Aquatic Geochemistry
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Published By Springer-Verlag

1573-1421, 1380-6165

Author(s):  
M. Spieckermann ◽  
A. Gröngröft ◽  
M. Karrasch ◽  
A. Neumann ◽  
A. Eschenbach

AbstractThe resuspension of sediment leads to an increased release of nutrients and organic substances into the overlying water column, which can have a negative effect on the oxygen budget. Especially in the warmer months with a lower oxygen saturation and higher biological activity, the oxygen content can reach critical thresholds in estuaries like the upper Elbe estuary. Many studies have dealt with the nutrient fluxes that occur during a resuspension event. However, the sediment properties that influence the oxygen consumption potential (OCP) and the different biochemical processes have not been examined in detail. To fill this gap, we investigated the biogeochemical composition, texture, and OCP of sediments at 21 locations as well as the temporal variability within one location for a period of 2 years (monthly sampling) in the upper Elbe estuary. The OCP of sediments during a seven-day resuspension event can be described by the processes of sulphate formation, nitrification, and mineralisation. Chlorophyll, total nitrogen (Ntotal), and total organic carbon showed the highest correlations with the OCP. Based on these correlations, we developed a prognosis model to calculate the OCP for the upper Elbe estuary with a single sediment parameter (Ntotal). The model is well suited to calculate the oxygen consumption of resuspended sediments in the Hamburg port area during the relevant warmer months and shows a normalised root mean squared error of < 0.11 ± 0.13. Thus, the effect of maintenance measures such as water injection dredging and ship-induced wave on the oxygen budget of the water can be calculated.


Author(s):  
Samuel A. H. Kekuewa ◽  
Travis A. Courtney ◽  
Tyler Cyronak ◽  
Theodor Kindeberg ◽  
Bradley D. Eyre ◽  
...  

Author(s):  
Congrong Yu ◽  
Ying Li ◽  
Huijun Jin ◽  
Qiang Ma ◽  
Zhongbo Yu ◽  
...  

Author(s):  
Hitomi Nakamura ◽  
Hikaru Iwamori ◽  
Noritoshi Morikawa ◽  
Natalia Kharitonova ◽  
Georgy Chelnokov ◽  
...  

AbstractSpring waters with high-pCO2 content are widely distributed in the Sikhote-Alin region in Russia. Mukhen spa is one such spring located in the northern Sikhote-Alin region. This spa has two types of upwelling spring waters and exhibits distinct chemical signatures. One of the springs originates from a shallow aquifer and features hydrogen and oxygen isotopic ratios of meteoric water with a high 3He/4He ratio, whereas the other originates from a deeper aquifer and features a distinctly negative δ18O with a lower 3He/4He ratio. To understand this apparent discrepancy and the water circulation dynamics beneath Mukhen springs, we utilized all published data concerning the major solute elements and isotopic ratios of Mukhen spring waters and compared them with the He isotopic compositions on several springs in the far eastern region, which are newly analyzed in this study. The results show that the shallow aquifer comprises meteoric water that interacts with the crust enhanced by the gas component welling up from deep underground, while the fluid in deep aquifer fingerprinted the hydration reaction of silicate and involves a mantle component possibly delivered by a deep-seated fluid and/or gas upwelling along the tectonic fault through the western margin of the Sikhote-Alin region.


Author(s):  
Katie A. Albanese ◽  
Mrinal Chakraborty ◽  
Christopher M. Hadad ◽  
Yu-Ping Chin
Keyword(s):  

Author(s):  
George W. Luther III ◽  
Jennifer S. Karolewski ◽  
Kevin M. Sutherland ◽  
Colleen M. Hansel ◽  
Scott D. Wankel

Author(s):  
Baby Krishnan Nisha ◽  
Keshava Balakrishna ◽  
Harikripa Narayana Udayashankar ◽  
Busnur Rachotappa Manjunatha

AbstractStudies done on small tropical west-flowing river catchments located in the Western Ghats in southwestern India have suggested very intense chemical weathering rates and associated CO2 consumption. Very less studies are reported from these catchments notwithstanding their importance as potential sinks of atmospheric CO2 at the global scale. A total of 156 samples were collected from a small river catchment in the southwestern India, the Payaswini–Chandragiri river Basin, during pre-monsoon, monsoon and post-monsoon seasons in 2016 and 2017, respectively. This river system comprises two small rivers originating at an elevation of 1350 m in the Western Ghats in peninsular India. The catchment area is dominated by biotite sillimanite gneiss. Sodium is the dominant cation, contributing ~ 50% of the total cations, whereas HCO3− contributes ~ 75% of total anions. The average anion concentration in the samples varied in the range HCO3− > Cl− > SO42− > NO3− > F−, whereas major cation concentration varied in the range Na+  > Ca2+  > Mg2+  > K+. The average silicate weathering rate (SWR) was 42 t km−2 y−1 in the year 2016 and 36 t km−2 y−1 in 2017. The average annual carbon dioxide consumption rate (CCR) due to silicate rock weathering was 9.6 × 105 mol km−2y−1 and 8.3 × 105 mol km−2 y−1 for 2016 and 2017, respectively. The CCR in the study area is higher than other large tropical river catchments like Amazon, Congo-Zaire, Orinoco, Parana and Indus because of its unique topography, hot and humid climate and intense rainfall.


Author(s):  
Elena V. Cherkasova ◽  
Artem A. Konyshev ◽  
Evgeniya A. Soldatova ◽  
Evgeniya S. Sidkina ◽  
Mikhail V. Mironenko

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