Z. Litynska

Instytut Meteorologii i Gospodarki Wodnej, Warszawa, Masovian Voivodeship, Poland

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Publications (31)78.03 Total impact

  • 01/2010;
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    ABSTRACT: The work aimed at creating the monthly mean UV climatology for different action spectra for Poland using a UV reconstruction model was performed. The UV reconstruction model was elaborated in Poland, in the frame of COST Action 726 “Long term changes and climatology of UV radiation over Europe.” UV calculations were performed for the period of 1985–2001 on the base of daily global solar radiation and ancillary data. Two biological effective action spectra, Erythemal and Previtamin D, were then applied in order to analyze the UV impact on human beings and the environment. Monthly mean UVBE maps where created using two different specialization methods, which allowed for regional and temporal analysis of UVBE distribution over Poland.
    International Radiation Symposium (IRC∕IAMAS), 3–8 August 2008, Foz do Iguaçu (Brazil); 03/2009
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    A. Jaczewski, Z. Litynska, B. Kois
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    ABSTRACT: The ENVISAT was launched in 2002 Three of its instruments offer the scientific community unique opportunities for atmospheric research The radiosoundings as part of the daily worldwide routine measurements are reliable source of data for the validation of atmospheric profiles Radiosonde data from three Polish upper-air stations Legionowo Wroclaw Leba are used for validation of temperature pressure and water vapour profiles twice daily routine and from one station Legionowo for validation of ozone profiles weekly routine To improve the effectiveness of validation additional ozone soundings are performed in close collocation with relevant satellite observations Nine validation ozone soundings were performed in 2003 eighteen in 2004 and forty in 2005 The radiosoundings selected for the validation must have good time and space coincidence with satellite measurements closer than 3 hours and 200 km The first validation was performed for MIPAS for the year 2003 78 PTU and 9 ozone profiles The radiosounding profiles are available up to altitude of about 35 km while the MIPAS profiles from the altitude approximately 12 km at 8 levels to the height of 35 km with resolution about 3 km so only stratospheric profiles can be evaluated The investigation was executed for original and smoothed radiosounding profiles with 3 km span Preliminary results of MIPAS validation indicate that satellite pressure and ozone concentration profiles are well correlated with radiosounding profiles while temperature profiles do not correlate well The
    36th COSPAR Scientific Assembly; 07/2006
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    ABSTRACT: The Match technique was used to determine chemically induced ozone loss inside the stratospheric vortex during the Arctic winter 2002/2003. From end of November 2002, which is the earliest start of a Match campaign ever, until end of March 2003 approximately 800 ozonesondes were launched from 34 stations in the Arctic and mid latitudes. Ozone loss rates were quantified from the beginning of December until mid-March in the vertical region of 400–550K potential temperature. In accordance with the occurrence of a large area of conditions favourable for the formation of polar stratospheric clouds in December ozone destruction rates varied between 10–15 ppbv/day depending on height. Maximum loss rates around 35 ppbv/day were reached during late January. Afterwards ozone loss rates decreased until mid-March when the final warming of the vortex began. In the period from 2 December 2002 to 16 March 2003 the accumulated ozone loss reduced the partial ozone column of 400–500K potential temperature by 56±4 DU. This value is in good agreement with that inferred from the empirical relation of ozone loss against the volume of potential polar stratospheric clouds within the northern hemisphere. The sensitivity of the results on recent improvements of the approach has been tested.
    Atmospheric Chemistry and Physics 07/2006; · 4.88 Impact Factor
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    ABSTRACT: A solar occultation sensor, the Improved Limb Atmospheric Spectrometer (ILAS)-II, measured 5890 vertical profiles of ozone concentrations in the stratosphere and lower mesosphere and of other species from January to October 2003. The measurement latitude coverage was 54–71�N and 64–88�S, which is similar to the coverage of ILAS (November 1996 to June 1997). One purpose of the ILAS-II measurements was to continue such high-latitude measurements of ozone and its related chemical species in order to help accurately determine their trends. The present paper assesses the quality of ozone data in the version 1.4 retrieval algorithm, through comparisons with results obtained from comprehensive ozonesonde measurements and four satellite-borne solar occultation sensors. In the Northern Hemisphere (NH), the ILAS-II ozone data agree with the other data within ±10% (in terms of the absolute difference divided by its mean value) at altitudes between 11 and 40 km, with the median coincident ILAS-II profiles being systematically up to 10% higher below 20 km and up to 10% lower between 21 and 40 km after screening possible suspicious retrievals. Above 41 km, the negative bias between the NH ILAS-II ozone data and the other data increases with increasing altitude and reaches 30% at 61–65 km. In the Southern Hemisphere, the ILAS-II ozone data agree with the other data within ±10% in the altitude range of 11–60 km, with the median coincident profiles being on average up to 10% higher below 20 km and up to 10% lower above 20 km.
    Journal of Geophysical Research 03/2006; 111(D11S02):1-15. · 3.17 Impact Factor
  • B. Kois, Z. Litynska, A. Jaczewski
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    ABSTRACT: The budget of ozone water vapour and other substances in the UTLS region is influenced by the transport and mixing across the tropopause The research is based mainly on regular ozonesoundings performed in Legionowo Poland 52 40 N 20 97 E since 1979 Until May 1993 the OSE ozone sensor of Brewer Mast type has been used and since June 1993 the ozonesoundings are continued with the ECC sensors Special attention was paid to the ozonopause defined as the bottom layer of ozone rich stratospheric air In most cases the ozonopause can be found easily by visual inspection but in some cases the wavy structure of ozone profile or weak ozone gradient in the UTLS region make some difficulties Profiles of temperature and relative humidity can give additional information The analysis of mutual location of tropopause and ozonopause show cases of tropical advection high tropopause and cases of ozone intrusions into the troposphere low ozonopause For some episodes dispersed throughout the year the ozonopause descended down to the altitude of 4-6 km For studying the origin of the air masses coming over Poland the 3-D backward and forward trajectories are used A unique episode of deep stratospheric intrusion into the troposphere occurred on the 11 th October 2005 The ozone sonde launched at Legionowo on that day revealed record ozone amount in the troposphere 78 D and record ozone mixing ratio near 4km 160 ppbv During earlier episode on the 4 th August 1993 very high ozone values of 100-110 ppbv were observed at Legionowo in the layer
    01/2006;
  • B. Kois, Z. Litynska
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    ABSTRACT: Changes in the UTLS region over Central Europe are presented in connection with global changes during the last 20-30 years The research is based mainly on the series of ozonesoundings and radiosoundings from Poland since 1979 Special attention was paid to two characteristic surfaces within the UTLS region -- the thermal tropopause important for energy balance and the chemopause ozonopause relevant to the transport and mixing of mass and chemical species between the stratosphere and troposphere The ozonopause is defined as the bottom layer of ozone rich stratospheric air In most cases the ozonopause can be found easily by visual inspection but in some cases the wavy structure of ozone profile or weak ozone gradient in the UTLS region make some difficulties Profiles of temperature and relative humidity can give additional information A large change of the structure of the UTLS region has occurred in recent years During the years 1989-2005 the ozonopause on the average was located about 200m below the tropopause whereas the previous estimate for 1979-2000 situated the ozonopause about 600 m below the tropopause It is also noted that the percentage of multiple tropopause has increased since 1979 The ozonopause is next used to separate the cases of tropical advection ozonopause above the tropopause from the cases of middle and higher latitude advection Long term changes of temperature at the tropopause and at the ozonopause are examined in dependence of their mutual location When the ozonopause was located above the thermal tropopause the
    01/2006;
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    ABSTRACT: Abstract. The Match technique was used to determine chemically induced ozone loss inside the stratospheric vortex during the Arctic winter 2002/2003. From end of November 2002, which is the earliest start of a Match campaign ever, until end of March 2003 approximately 800 ozonesondes were launched from 30 stations in the Arctic and mid latitudes. Ozone loss rates were quantified from the beginning of December until mid of March in the vertical region of 400–550 K potential temperature. In December ozone destruction rates varied between 10–15 ppbv/day depending on height. Maximum loss rates around 35 ppbv/day were reached during late January. Afterwards ozone loss rates decreased until mid-March when the final warming of the vortex began and measurements for the campaign were no longer possible. In the period of 2 December 2002 to 16 March 2003 the accumulated ozone loss reduced the partial ozone column of 400–500 K potential temperature by 56±4 DU. The sensitivity of the results on recent improvements of the approach has been tested.
    Atmospheric Chemistry and Physics Discussions. 07/2005;
  • EGS General Assembly; 01/2005
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    ABSTRACT: Abstract. A total ozone depletion of 68±7 Dobson units between 380 and 525K from 10 December 2002 to 10 March 2003 is derived from ozone sonde data by the vortex-average method, taking into account both diabatic descent of the air masses and transport of air into the vortex. When the vortex is divided into three equal-area regions, the results are 85±9DU for the collar region (closest to the edge), 52±5DU for the vortex centre and 68±7DU for the middle region in between centre and collar. Our results compare well with other studies: We find good agreement with ozone loss deduced from SAOZ data, with results inferred from POAM III observations and with results from tracer-tracer correlations using HF as the long-lived tracer. We find a higher ozone loss than that deduced by tracer-tracer correlations using CH4. We have made a careful comparison with Match results: The results were recalculated using a common time period, vortex edge definition and height interval. The two methods generally compare very well, except at the 475K level which exhibits an unexplained discrepancy.
    Atmospheric Chemistry and Physics 01/2005; · 4.88 Impact Factor
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    B. Kois, Z. Litynska, A. Jaczewski
    EGS General Assembly; 01/2005
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    ABSTRACT: Ozone measurements from ozonesondes, AROTAL, DIAL, and POAM III instruments during the SOLVE-2/VINTERSOL period are composited in a time-varying, flow-following quasi-conservative (PV-?) coordinate space; the resulting composites from each instrument are mapped onto the other instruments' locations and times. The mapped data are then used to intercompare data from the different instruments. Overall, the four ozone data sets are found to be in good agreement. AROTAL shows somewhat lower values below 16 km, and DIAL has a positive bias at the upper limits of its altitude range. These intercomparisons are consistent with those obtained from more conventional near-coincident profiles, where available. Although the PV-? mapping technique entails larger uncertainties of individual profile differences compared to direct near-coincident comparisons, the ability to include much larger numbers of comparisons can make this technique advantageous.
    Atmospheric Chemistry and Physics 11/2004; · 4.88 Impact Factor
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    ABSTRACT: A total ozone depletion of 68 Dobson units from 10 December 2002 to 10 March 2003 is derived by the vortex-average method taking into account both diabatic descent of the air masses and transport of air into the vortex. When the vortex is divided into three equal-area regions, the results are 85 DU for the collar region (closest to the edge), 52 DU for the vortex centre and 68 DU for the middle region in between centre and collar.
    Atmospheric Chemistry and Physics Discussions. 10/2004;
  • Quadrennial ozone symposium, Kos, Greece; 01/2004
  • EGU posters; 01/2004
  • A. Curylo, Z. Litynska, B. Kois
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    ABSTRACT: Series of UV-B measurements are relatively short, in Poland UV-B network started since July 1993. On the other hand, total irradiance observations are widespread and cover several decades. So, there is an idea to use the total solar irradiance to reconstruct UV-B in the past. It is especially important for climate research. There have been a few attempts to solve this problem. This work is one of them, following mainly the KNMI (The Netherlands) method. A statistical model has been elaborated. It was parameterised with modelled UV-B, measured and modelled total solar irradiance and GOME total ozone data. The model has been elaborated on the base of measurements from 2000-2002 at Legionowo (52.4N, 21.0E): the multichannel NILU-UV, the broadband UV-Biometer SL501 and total solar irradiation Kipp&Zonen CM6b. For radiative transfer model calculations, the FASTRT (http://zardoz.nilu.no/~olaeng/fastrt/fastrt.html) and the STREAMER v.2.6p (http://stratus.ssec.wisc.edu/streamer/streamer.html) have been used. The method has been tested by reconstruction of UV-B series from total solar irradiance measured at Leba (54.8N, 17.5E) for 2000-2002 and compared with UV-Biometer SL501 measurements. The relative difference between reconstructed and measured UV-B was estimated to about 16 percent. It has been shown that for these kinds of studies, both erythemal and 'physical' UV-B can be used. It has been proved that the cosine error is reduced in the reconstructed irradiance. The sensitivity of the elaborated method on the accuracy of input parameters will be discussed.
    04/2003;
  • Z. Litynska, A. Curylo, B. Kois
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    ABSTRACT: A UV Index forecast method for polish territory has been elaborated in 2000. The forecast has been implemented operationally and is published daily on IMWM home page http://www.imgw.pl during summer months (May-September). Heidke method has been used to validate the total ozone column forecasts. For comparison of the forecasted UV Indices, measurements performed with SL501 Biometers at Leba, Legionowo and Zakopane have been used. UV Index clear sky forecasts of IMWM, DWD and GOME have been compared, with GOME total ozone as a reference. It appears that IMWM forecast elaborated for local conditions (neural network was trained on data from Legionowo and Belsk) can give better results for polish sites than forecasts worked out for larger areas. DWD forecasts underestimate the UV Indices while comparison of IMWM and KNMI forecasts show a difference of 0.2-0.5 UV Index, what can be accounted for different radiative transfer models used in calculations.
    03/2003; -1:10876.
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    ABSTRACT: During Arctic winters with a cold, stable stratospheric circulation, reactions on the surface of polar stratospheric clouds (PSCs) lead to elevated abundances of chlorine monoxide (ClO) that, in the presence of sunlight, destroy ozone. Here we show that PSCs were more widespread during the 1999/2000 Arctic winter than for any other Arctic winter in the past two decades. We have used three fundamentally different approaches to derive the degree of chemical ozone loss from ozonesonde, balloon, aircraft, and satellite instruments. We show that the ozone losses derived from these different instruments and approaches agree very well, resulting in a high level of confidence in the results. Chemical processes led to a 70% reduction of ozone for a region ∼1 km thick of the lower stratosphere, the largest degree of local loss ever reported for the Arctic. The Match analysis of ozonesonde data shows that the accumulated chemical loss of ozone inside the Arctic vortex totaled 117 ± 14 Dobson units (DU) by the end of winter. This loss, combined with dynamical redistribution of air parcels, resulted in a 88 ± 13 DU reduction in total column ozone compared to the amount that would have been present in the absence of any chemical loss. The chemical loss of ozone throughout the winter was nearly balanced by dynamical resupply of ozone to the vortex, resulting in a relatively constant value of total ozone of 340 ± 50 DU between early January and late March. This observation of nearly constant total ozone in the Arctic vortex is in contrast to the increase of total column ozone between January and March that is observed during most years.
    Journal of Geophysical Research 10/2002; · 3.17 Impact Factor
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    ABSTRACT: 1] Ozone observations made by the Airborne Raman Ozone, Temperature, and Aerosol Lidar (AROTEL) and Differential Absorption Lidar (DIAL) on board the NASA DC-8 aircraft, the NOAA in situ instrument on board the NASA ER-2 aircraft, and Third European Stratospheric Experiment on Ozone 2000 (THESEO 2000) ozonesondes are analyzed by applying a quasi-conservative coordinate mapping technique. Measurements from the late winter/early spring SAGE III Ozone Loss and Validation Experiment (SOLVE) period (January through March 2000) are incorporated into a time-varying composite field in a potential vorticity-potential temperature coordinate space; ozone loss rates are calculated both with and without diabatic effects. The average loss rate from mid-January to mid-March near the 450 K isentropic surface in the polar vortex is found to be approximately 0.03 ppmv/d.
    Journal of Geophysical Research 01/2002; 107(8274). · 3.17 Impact Factor
  • Z. Litynska, B. Kois
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    ABSTRACT: The UTLS region can be characterised by two boundary surfaces, the tropopause for energy exchange and the ozonopause for the ozone exchange between the troposphere and stratosphere. A study of the changes of the tropopause temperature and height, as well as mutual relation between the tropopause and the ozonopause heights was performed. The statistical analysis was done on the base of the radiosoundings (since 1963) and ozone soundings data (since 1979) from Legionowo upper-air station. Moreover, the relation between total ozone and tropopause height was analysed, using the Belsk ozone data (since 1963). For trend calculations of the temperature in the UTLS region and the height of the tropopause, a linear regression model was applied. Relevant macro circulation indexes were also included into the model. Significant cooling in the UTLS region in winter, spring and summer and the growth of the tropopause height in winter were found. The negative correlation between monthly means of total ozone and tropopause height is observed for the whole year. However, the annual total ozone maximum in spring is delayed about one month in relation to the lowest tropopause height that occurs at the end of winter. For the years 1980-1992, and especially for the period 1993-2000, in comparison to earlier years 1971-1979, for all months an ozone decrease was observed, the largest in spring. There is a linear relation between the tropopause and ozonopause, with increasing dispersion towards lower tropopause heights. The patterns of annual courses of monthly average tropopause and ozonopause heights are very similar throughout the year. On average, the ozonopause lies about 600m below the tropopause, however, a large dispersion of +/-850m was observed. The ozone changes in the UTLS region and episodes of stratospheric ozone intrusions into the troposphere were analysed on the base on a shorter period, 1993- 2000, and the results will be presented.
    01/2002;