Wyniki wyszukiwania

1

The application of probability density function in modeling of wind speed on the Polish Baltic Coast

100%

Czernecki B.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2014

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tom 02

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nr 2

The aim of the research was to identify the potential for the use of probability density functions (PDF) in modeling of near-surface wind speed. The approaches of Empirical Orthogonal Functions (EOF) and Canonical Correlation Analysis (CCA) are used in combination with 2-parametric Weibull distribution. The downscaling model was built using a diagnosed relationship between sea level pressure (SLP) patterns over Europe and the Northern Atlantic and estimated monthly values of Weibull parameters at 9 stations along the Polish Baltic Coast. The obtained scale (A) and shape (k) parameters make it possible to describe temporal variations of wind fields and their theoretical probability values. This may have further application in the modeling of extreme wind speeds for seasonal forecasting, climate prediction or in historical reconstructions. The model evaluation was done separately for the calibration (1971-2000) and validation periods (2001-2010). The scale parameter was reconstructed reasonably, while there were some problematic issues with the shape parameter, especially in the validation period. The quality of the developed models is generally higher for the winter season, due to larger SLP gradients, whereas the results for the spring and summer seasons were less satisfactory. Despite this, the 99th percentile of theoretical wind speeds are in most cases satisfactory, due to the lesser importance of the shape parameter for typical distributions in the analyzed region.

2

Statistical downscaling of probability density function of daily precipitation on the Polish coast

100%

Wojcik R., Pilarski M., Mietus M.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2014

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tom 02

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nr 1

The aim of this study was to recognize the possibility of downscaling probability density function (PDF) of daily precipitation by means of canonical correlation analysis (CCA). Sea level pressure (SLP) over Europe and the North Atlantic was used as a predictor. A skilful statistical model could be used to generate projections of future changes of precipitation PDF driven by GCM (General Circulation Model) simulations. Daily precipitation totals from 8 stations located on the Polish coast of the Baltic Sea covering the period 1961-2010 were used to estimate the gamma distribution parameters, and only wet days (i.e. ≥0.1mm) were taken in the analysis. The results of the Kolmogorov-Smirnov test and comparison of empirical and theoretical (gamma-distributed) quantiles proved that gamma distribution gives a reliable description of daily precipitation totals. The validation of CCA models applied to gamma parameters revealed that the reliable reconstruction of precipitation PDF is possible only for average long-term conditions. In the case of individual months/seasons the agreement between empirical and reconstructed quantiles is poor. This study shows the potential of modelling of precipitation PDF, however efforts should be made to improve model performance by establishing more reliable links between regional forcing and the variability of the gamma parameters.

3

Marine debris and threats to the Polish coast in 2001 - sources and types

100%

Jozwiak T.

Oceanological and Hydrobiological Studies

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2003

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tom 32

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nr 3

4

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Morpholithodynamical changes of the beach and the nearshore zone under the impact of submerged breakwaters — a case study (Orłowo Cliff, the Southern Baltic)

86%

Kubowicz-Grajewska A.

Oceanologia

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2015

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tom 57

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nr 2

5

Some characteristic wave energy dissipation patterns along the Polish coast

86%

Rozynski G., Szmytkiewicz P.

Oceanologia

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2018

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tom 60

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nr 4

6

Distribution of Marenzelleria cf. viridis [Polychaeta: Spionidae] along the Polish coast of the Baltic Sea

86%

Warzocha J., Gromisz S., Wozniczka A., Koper M.

Oceanological and Hydrobiological Studies

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2005

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tom 34

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nr Suppl.1

7

The sandy bottom fauna of the Pomeranian coast [Southern Baltic] in the second half of the 1970s

86%

Maslowski J.

Acta Scientiarum Polonorum. Piscaria

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2006

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tom 05

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nr 2

8

Influence of coastal upwelling on chlorophyll a concentration in the surface water along the Polish coast of the Baltic Sea

86%

Krezel A., Szymanek L., Kozlowski L., Szymelfenig M.

Oceanologia

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2005

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tom 47

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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.

9

The distribution of water vegetation on the Polish coast of the Baltic Sea in 1996-2000

86%

Plinski M., Jozwiak T.

Oceanological and Hydrobiological Studies

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2004

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tom 33

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nr 2

10

Dynamic features of successive upwelling events in the Baltic Sea - a numerical case study

72%

Myrberg K., Andrejev O., Lehmann A.

Oceanologia

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2010

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tom 52

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nr 1

77-99

Coastal upwelling often reveals itself during the thermal stratification season as an abrupt sea surface temperature (SST) drop. Its intensity depends not only on the magnitude of an upwelling-favourable wind impulse but also on the temperature stratification of the water column during the initial stage of the event. When a ‘chain’ of upwelling events is taking place, one event may play a part in forming the initial stratification for the next one; consequently, SST may drop significantly even with a reduced wind impulse. Two upwelling events were simulated on the Polish coast in August 1996 using a three-dimensional, baroclinic prognostic model. The model results proved to be in good agreement with in situ observations and satellite data. Comparison of the simulated upwelling events show that the first one required a wind impulse of 28 000 kg m−1 s−1 to reach its mature, full form, whereas an impulse of only 7500 kg m−1 s−1 was sufficient to bring about a significant drop in SST at the end of the second event. In practical applications like operational modelling, the initial stratification conditions prior to an upwelling event should be described with care in order to be able to simulate the coming event with very good accuracy.

11

Long-term total solar radiation variability at the Polish Baltic coast in Kolobrzeg within the period 1964-2013

72%

Kleniewska M., Chojnicki B. H., Acosta M.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2016

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tom 04

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nr 2

This study is based on a 50-year data series (1964-2013) of total solar radiation (G) from the Kołobrzeg – station that is located on the Polish Baltic Sea coast and is characterised by a very high level of air quality. To find and remove gross errors, quality control checking procedures were applied in this study. Additionally, the homogeneity of the G series in this study has been tested on a monthly basis by using of the Standard Normal Homogeneity Test for single shifts. We found a statistically non-significant decrease in G during the period from 1964 to 2013. The decrease in the 5-year mean total solar radiation is evident from the beginning of the 1980s, with the minimum mean value occurring in the second half of the 1990s, while G slightly increased from the early 2000s. The analysis of seasonal G patterns shows that total solar radiation in summer is the most similar to the annual pattern and only the summer series trend shows a statistically significant decrease in G. We have also found two noticeable tendencies in monthly anomalies of G over the studied decades; they are negative trends in May and August. The shape of the decadal daily G histogram remained unchanged during the analysed decades.

12

Distal washover fans on Swina Gate Sandbar

72%

Labuz T. L.

Oceanological and Hydrobiological Studies

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2009

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tom 38

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nr Suppl.1

79-95

58%

Wisniewski B., Wolski T.

Oceanologia

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2011

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tom 53

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nr (1-TI)

Extreme sea levels – storm-generated surges and falls – on the Polish coast are usually the effects of three components: the volume of water in the southern Baltic (the initial level preceding a given extreme situation), the action of tangential wind stresses in the area (wind directions: whether shore- or seaward; wind velocities; and wind action duration), and the sea surface deformation produced by deep, mesoscale baric lows moving rapidly over the southern and central Baltic that generate the so-called baric wave. Among these factors, the baric wave is particularly important for, i.e. the water cushion underneath the baric depression, moving along the actual atmospheric pressure system over the sea surface.

19

Climatic and oceanographic conditions in the Southern Baltic Area under an increasing CO2 concentration

58%

Mietus M.

Geographia Polonica

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2000

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tom 73

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nr 2

20

Analysis and forecast of long-term sea level changes along the Polish Baltic Sea coast. Part I. Annual sea level maxima

58%

Wroblewski A.

Oceanologia

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1992

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tom 33

Ograniczanie wyników

The application of probability density function in modeling of wind speed on the Polish Baltic Coast

Statistical downscaling of probability density function of daily precipitation on the Polish coast

Marine debris and threats to the Polish coast in 2001 - sources and types

Morpholithodynamical changes of the beach and the nearshore zone under the impact of submerged breakwaters — a case study (Orłowo Cliff, the Southern Baltic)

Some characteristic wave energy dissipation patterns along the Polish coast

Distribution of Marenzelleria cf. viridis [Polychaeta: Spionidae] along the Polish coast of the Baltic Sea

The sandy bottom fauna of the Pomeranian coast [Southern Baltic] in the second half of the 1970s

Influence of coastal upwelling on chlorophyll a concentration in the surface water along the Polish coast of the Baltic Sea

The distribution of water vegetation on the Polish coast of the Baltic Sea in 1996-2000

Dynamic features of successive upwelling events in the Baltic Sea - a numerical case study

Long-term total solar radiation variability at the Polish Baltic coast in Kolobrzeg within the period 1964-2013

Distal washover fans on Swina Gate Sandbar

Sea level and storm surge forecasting in the Southern Baltic

Dynamics of the Polish coast east of Ustka

Microbial enzymatic activity and its relation to organic matter abundance on sheltered and exposed beaches on the Polish coast

Heteroplasmy of the length of mitochondrial DNA and variation in the population of Mytilus trossulus (Bivalvia: Mytilidae) from the Polish coast

Short-term changes in specific conductivity in Polish coastal lakes (Baltic Sea basin)

Physical aspects of extreme storm surges and falls on the Polish coast

Climatic and oceanographic conditions in the Southern Baltic Area under an increasing CO2 concentration

Analysis and forecast of long-term sea level changes along the Polish Baltic Sea coast. Part I. Annual sea level maxima