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Influence of aerosol vertical profile variability on retrievals of aerosol optical thickness from NOAA AVHRR measurements in the Baltic region

100%

Rozwadowska A.

Oceanologia

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2007

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tom 49

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nr 2

The expected influence of variability in atmospheric aerosol profiles on retrievals of aerosol optical thickness (AOT) from NOAA AVHRR measurements is analysed. In particular, the bias in the AOT retrieval due to the assumption of a climatological aerosol profile in the retrieval algorithm is studied. The bias is defined as the difference between AOT retrieved with an algorithm using a climatological aerosol profile, and the actual AOT employed in the calculations of radiances at the top of the atmosphere (TOA). The TOA radiances are simulated by means of the MODTRAN code for different aerosol profiles. Atmospheric conditions and solar and satellite angles used in the bias simulations are typical of the Baltic region. In the simulations, the maximum absolute value of the bias amounts to nearly 40% in channel 2 and 14% in channel 1 of AVHRR.

2

Significant increase of aerosol number concentrations in air masses crossing a densely trafficked sea area

75%

Kecorius S., Kivekas N., Kristensson A., Tuch T., Covert D. S., Birmili W., Lihavainen H., Hyvarinen A.-P., Martinsson J., Sporre M. K., Swietlicki E., Wiedensohler A., Ulevicius V.

Oceanologia

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2016

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tom 58

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nr 1

3

Chemical composition of surface layer of PM1, PM1-2.5, PM2.5-10

75%

Klejnowski K., Talik E., Pastuszka J., Rogula W., Krasa A.

Archiwum Ochrony Środowiska

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2007

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tom 33

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nr 3

4

A method to investigate the dynamics of the content of metals in the airborne component of mass exchange between sea and atmosphere over the Baltic Sea

63%

Garbalewski C., Berek H., Foldzinska A.

Oceanologia

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1979

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tom 11

5

Ångström coefficient as an indicator of the atmospheric aerosol type for a well-mixed atmospheric boundary layer: Part 1: Model development

63%

Kusmierczyk-Michulec J.

Oceanologia

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2009

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tom 51

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nr 1

5-38

The physical and optical properties of an atmospheric aerosol mixture depend on a number of factors. The relative humidity influences the size of hydroscopic particles and the effective radius of an aerosol mixture. In consequence, values of the aerosol extinction, the aerosol optical thickness and the Ångström coefficient are modified. A similar effect is observed when the aerosol composition changes. A higher content of small aerosol particles causes the effective radius of an aerosol mixture to decrease and the Ångström coefficient to increase. Both effects are analysed in this paper. The parameters of the size distribution and the type of components used to represent natural atmospheric aerosol mixtures are based on experimental data. The main components are sea-salts (SSA), anthropogenic salts (WS, e.g. NH4HSO4, NH4NO3, (NH4)2SO4), organic carbon (OC) and black carbon (BC). The aerosol optical thickness is modelled using the external mixing approach. The influence of relative humidity on the optical and physical properties of the following aerosol mixtures is investigated: (SSA&WS), (SSA&OC), (SSA&BC), (SSA, WS&OC) and (WS, OC&BC). It is demonstrated that the Ångström coefficient can be used as a rough indicator of the aerosol type.

6

Multifrequency lidar inverse problem in atmospheric aerosol studies for simple marigenic aerosol models

63%

Piskozub J.

Oceanologia

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1990

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tom 28

7

Seasonal variability in the optical properties of Baltic aerosols

63%

Zdun A., Rozwadowska A., Kratzer S.

Oceanologia

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2011

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tom 53

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nr 1

8

The influence of the marine aerosol on atmospheric extinction

63%

Kusmierczyk-Michulec J.

Oceanologia

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1994

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tom 36

|

nr 1

Ograniczanie wyników

Influence of aerosol vertical profile variability on retrievals of aerosol optical thickness from NOAA AVHRR measurements in the Baltic region

Significant increase of aerosol number concentrations in air masses crossing a densely trafficked sea area

Chemical composition of surface layer of PM1, PM1-2.5, PM2.5-10

A method to investigate the dynamics of the content of metals in the airborne component of mass exchange between sea and atmosphere over the Baltic Sea

Ångström coefficient as an indicator of the atmospheric aerosol type for a well-mixed atmospheric boundary layer: Part 1: Model development

Multifrequency lidar inverse problem in atmospheric aerosol studies for simple marigenic aerosol models

Seasonal variability in the optical properties of Baltic aerosols

The influence of the marine aerosol on atmospheric extinction