Andrew Klekociuk

Andrew Klekociuk
Australian Antarctic Division · Antarctica and the Global System

BSc(Hons) PhD

About

141
Publications
12,287
Reads
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1,827
Citations
Additional affiliations
May 1987 - December 2015
Australian Antarctic Division
Position
  • Senior Researcher

Publications

Publications (141)
Article
Full-text available
In the paper the seasonal trends in the zonal asymmetry in the quasi-stationary wave pattern of total ozone column (TOC) at southern polar latitudes have been investigated. We evaluated and compared seasonal trends in the zonal TOC asymmetry from modern era satellite measurements using the Total Ozone Mapping Spectrometer data and the second Chemis...
Article
Full-text available
The 11-year solar activity cycle in the vertical ozone distribution over the Antarctic station Faraday/Vernadsky in the Antarctic Peninsula region (65.25° S, 64.27° W) was analyzed using the Solar Backscatter Ultra Violet (SBUV) radiometer data Version 8.6 Merged Ozone Data Sets (MOD) over the 40-year period 1979-2018. The SBUV MOD ozone profiles a...
Presentation
Full-text available
Zonal average monthly Solar Backscatter Ultraviolet Radiometer (SBUV) satellite data have been used to study the vertical ozone distribution in 1979–2018. The quasi-11-year period solar activity cycle from the ozone data series was investigated with the wavelet transform. Solar activity was characterized by sunspot numbers and F10.7 solar radio flu...
Presentation
Full-text available
Monthly mean data from the MERRA-2 reanalysis and CMIP6 model have been examined for austral spring months (September, October, November) over the 1980–2014 period. Analysis was made for 2D (total ozone column) and 3D (ozone partial pressure) climatological mean (1980-2014) values for the zonal band (0º – 90º S) at pressure levels (1000–0.1 hPa) fo...
Preprint
The level of quasi-stationary planetary wave (QSW) activity in the Antarctic winter stratosphere provides insights into the likely behavior of the ozone hole in the following spring months. Observation of an anomalously large amplitude of the QSW in winter stratospheric temperatures is an indicator that strong disturbances to the polar vortex are l...
Preprint
Full-text available
The level of quasi-stationary planetary wave (QSW) activity in the Antarctic winter stratosphere provides insights into the likely behavior of the ozone hole in the following spring months. Observation of an anomalously large amplitude of the QSW in winter stratospheric temperatures is an indicator that strong disturbances to the polar vortex are l...
Article
Full-text available
Hydroxyl radical (OH) plays critical roles within the troposphere, such as determining the lifetime of methane (CH4), yet is challenging to model due to its fast cycling and dependence on a multitude of sources and sinks. As a result, the reasons for variations in OH and the resulting CH4 lifetime (τCH4), both between models and in time, are diffic...
Article
Full-text available
The impact of a major sudden stratospheric warming (SSW) in the Arctic in February 2018 on the midlatitude mesosphere is investigated by performing the microwave radiometer measurements of carbon monoxide (CO) and zonal wind above Kharkiv, Ukraine (50.0∘ N, 36.3∘ E). The mesospheric peculiarities of this SSW event were observed using a recently des...
Article
Full-text available
The description of the data used for analysis, CO movements in stratosphere and mesosphere, and vertical profiles of the MLS temperature anomalies are presented in the Supplement. The Aura MLS CO values have been taken from version 4.2x Aura MLS Level 2 data https://mls.jpl.nasa.gov/data/readers.php). Aura MLS v4.2x data have 37 pressure levels. Th...
Article
Full-text available
The impact of a major sudden stratospheric warming (SSW) in the Arctic in February 2018 on the mid-latitude mesosphere was investigated by performing microwave radiometer measurements of carbon monoxide (CO) and zonal wind above Kharkiv, Ukraine (50.0° N, 36.3° E). The mesospheric peculiarities of this SSW event were observed using recently designe...
Article
The near-surface environment of the Southern Ocean is subject to particular biases in weather and climate simulations, particularly during the summer season, and relatively few analyses of cloud and radiation properties have been reported for the region. Here we provide an analysis of ship-based measurements of downwelling radiation, cloud fraction...
Article
Full-text available
Major mid-winter stratospheric sudden warmings (SSWs) are the largest instance of wintertime variability in the Arctic stratosphere. Because SSWs are able to cause significant surface weather anomalies on intra-seasonal timescales, several previous studies have focused on their potential future change, as might be induced by anthropogenic forcings....
Article
Full-text available
Major mid-winter stratospheric sudden warmings (SSWs) are the largest instance of wintertime variability in the Arctic stratosphere. Because SSWs are able to cause significant surface weather anomalies on intra-seasonal timescales, several previous studies have focused on their potential future change, as might be induced by anthropogenic forcings....
Conference Paper
Full-text available
The asymmetry in the Antarctic total ozone zonal distribution has changed during the last four decades, showing an eastward shift in the zonal ozone minimum of quasi-stationary planetary wave. The satellite data 1979-2016 analyzed by the authors related to changes in the zonal asymmetry of the Antarctic ozone and to their coupling with atmospheric...
Conference Paper
Full-text available
Ozone is an important component of the Earth's atmosphere that effectively absorbs dangerous solar UV radiation in 200–320 nm wavelengths. The largest amount of ozone (≈ 90 %) is located in the stratosphere at altitudes 25–30 km in tropical regions and 15–20 km in the polar regions. The amount of ozone in the atmosphere varies throughout the year a...
Article
Full-text available
Major mid-winter stratospheric sudden warmings (SSWs) are the largest instance of wintertime variability in the Arctic stratosphere. Because SSWs are able to cause significant surface weather anomalies on intra-seasonal time scales, several previous studies have focused on their potential future change, as might be induced by anthropogenic forcings...
Article
The Southern Hemisphere Antarctic stratosphere experienced two noteworthy events in 2015: a significant injection of sulfur from the Calbuco volcanic eruption in Chile in April and a record-large Antarctic ozone hole in October and November. Here we quantify Calbuco's influence on stratospheric ozone depletion in austral spring 2015 using observati...
Article
Full-text available
The Southern Hemisphere Antarctic stratosphere experienced two noteworthy events in 2015: a significant injection of sulfur from the Calbuco volcanic eruption in Chile in April and a record-large Antarctic ozone hole in October and November. Here we quantify Calbuco's influence on stratospheric ozone depletion in austral spring 2015 using observati...
Article
Full-text available
Stratosphere-to-troposphere transport (STT) provides an important natural source of ozone to the upper troposphere, but the characteristics of STT events in the Southern Hemisphere extratropics and their contribution to the regional tropospheric ozone budget remain poorly constrained. Here, we develop a quantitative method to identify STT events fr...
Article
Full-text available
Satellite observations demonstrate Antarctic sea ice extent increased between late-1978 and 2015, with significant spatial and seasonal variability. Late spring retreat off George V Land is a major component of the observed increase, but the paucity of proxy records makes interpretation of trends (and impacts) challenging. Here Earth-system modelli...
Article
Full-text available
We consider 5 years of spectrometer measurements of OH(6–2) and O2(0–1) airglow emission intensities and temperatures made near Adelaide, Australia (35° S, 138° E), between September 2001 and August 2006 and compare them with measurements of the same parameters from at the same site using an airglow imager, with the intensities of the OH(8–3) and O...
Article
Full-text available
The quasi-stationary pattern of the Antarctic total ozone has changed during the last 4 decades, showing an eastward shift in the zonal ozone minimum. In this work, the association between the longitudinal shift of the zonal ozone minimum and changes in meteorological fields in austral spring (September–November) for 1979–2014 is analyzed using ERA...
Article
Full-text available
Stratosphere-to-troposphere transport (STT) provides an important natural source of ozone to the upper troposphere, but the characteristics of STT events in the southern hemisphere extratropics and their contribution to the regional tropospheric ozone budget remain poorly constrained. Here, we develop a quantitative method to identify STT events fr...
Article
Full-text available
The quasi-stationary pattern of the Antarctic total ozone has changed during the last four decades, demonstrating an eastward shift in the zonal ozone minimum. In this work, the association between the longitudinal shift of the zonal ozone minimum and changes in meteorological fields in austral spring (September–November) for 1979–2014 is analyzed....
Conference Paper
This paper presents an overview of work undertaken over a number of Australian Antarctic Science projects, beginning in season 2001/02 with a shallow snow pit. In season 2005/06 this was augmented with a 260 m thermally drilled ice core and a 4.5 m snow pit. A core taken in 2008/09 overlapped the 2005/06 core and pit samples. From 2009/10, short co...
Article
Full-text available
Chemistry–climate models are important tools for addressing interactions of composition and climate in the Earth system. In particular, they are used to assess the combined roles of greenhouse gases and ozone in Southern Hemisphere climate and weather. Here we present an evaluation of the Australian Community Climate and Earth System Simulator – ch...
Article
Full-text available
Better characterisation of aerosol processes in pristine, natural environments, such as Antarctica, have recently been shown to lead to the largest reduction in uncertainties in our understanding of radiative forcing. Our understanding of aerosols in the Antarctic region is currently based on measurements that are often limited to boundary layer ai...
Article
Full-text available
The DEEPWAVE experiment was designed to quantify gravity wave (GW) dynamics and effects from orographic and other sources to regions of dissipation at high altitudes. The core DEEPWAVE field phase took place from May through July 2014 using a comprehensive suite of airborne and ground-based instruments providing measurements from Earth’s surface to...
Article
Full-text available
Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid-latitudes to high latitudes of the Southern Hemisphere (SH), which over the last few decades have experienced extreme and regionally variable trends in precipita...
Article
Full-text available
We review the 2013 Antarctic ozone hole, making use of various ground-based, in-situ and remotely-sensed ozone measurements, ground-based measurements of ultraviolet radiation and meteorological reanalyses. Based on analysis of 34 years of satellite records spanning 1979-2013 (which excludes 1995), we find that in terms of maximum area, minimum ozo...
Article
Full-text available
Southern hemisphere circulation patterns and associated anomalies for the aus-tral spring 2014 are reviewed, with emphasis given to the Pacific Basin climate indicators and Australian rainfall and temperature patterns. Equatorial sea-surface temperatures in the Pacific warmed through the season, and the South-ern Oscillation just exceeded El Niño t...
Article
Full-text available
Aerosol observations above the Southern Ocean and Antarctic sea ice are scarce. Measurements of aerosols and atmospheric composition were made in East Antarctic pack ice on-board the Australian icebreaker Aurora Australis during the spring of 2012. One particle formation event was observed during the 32 days of observations. This event occurred on...
Article
Full-text available
The effect of aerosols on clouds and their radiative properties is one of the largest uncertainties in our understanding of radiative forcing. A recent study has concluded that better characterisation of pristine, natural aerosol processes leads to the largest reduction in these uncertainties. Antarctica, being far from anthropogenic activities, is...
Article
Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid-to high-latitudes of the Southern Hemisphere (SH) which over the last few decades has experienced extreme and regional variable trends in precipitation, ocean ci...
Article
Chemistry climate models are important tools for addressing interactions of composition and climate in the Earth System. In particular, they are used for assessing the combined roles of greenhouse gases and ozone in Southern Hemisphere climate and weather. Here we present an evaluation of the Australian Community Climate and Earth System Simulator-...
Article
Full-text available
The Deep Propagating Gravity Wave Experiment (DEEPWAVE) was designed to quantify gravity wave (GW) dynamics and effects from orographic and other sources to regions of dissipation at high altitudes. The core DEEPWAVE field phase took place from May through July 2014 using a comprehensive suite of airborne and ground-based instruments providing meas...
Article
Full-text available
Aerosol observations above the Southern Ocean and Antarctic sea ice are scarce. Measurements of aerosols and atmospheric composition were made in East Antarctic pack ice on-board the Australian icebreaker Aurora Australis during the spring of 2012. One particle formation event was observed during the 32 days of observations. This event occurred on...
Article
Near-synchronized in situ, space-borne (A-Train) and ground-based lidar observations are employed to evaluate the boundary-layer clouds (BLCs) over Tasmania and the adjacent Southern Ocean (SO) simulated by the limited-area version of Australian Community Climate and Earth System Simulator (ACCESS-C). Two winter cases featuring BLCs associated with...
Conference Paper
The Antarctic region is a pristine environment with minimal anthropogenic influence. Aerosol measurements in this environment allow the study of natural aerosols and polar atmospheric dynamics. Measurements in this region have been limited primarily to continental and coastal locations where permanent stations exist, with a handful of measurements...
Article
Radiosonde observations made from Davis station, Antarctica (68.6°S, 78.0°4 E) between 2001 and 2012 are used to compile a climatology of lower stratosphere inertial gravity wave characteristics. Wavelet analysis extracts single wave packets from the wind and temperature perturbations. Wavelet parameters, combined with linear gravity wave theory, a...
Conference Paper
Aerosol measurements in this pristine Antarctic environment allow the study of natural aerosols and polar atmospheric dynamics. Measurements in this region have been limited primarily to continental and coastal locations where permanent stations exist, with only one other measurement campaign passing through the sea ice region. The MAPS campaign (M...
Conference Paper
Full-text available
Significant ozone depletion was observed within the southern polar vortex during spring in the 1980s – early 1990s. Later, a stabilization in total ozone levels and ozone hole area has been observed. atmosphere models predict a consequent recovery of the Antarctic ozone. Nevertheless, identification of the long-term processes is complicated by high...
Conference Paper
The contribution of Antarctic aerosol formation to the Southern Hemisphere aerosol load, and consequently their impact on the Earth’s albedo, climate and chemistry, is currently unknown. In the Antarctic region, aerosol measurements have been limited primarily to boundary layer air-masses at spatially sparse coastal and continental research station...
Article
The Australian Bureau of Meteorology maintains a number of long-running Dobson measurement programs, among the few in southern hemisphere mid-latitudes. Data from the Melbourne site (the Melbourne/Airport World Ozone and Ultraviolet Radiation Data Centre (WOUDC) station was originally located at Aspendale, then moved to the city centre, and finally...
Conference Paper
The Antarctic region is a pristine environment without any significant anthropogenic influence. Measurements of aerosols in this environment therefore allow the study of natural aerosol properties and formation mechanisms in polar conditions, and also allow insight into polar atmospheric dynamics. Measurements in this region have been limited prima...
Article
[1] The proportion of polar stratospheric clouds due to orographic gravity wave (OGW) forcing is quantified during four Antarctic (2007–2010) and four Arctic (2006/2007 to 2009/2010) winter seasons. OGW‒active days are defined as those days above major polar mountain ranges which have wave‒ice polar stratospheric clouds (PSCs), tropospheric wind co...
Article
Full-text available
Atmospheric, oceanic and sea ice conditions in the southern hemisphere are reviewed for the austral spring of 2012, with emphasis given to the Pacific basin climate indicators and Australian rainfall and temperature patterns. The Pacific basin saw a return to neutral ENSO conditions, with slightly warmer than normal equatorial SSTs just east of the...
Conference Paper
We report measurements with the mobile IAP Fe-LIDAR and the AAD MST radar at the Australian Antarctic Station Davis (69°S) between December 2010 and December 2012. The dataset includes more than 2900 hours of LIDAR measurements with a temporal resolution of 2 minutes equally distributed throughout the year and local time. The measurements give a go...
Conference Paper
The pristine environment of the Antarctic allows the study of natural aerosol properties and formation mechanisms in polar conditions, with minor anthropogenic influence reaching the remote continent. Studies of aerosols over Antarctic sea ice have not been made, with measurement campaigns being confined primarily to permanent stations on continent...
Conference Paper
Full-text available
The Global Atmosphere Watch of WMO includes several stations in Antarctica that keep a close eye on the ozone layer during the ozone hole season. Observations made during the ozone holes from 2003 to 2012 will be compared to each other and interpreted in light of the meteorological conditions. Satellite observations will be used to get a more gener...
Article
During August 2011 stratospheric ozone over much of Southern Australia dropped to very low levels (~265 DU) for over a week above major population centers. The weather during this low ozone period was mostly clear and sunny, resulting in measured solar ultraviolet radiation (UVR) levels up to 40% higher than normal, with UV Index > 3 despite being...
Article
Full-text available
Chemistry-Climate Model Validation phase 2 (CCMVal-2) model simulations are used to analyze Antarctic ozone increases in 2000-2100 during local spring and early summer, both vertically integrated and at several pressure levels in the lower stratosphere. Multi-model median trends of monthly zonal mean total ozone column (TOC), ozone volume mixing ra...
Conference Paper
Measurements of a number of atmospheric components will be undertaken over 1 year-old sea ice off East Antarctica as part of the Sea Ice Physics EXperiment (SIPEX II) during September and October 2012. SIPEX II is an integrated and multi-disciplinary study of physical and ecological sea ice processes on small to regional scales which aims to enhanc...
Preprint
Full-text available
Seasonal trends in the quasi-stationary wave pattern of total column ozone at southern polar latitudes are evaluated from modern era satellite measurements and are compared with results from the second Chemistry-Climate Model Validation (CCMVal-2) assessment.