Katerina Garane

Aristotle University of Thessaloniki | AUTH · School of Physics

Water vapor plays an important role in the greenhouse effect, rendering it an atmospheric constituent that requires continuous and global monitoring by different types of remote sensing instruments. The TROPOspheric Monitoring Instrument Sentinel-5 Precursor (TROPOMI/S5P) Total Column Water Vapor (TCWV) is a new product retrieved from the visible b...

Water vapor plays a very important role on the greenhouse effect, rendering it an atmospheric constituent that requires continuous and global monitoring by different types of remote sensing instruments. The TROPOMI/S5P Total Column Water Vapor (TCWV) is a new product retrieved from the blue wavelength band (435 –455 nm), using an algorithm that was...

Operational monitoring of aerosol properties are performed routinely at the Laboratory of Atmospheric Physics, Thessaloniki (40.63°, 22.95°, 60m asl), Greece, using a combination of different ground-based instruments. These include both a single and double Brewer spectrophotometer, a multi wavelength Depolarization Raman Lidar, and a CIMEL photomet...

The very important role of water vapor on the greenhouse effect makes it a species that needs to be continuously and globally monitored, as well as thoroughly studied. The TROPOMI/S5P Total Column Water Vapor (TCWV) is a new product retrieved from the blue wavelength band (435 –455nm), using an algorithm that was originally developed for GOME-2. Th...

The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor (S5P) satellite was launched on 13 October 2017 to provide the atmospheric composition for atmosphere and climate research. The S5P is a Sun-synchronous polar-orbiting satellite providing global daily coverage. The TROPOMI swath is 2600 km wide, and the ground resolut...

In this manuscript we present the concept of a novel algorithmic chain that aims to a dataset of unprecedented detail in the vertical distribution of multiple atmospheric components in near real time conditions. The analysis will be based on the following remote sensing instruments: a depolarization Raman lidar, a visible and a thermal all-sky came...

Review of the existing bibliography shows that the direction and magnitude of the long-term trends of UV irradiance, and their main drivers, vary significantly throughout Europe. Analysis of total ozone and spectral UV data recorded at four European stations during 1996-2017 reveals that long-term changes in UV are mainly driven by changes in aeros...

Review of the existing bibliography shows that the direction and magnitude of the long-term trends of UV irradiance, and their main drivers, vary significantly throughout Europe. Analysis of total ozone and spectral UV data recorded at four European stations during 1996 – 2017 reveals that long-term changes in UV are mainly driven by changes in aer...

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 kno...

In this manuscript we present the concept of a novel algorithmic chain that aims to a dataset of unprecedented detail in the vertical distribution of multiple atmospheric components in near real time conditions. The analysis will be based on the following remote sensing instruments: a depolarization Raman lidar, a visible and a thermal all-sky came...

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 x 3.5 km and is expected to extend the atmospheric composition record initiated with GOME/ERS-2 in 1995, bringing up significant new components...

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, bringing up significant new c...

Operational monitoring of atmospheric gaseous and particular species of both tropospheric as well as stratospheric provenance sensed by satellite instruments are performed routinely in the Laboratory of Atmospheric Physics, Thessaloniki, Greece, using a suite of different ground based instruments. These include both a single and double Brewer spect...

In this work we present the validation results of almost one year of TROPOMI Near Real Time (NRTI) and OFFLine (OFFL) data against ground-based quality-assured Brewer and Dobson total ozone column (TOC) measurements deposited in the World Ozone and Ultraviolet Radiation Data Center (WOUDC). Additionally, comparisons to Brewer measurements from the...

The Sentinel-5 Precursor (S5P) mission, launched in October 2017, started the operational atmospheric composition measurements from space as part of the European Copernicus programme. The payload of the S5P mission is the TROPOspheric Monitoring Instrument (TROPOMI) that provides key information on air quality, climate and the ozone layer with high...

The Tropospheric Monitoring Instrument, TROPOMI, is the payload instrument for the Sentinel 5 Precursor (S5P) mission, launched in October 2017. TROPOMI will extend the atmospheric composition record initiated with GOME/ERS-2 in 1996 and continued with the SCIAMACHY/ENVISAT, OMI/AURA and the two GOME-2/MetOp missions, until 2024 in the least, measu...

This paper assesses the quality of IASI (Infrared Atmospheric Sounding Interferometer)/Metop-A (IASI-A) and IASI/Metop-B (IASI-B) ozone (O3) products (total and partial O3 columns) retrieved with the Fast Optimal Retrievals on Layers for IASI Ozone (FORLI-O3; v20151001) software for 9 years (2008–July 2017) through an extensive intercomparison and...

Atmospheric ozone plays a key role in air quality and the radiation budget of the Earth, both directly and through its chemical influence on other trace gases. Assessments of the atmospheric ozone distribution and associated climate change therefore demand accurate vertically resolved ozone observations with both stratospheric and tropospheric sens...

n October 2017 the Sentinel-5P (S5P) was launched into space. The total ozone data of the TROPOspheric Monitoring Instrument (TROPOMI) on S5P are retrieved in near-real-time using the well established DOAS approach, and a subsequent conversion of the retrieved slant column densities into vertical column densities using an iterative air mass factor...

The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) is a level-3 data record, which combines individual sensor products into one single cohesive record covering the 22-year period from 1995 to 2016, generated in the frame of the European Space Agency's Climate Change Initiative Phase II. It is based on level-2 total ozone data produced b...

Measurements of atmospheric gaseous and particular species of both tropospheric, as well as stratospheric provenance, are performed routinely and operationally in the Laboratory of Atmospheric Physics (LAP), Thessaloniki, Greece, using a suite of different ground based instruments. These include both a single and double Brewer spectrophotometer, a...

This paper assesses the quality of IASI/Metop-A (IASI-A) and IASI/Metop-B (IASI-B) ozone (O3) products (total and partial O3 columns) retrieved with the Fast Optimal Retrievals on Layers for IASI Ozone (FORLI-O3) v20151001 software for nine years (2008–2017) through an extensive inter-comparison and validation exercise using independent observation...

Atmospheric ozone plays a key role in air quality and the radiation budget of the Earth, both directly and through its chemical influence on other trace gases. Assessments of the atmospheric ozone distribution and associated climate change therefore demand accurate vertically-resolved ozone observations with both stratospheric and tropospheric sens...

The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) is a Level-3 data record, which combines individual sensor products into one single cohesive record covering the 22 year period from 1995 to 2017, generated in the frame of the European Space Agency's Climate Change Initiative Phase-II. It is based on Level-2 total ozone data produced b...

Spectral measurements of global UV irradiance recorded by Brewer spectrophotometers can be significantly affected by instrument-specific optical and mechanical features. Thus, proper corrections are needed in order to reduce the associated uncertainties to within acceptable levels. The present study aims to contribute to the reduction of uncertaint...

Observations of atmospheric composition and solar radiation in Thessaloniki, Greece The GAW station at Thessaloniki Monitoring of atmospheric composition Monitoring of solar and atmospheric radiation Vertical profiles of aerosols and ozone

The impact of cruise and passenger ship emissions on air quality and human health risk in the greater Thessaloniki area has been studied for the present and future time. The study focuses on the pollutants regulated by the EU legislation. Simulations have been performed using the CALPUFF dispersion model for 2013, in order to estimate the pollutant...

China experienced major heat waves in summer 2013, being the worst the last 140 years in Eastern China. The RegCM-Chem4 climate-chemistry model was applied over China for the summer 2013 with a spatial resolution of 60 km and hourly temporal analysis. This study focuses on the examination of the RegCM-Chem4 performance in the simulation of ozone le...

For the annual course of the long-term monthly means of the daily integrals of irradiance at 305 nm and 324 nm, and of the CIE-weighted and UV-B integrals, Thessaloniki has by far the highest values, while the Scandinavian stations of Sodankyla, Jokioinen and Norrkoping the lowest. The same pattern appears also for the maximum values (Figure 1). At...

Factors affecting the solar spectral ultraviolet (UV) irradiance at Thessaloniki, Greece were investigated using measurements with single-and double-monochromator Brewer spectroradiometer, which started operating respectively in 1989 and 1993 and continue up to the present. The two data records were quality controlled, homogenized and finally merge...

We present a re-evaluation and quality control of spectral ultraviolet irradiance measurements from two Brewer spectroradiometers operating regularly at Thessaloniki, Greece. The calibration history of the two instruments was re-examined and data flaws were identified by comparing quasi synchronous measurements. Analysis of the sensitivity of both...

The stratospheric ozone depletion during the last two decades, the increase of UV-B irradiance levels at the ground and the possible impact on the biosphere has led scientists to develop and use instruments of high accuracy for UV measurements. During the last two years, 9 UV stations have been established in different environments in Greece and Cy...

The decrease in stratospheric ozone observed during last decades and the possible relationship with the observed increase UV-B radiation in biosphere has been extensively discussed in relevant studies. However, the detection of UV trends is difficult due to lack of long-term measurements of UV radiation at the Earth's surface, and the large variabi...

Satellite-derived ultraviolet (UV) irradiances may form the basis for estab-lishing a global UV climatology, provided that their accuracy is confirmed against ground-based measurements of known quality. In this study quality-checked spectral UV irradiance measurements from four European stations (Sodankyla, Finland; Bilthoven, The Netherlands; Ispr...

This paper introduces a device that was developed to measure the angular response of UV spectroradiometers in the field. This device is designed to be used at the operating position of spectroradiometers; thus the derived angular response also includes any effects from imperfect leveling of the diffuser and corresponds to the actual operational ang...

The temporal variability of global ultraviolet solar spectral irradiance measured regularly at Thessaloniki, Greece during the last 15 years is presented. The measurements were conducted by a single- and a double-monochromator Brewer spectroradiometers which operate at the Laboratory of Atmospheric Physics since 1989 and 1993, respectively. Recentl...

We present three different methods for the absolute calibration of direct spectral irradiances measured with a Brewer spectroradiometer, which are shown to agree to within +/- 2%. Direct irradiance spectra derived by Brewer and Bentham spectroradiometers agree to within 4 +/- 3%. Good agreement was also found by a comparison of the aerosol optical...

In this paper the time series of the measurements performed at Thessaloniki during the time period 1989-2003, is presented. The instruments used for the monitoring of erythemal, UVB+UVA, UVA and total radiation are broadband detectors. The spectral irradiance is monitored by two Brewer spectroradiometers, one single and one double. The single spect...

In the last few years the enhancement of solar ultraviolet radiation reaching the Earth’s surface, expected due to ozone depletion, is evident in many locations (WMO/UNEP, 1998). This observation has increased the scientific interest worldwide because of the biological, ecological and chemical impacts of UV radiation. The effects of UV radiation de...

A comparison of satellite-derived surface UV irradiances with spectroradiometric measurements performed regularly at Thessaloniki, Greece is presented. The satellite irradiances were used for constructing maps of solar ultraviolet radiation over Europe based on a method that combines the use of a standard radiative transfer code (UVspec) and variou...

Factors affecting the solar spectral UV irradiance at Thessaloniki, Greece, are investigated using measurements with a single- and a double-monochromator Brewer spectroradiometers, which started operating respectively in 1989 and 1993 and continue up to present. The two data records have been quality controlled, homogenized and finally merged to on...