scholarly journals Brewer spectrometer total ozone column measurements in Sodankylä

2016 ◽  
Author(s):  
T. Karppinen ◽  
K. Lakkala ◽  
J. M. Karhu ◽  
P. Heikkinen ◽  
R. Kivi ◽  
...  
Keyword(s):  
Time Series ◽  
Reference Point ◽  
Total Ozone ◽  
Montreal Protocol ◽  
High Quality ◽  
Automatic Data ◽  
Mean Values ◽  
Total Ozone Column ◽  
Ozone Column

Abstract. Abstract. The Brewer total ozone column measurements started in Sodankylä in May 1988, 9 months after the agreement of The Montreal Protocol. The Brewer instrument has been well maintained and frequently calibrated since to produce a high quality ozone time series now spanning over 26 years. The data has now been uniformly reprocessed between 1988 and 2014. The quality of the data has been assured by automatic data rejection rules as well as by manual checking. The daily mean values calculated from highest quality direct sun measurements are available 77 % of time with up to 75 measurements per day on a clear day. Zenith sky measurements fill another 14 % of the time series and winter months are sparsely covered by moon measurements. The time series provides information to survey the evolution of Arctic ozone layer and can be used as a reference point for assessing other total ozone column measurement practises.

scholarly journals Brewer spectrometer total ozone column measurements in Sodankylä

2016 ◽  
Vol 5 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Tomi Karppinen ◽  
Kaisa Lakkala ◽  
Juha M. Karhu ◽  
Pauli Heikkinen ◽  
Rigel Kivi ◽  
...  
Keyword(s):  
Time Series ◽  
Total Ozone ◽  
Montreal Protocol ◽  
High Quality ◽  
Automatic Data ◽  
Mean Values ◽  
Total Ozone Column ◽  
Measurement Practices ◽  
Ozone Column

Abstract. Brewer total ozone column measurements started in Sodankylä in May 1988, 9 months after the signing of The Montreal Protocol. The Brewer instrument has been well maintained and frequently calibrated since then to produce a high-quality ozone time series now spanning more than 25 years. The data have now been uniformly reprocessed between 1988 and 2014. The quality of the data has been assured by automatic data rejection rules as well as by manual checking. Daily mean values calculated from the highest-quality direct sun measurements are available 77 % of time with up to 75 measurements per day on clear days. Zenith sky measurements fill another 14 % of the time series and winter months are sparsely covered by moon measurements. The time series provides information to survey the evolution of Arctic ozone layer and can be used as a reference point for assessing other total ozone column measurement practices.

scholarly journals Evaluation of Total Ozone Column from Multiple Satellite Measurements in the Antarctic Using the Brewer Spectrophotometer

2021 ◽  
Vol 13 (8) ◽  
pp. 1594
Author(s):  
Songkang Kim ◽  
Sang-Jong Park ◽  
Hana Lee ◽  
Dha Hyun Ahn ◽  
Yeonjin Jung ◽  
...  
Keyword(s):  
Satellite Data ◽  
Total Ozone ◽  
Spatiotemporal Pattern ◽  
Satellite Measurements ◽  
Austral Spring ◽  
Total Ozone Column ◽  
Brewer Spectrophotometer ◽  
The Antarctic ◽  
Ozone Column

The ground-based ozone observation instrument, Brewer spectrophotometer (Brewer), was used to evaluate the quality of the total ozone column (TOC) produced by multiple polar-orbit satellite measurements at three stations in Antarctica (King Sejong, Jang Bogo, and Zhongshan stations). While all satellite TOCs showed high correlations with Brewer TOCs (R = ~0.8 to 0.9), there are some TOC differences among satellite data in austral spring, which is mainly attributed to the bias of Atmospheric Infrared Sounder (AIRS) TOC. The quality of satellite TOCs is consistent between Level 2 and 3 data, implying that “which satellite TOC is used” can induce larger uncertainty than “which spatial resolution is used” for the investigation of the Antarctic TOC pattern. Additionally, the quality of satellite TOC is regionally different (e.g., OMI TOC is a little higher at the King Sejong station, but lower at the Zhongshan station than the Brewer TOC). Thus, it seems necessary to consider the difference of multiple satellite data for better assessing the spatiotemporal pattern of Antarctic TOC.

scholarly journals Reconstruction and analysis of erythemal UV radiation time series from Hradec Králové (Czech Republic) over the past 50 years

2017 ◽  
Author(s):  
Klára Čížková ◽  
Kamil Láska ◽  
Ladislav Metelka ◽  
Martin Staněk
Keyword(s):  
Time Series ◽  
Czech Republic ◽  
Uv Radiation ◽  
Total Ozone ◽  
Cloud Cover ◽  
Radiation Doses ◽  
Total Ozone Column ◽  
Ozone Column ◽  
Radiation Time ◽  
Very High

Abstract. This paper evaluates the variability of erythemal ultraviolet (EUV) radiation from Hradec Králové (Czech Republic) in the period 1964–2013. The EUV radiation time series was reconstructed using a radiative transfer model and additional empirical relationships with the root mean square error of 9.9 %. The reconstructed time series documented the increase in EUV radiation doses in the 1980s and the 1990s (up to 15 % per decade), which is linked to the steep decline in total ozone (10 % per decade). The changes of cloud cover were the major factor affecting the EUV radiation doses especially in the 1960s, 1970s, and at the beginning of the new millennium. The mean annual EUV radiation doses in the decade 2004–2013 declined by 5 %. The factors affecting the EUV radiation doses differed also according to the chosen integration period (daily, monthly, and annually): solar zenith angle was the most important for daily doses, cloud cover for their monthly means, and the annual means of EUV radiation doses were most influenced by total ozone column. The number of days with very high EUV radiation doses increased by 22 % per decade, the increase was statistically significant in all seasons except autumn. The occurrence of the days with very high EUV doses was influenced mostly by low total ozone column (82 % of days), clear-sky or partly cloudy conditions (74 % of days) and by increased surface albedo (19 % of days). The principal component analysis documented that the occurrence of days with very high EUV radiation doses was much affected by the positive phase of North Atlantic Oscillation with an Azores High promontory reaching over central Europe. In the stratosphere, a strong Arctic circumpolar vortex and also the meridional inflow of ozone-poor air from the south-west were favorable for the occurrence of days with very high EUV radiation doses. This is the first analysis of the relationship between the high EUV radiation doses and macro-scale circulation patterns, and therefore more attention should be given also to other dynamical variables that may affect the solar UV radiation on the Earth surface.

scholarly journals TROPOMI/S5P total ozone column data: global ground-based validation and consistency with other satellite missions

2019 ◽  
Vol 12 (10) ◽  
pp. 5263-5287 ◽  
Author(s):  
Katerina Garane ◽  
Maria-Elissavet Koukouli ◽  
Tijl Verhoelst ◽  
Christophe Lerot ◽  
Klaus-Peter Heue ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Spatial Resolution ◽  
Total Ozone ◽  
Optical Absorption Spectroscopy ◽  
Total Ozone Column ◽  
Global Comparison ◽  
The Mean ◽  
Ozone Monitoring ◽  
Ozone Column

Abstract. In October 2017, the Sentinel-5 Precursor (S5P) mission was launched, carrying the TROPOspheric Monitoring Instrument (TROPOMI), which provides a daily global coverage at a spatial resolution as high as 7 km × 3.5 km and is expected to extend the European atmospheric composition record initiated with GOME/ERS-2 in 1995, enhancing our scientific knowledge of atmospheric processes with its unprecedented spatial resolution. Due to the ongoing need to understand and monitor the recovery of the ozone layer, as well as the evolution of tropospheric pollution, total ozone remains one of the leading species of interest during this mission. In this work, the TROPOMI near real time (NRTI) and offline (OFFL) total ozone column (TOC) products are presented and compared to daily ground-based quality-assured Brewer and Dobson TOC measurements deposited in the World Ozone and Ultraviolet Radiation Data Centre (WOUDC). Additional comparisons to individual Brewer measurements from the Canadian Brewer Network and the European Brewer Network (Eubrewnet) are performed. Furthermore, twilight zenith-sky measurements obtained with ZSL-DOAS (Zenith Scattered Light Differential Optical Absorption Spectroscopy) instruments, which form part of the SAOZ network (Système d'Analyse par Observation Zénitale), are used for the validation. The quality of the TROPOMI TOC data is evaluated in terms of the influence of location, solar zenith angle, viewing angle, season, effective temperature, surface albedo and clouds. For this purpose, globally distributed ground-based measurements have been utilized as the background truth. The overall statistical analysis of the global comparison shows that the mean bias and the mean standard deviation of the percentage difference between TROPOMI and ground-based TOC is within 0 –1.5 % and 2.5 %–4.5 %, respectively. The mean bias that results from the comparisons is well within the S5P product requirements, while the mean standard deviation is very close to those limits, especially considering that the statistics shown here originate both from the satellite and the ground-based measurements. Additionally, the TROPOMI OFFL and NRTI products are evaluated against already known spaceborne sensors, namely, the Ozone Mapping Profiler Suite, on board the Suomi National Polar-orbiting Partnership (OMPS/Suomi-NPP), NASA v2 TOCs, and the Global Ozone Monitoring Experiment 2 (GOME-2), on board the Metop-A (GOME-2/Metop-A) and Metop-B (GOME-2/Metop-B) satellites. This analysis shows a very good agreement for both TROPOMI products with well-established instruments, with the absolute differences in mean bias and mean standard deviation being below +0.7 % and 1 %, respectively. These results assure the scientific community of the good quality of the TROPOMI TOC products during its first year of operation and enhance the already prevalent expectation that TROPOMI/S5P will play a very significant role in the continuity of ozone monitoring from space.

scholarly journals On the compatibility of Brewer total column ozone measurements in two adjacent valleys (Arosa and Davos) in the Swiss Alps

2017 ◽  
Author(s):  
René Stübi ◽  
Herbert Schill ◽  
Jörg Klausen ◽  
Laurent Vuilleumier ◽  
Jülian Gröbner ◽  
...  
Keyword(s):  
Time Series ◽  
Total Ozone ◽  
Stray Light ◽  
Swiss Alps ◽  
Total Column Ozone ◽  
Total Ozone Column ◽  
Set Up ◽  
Data Continuity ◽  
Ozone Column

Abstract. The Arosa site is well known in the ozone community for its continuous total ozone column observations recorded since 1926. Originally based on Dobson sun spectrophotometers, the site has been gradually complemented by three automatic Brewer instruments, in operation since 1998. To secure the long term ozone monitoring in this Alpine region and to benefit from synergies with the World Radiation Center, the feasibility of moving this activity to the nearby site at Davos (aerial distance of 13 km) has 5 been explored. Concerns about a possible rupture of the 90 years long record has motivated a careful comparison of the two sites since great attention to the data continuity and quality has always been central to the operations of the observatory at Arosa. To this end, one element of the Arosa Brewer triad has been set up at the Davos site since November 2011 to realize a campaign of parallel measurements and to study the deviations between the three Brewer instruments. The analysis of the coincident measurements shows that the différences between Arosa and Davos remain within the range of the 10 long term stability of the Brewer instruments. A non-significant seasonal cycle is observed, which could possibly be induced by a stray light bias and the altitude difference between the two sites. These differences are shown to be lower than the short term variability of the time series and the overall uncertainty from individual Brewer instruments and therefore are not statistically significant. It is therefore concluded that the world’s longest time series of the total ozone column obtained at Arosa site could be safely extended and continued with measurements taken from instruments located at the nearby Davos site without 15 introducing a bias in this unique record.

scholarly journals On the compatibility of Brewer total column ozone measurements in two adjacent valleys (Arosa and Davos) in the Swiss Alps

2017 ◽  
Vol 10 (11) ◽  
pp. 4479-4490 ◽  
Author(s):  
René Stübi ◽  
Herbert Schill ◽  
Jörg Klausen ◽  
Laurent Vuilleumier ◽  
Julian Gröbner ◽  
...  
Keyword(s):  
Time Series ◽  
Total Ozone ◽  
Stray Light ◽  
Swiss Alps ◽  
Total Column Ozone ◽  
Total Ozone Column ◽  
Set Up ◽  
Data Continuity ◽  
Ozone Column

Abstract. The Arosa site is well known in the ozone community for its continuous total ozone column observations that have been recorded since 1926. Originally based on Dobson sun spectrophotometers, the site has been gradually complemented by three automatic Brewer instruments, in operation since 1998. To secure the long-term ozone monitoring in this Alpine region and to benefit from synergies with the World Radiation Center, the feasibility of moving this activity to the nearby site at Davos (aerial distance of 13 km) has been explored. Concerns about a possible rupture of the 90-year-long record has motivated a careful comparison of the two sites, since great attention to the data continuity and quality has always been central to the operations of the observatory at Arosa. To this end, one element of the Arosa Brewer triad has been set up at the Davos site since November 2011 to realize a campaign of parallel measurements and to study the deviations between the three Brewer instruments. The analysis of the coincident measurement shows that the differences between Arosa and Davos remain within the range of the long-term stability of the Brewer instruments. A nonsignificant seasonal cycle is observed, which could possibly be induced by a stray-light bias and the altitude difference between the two sites. These differences are shown to be lower than the short-term variability of the time series and the overall uncertainty from individual Brewer instruments and therefore are not statistically significant. It is therefore concluded that the world's longest time series of the total ozone column obtained at Arosa site could be safely extended and continued with measurements taken from instruments located at the nearby Davos site without introducing a bias to this unique record.

scholarly journals Total ozone column above the territory of Serbia and Montenegro

2006 ◽  
Vol 134 (5-6) ◽  
pp. 234-237 ◽  
Author(s):  
Milorad Letic
Keyword(s):  
Total Ozone ◽  
Mean Values ◽  
Annual Cycles ◽  
Serbia And Montenegro ◽  
Total Ozone Column ◽  
Northern Latitudes ◽  
Skin Cancers ◽  
Cyclic Changes ◽  
Ozone Column

Introduction: Atmospheric ozone attenuates ultraviolet radiation reaching the Earth?s surface. Since UV-B radiation is considered the principal factor of causing the skin cancers, cataracts and some immunological disorders, determination of total ozone column has become everyday practice. In Serbia and Montenegro, such determinations are not being done. Satellite data for the entire globe are accessible. Objective: The objective of our work was to collect and analyze data for the territory of Serbia and Montenegro, because ozone is an important parameter for the study of effects and protection from UV radiation. METHODS Data collected during TOMS (Total Ozone Measuring Spectrometer) experiment are presented for grid whose elements are 1? latitude by 1.25? longitude. Grid elements in which the territory of Serbia and Montenegro comprises more than 50% of the element area were taken to represent the territory of Serbia and Montenegro. Eleven grid elements were selected and average monthly values for 272 months in the period from 1978 until 2004 were collected. Data for the period between 1993 and 1996 were unavailable. Results: Mean values of total ozone column and mean monthly values of eleven grid elements differed very little. Differences were smaller than magnitudes of random error. Average annual values of total ozone column above the territory of Serbia and Montenegro were in the range from 316 Dobson units (DU) in 2002 to 347 DU in 1981. Annual cyclic changes of total ozone column showed spring maxima and autumn minima. Maximal recorded monthly value was 421 DU in March 1987 and minimal monthly value was 271 DU in October 2001. There was a trend of decreasing total ozone column values in the period between 1979 and 1992 at the rate of approximately 4.5% per decade. Conclusion: Mean total ozone column value above the territory of Serbia and Montenegro can represent total ozone column for the whole territory. Annual cycles with spring maxima and autumn minima are in accordance with oscillations observed for middle northern latitudes. The trend showing 4.5% decrease per decade in the period between 1979 and 1992 corresponds well to trends calculated for comparable locations.

scholarly journals Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil

2017 ◽  
Vol 35 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Lucas Vaz Peres ◽  
Hassan Bencherif ◽  
Nkanyiso Mbatha ◽  
André Passaglia Schuch ◽  
Abdoulwahab Mohamed Toihir ◽  
...  
Keyword(s):  
Time Series ◽  
Total Ozone ◽  
Ozone Monitoring Instrument ◽  
Space Observatory ◽  
Main Mode ◽  
Quasi Biennial Oscillation ◽  
Total Ozone Column ◽  
Brewer Spectrophotometer ◽  
Ozone Column ◽  
Satellite Instruments

Abstract. This paper presents 23 years (1992–2014) of quasi-continuous measurements of the total ozone column (TOC) over the Southern Space Observatory (SSO) in São Martinho da Serra, Brazil (29.26° S, 53.48° and 488 m altitude). The TOC was measured by a Brewer spectrometer, and the results are also compared to daily and monthly observations from the TOMS (Total Ozone Mapping Spectrometer) and OMI (Ozone Monitoring Instrument) satellite instruments. Analyses of the main interannual modes of variability computed using the wavelet transform method were performed. A favorable agreement between the Brewer spectrophotometer and satellite datasets was found. The seasonal TOC variation is dominated by an annual cycle, with a minimum of approximately 260 DU in April and a maximum of approximately 295 DU in September. The wavelet analysis applied in the SSO TOC anomaly time series revealed that the Quasi-Biennial Oscillation (QBO) modulation was the main mode of interannual variability. The comparison between the SSO TOC anomaly time series with the QBO index revealed that the two are in opposite phases.

scholarly journals Reconstruction and analysis of erythemal UV radiation time series from Hradec Králové (Czech Republic) over the past 50 years

2018 ◽  
Vol 18 (3) ◽  
pp. 1805-1818 ◽  
Author(s):  
Klára Čížková ◽  
Kamil Láska ◽  
Ladislav Metelka ◽  
Martin Staněk
Keyword(s):  
Time Series ◽  
Czech Republic ◽  
Uv Radiation ◽  
Total Ozone ◽  
Cloud Cover ◽  
Radiation Doses ◽  
Total Ozone Column ◽  
Ozone Column ◽  
Radiation Time ◽  
Very High

Abstract. This paper evaluates the variability of erythemal ultraviolet (EUV) radiation from Hradec Králové (Czech Republic) in the period 1964–2013. The EUV radiation time series was reconstructed using a radiative transfer model and additional empirical relationships, with the final root mean square error of 9.9 %. The reconstructed time series documented the increase in EUV radiation doses in the 1980s and the 1990s (up to 15 % per decade), which was linked to the steep decline in total ozone (10 % per decade). The changes in cloud cover were the major factor affecting the EUV radiation doses especially in the 1960s, 1970s, and at the beginning of the new millennium. The mean annual EUV radiation doses in the decade 2004–2013 declined by 5 %. The factors affecting the EUV radiation doses differed also according to the chosen integration period (daily, monthly, and annually): solar zenith angle was the most important for daily doses, cloud cover, and surface UV albedo for their monthly means, and the annual means of EUV radiation doses were most influenced by total ozone column. The number of days with very high EUV radiation doses increased by 22 % per decade, the increase was statistically significant in all seasons except autumn. The occurrence of the days with very high EUV doses was influenced mostly by low total ozone column (82 % of days), clear-sky or partly cloudy conditions (74 % of days) and by increased surface albedo (19 % of days). The principal component analysis documented that the occurrence of days with very high EUV radiation doses was much affected by the positive phase of North Atlantic Oscillation with an Azores High promontory reaching over central Europe. In the stratosphere, a strong Arctic circumpolar vortex and the meridional inflow of ozone-poor air from the southwest were favorable for the occurrence of days with very high EUV radiation doses. This is the first analysis of the relationship between the high EUV radiation doses and macroscale circulation patterns, and therefore more attention should be given also to other dynamical variables that may affect the solar UV radiation on the Earth surface.

Validation of gome total ozone column with the assimilation model KNMI

1998 ◽  
Vol 22 (11) ◽  
pp. 1501-1504
Author(s):  
A.J.M Piters ◽  
P.F Levelt ◽  
M.A.F Allaart ◽  
H.M Kelder
Keyword(s):  
Total Ozone ◽  
Total Ozone Column ◽  
Ozone Column ◽  
Assimilation Model
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