Abstract
Abstract. We present an analysis of the diurnal ozone cycle from 1 year of continuous ozone measurements from two ground-based microwave radiometers in the Arctic. The instruments GROMOS-C and OZORAM are located at the AWIPEV research base at Ny-Ålesund, Svalbard (79° N, 12° E), and gathered a comprehensive time series of middle-atmospheric ozone profiles with a high time resolution. An intercomparison was performed with EOS MLS and ozone sonde measurements and simulations with SD-WACCM. The measured data sets were used to study the photochemically induced diurnal cycle of ozone in the stratosphere and mesosphere. Throughout the year the insolation in the Arctic changes drastically from polar night to polar day. Accordingly, the seasonal variations in the diurnal ozone cycle are large. In the stratosphere we found a diurnal cycle throughout the entire period of polar day with the largest amplitude in April. In the mesosphere a diurnal cycle was detected in spring and fall. SD-WACCM has been proven to capture the diurnal cycle well and was therefore used to analyse the chemical reaction rates of ozone production and loss at equinox and summer solstice. Furthermore GROMOS-C proved capable of measuring the tertiary ozone layer above Ny-Ålesund in winter.
Highlights
Ozone is a molecule which plays an important role in the Earth’s atmosphere
The ozone time series used for this study were measured by the two ground-based microwave radiometers GROMOS-C and OZORAM which are located at Ny-Ålesund, Svalbard (79◦ N, 12◦ E), in the Arctic
In this study we analysed the diurnal cycle for different insolation conditions from polar night to polar day and at different altitudes in the stratosphere and mesosphere
Summary
Ozone is a molecule which plays an important role in the Earth’s atmosphere. It protects the biosphere from harmful UV radiation and controls the thermal structure of the stratosphere. Observations from ground-based ozone radiometers from the Network for the Detection of Atmospheric Composition Change (NDACC) were used to study the diurnal cycle in the stratosphere. (Parrish et al, 2014) used 19 years of observations by a ground-based microwave radiometer at the Mauna Loa Observatory, Hawaii, to analyse the diurnal cycle Both studies confirm the afternoon enhancement of ozone in the stratosphere. The ozone time series used for this study were measured by the two ground-based microwave radiometers GROMOS-C and OZORAM which are located at Ny-Ålesund, Svalbard (79◦ N, 12◦ E), in the Arctic. It is a comprehensive data set of Arctic, middle-atmospheric ozone with a high time resolution. The subsequent ozone loss in spring was, terminated in early March by sudden stratospheric final warming (Manney and Lawrence, 2016)
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