scholarly journals Geochemical characteristics of sediment-pore water systems associated with hydrothermal activity at South Okinawa Trough

2021 ◽  
Author(s):  
Feng-Hsin Hsu ◽  
Chih-Chieh Su ◽  
Hsiao-Fen Lee ◽  
Yu-Shih Lin ◽  
Chung Wu ◽  
...  
Keyword(s):  
Pore Water ◽  
Okinawa Trough ◽  
Hydrothermal Activity ◽  
Water Systems ◽  
Geochemical Characteristics ◽  
Sediment Pore Water

Equilibrium passive sampling as a tool to study polycyclic aromatic hydrocarbons in Baltic Sea sediment pore-water systems

2015 ◽  
Vol 101 (1) ◽  
pp. 296-303 ◽  
Author(s):  
Susann-Cathrin Lang ◽  
Andrew Hursthouse ◽  
Philipp Mayer ◽  
Danjiela Kötke ◽  
Ines Hand ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Baltic Sea ◽  
Pore Water ◽  
Aromatic Hydrocarbons ◽  
Passive Sampling ◽  
Water Systems ◽  
Sediment Pore Water ◽  
Polycyclic Aromatic

scholarly journals Sediment–Pore Water System Associated with Native Sulfur Formation at Jade Hydrothermal Field in Okinawa Trough

2014 ◽  
pp. 405-419
Author(s):  
Yuka Yokoyama ◽  
Yoshio Takahashi ◽  
Youko Miyoshi ◽  
Jun-ichiro Ishibashi ◽  
Shinsuke Kawagucci
Keyword(s):  
Pore Water ◽  
Okinawa Trough ◽  
Water System ◽  
Hydrothermal Field ◽  
Sediment Pore Water ◽  
Native Sulfur

Sorption and Desorption Behavior of Organotin Compounds in Sediment−Pore Water Systems

2001 ◽  
Vol 35 (15) ◽  
pp. 3151-3157 ◽  
Author(s):  
Michael Berg ◽  
Cédric G. Arnold ◽  
Stephan R. Müller ◽  
Jürg Mühlemann ◽  
René P. Schwarzenbach
Keyword(s):  
Pore Water ◽  
Water Systems ◽  
Organotin Compounds ◽  
Sediment Pore Water

Internal Metal Distribution in Sediment - Pore Water - Water Systems of Bights at Nasser Lake, Egypt

2011 ◽  
Vol 33 (2) ◽  
pp. 133-168
Author(s):  
M. E. Soltan ◽  
S. M. N. Moalla ◽  
M. N. Rashed ◽  
E. M. Fawzy
Keyword(s):  
Pore Water ◽  
Water Systems ◽  
Metal Distribution ◽  
Sediment Pore Water ◽  
Nasser Lake

Geochemical characteristics of heavy metals in riparian sediment pore water of Songhua River, Northeast China

2011 ◽  
Vol 21 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Hui Zhu ◽  
Baixing Yan ◽  
Xiaofeng Pan ◽  
Yuhong Yang ◽  
Lixia Wang
Keyword(s):  
Heavy Metals ◽  
Pore Water ◽  
Northeast China ◽  
Geochemical Characteristics ◽  
Sediment Pore Water ◽  
Songhua River ◽  
Riparian Sediment

scholarly journals Archaeal Diversity and Distribution along Thermal and Geochemical Gradients in Hydrothermal Sediments at the Yonaguni Knoll IV Hydrothermal Field in the Southern Okinawa Trough

2009 ◽  
Vol 76 (4) ◽  
pp. 1198-1211 ◽  
Author(s):  
Takuro Nunoura ◽  
Hanako Oida ◽  
Miwako Nakaseama ◽  
Ayako Kosaka ◽  
Satoru B. Ohkubo ◽  
...  
Keyword(s):  
Pore Water ◽  
Deep Sea ◽  
Hydrothermal Fluid ◽  
Okinawa Trough ◽  
Wide Spectrum ◽  
Hydrothermal Field ◽  
Sediment Pore Water ◽  
Southern Okinawa Trough ◽  
Chemical Conditions ◽  
Physical And Chemical

ABSTRACT A variety of archaeal lineages have been identified using culture-independent molecular phylogenetic surveys of microbial habitats occurring in deep-sea hydrothermal environments such as chimney structures, sediments, vent emissions, and chemosynthetic macrofauna. With the exception of a few taxa, most of these archaea have not yet been cultivated, and their physiological and metabolic traits remain unclear. In this study, phylogenetic diversity and distribution profiles of the archaeal genes encoding small subunit (SSU) rRNA, methyl coenzyme A (CoA) reductase subunit A, and the ammonia monooxygenase large subunit were characterized in hydrothermally influenced sediments at the Yonaguni Knoll IV hydrothermal field in the Southern Okinawa Trough. Sediment cores were collected at distances of 0.5, 2, or 5 m from a vent emission (90°C). A moderate temperature gradient extends both horizontally and vertically (5 to 69°C), indicating the existence of moderate mixing between the hydrothermal fluid and the ambient sediment pore water. The mixing of reductive hot hydrothermal fluid and cold ambient sediment pore water establishes a wide spectrum of physical and chemical conditions in the microbial habitats that were investigated. Under these different physico-chemical conditions, variability in archaeal phylotype composition was observed. The relationship between the physical and chemical parameters and the archaeal phylotype composition provides important insight into the ecophysiological requirements of uncultivated archaeal lineages in deep-sea hydrothermal vent environments, giving clues for approximating culture conditions to be used in future culturing efforts.

scholarly journals Phosphorous Supply to a Eutrophic Artificial Lake: Sedimentary versus Groundwater Sources

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 563
Author(s):  
Wiebe Förster ◽  
Jan C. Scholten ◽  
Michael Schubert ◽  
Kay Knoeller ◽  
Nikolaus Classen ◽  
...  
Keyword(s):  
Water Quality ◽  
Stable Isotope ◽  
Pore Water ◽  
Lake Water ◽  
Sediment Cores ◽  
Eutrophic Lake ◽  
Stable Water Isotopes ◽  
Artificial Lake ◽  
Sediment Pore Water ◽  
Mass Balance Models

The eutrophic Lake Eichbaumsee, a ~1 km long and 280 m wide (maximum water depth 16 m) dredging lake southeast of Hamburg (Germany), has been treated for water quality improvements using various techniques (i.e., aeration plants, removal of dissolved phosphorous by aluminum phosphorous precipitation, and by Bentophos® (Phoslock Environmental Technologies, Sydney, Australia), adsorption) during the past ~15 years. Despite these treatments, no long-term improvement of the water quality has been observed and the lake water phosphorous content has continued to increase by e.g., ~670 kg phosphorous between autumn 2014 and autumn 2019. As no creeks or rivers drain into the lake and hydrological groundwater models do not suggest any major groundwater discharge into the lake, sources of phosphorous (and other nutrients) are unknown. We investigated the phosphorous fluxes from sediment pore water and from groundwater in the water body of the lake. Sediment pore water was extracted from sediment cores recovered by divers in August 2018 and February 2019. Diffusive phosphorous fluxes from pore water were calculated based on phosphorus gradients. Stable water isotopes (δ2H, δ18O) were measured in the lake water, in interstitial waters in the banks surrounding the lake, in the Elbe River, and in three groundwater wells close to the lake. Stable isotope (δ2H, δ18O) water mass balance models were used to compute water inflow/outflow to/from the lake. Our results revealed pore-water borne phosphorous fluxes between 0.2 mg/m2/d and 1.9 mg/m2/d. Assuming that the measured phosphorous fluxes are temporarily and spatially representative for the whole lake, about 11 kg/a to 110 kg/a of phosphorous is released from sediments. This amount is lower than the observed lake water phosphorous increase of ~344 kg between April 2018 and November 2018. Water stable isotope (δ2H, δ18O) compositions indicate a water exchange between an aquifer and the lake water. Based on stable isotope mass balances we estimated an inflow of phosphorous from the aquifer to the lake of between ~150 kg/a and ~390 kg/a. This result suggests that groundwater-borne phosphorous is a significant phosphorous source for the Eichbaumsee and highlights the importance of groundwater for lake water phosphorous balances.

scholarly journals Spectral Characterization of Dissolved Organic Matter in Seawater and Sediment Pore Water from the Arctic Fjords (West Svalbard) in Summer

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 202
Author(s):  
Meilian Chen ◽  
Ji-Hoon Kim ◽  
Sungwook Hong ◽  
Yun Kyung Lee ◽  
Moo Hee Kang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Pore Water ◽  
Phytoplankton Bloom ◽  
Ocean Surface ◽  
The Arctic ◽  
Sediment Pore Water ◽  
Ice Edge ◽  
Accumulation Trend ◽  
Arctic Fjords

Fjords in the high Arctic, as aquatic critical zones at the interface of land-ocean continuum, are undergoing rapid changes due to glacier retreat and climate warming. Yet, little is known about the biogeochemical processes in the Arctic fjords. We measured the nutrients and the optical properties of dissolved organic matter (DOM) in both seawater and sediment pore water, along with the remote sensing data of the ocean surface, from three West Svalbard fjords. A cross-fjord comparison of fluorescence fingerprints together with downcore trends of salinity, Cl−, and PO43− revealed higher impact of terrestrial inputs (fluorescence index: ~1.2–1.5 in seawaters) and glaciofluvial runoffs (salinity: ~31.4 ± 2.4 psu in pore waters) to the southern fjord of Hornsund as compared to the northern fjords of Isfjorden and Van Mijenfjorden, tallying with heavier annual runoff to the southern fjord of Hornsund. Extremely high levels of protein-like fluorescence (up to ~4.5 RU) were observed at the partially sea ice-covered fjords in summer, in line with near-ubiquity ice-edge blooms observed in the Arctic. The results reflect an ongoing or post-phytoplankton bloom, which is also supported by the higher levels of chlorophyll a fluorescence at the ocean surface, the very high apparent oxygen utilization through the water column, and the nutrient drawdown at the ocean surface. Meanwhile, a characteristic elongated fluorescence fingerprint was observed in the fjords, presumably produced by ice-edge blooms in the Arctic ecosystems. Furthermore, alkalinity and the humic-like peaks showed a general downcore accumulation trend, which implies the production of humic-like DOM via a biological pathway also in the glaciomarine sediments from the Arctic fjords.

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