The Atmospheric Chemistry Experiment`– Fourier Transform Spectrometer (ACE-FTS) is a high spectral resolution spectrometer on the SciSat satellite that has been taking solar occultation measurements of the Earth’s limb since February 2004. ACE-FTS measures vertical profiles of temperature/pressure and concentrations of over 60 trace gases, including ozone and water vapour, with a vertical...
Both satellite observations and model simulations have shown ozone recovery since late 1990s. It is less certain for ozone in the mid-latitude lower stratosphere, where merged satellite observations suggest small decreases for 2000-2020, while Chemistry Climate Models (CCMs) suggest small increases (WMO, 2022). The differences could result from uncertainties in merged satellite data sets...
Uncertainties in observations often considerably limit our ability to assess long-term changes in the vertical distribution of water vapour. ESA's Climate Change Initiative (CCI) was set up to address the difficulties in harmonizing and merging climate data records (CDRs) of key climate variables and to provide climate modellers and researchers with high-quality, stable, long-term time series...
We present the calculation of ozone trends from various versions of combined satellite records SAGE II, MIPAS and OMPS NASA, which spans the period from 1979 to 2022. The merging is performed using different transfer standards: satellite records of ACE-FTS and MLS, and model runs EMAC, CMAM and WACCM. The impact of transfer standard on corresponding trends is investigated.
Nitrogen dioxide (NO2) has absorption lines in UV and VIS spectral windows and can interfere with the ozone retrievals derived from Ozone Mapping and Profiling Suite Limb Profiler (OMPS-LP). To correct for this effect, we constructed NO2 climatology using simulated NO2 profiles with the GMI GEOS CCM model by averaging model data over 6 years. This climatology provides vertical NO2 profiles as...
NOAA’s goal of understanding climate change is supported by operations of satellite and ground-based ozone observations that allow monitoring of atmospheric composition variability and long-term changes in the stratosphere and troposphere. Both satellite and ground-based (GB) observations are needed to track stratospheric ozone recovery and to evaluate the atmospheric radiative budget. Both GB...
Large-scale meteorologic events (e.g. cyclones), referred to as synoptic events, strongly influence weather predictability, but still cannot be fully characterized in the Arctic region because of the sparse coverage of measurements. Due to the fact that dynamics in the lower stratosphere and troposphere influences the ozone field, an approach to further analyze these events would be the use of...
Rising greenhouse gas emissions are changing the circulation in the stratosphere and subsequently altering the stratospheric composition. The result is that trace gas trends from the past two decades show a hemispheric asymmetry, with trends in each hemisphere having opposite signs. Here we discuss trends in observations from the limb instruments ACE-FTS and OSIRIS, as well as trends in model...
We present trace gas and aerosol measurements obtained by the airborne infrared imaging limb sounder GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) that has been operated onboard the research aircraft Geophysica within the Asian Monsoon during the StratoClim campaign (July 2017) and onboard HALO (High Altitude and Long Range Research Aircraft) above the South Atlantic...
The Stratospheric Aerosol and Gas Experiment III has routinely observed the upper atmosphere from the International Space Station (SAGE III/ISS) since June 2017. An important greenhouse gas and molecule affecting chemistry cycles, water vapor is among the vertical profiles of trace gases measured by SAGE III/ISS. This makes SAGE III/ISS the youngest of the current fleet of space-based...