Daan Hubert
(BIRA-IASB),
Sophie Godin-Beekmann
(CNRS), Dr
irina Petropavlovskikh
(NOAA/CIRES)
17/09/2018, 11:00
Daan Hubert
(BIRA-IASB),
Sophie Godin-Beekmann
(CNRS), Dr
irina Petropavlovskikh
(NOAA/CIRES)
17/09/2018, 11:20
0.
First results from the 2017/2018 LidAr VAlidation NDacc Experiment at Observatoire Haute Provence
Wolfgang Steinbrecht
(Deutscher Wetterdienst)
17/09/2018, 14:00
oral
In July 2017 and March 2018, the mobile NDACC reference lidar from NASA GSFC took part in an intercomparison campaign for stratospheric ozone and temperature profiles at the Observatoire Haute Provence in Southern France. Here we report on the initial comparison of
1.) ozone profiles from the NASA lidar, the stratospheric ozone lidar at Haute Provence, ECC sondes, the tropospheric ozone...
Dr
Viktoria Sofieva
(Finnish Meteorological Institute)
17/09/2018, 14:18
oral
The overview of recent new activities related to LOTUS at Finnish Meteorological Institute will be presented.
First, the long-term merged dataset with resolved longitudinal structure, which is developed in the framework of ESA Ozone_cci project, will be presented. The dataset includes the data from GOMOS, MIPAS, SCIAMACHY and OSIRIS; it covers the years from 2002 to present. The dataset...
Mr
Carlo Arosio
(Institute of Environmental Physics, University of Bremen)
17/09/2018, 14:36
oral
A continuous monitoring of the stratospheric ozone layer over a global scale is done by means of several techniques. Observations in limb geometry from satellite platforms provide ozone profiles with a good vertical resolution, spatial and temporal coverage.
SCIAMACHY and OMPS-LP are two satellite instruments able to collect shortwave scattered radiance in limb geometry. Ozone profile data...
Dr
Michael Taylor
(University of Reading)
17/09/2018, 14:54
oral
With the rationalisation of climate data sets brokered from data providers through portals like the C3S Climate Data Store (CDS) and NASA GES-DISC, a key element of quality assurance is the provision of traceable uncertainty information. In important climate data records like total column ozone and ozone vertical profile data sets, ideally one would like uncertainties to be traceable back to a...
Dr
William Ball
(PMOD/WRC Davos & IAC/ETH Zurich)
17/09/2018, 15:12
oral
A lot of effort has been put into acquiring, post-processing, and constructing composite timeseries of ozone observations. It is well documented that much of the uncertainty in long term ozone trends stems from the methodologies applied. Further, often composites lack comparable uncertainties and typically are not independent of each other. These issues lead to difficulties in gaining an...
Daan Hubert
(BIRA-IASB)
17/09/2018, 16:00
Dr
Viktoria Sofieva
(Finnish Meteorological Institute)
18/09/2018, 09:00
Preliminary analyses of seasonal dependence of ozone trends in the stratosphere using the long-term merged datasets will be shown. The first results show that the ozone trends in the tropics depend significantly on season.
Dr
Michael Taylor
(University of Reading)
18/09/2018, 09:20
We present a 5-step method to estimate piecewise linear trends in SBUV MOD v6 monthly zonal mean (MZM) profile ozone timeseries containing gaps (e.g. associated with volcanic perturbations). The method is non-parametric and does not use proxies. In Step 1, an optimised local regression (LOESS) to the porous data is obtained using bootstrap in a way that guarantees trend stationarity via the...
Dr
William Ball
(PMOD/WRC Davos & IAC/ETH Zurich)
18/09/2018, 09:40
DLM has been postulated to be an improvement on standard multiple linear regression (MLR) approaches to timeseries analysis, but it is relatively new and seldom implemented. Among other things, it has three significant advantages over MLR: (i) for trend estimation, no a priori assumption is made about the linear nature of trends, nor when the recovery inflection date in ozone timeseries,...
Dr
irina Petropavlovskikh
(NOAA/CIRES)
18/09/2018, 11:00
Dr
Anne Thompson
18/09/2018, 11:50
Dr
Sophie Godin-Beekmann
(CNRS)
18/09/2018, 14:00
Lidar ozone data have been shown to be very accurate in the range 15 – 25 km. Long-term lidar records are thus ideal data sets to cross-validate satellite ozone records in the lower stratosphere. In this study, we use lidar ozone records spanning more than 20 years from five lidar stations, e.g. Hohenpeissenberg (Germany), Haute-Provence (France), Table Mountain (USA), Mauna Loa (Hawaï, USA)...
Dr
Daniel Kunkel
(Institute for Atmospheric Physics, JGU Mainz)
18/09/2018, 14:20
The upper troposphere / lower stratosphere (UTLS) is affected by the Brewer Dobson Circulation (BDC) as well as transport across the tropopause and the jets. The effect of changes in the dynamical properties on the distribution of tracers in the UTLS is therefore difficult to detect, since it involves the coupling of transport and mixing processes on very different temporal and spatial...
Dr
William Ball
(PMOD/WRC Davos & IAC/ETH Zurich)
18/09/2018, 14:40
Dr
Kleareti Tourpali
(Lab of Atmospheric Physics, Aristotle University of Thessaloniki, Greece)
18/09/2018, 16:00
oral
Changes and trends in the vertical distribution of ozone in the recent past
Dr
Viktoria Sofieva
(Finnish Meteorological Institute)
19/09/2018, 09:00
oral
Review of what has been done during Phase 1. Listing of challenges and open issues.
Dr
Jeannette Wild
(ESSIC/UMD, NOAA/NCEP/CPC)
poster
Since the signing of the Montreal Protocol in 1987 and its subsequent agreements banning anthropogenic ozone depleting substances (ODS) the climate community has been anticipating the ability to detect the recovery of the ozone layer. This recovery is complicated by climate changes associated with the increase of CO2 in the both the troposphere and stratosphere. The Climate Prediction Center...
Prof.
Christos Zerefos
(Academy of Athens)
poster
This study analyses vertical ozone trends from lidar measurements, ozone sondes and SBUV/2 satellite overpasses at Hohenpeissenberg, Haute Provence, Table Mountain, Mauna Loa and Lauder for the period 1998 to 2016. The analysis focuses on stratospheric, tropospheric and total ozone using observed and modelled ozone. Measurements are compared with chemical transport model simulations from the...
Dr
Viktoria Sofieva
(Finnish Meteorological Institute)
poster
Recent years have seen strong activity on determining stratospheric ozone trends in order to find signs of recovery. Some weak positive signs have been detected, but also signs of continuing ozone loss. Satellites are needed to make sound judgments about global trends but trend analysis is still hampered by the short time coverage of measurements. Therefore, new combined and harmonised time...
Leonie Bernet
(Institute of Applied Physics, University of Bern, Bern, Switzerland and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland)
poster
After the Montreal protocol banned ozone depleting substances in 1987, first signs of an ozone recovery in the stratosphere were observed starting in 1997. Recent studies have confirmed that mid-latitudinal ozone is increasing in the middle stratosphere due to chemical and dynamical effects, whereas evidence for a continuous decrease in the lower stratosphere exists. To improve trend...
Dr
Eliane Maillard Barras
(MeteoSwiss)
poster
The LOTUS report has put into evidence discrepancies between the post-1998 ozone trends by NH microwave radiometers (MWR) and the others ground-based (GB) instruments (LIDAR, DOBSON Umkehr, FTIR). The NH MWR radiometers show high trend values in the middle stratosphere and negative trend values in the low mesosphere. In this study, we investigated the Payerne MWR dataset and trends.
A...
