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Wyszukujesz frazę "dissolved organic matter" wg kryterium: Temat


Tytuł:
Benthic diffusive fluxes of organic and inorganic carbon, ammonium and phosphates from deep water sediments of the Baltic Sea
Autorzy:
Lengier, M.
Szymczycha, B.
Brodecka-Goluch, A.
Klostowska, Z.
Kulinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2078878.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
biogeochemistry
benthic flux
organic carbon
organic matter
remineralization
dissolved organic carbon
dissolved inorganic carbon
ammonium
phosphate
oxygen availability
deep water sediment
Baltic Sea
Opis:
In this study, Baltic Sea sediments, as a source of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), ammonium (NH4 +), and phosphates (PO4 3−), were investigated based on samples obtained in 2017 and 2018, shortly after a sequence of inflows from the North Sea that occurred between 2014 and 2017. Two different data sets (I and II) were used to assess benthic diffusive fluxes and thus elucidate both the temporal conditions at the time of sampling (data set I) and the diffusion potential of the sediments (data set II). The estimated fluxes were characterized by a high spatial variability within the whole Baltic Sea and ranged between −0.01 and 3.33 mmol m−2 d−1 for DIC, −0.02 and 0.44 mmol m−2 d−1 for DOC, −40.5 and 1370.1 μmol m−2 d−1 for NH4 +, and −5.9 and 60.9 μmol m−2 d−1 for PO4 3−. The estimated benthic diffusive fluxes indicated a high potential for DIC, DOC, NH4 +, and PO4 3− release from Baltic Sea sediments. The high O2 concentrations in the water column of the Gulf of Bothnia together with major Baltic inflows (MBIs) bringing oxygenated seawater to the Baltic Proper and to some extent the Eastern Gotland Basin regulate the amounts of chemicals released from the sediment. Our study showed that a sequence of inflows has greater impact on the diminution of diffusive fluxes than does a single MBI and that the sediments of the Baltic Proper, even under the influence of inflows, are an important source of C, N, and P (159 kt yr−1 for DIC+DOC, 6.3
Źródło:
Oceanologia; 2021, 63, 3; 370-384
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of non-water absorption coefficient partitioning algorithms in optically complex coastal waters of Kochi and Goa, India
Autorzy:
Kolluru, S.
Gedam, S.S.
Inamdar, A.B.
Powiązania:
https://bibliotekanauki.pl/articles/2078824.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
absorption coefficient
phytoplankton
coloured dissolved organic matter
partitioning
algorithm
coastal water
particulate matter
optical property
India
Opis:
Absorption coefficient partitioning algorithms (APAs) were developed to partition the total absorption coefficient (a(λ)) or total non-water absorption coefficient (anw (λ)) into the absorption subcomponents, i.e., absorption due to phytoplankton aph(λ), colored dissolved organic matter (CDOM) ag(λ) and non-algal particulate matter ad (λ), λ is the wavelength. Absorption coefficients of CDOM and non-algal particulate matter are generally combined due to a similarity in exhibited spectral shape and represented as colored detrital matter (CDM) absorption coefficient, adg(λ). This study focuses on the applicability of five APAs Schofield’s, Lin’s, Zhang’s, Stacked Constraints Model (SCM) and Generalized Stacked Constraints Model (GSCM), in deriving the absorption subcomponents from anw (λ) in optically complex coastal waters of Kochi and Goa, India. The average spectral Mean Absolute Percentage Errors (MAPE) obtained for all models in the retrieval of aph(λ), ad (λ), ag(λ) and adg(λ) lie in the ranges of 26—44%, 37—45%, 34—65% and 42—56%. Slopes of adg(λ), ag(λ) and ad (λ) as indicated by Sdg, Sg and Sd are derivable from GSCM, Schofield and Lin’s models only. GSCM model exhibited good retrieval capability of Sd with MAPE values of 22% and a correlation coefficient of 0.74. In retrieval of Sg parameter, none of the models demonstrated satisfactory performance. Overall, the GSCM and Schofield’s models demonstrated good performance in the retrieval of absorption subcomponents, aph(λ), adg(λ), ad (λ) and Sd. Effect of applying baseline correction to ad (λ) on model performance is studied. Tuning with in situ data can further improve the absorption subcomponent and slope parameter retrieval capability of the models.
Źródło:
Oceanologia; 2021, 63, 4; 420-437
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors regulating the compositions and distributions of dissolved organic matter in the estuaries of Jiaozhou Bay in North China
Autorzy:
Hu, J.
Zou, L.
Wang, J.
Ren, Q.
Xia, B.
Yu, G.
Powiązania:
https://bibliotekanauki.pl/articles/48070.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
organic matter
chromophoric dissolved organic matter
dissolved organic matter
particulate organic matter
total carbohydrate
amino acid
biogeochemical process
coastal environment
chlorophyll a
North China
Źródło:
Oceanologia; 2020, 62, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of light transfer through drift ice and landfast ice in the Northern Baltic Sea
Autorzy:
Kari, E.
Jutila, A.
Friedrichs, A.
Lepparanta, M.
Kratzer, S.
Powiązania:
https://bibliotekanauki.pl/articles/2079188.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
light transfer
measurement
sea ice
landfast ice
coloured dissolved organic matter
Baltic Sea
Opis:
The aim of this study was to investigate the light transfer through sea ice with a focus on bio-optical substances both in fast ice and in the drift ice zones in the northern Baltic Sea. The measurements included snow and ice structure, spectral irradiance and photosynthetically active radiation below the sea ice. We also measured the concentrations of the three main bio-optical substances which are chlorophyll-a, suspended particulate matter, and coloured dissolved organic matter (CDOM). These bio-optical substances were determined for melted ice samples and for the underlying sea water. The present study provides the first spectral light transfer data set for drift ice in the Baltic Sea. We found high CDOM absorption values typical to the Baltic Sea waters also within sea ice. Our results showed that the transmittance through bare ice was lower for the coastal fast ice than for the drift ice sites. Bio-optical substances, in particular CDOM, modified the spectral distribution of light penetrating through the ice cover. Differences in crystal structure and the amount of gas inclusions in the ice caused variation in the light transfer. Snow cover on ice was found to be the dominant factor influencing the light field under ice, confirming previous studies. In conclusion, snow cover dominated the amount of light under the ice, but did not modify its spectral composition. CDOM in the ice absorbs strongly in the short wavelengths. As pure water absorbs most in the long wavelengths, the light transfer through ice was highest in the green (549–585 nm).
Źródło:
Oceanologia; 2020, 62, 3; 347-363
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface desalinated layer distribution in the Kara Sea determined by shipboard and satellite data
Autorzy:
Glukhovets, D.L.
Goldin, Y.A.
Powiązania:
https://bibliotekanauki.pl/articles/2079196.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
surface layer
desalination
satellite data
coloured dissolved organic matter
interannual variability
Kara Sea
Opis:
This study reports the propagation dynamics of the Kara Sea surface desalinated layer (SDL) during the summer and autumn seasons. We analysed shipboard measurements data collected in 2013–2018 and MODIS ocean colour data that correlated with the shipboard ones. We formulated a comparatively strict criterion to determine the SDL border based on satellite data. For that, we analyzed the shipboard flow-through measuring system data obtained while crossing the surface desalinated layer border. Further, we used a regional algorithm to process the satellite data and estimate the coloured dissolved organic matter absorption coefficient for the Kara Sea. The results demonstrate a significant effect of the wind regime on the interseasonal and interannual variability of the transformation of the SDL boundaries. The positions of the surface desalinated layer boundaries at different times during 2013–2018 are given. The obtained results are important for calculating the heat balance and analyzing the Kara Sea bio-productivity.
Źródło:
Oceanologia; 2020, 62, 3; 364-373
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Characteristics of Organic Compounds in Landfill Leachate Biologically Treated under Different Technological Conditions
Autorzy:
Koc-Jurczyk, Justyna
Jurczyk, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/123806.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
landfill leachate
hybrid SBR
dissolved organic matter
organic fraction
Opis:
In this work, the semi-synthetic wastewater made of the leachate derived from non-hazardous municipal waste landfill in Kozodrza (south-eastern Poland) and supplemented by ammonium, was treated in hybrid SBRs to assess the removal efficiency of organic compounds, including humic substances and dissolved fractions, depending on the technological conditions. The technological layout variants concerned both the volumetric proportions of aerated and anoxic zones (0.33 and 0.66) as well as the N/C ratio (0.1 and 0.2). It was found that the efficiency of organic compounds removal (expressed as COD, BOD5 and TOC) was influenced by the geometry of oxygen supply; in the SBRs operating with 0.33 ratio, it was significantly higher compared to that with 0.75 ratio. The analysis also revealed that the N/C ratio set at 0.1 resulted in higher treatment efficiency than that obtained for 0.2. The composition of dissolved organic fractions in outflows was also related both with the SBRs geometry and the N/C ratio. It was found that proportions of TOC and humic substances were significantly lower in the SBRs operating with aeration geometry of 0.33, compared to the ones working with 0.66. Moreover, the N/C ratio of 0.1 led to a higher content of dissolved humic substances and COD in outflows.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 104-111
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content and changes in dissolved organic matter in meadow and arable soils over time
Autorzy:
Rosa, E.
Debska, B.
Pakula, J.
Tobiasova, E.
Powiązania:
https://bibliotekanauki.pl/articles/971316.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
meadow and arable soils
toc
tnt
dissolved organic matter
Opis:
Considering the discrepancies in the reports on seasonal changes in the content of dissolved organic carbon, this paper concerns the research which aimed at defining the content and seasonal changes in dissolved organic matter (DOM) in arable and meadow soils in moderate climate conditions. The research has involved the soils sampled in the kujawsko-pomorskie province (Poland). Gleic Phaeozems (meadow soils), Brunic Arenosols and Eutric Cambisols were sampled from the depth of 0-30 cm, 30-60 cm and 60-100 cm, November 2011 through September 2013. The soil samples were analyzed for dry weight content, pH, content of total organic carbon and total nitrogen. DOM was extracted with 0.004 mol·dm⁻³ CaCl₂, in the extracts the content of dissolved organic carbon (DOC) and dissolved nitrogen (DNt) were assayed. The share of DOC was determined by the soil management. The analysis of variance did not show significant differences in the content of TOC and Nt across the soil sampling dates. Were recorded changes in DOC and DNt between successive sampling dates; for topsoil for DOC – from -12.06% to 13.34% (meadow soils) and for DNt -40.84% to 47.44% (arable soils).
Źródło:
Polish Journal of Soil Science; 2019, 52, 2; 183-194
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal changes in particulate organic matter (POM) concentrations and properties measured from deep areas of the Baltic Sea
Autorzy:
Winogradow, A.
Mackiewicz, A.
Pempkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/47588.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
particulate organic matter
seasonal change
particulate organic carbon
chlorophyll a
heterotrophic bacteria
zooplankton
dissolved organic compound
nutrient
deep water
Baltic Sea
Źródło:
Oceanologia; 2019, 61, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin chlorophyll layer concomitant of the thermohaline intrusion in the confluence of the Gulf Stream and Labrador Current (a case study)
Autorzy:
Karabashev, G.S.
Powiązania:
https://bibliotekanauki.pl/articles/48303.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
fluorometer
chlorophyll fluorescence
sea water
temperature
coloured dissolved organic matter
vertical distribution
thermohaline
sea water intrusion
Labrador Current
Źródło:
Oceanologia; 2019, 61, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio-optical trends of seas around Turkey: An assessment of the spatial and temporal variability
Autorzy:
Bengil, F.
Mavruk, S.
Powiązania:
https://bibliotekanauki.pl/articles/48746.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chlorophyll a
coloured dissolved organic matter
optical property
backscattering coefficient
marine ecosystem
spatial variability
temporal variability
bio-optical property
Aegean Sea
Marmara Sea
Black Sea
Turkey
Źródło:
Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Narrowband shortwave minima of multispectral reflectance as indication of algal blooms associated with the mesoscale variability in the Brazil-Malvinas Confluence
Autorzy:
Karabashev, G.S.
Evdoshenko, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/48026.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
algal bloom
pigment
reflectance
confluence zone
Brazil-Malvinas confluence
coloured dissolved organic matter
MODIS satellite image
Źródło:
Oceanologia; 2018, 60, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal
Autorzy:
Das, S.
Das, I.
Giri, S.
Chanda, A.
Maity, S.
Lotliker, A.A.
Kumar, T.S.
Akhand, A.
Hazra, S.
Powiązania:
https://bibliotekanauki.pl/articles/48552.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chromophoric dissolved organic matter
absorption coefficient
sea surface
salinity
chlorophyll a
total suspended matter
spatio-temporal variability
Bengal Bay
continental shelf
Opis:
The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of bacterial production in the water column between two Arctic fjords, Hornsund and Kongsfjorden (West Spitsbergen)
Autorzy:
Ameryk, A.
Jankowska, K.M.
Kalinowska, A.
Weslawski, J.M.
Powiązania:
https://bibliotekanauki.pl/articles/47914.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
bacterial production
environmental factor
water column
chlorophyll a
water temperature
bacterial biomass
dissolved organic carbon
dissolved organic matter
Arctic fjord
Spitsbergen
Kongsfjorden
Hornsund
Opis:
Bacterial production and the accompanying environmental factors were measured in the water columns of two Arctic fjords during the cruise in July and August 2013. Water samples were collected at six stations located in the central part of Hornsund and Kongsfjorden. In Hornsund, where average water temperatures were 1.25-fold lower than in Kongsfjorden, the bacterial production was twice as high (0.116 ± 0.102 vs 0.05 ± 0.03 mg C m−3 h−1). Statistical analysis indicated that chlorophyll a concentration itself was not a significant factor that affected bacterial production, in contrast to its decomposition product, pheophytin, originating from senescent algal cells or herbivorous activity of zooplankton. Single and multiple regression analysis revealed that water temperature, dissolved organic carbon (DOC), and pheophytin concentration were the main factors affecting bacterial production in both fjords.
Źródło:
Oceanologia; 2017, 59, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diurnal and seasonal DOC and POC variability in the land-locked sea
Autorzy:
Szymczycha, B.
Winogradow, A.
Kulinski, K.
Koziorowska, K.
Pempkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/48956.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
marine environment
organic matter
seasonal change
diurnal change
particulate organic carbon
dissolved organic carbon
chlorophyll a
salinity
pH
temperature
Baltic Sea
Opis:
Organic matter is a minor yet important component of the marine environment. The aim of this study was to investigate the diurnal and seasonal changes in dissolved and particulate organic carbon (DOC and POC, respectively). Thus, DOC and POC as well as chlorophyll a (Chl a), δ13C, NO3−, NO2−, NH4+, PO43−, salinity, pH, and temperature were regularly measured in samples collected for 24 h (2-h resolution) in the Gdańsk Deep (54°44.730′N, 19°08.531′E) at three water depths (1, 10, and 40 m) during sampling campaigns in 2011 (May), 2014 (May), and 2015 (January, March, May, July, September, November). Seasonal variations in DOC and POC followed the seasonality of Chl a (proportional trend) and nutrients (reverse trend) concentrations. Diurnal oscillations were detected in six out of the eight measurement series. The strongest diurnal variability in both POC and DOC occurred in May 2011 and March 2015, when phytoplankton activity was highest (high Chl a). The surprisingly low δ13C values (range: −28‰ to −24‰) measured over the course of the study revealed the gaps in our knowledge of the isotopic characteristics of terrestrial- vs. marine-derived particulate organic matter.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpuszczona materia organiczna w wodach słodkich
Dissolved organic matter in freshwaters
Autorzy:
Puczko, Katarzyna
Zieliński, Piotr
Jekatierynczuk-Rudczyk, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1034088.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Tematy:
dissolved organic carbon
dissolved organic matter
freshwater ecosystems
ekosystemy słodkowodne
rozpuszczona materia organiczna
rozpuszczony węgiel organiczny
Opis:
Związki organiczne stanowią powszechny składnik wód słodkich. Rozpuszczona materia organiczna (RMO) w środowisku lądowym jest syntetyzowana zarówno wewnątrz ekosystemu jak i poza nim. RMO jest heterogeniczną mieszaniną tysięcy różnych organicznych substancji i związków chemicznych zawierających, oprócz węgla, także m. in. tlen, wodór, azot, fosfor i siarkę. RMO podlega biologicznym i abiotycznym transformacjom. Na przemiany RMO w przyrodzie składają się procesy produkcji, fotoutleniania, wymywania, ługowania oraz akumulacji. RMO wpływa na tempo i zasięg przemieszczania się metali ciężkich w wodach słodkich. Rozpuszczone barwne substancje organiczne powodują szybsze ogrzewanie się wody. Rozpuszczony węgiel organiczny (RWO) stanowi największy rezerwuar węgla organicznego w ekosystemach wodnych i jest istotnym elementem biogeochemicznego obiegu węgla w przyrodzie. Wysokie stężenie RMO w wodach słodkich prowadzi do znacznych deficytów tlenowych w hypolimnionie i eutrofizację wód. Obfitość i jakość RMO wpływa również na tempo produkcji pierwotnej i stanowi ważny element pętli mikrobiologicznej organizmów wodnych.
Organic compounds are a common component of freshwaters. Dissolved organic matter (DOM) is synthesized inside the ecosystem and beyond, in the terrestrial environment. DOM is a heterogeneous mixture of thousands of different organic substances and chemical compounds containing, in addition to carbon, also: oxygen, hydrogen, nitrogen, phosphorus and sulfur. DOM undergoes biological and abiotic transformations. The transformation of DOM consists of primary production processes, photo-oxidation processes, leaching and accumulation. DOM affects the rate and movement of heavy metals in freshwaters. Colored organic substances cause higher water temperature. Dissolved organic carbon (DOC) is the largest reservoir of organic carbon in aquatic ecosystems and is an important element of the biogeochemical carbon cycle. Elevated concentration of DOM in surface water, affects the oxygen deficits in hypolimnion and water eutrophication. The abundance and quality of DOM affects the rate of primary production and is an important element of the microbial loop.
Źródło:
Kosmos; 2017, 66, 3; 457-464
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł

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