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1

Solar radiation at the Baltic Sea surface

100%
Krezel A.
Oceanologia
|
1985
|
tom 21
2

AVHRR images as a tool in the analysis of marine suspended matter in Polar Region

100%
Krezel A.
Oceanological Studies
|
1997
|
tom 26
|
nr 2-3
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Sea surface temperature retrieval from MSG-SEVIRI data in the Baltic Sea area

63%
Wozniak M., Krezel A.
Oceanologia
|
2010
|
tom 52
|
nr 3
331-344
The aim of the paper was to confirm the proposition that the classical SST algorithms MCSST and NLSST originally prepared for AVHRR data could also be used for Meteosat/SEVIRI data with satisfactory accuracy in the mid-latitude region, where the spatial resolution is about 7×7 km. The research was performed in the southern Baltic Sea (between 13◦E 53◦N and 21◦E 58◦N). Data were collected in all the seasons of 2007. The coefficients were found by means of regression analysis. SSTs determined on the basis of AVHRR data were used in the regression analysis instead of in situ data. A set of paired AVHRR and SEVIRI images spaced no more than 8 minutes apart were compared. The results show that the method is capable of producing sea surface temperatures with a statistical error (standard deviation) of 1◦C.
4

Preliminary data on total radiation in the region of Arctowski Station (King George Island, South Shetland Islands)

63%
Krezel A., Pecherzewski K.
Polish Polar Research
|
1981
|
tom 02
|
nr 3-4
5

Green light penetration depth in Puck Bay

63%
Matciak M., Krezel A.
Oceanologia
|
1991
|
tom 31
6

The inhomogeneity of vertical distributions of suspended matter in the sea - consequences for remote sensing

63%
Bradtke K., Krezel A.
Oceanologia
|
1994
|
tom 36
|
nr 1
7

Chlorophyll a content in the surface layer of the Gulf of Gdansk in the AVHRR images

63%
Krezel A., Latala A.
Oceanological Studies
|
1999
|
tom 28
|
nr 3-4
8

The use of sequential satellite images for the calculating surface velocity vectors in the waters of the Gulf of Gdansk

63%
Zarki I., Krezel A.
Oceanological Studies
|
1999
|
tom 28
|
nr 3-4
9

Some optical properties of surface waters in the north-western Tropical Atlantic

63%
Krezel A., Kamieniecki M.
Oceanologia
|
1992
|
tom 32
10

Coordination chemistry of glutathione

63%
Krezel A., Bal W.
Acta Biochimica Polonica
|
1999
|
tom 46
|
nr 3
The metal ion coordination abilities of reduced and oxidized glutathione are reviewed. Reduced glutathione (GSH) is a very versatile ligand, forming stable complexes with both hard and soft metal ions. Several general binding modes of GSH are described. Soft metal ions coordinate exclusively or primarily through thiol sulfur. Hard ones prefer the amino acid-like moiety of the glutamic acid residue. Several transition metal ions can additionally coordinate to the peptide nitrogen of the γ-Glu-Cys bond. Oxidized glutathione lacks the thiol function. Nevertheless, it proves to be a surprisingly efficient ligand for a range of metal ions, coordinating them primarily through the donors of the glutamic acid residue.
11
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A simple model of light transmission through the atmosphere over the Baltic Sea utilising satellite data

51%
Krezel A., Kozlowski L., Paszkuta M.
Oceanologia
|
2008
|
tom 50
|
nr 2
125-146
A simple spectral model of solar energy input to the sea surface was extended to incorporate space-borne data. The extension involved finding a method of determining aerosol optical thickness (on the basis of AVHRR data) and the influence of cloudiness (on the basis of METEOSAT data) on the solar energy flux. The algorithm for satellite data assimilation involves the analysis of satellite images from the point of view of cloud identification and their classification with respect to light transmission. Solar energy input values measured at the Earth’s surface by traditional methods were used to calibrate and validate the model. Preliminary evaluation of the results indicates a substantial improvement in the accuracy of estimates of solar energy input to the sea surface in relation to models utilising only traditionally obtained data on the state of the atmosphere.
12

Daily radiation budget of the Baltic Sea surface from satellite data

51%
Zapadka T., Krezel A., Paszkuta M., Darecki M.
Polish Maritime Research
|
2015
|
tom 22
|
nr 3
Recently developed system for assessment of radiation budget for the Baltic Sea has been presented and verified. The system utilizes data from various sources: satellite, model and in situ measurements. It has been developed within the SatBałtyk project (Satellite Monitoring of the Baltic Sea Environment - www.satbaltyk.eu) where the energy radiation budget is one of the key element. The SatBałtyk system generates daily maps of the all components of radiation budget on every day basis. We show the scheme of making daily maps, applied algorithms and empirical data collection within the system. An empirical verification of the system has been carried out based on empirical data collected on the oil rig placed on the Baltic Sea. This verification concerned all the components of the surface radiation budget. The average daily NET products are estimated with statistical error ca. 13 Wm-2. The biggest absolute statistical error is for LWd component and equals 14 Wm-2. The relative error in relation to the average annual values for whole Baltic is the biggest for SWu and reaches 25%. All estimated components have correlation coefficient above 0.91
13

Sequence-specific Ni(II)-dependent peptide bond hydrolysis in a peptide containing threonine and histidine residues

51%
Krezel A., Mylonas M., Kopera E., Bal W.
Acta Biochimica Polonica
|
2006
|
tom 53
|
nr 4
14

PDZ domain from Dishevelled - a specificity study

51%
Smietana K., Mateja A., Krezel A., Otlewski J.
Acta Biochimica Polonica
|
2011
|
tom 58
|
nr 2
Intracellular signaling cascades induced by Wnt proteins play a key role in developmental processes and are implicated in cancerogenesis. It is still unclear how the cell determines which of the three possible Wnt response mechanisms should be activated, but the decision process is most likely dependent on Dishevelled proteins. Dishevelled family members interact with many diverse targets, however, molecular mechanisms underlying these binding events have not been comprehensively described so far. Here, we investigated the specificity of the PDZ domain from human Dishevelled-2 using C-terminal phage display, which led us to identification of a leucine-rich binding motif strongly resembling the consensus sequence of a nuclear export signal. PDZ interactions with several peptide and protein motifs (including the nuclear export signal sequence from Dishevelled-2 protein) were investigated in detail using fluorescence spectroscopy, mutational analysis and immunoenzymatic assays. The experiments showed that the PDZ domain can bind the nuclear export signal sequence of the Dishevelled-2 protein. Since the intracellular localization of Dishevelled is governed by nuclear localization and nuclear export signal sequences, it is possible that the intramolecular interaction between PDZ domain and the export signal could modulate the balance between nuclear and cytoplasmic pool of the Dishevelled protein. Such a regulatory mechanism would be of utmost importance for the differential activation of Wnt signaling cascades, leading to selective promotion of the nucleus-dependent Wnt β-catenin pathway at the expense of non-canonical Wnt signaling.
15

Use of satellite data in monitoring of hydrophysical parameters of the Baltic Sea environment

51%
Krezel A., Bradtke K., Herman A.
Polish Maritime Research
|
2015
|
tom 22
|
nr 3
Intensive development of infrastructure for fast processing of outsized amount of space-borne data enables now to use the satellite data for operational controlling the state of its environment. In our presentation we show some examples of analysis of processes in marine environment which are possible due to satellite data and algorithms of its processing developed in SatBaltic Project. It concerns supporting of modelling of solar energy inflow to the sea with space-borne input data, identification and analysis of sea ice cover, supporting of oil spill detection, and identification of phenomena which modify spatial distribution of the sea surface temperature
16
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Longwave radiation budget at the Baltic Sea surface from satellite and atmospheric model data

51%
Zapadka T., Krezel A., Wozniak B.
Oceanologia
|
2008
|
tom 50
|
nr 2
147-166
The net longwave radiation flux LW↑↓ in the Baltic Sea in 2001 has been subjected to spatial and temporal analysis. Maps of the mean monthly LW↑↓ over the Baltic were drawn using the new semi-empirical formula for the Baltic Sea (Zapadka et al. 2007). The input data for the formula, such as sea surface and air temperatures, and cloud cover, were obtained from the Tiros N/NOAA and METEOSAT 7 satellites and from the UMPLfo recast model (see http://meteo.icm.edu.pl). The mean annual LW↑↓ for 2001 was estimated at 63 W m−2 and compared with available data from other sources. The monthly maps of the net flux LW↑↓ over the Baltic show that the total values reach a minimum (LW↑↓≈50 W m−2) in April, September, October and a maximum (LW↑↓≈80 W m−2) in November. The statistical error of daily maps, on which the monthly maps were based, is no more than 18 W m−2.
17
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Development of a satellite method for Baltic ecosystem monitoring (DESAMBEM) - an ongoing project in Poland

51%
Wozniak B., Krezel A., Dera J.
Oceanologia
|
2004
|
tom 46
|
nr 3
A large national project: Development of a satellite method for Baltic ecosystem monitoring (DESAMBEM) for creating mathematical models and a complex algorithm for the remote sensing of the Baltic ecosystem and its primary production is described. The final aim of the project is the development of a routine remote sensing methodology for determining characteristics of the Baltic ecosystem such as distribution maps of surface temperature, water transparency, upwelling currents, phytoplankton blooms, radiation balance, pigment concentrations and primary production. The progress of the study and examples of results are presented.
18
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Sea surface temperature distribution during upwelling along the Polish Baltic coast

51%
Krezel A., Ostrowski M., Szymelfenig M.
Oceanologia
|
2005
|
tom 47
|
nr 4
Among over 150 maps of sea surface temperature in the Polish Baltic coastal region derived from satellite data during the warm period of the year (April–October) in 2000–2002, 41 cases were noted where its distribution showed characteristic features indicating the occurrence of coastal upwelling. The fundamental parameters of range, probability of occurrence and temperature modification caused by water from deeper sea layers raised by an upwelling event and spreading across the surface were established for three regions (Hel, Łeba and Kołobrzeg). The Kołobrzeg upwelling region had the largest spatial range (up to 5000 km2). The region with the smallest spatial range (Hel, up to 1400 km2) had the largest surface temperature amplitude (to 14◦C), the largest maximum temperature gradient (5◦C km−1) and the largest average sea surface temperature decrease in the centre in relation to the background value.
19
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Influence of coastal upwelling on chlorophyll a concentration in the surface water along the Polish coast of the Baltic Sea

51%
Krezel A., Szymanek L., Kozlowski L., Szymelfenig M.
Oceanologia
|
2005
|
tom 47
|
nr 4
Space-time variations in chlorophyll a (Chl a) concentrations in the surface water of upwelling regions along the Polish coast of the Baltic Sea were analysed. Carried out between 1998 and 2002 in the warmer season (from April till October), the measurements were targeted mainly at the Hel upwelling. Satellite-derived sea surface temperature (AVHRR) and Chl a data (SeaWiFS) were used. Generally speaking, the Chl a concentration increased in the upwelling plume, except along the Hel Peninsula, where two scenarios took place: a reduction in Chl a concentration in spring and an increase in autumn.
20
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Toxic Nodularia spumigena blooms in the coastal waters of the Gulf of Gdańsk: a ten-year survey

51%
Mazur-Marzec H., Krezel A., Kobos J., Plinski M.
Oceanologia
|
2006
|
tom 48
|
nr 2
In the Baltic Sea, summer blooms of the filamentous, nitrogen-fixing cyanobacterium Nodularia spumigena are favoured by high P concentrations at low N:P ratios and a salinity range of 5–13 PSU. The blooms are initiated by calm and sunny weather, an elevated surface water temperature and thermal stratification. The mass occurrence of N. spumigena in coastal waters is a matter of special concern, as the cyanobacterium produces nodularin, a potent pentapeptide hepatotoxin. In the Gulf of Gdańsk, the large-scale occurrence of N. spumigena was recorded for the first time in 1994. Blooms of a similar intensity occurred in 2001, 2003 and 2004. Nodularin concentrations in freeze-dried bloom samples varied from 0.01 to 4.01 mg g−1 d.w. In the coastal waters of the Gulf of Gdańsk, cell-bound nodularin concentrations in 2004 and 2005 attained maxima of 25 852±107 μg dm−3 and 3964±125 μg dm−3, respectively. Microscopic analysis revealed the presence of diverse Nodularia forms, with the dominance of curved filaments in bloom samples. The results of in situ studies and remote sensing measurements indicate a high frequency and intensity of cyanobacterial blooms in the Gulf of Gdańsk in the last ten years.
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