scholarly journals Identification of black suspended particles in the algae-induced black bloom water column

2015 ◽  
Vol 27 (4) ◽  
pp. 591-598 ◽  
Author(s):  
SHEN Qiushi ◽  
◽  
FAN Chengxin
Keyword(s):  
Water Column ◽  
Suspended Particles ◽  
Bloom Water

Observations of the Particle Size Distribution and Concentration in a Coastal System using an In Situ Laser Analyzer

2002 ◽  
Vol 36 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Teresa Serra ◽  
Xavier Casamitjana ◽  
Jordi Colomer ◽  
Timothy C. Granata
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Water Column ◽  
Size Distribution ◽  
Posidonia Oceanica ◽  
High Energy ◽  
Suspended Particles ◽  
Energy Conditions ◽  
Coastal System

An in situ laser particle size analyzer (LISST-100, Sequoia Scientific, Inc.) has been used to study the particle size distribution and concentration of biological and non biological particles in the water column of a Mediterranean coastal system. Two field campaigns have been carried out during low and high energy conditions of the flow, caused by the passage of a storm front. For the low energy period, the water column remained stratified, whereas for the high energetic period the water column was warmer and well mixed. The first study dealt with the distribution of particles near the bottom of the coastal area. Here, two regions were taken into account. The first region was a sea-grass meadow of Posidonia oceanica and the second region was a barren sand area. The second study dealt with the determination of the vertical distribution of suspended particles in the whole water column of the system. The results showed a decrease in the vertical concentration of suspended particles in the water column with the passage of the storm front, which was associated with advection of warm water mass rather than by vertical mixing. In contrast, vertical resuspension determined the fate of suspended particles at the bottom of the water column and an increase of their concentration was found.

scholarly journals Large buoyant particles dominated by cyanobacterial colonies harbor distinct bacterial communities from small suspended particles and free‐living bacteria in the water column

2018 ◽  
Vol 7 (6) ◽  
pp. e00608 ◽  
Author(s):  
Limei Shi ◽  
Yaxin Huang ◽  
Min Zhang ◽  
Xiaoli Shi ◽  
Yuanfeng Cai ◽  
...  
Keyword(s):  
Water Column ◽  
Bacterial Communities ◽  
Suspended Particles ◽  
Free Living ◽  
Living Bacteria

The trace metal composition of suspended particles in the oceanic water column near Bermuda

1992 ◽  
Vol 111 (1) ◽  
pp. 155-174 ◽  
Author(s):  
Robert M. Sherrell ◽  
Edward A. Boyle
Keyword(s):  
Trace Metal ◽  
Water Column ◽  
Suspended Particles ◽  
Oceanic Water ◽  
Metal Composition

scholarly journals What can we learn from amino acids about oceanic organic matter cycling and degradation?

2021 ◽  
Author(s):  
Birgit Gaye ◽  
Niko Lahajnar ◽  
Natalie Harms ◽  
Sophie Anna Luise Paul ◽  
Tim Rixen ◽  
...  
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Deep Ocean ◽  
Principal Component ◽  
Suspended Particles ◽  
Organic Matter Cycling ◽  
Biogeochemical Indicators ◽  
Chemical Conditions

Abstract. Amino acids (AA) mainly bound in proteins are major constituents of living biomass and non-living organic material in the oceanic particulate and dissolved organic matter pool. Uptake and cycling by heterotrophic organisms lead to characteristic changes in AA composition so that AA based biogeochemical indicators are often used to elucidate processes of organic matter cycling and degradation. We analyzed particulate AA in a large sample set collected in various oceanic regions covering sinking and suspended particles in the water column, sediment samples as well as dissolved AA from water column and pore water samples. The aim of this study was to test and improve the use of AA derived biogeochemical indicators as proxies for organic matter sources and degradation, and to better understand particle dynamics and interaction between the dissolved and particulate organic matter pools. A principal component analysis (PCA) of all data delineates diverging AA compositions of sinking and suspended particles with increasing water depth. A new sinking particle and sediment degradation indicator (SDI) allows a fine-tuned classification of sinking particles and sediments with respect to the intensity of degradation, which is associated with changes of bulk δ15N ratios. This new indicator furthermore is sensitive to sedimentary redox conditions and can be used to detect past anoxic early diagenesis. A second indicator emerges from the AA spectra of suspended particulate matter (SPM) in the epipelagic and that of the meso- and bathypelagic ocean and is a residence time indicator (RTI). The characteristic changes in AA patterns from shallow to deep SPM are recapitulated in the AA spectra of the dissolved organic matter (DOM) pool, so that deep SPM is more similar to DOM than to any of the other organic matter pools. This implies that there is equilibration between finely dispersed SPM and DOM in the deep sea, which may be driven by microbial activity combined with annealing and fragmentation of gels. As these processes strongly depend on physico-chemical conditions in the deep ocean, changes in quality and degradability of DOM may strongly affect the relatively large pool of suspended and dissolved AA in the ocean that amounts to 15 Pg amino acid carbon (AAC) and 89 ± 29 Pg AAC, respectively.  

Crue éclair de juillet 1996 dans la région du Saguenay (Québec). 1. Impacts sur la colonne d'eau de la baie des Ha! Ha! et du fjord du Saguenay

1999 ◽  
Vol 56 (11) ◽  
pp. 2120-2135 ◽  
Author(s):  
Émilien Pelletier ◽  
Behzad Mostajir ◽  
Suzanne Roy ◽  
Michel Gosselin ◽  
Yves Gratton ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Water Column ◽  
Flash Flood ◽  
Physiological State ◽  
Biological Indicators ◽  
Suspended Particles ◽  
Zooplankton Species ◽  
Pelagic Ecosystem ◽  
Physical Chemical ◽  
Saguenay Fjord

A flash flood, which occurred in July 1996 in the Saguenay area (Quebec), transported millions of tons of sediment to the upstream section of the Saguenay Fjord and the Baie des Ha! Ha! in a few days. This first article reports the physical, chemical, and biological observations obtained for the water column in September 1996 and August 1997 and attempts to define indicators that can adequately characterize the effects of the flood on the water column. The chemical composition, the abundance, and the distribution of suspended particles clearly show the influence of the flood on the composition of particles in the water column of the bay and the fjord 2 months and even 1 year after the flood. However, biological indicators such as the abundance and the distribution of phytoplankton and zooplankton species determined in September 1996 are only slightly different between the Bay and the Fjord and show little difference with preflood data. The zooplankton physiological state appears to be a very good indicator of the health of the whole pelagic ecosystem.

Carbon cycling in the Sargasso Sea water column: Insights from lipid biomarkers in suspended particles

2018 ◽  
Vol 168 ◽  
pp. 248-278 ◽  
Author(s):  
R. Pedrosa-Pàmies ◽  
M.H. Conte ◽  
J.C. Weber ◽  
R. Johnson
Keyword(s):  
Water Column ◽  
Carbon Cycling ◽  
Sea Water ◽  
Suspended Particles ◽  
Lipid Biomarkers ◽  
Sargasso Sea

scholarly journals Features of the distribution of the suspended form of iron in the water column of the Caspian Sea

2021 ◽  
Author(s):  
В.В. Ковалев ◽  
К.Ю. Гамбург
Keyword(s):  
Surface Layer ◽  
Water Column ◽  
Caspian Sea ◽  
Chemical Elements ◽  
Suspended Particles ◽  
Solid Particles ◽  
Natural State ◽  
Caspian Basin ◽  
The Caspian Sea ◽  
Suspended Form

Статья посвящена изучению распределения железа в водной взвеси Среднего Каспия. Актуальность работыопределяется необходимостью оценки естественного состоя­ния морской среды и фиксации ее базового состояния (в том числе различных форм химических элементов) для дальнейшего использования с целью мониторинга экологической ситуации на шельфе Каспийского моря в условиях интенсификации геологоразве­дочных работ и разработки месторождений нефти. Цель работы. Установить характерные особенности поведения взвешенного железа в водах Среднего Каспия. Материалы и методы работы. Изучался материал, отобранный в 1989-1990 годах в ходе выполнения рейсов исследовательских судов. Принадлежащих Каспийскому НИИ рыбного хозяйства, до начала освоения нефтегазовых месторождений. Он представлен отфильтрованными частицами взвеси из 178 проб воды, взятых из различных слоев водной толщи на 63 станциях. Определение содержаний железа проводилось на спектрографе PGS-2 способом испарения. Результаты работы. Минимальные концентрации взвешенной формы железа в поверхностном слое водной толщи установлены на участке внутреннего шельфа и подводного склона котловины Среднего Каспия, что связано с выносом твердых частиц дрейфовыми течениями. Концентрации взвешенной формы железа в поверхностном слое возрастают к середине моря, что обусловлено стягиванием взвешенных частиц центростремительными силами циклонального течения. Придонный слой отличается повышенными концентрациями взвешенной формы железа. Возле дельт рек они связаны с оседанием выносимых с суши твердых частиц. Аномально высокие содержания взвешенной формы железа в придонном горизонте центральной части Среднекаспийской котловины, фиксируемые на отдельных станциях, обусловлены поступлением железа с эманациями донных грязевых вулканов и его коагуляцией в условиях щелочной среды. В целом, с увеличением глубины наблюдается последовательный рост концентраций взвешенной формы железа. Это связано с изменением солености и усилением вертикальной стратификации (уменьшением солености поверхностного горизонта и увеличением солености глубоких слоев). Это приводит к коагу­ляции и флокуляции органических и металлор­ганических коллоидов и переводу растворенного железа во взвесь The article is devoted to the study of the distribution of iron in the water suspension of the Middle Caspian Sea. The relevance of the work is determined by the need to assess the natural state of the marine environment and fix its basic state (including various forms of chemical elements) for further use in order to monitor the environmental situation on the shelf of the Caspian Sea in the conditions of intensification of exploration and development of oil fields. Aim. To establish the characteristic features of the behavior of suspended iron in the waters of the Middle Caspian. Materials and methods. The material selected in 1989-1990 during the voyages of research vessels was studied. owned by the Caspian Research Institute of Fisheries, before the development of oil and gas fields. It is represented by filtered suspended particles from 178 water samples taken from various layers of the water column at 63 stations. Determination of iron content was carried out on the PGS-2 spectrograph by evaporation. Results. The minimum concentrations of the suspended form of iron inthe surface layer of the water column were established on the section of the inner shelf and the underwater slope of the Middle Caspian basin, which is associated with the removal of solid particles by drift currents. The concentrations of the suspended form of iron in the surface layer increase towards the middle of the sea, which is caused by the contraction of suspended particles by the centripetal forces of the cyclonic current. The bottom layer is characterized by increased concentrations of the suspended form of iron. Near river deltas, they are associated with the subsidence of solid particles carried out from the land. Abnormally high concentrations of suspended iron in the bottom horizon of the central part of the Middle Caspian basin, recorded at individual stations, are due to the influx of iron with emanations of bottom mud volcanoes and its coagulation in an alkaline environment. In general, with increasing depth, there is a consistent increase in the concentrations of the suspended form of iron. This is due to a change in salinity and an increase in vertical stratification (a decrease in the salinity of the surface horizon and an increase in the salinity of the deep layers). This leads to coagulation and flocculation of organic and organometallic colloids and the transfer of dissolved iron into suspension.

The water-column chemical signature after the 1998 eruption of Axial Volcano

1999 ◽  
Vol 26 (24) ◽  
pp. 3645-3648 ◽  
Author(s):  
Joseph A. Resing
Keyword(s):  
Water Column ◽  
Chemical Signature ◽  
Axial Volcano
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