلفAl-Thani, Jassem A.
المؤلفIzumi, Connor
المؤلفYigiterhan, Oguz
المؤلفAl-Ansari, Ebrahim Mohd A S
المؤلفVethamony, Ponnumony
المؤلفSorino, Caesar Flonasca
المؤلفAnderson, Dan
المؤلفMurray, James W.
تاريخ الإتاحة2020-10-22T06:59:11Z
تاريخ النشر2020
اسم المنشورQatar University Annual Research Forum & Exhibition 2020
الاقتباسAlThani J.A., Izumi C., Yigiterhan O., AlAnsari E.M.A.S., Vethamony P., Sorino C.F., Anderson D., Murray J.W., "Ocean Acidification and Carbonate System Geochemistry in the Arabian Gulf", Qatar University Annual Research Forum and Exhibition (QUARFE 2020), Doha, 2020, https://doi.org/10.29117/quarfe.2020.0030
معرّف المصادر الموحدhttps://doi.org/10.29117/quarfe.2020.0030
معرّف المصادر الموحدhttp://hdl.handle.net/10576/16565
الملخصAlkalinity (Alk) and (Dissolved Inorganic Carbon) DIC were measured on high resolution seawater samples, collected on November 2018 and May 2019 at seven stations in the Exclusive Economic Zone (EEZ) of Qatar. Calculated surface PCO2 averaged 472 matm in 2018 and 447 matm in 2019. Thus: the Arabian Gulf is degassing CO2 at present and will not take up atmospheric CO2 until 2042. Ocean acidification is not yet an issue in the EEZ of Qatar. The elevated PCO2 values are due to CaCO3 formation. Normalized NAlk and NDIC were calculated to remove the impact of increasing salinity. NAlk and NDIC decrease corresponding to a CaCO3/OrgC removal ratio of 2/1. We calculated the nitrate corrected and salinity normalized tracer, Alk*. Values of Alk* were negative, and the change in Alk* relative to Hormuz (DAlk*) indicated that there has been an average decrease of Alk* of -130 mmol kg-1. This decrease is due to CaCO3 formation but previous studies found no evidence for coccolithophorids. One obvious possibility is that Alk removal is due to CaCO3 formation in coral reefs. However, recent study of the composition of particulate matter found that the average particulate Ca concentration was 3.6%, and was easily acid soluble (Yigiterhan et al, 2018). These results suggest that a significant amount of particulate CaCO3 is present in the water column. One hypothesis is that the particulate Ca comes from carbonate rich atmospheric dust. Using Al as a tracer for dust and the average Ca/Al ratio in Qatari dust can only explain about 3% of the particulate Ca. An alternative hypothesis is that particulate CaCO3 may form in the water column due to abiological CaCO3 formation, as proposed recently for the Red Sea (Wurgaft et al., 2016). Precipitation of CaCO3 may be induced by the large inputs of nucleation sites in the form of atmospheric dust.
اللغةen
الناشرQatar University Press
الموضوعOcean Acidification
Marine Geochemistry
Climate Change
Marine Environment
Arabian Gulf.
العنوانOcean Acidification and Carbonate System Geochemistry in the Arabian Gulf
النوعPoster
dc.accessType Open Access


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