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Wyświetlanie 1-15 z 38
Tytuł:
Spectrophotometric studies of marine surfactants in the Southern Baltic Sea
Autorzy:
Drozdowska, V.
Jozefowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/48361.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
surfactant
chromophoric dissolved organic matter
fluorophoric dissolved organic matter
photometry
fluorometry
spectrophotometry
Southern Baltic Sea
riverine water
Źródło:
Oceanologia; 2015, 57, 2
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:
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:
The impact of acidic organic matter on the diversity of underwater vegetation in soft water lakes
Autorzy:
Bociag, K
Powiązania:
https://bibliotekanauki.pl/articles/56617.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
lake
organic matter
soft water lake
acidic organic matter
humic substance
diversity
underwater vegetation
dissolved organic matter
Opis:
This paper addresses underwater vegetation in soft water lakes which are influenced by the anthropogenic input of allochtonic dissolved organic matter (DOM) from drained bogs. The aim of this work is to test the hypothesis regarding the role of DOM in shaping the diversity of underwater vegetation. Large differences in underwater vegetation habitats, the limitation of their occurrence to increasingly shallower littoral (the depth of the lower limit of their occurrence decreased from 12 m up to 1 m) and the regression of underwater vegetation were observed in lake types ranging from oligohumic (median (Me) of DOC in water = 2.5 mg C dm-3) to polyhumic (Me of DOC = 35.6 mg C dm-3). The gradual simplification of internal plant patch structure occurred and the Shannon-Weaver diversity index decreased (Me 0.04 → 0.00). Fewer species were observed in the lakes (Me 9 → 2), and the underwater vegetation covered increasingly smaller areas. Species replacement did not occur and no invasive species appeared.
Źródło:
Acta Societatis Botanicorum Poloniae; 2003, 72, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in DOC, DON content and DOC/DON ratio of acidic arenosol during two growing periods in pot experiments
Autorzy:
Filep, T.
Powiązania:
https://bibliotekanauki.pl/articles/9302734.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
dissolved organic matter
dissolved organic carbon content
dissolved organic nitrogen content
acidic arenosol
growing period
pot experiment
soil
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura; 2004, 59, 4; 2079-2085
0365-1118
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura
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
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:
Fluorescence measured in situ as a proxy of CDOM absorption and DOC concentration in the Baltic Sea
Autorzy:
Kowalczuk, P.
Zablocka, M.
Sagan, S.
Kulinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/48318.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
measurement
optical property
dissolved organic carbon
concentration
dissolved organic matter
fluorescence
global climate model
validation
Źródło:
Oceanologia; 2010, 52, 3; 431-471
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The significance of dissolved organic matter photodegradation as a source of ammonium in natural waters
Autorzy:
Grzybowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/48169.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
natural water
organic matter
significance
irradiation
ammonium
photodegradation
river water
sea water
pond water
dissolved organic matter
Opis:
Samples of sea, river and pond water of different absorbance were exposed to artificial radiation resembling sunlight in the UV range. A statistically significant increase in ammonium concentration was detected in pond water of the highest absorbance after 5 h of irradiation. In sea and river water a corresponding increase (< 0.5 μM) was recorded after an exposure time of 25 hours. The bulk characteristics of the analysed samples were insufficient to explain the observed differences.
Źródło:
Oceanologia; 2002, 44, 3
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:
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:
Validation of empirical and semi-analytical remote sensing algorithms for estimating absorption by Coloured Dissolved Organic Matter in the Baltic Sea from SeaWiFS and MODIS imagery
Autorzy:
Kowalczuk, P.
Darecki, M.
Zablocka, M.
Gorecka, I.
Powiązania:
https://bibliotekanauki.pl/articles/47876.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
validation
remote sensing
Ocean colour
satellite validation
coloured dissolved organic matter
organic matter
absorption
Baltic Sea
Gdansk Gulf
Vistula River
Opis:
An extensive bio-optical data set obtained from field measurements was used to evaluate the performance of an empirical (Kowalczuk et al. 2005) and two semi- analytical algorithms: Carder et al. (1999) and GSM01 (Maritorena et al. 2002) for estimating CDOM absorption in the Baltic Sea. The data set includes coincident measurements of radiometric quantities and absorption coefficients of CDOM made during 43 cruises between 2000 and 2008. In the first stage of the analysis, the accuracy of the empirical algorithm by Kowalczuk et al. (2005) was assessed using in situ measurements of remote sensing reflectance. Validation results improved when matching points located in Gulf of Gdańsk close to the Vistula River mouth were eliminated from the data set. The calculated errors in the estimation of aCDOM(400) in the first phase of the analysis were Bias = −0.02, RMSE = 0.46 and R2 = 0.70. In the second stage, the empirical algorithm was tested on satellite data from SeaWiFS and MODIS imagery. The satellite data were corrected atmospherically with the MUMM algorithm designed for turbid coastal and inland waters and implemented in the SeaDAS software. The results of the best case scenario for estimating the CDOM absorption coefficient aCDOM(400), based on SeaWiFS data, were Bias = −0.02, RMSE = 0.23 and R2 = 0.40. The validation of the Kowalczuk et al. (2005) empirical algorithm applied to MODIS data led to a less accurate estimate of aCDOM(400): Bias = −0.03, RMSE = 0.19 and R2 = 0.29. This assessment of the accuracy of standard semi-analytical algorithms available in the SeaWiFS and MODIS imagery processing software revealed that both algorithms (GSM 01 and Carder) underestimate CDOM absorption in the Baltic Sea with mean systematic and random errors in excess of 70%. The paper presents examples of the application of the Kowalczuk et al. (2005) empirical algorithm for producing maps of the seasonal distribution of aCDOM(400) in the Baltic Sea between 2004 and 2008.
Źródło:
Oceanologia; 2010, 52, 2; 171-196
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:
Two models for absorption by coloured dissolved organic matter (CDOM)
Autorzy:
Schwarz, J.N.
Kowalczuk, P.
Kaczmarek, S.
Cota, G.F.
Mitchell, B.G.
Kahru, M.
Chavez, F.P.
Cunningham, A.
McKee, D.
Gege, P.
Kishino, M.
Phinney, D.A.
Raine, R.
Powiązania:
https://bibliotekanauki.pl/articles/47774.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
ocean colour
coloured dissolved organic matter
surface water
coastal water
spectrophotometric measurement
ultraviolet absorption
absorption
Vistula River
Opis:
The standard exponential model for CDOM absorption has been applied to data from diverse waters. Absorption at 440 nm (ag440) ranged between close to zero and 10 m−1, and the slope oft he semilogarithmic absorption spectrum over a minimum range of400 to 440 nm (s440) ranged between <0.01 and 0.04 nm−1. No relationship was found between ag440 or s440 and salinity. Except in the southern Baltic, s440 was found to have a broad distribution (0.0165 ± 0.0035), suggesting that it should be introduced as an additional variable in bio-optical models when ag440 is large. An alternative model for CDOM absorption was applied to available high quality UV-visible absorption spectra from the WisGla river (Poland). This model assumes that the CDOM absorption spectrum comprises distinct Gaussian absorption bands in the UV, similar to those ofb enzene. Five bands were fit to the data. The mean central energy ofal l bands was higher in early summer (E ∼7.2, 6.6, 6.4, 6.2 and 5.5 eV or 172, 188, 194, 200 and 226 nm) than in winter. The higher energy bands were found to decay in both height and width with increasing salinity, while lower energy bands broadened with increasing salinity. s440 was found to be correlated with shape parameters of the bands centred at 6.4 and 5.5 eV. While the exponential model is convenient for optical modelling and remote sensing applications, these results suggest that the Gaussian model offers a deeper understanding ofc hemical interactions affecting CDOM molecular structure.
Źródło:
Oceanologia; 2002, 44, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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