Patrick Cullis
YOU?
Author Swipe
View article: Tropical tropospheric ozone trends (1998 to 2023): new perspectives from SHADOZ, IAGOS and OMI/MLS observations
Tropical tropospheric ozone trends (1998 to 2023): new perspectives from SHADOZ, IAGOS and OMI/MLS observations Open
Tropospheric ozone trends are important indicators of climate forcing and surface pollution, yet relevant satellite observations are too uncertain for assessments. The assessment project TOAR-II has used multi-instrument, ground-based data…
View article: An Unusual Winter Ozone Event in Colorado
An Unusual Winter Ozone Event in Colorado Open
Surface ozone (O 3 ) mixing ratios exceeding the National Ambient Air Quality Standard were measured at rural monitors along the Colorado Front Range on 17 April 2020 during the COVID‐19 lockdown. This unusual episode followed back‐to‐back…
View article: Stratospheric Aerosol layer responses to volcanic and wildfire perturbations
Stratospheric Aerosol layer responses to volcanic and wildfire perturbations Open
The stratospheric aerosol layer plays a critical role in the climate system and is often disrupted by natural phenomena such as volcanic eruptions and extreme wildfire events. These perturbations differ significantly in their injection mag…
View article: Ozone trends in homogenized Umkehr, ozonesonde, and COH overpass records
Ozone trends in homogenized Umkehr, ozonesonde, and COH overpass records Open
This study presents an updated evaluation of stratospheric ozone profile trends at Arosa/Davos/Hohenpeißenberg, Switzerland/Germany; Observatory de Haute-Provence (OHP), France; Boulder, Colorado, Mauna Loa Observatory (MLO) and Hilo, Hawa…
View article: Balloon Baseline Stratospheric Aerosol Profiles (B<sup>2</sup>SAP)—Perturbations in the Southern Hemisphere, 2019–2022
Balloon Baseline Stratospheric Aerosol Profiles (B<sup>2</sup>SAP)—Perturbations in the Southern Hemisphere, 2019–2022 Open
Volcanic and pyrocumulonimbus (pyroCB) injections into the stratosphere perturb the aerosol layer and can have important radiative and chemical impacts on timescales spanning from months to several years. Repeated in situ balloon‐borne mea…
View article: An Unusual Winter Ozone Event in Colorado
An Unusual Winter Ozone Event in Colorado Open
Surface ozone (O3) mixing ratios exceeding the National Ambient Air Quality Standard (NAAQS) were measured at rural monitors along the Colorado Front Range on 17 April 2020 during the COVID-19 lockdown. This unusual episode followed back-t…
View article: Ozone trends in homogenized Umkehr, Ozonesonde, and COH overpass records
Ozone trends in homogenized Umkehr, Ozonesonde, and COH overpass records Open
This study presents an updated evaluation of stratospheric ozone profile trends at Arosa/Davos/Hohenpeißenberg, Switzerland/Germany, Observatory de Haute Provence (OHP), France, Boulder, Colorado, Mauna Loa Observatory (MLO) and Hilo, Hawa…
View article: Dynamical drivers of free-tropospheric ozone increases over equatorial Southeast Asia
Dynamical drivers of free-tropospheric ozone increases over equatorial Southeast Asia Open
Positive trends in tropical free-tropospheric (FT) ozone are frequently ascribed to emissions growth, but less is known about the effects of changing dynamics. Extending a prior study (Thompson et al., 2021; https://doi.org/10.1029/2021JD0…
View article: Dynamical drivers of free-tropospheric ozone increases over equatorial Southeast Asia
Dynamical drivers of free-tropospheric ozone increases over equatorial Southeast Asia Open
Positive trends in tropical free-tropospheric (FT) ozone are frequently ascribed to emissions growth, but less is known about the effects of changing dynamics. Extending a prior study (Thompson et al., 2021; https://doi.org/10.1029/2021JD0…
View article: Total ozone variability and trends over the South Pole during the wintertime
Total ozone variability and trends over the South Pole during the wintertime Open
The Antarctic polar vortex creates unique chemical and dynamical conditions when the stratospheric air over Antarctica is isolated from the rest of the stratosphere. As a result, stratospheric ozone within the vortex remains largely unchan…
View article: Comment on egusphere-2023-773
Comment on egusphere-2023-773 Open
Abstract. The Antarctic polar vortex creates unique chemical and dynamical conditions when the stratospheric air over Antarctica is isolated from the rest of the stratosphere. As a result, stratospheric ozone within the vortex remains larg…
View article: Baseline Balloon Stratospheric Aerosol Profiles (B<sup>2</sup>SAP)—Systematic Measurements of Aerosol Number Density and Size
Baseline Balloon Stratospheric Aerosol Profiles (B<sup>2</sup>SAP)—Systematic Measurements of Aerosol Number Density and Size Open
Stratospheric aerosol plays an important role in Earth's radiative balance. Systematic measurements of stratospheric aerosol number concentration and size are needed to characterize their baseline values and variability, improve understand…
View article: Total ozone variability and trends over the South Pole during the wintertime
Total ozone variability and trends over the South Pole during the wintertime Open
The Antarctic polar vortex creates unique chemical and dynamical conditions when the stratospheric air over Antarctica is isolated from the rest of the stratosphere. As a result, stratospheric ozone within the vortex remains largely unchan…
View article: South Pole Station ozonesondes: variability and trends in the springtime Antarctic ozone hole 1986–2021
South Pole Station ozonesondes: variability and trends in the springtime Antarctic ozone hole 1986–2021 Open
Balloon-borne ozonesondes launched weekly from South Pole Station (1986–2021) measure high-vertical-resolution profiles of ozone and temperature from the surface to 30–35 km altitude. The launch frequency is increased in late winter before…
View article: Comment on acp-2022-689
Comment on acp-2022-689 Open
Abstract. Balloon-borne ozonesondes launched weekly from South Pole station (1986–2021) measure high vertical resolution profiles of ozone and temperature from surface to 30–35 km altitude. The launch frequency is increased in late winter …
View article: South Pole Station ozonesondes: variability and trends in the springtime Antarctic ozone hole 1986–2021
South Pole Station ozonesondes: variability and trends in the springtime Antarctic ozone hole 1986–2021 Open
Balloon-borne ozonesondes launched weekly from South Pole station (1986–2021) measure high vertical resolution profiles of ozone and temperature from surface to 30–35 km altitude. The launch frequency is increased in late winter before the…
View article: An Examination of the Recent Stability of Ozonesonde Global Network Data
An Examination of the Recent Stability of Ozonesonde Global Network Data Open
The recent Assessment of Standard Operating Procedures for Ozonesondes 2.0 (WMO/GAW Report #268) addressed questions of homogeneity and long‐term stability in global electrochemical concentration cell (ECC) ozone sounding network time seri…
View article: An Examination of the Recent Stability of Ozonesonde Global Network Data
An Examination of the Recent Stability of Ozonesonde Global Network Data Open
The recent Assessment of Standard Operating Procedures for Ozonesondes 2.0 (WMO/GAW Report #268) addressed questions of homogeneity and long-term stability in global electrochemical concentration cell (ECC) ozone sounding network time seri…
View article: The <i>Fires, Asian, and Stratospheric Transport</i> –Las Vegas Ozone Study ( <i>FAST</i> -LVOS)
The <i>Fires, Asian, and Stratospheric Transport</i> –Las Vegas Ozone Study ( <i>FAST</i> -LVOS) Open
The Fires, Asian, and Stratospheric Transport–Las Vegas Ozone Study (FAST-LVOS) was conducted in May and June of 2017 to study the transport of ozone (O3) to Clark County, Nevada, a marginal non-attainment area in the southwestern United S…
View article: TROPOMI tropospheric ozone column data: geophysical assessment and comparison to ozonesondes, GOME-2B and OMI
TROPOMI tropospheric ozone column data: geophysical assessment and comparison to ozonesondes, GOME-2B and OMI Open
Ozone in the troposphere affects humans and ecosystems as a pollutant and as a greenhouse gas. Observing, understanding and modelling this dual role, as well as monitoring effects of international regulations on air quality and climate cha…
View article: Comment on acp-2021-690
Comment on acp-2021-690 Open
Abstract. The Fires, Asian, and Stratospheric TransportâLas Vegas Ozone Study (FAST-LVOS) was conducted in May and June of 2017 to study the transport of ozone (O3) to Clark County, Nevada, a marginal non-attainment area in the southwest…
View article: The Fires, Asian, and Stratospheric Transport-Las Vegas Ozone Study (FAST-LVOS)
The Fires, Asian, and Stratospheric Transport-Las Vegas Ozone Study (FAST-LVOS) Open
The Fires, Asian, and Stratospheric Transport-Las Vegas Ozone Study (FAST-LVOS) was conducted in May and June of 2017 to study the transport of ozone (O3) to Clark County, Nevada, a marginal non-attainment area in the Southwestern U.S. (SW…
View article: ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2
ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2 Open
This dataset provides information on greenhouse gases and human-produced air pollution, including atmospheric concentrations of carbon dioxide (CO2), methane (CH4), tropospheric ozone (O3), and black carbon (BC) aerosols, collected during …
View article: Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) Newly Released V5.2 Validation of Ozone and Water Vapor Data
Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) Newly Released V5.2 Validation of Ozone and Water Vapor Data Open
<p>The Stratospheric Aerosol and Gas Experiment III (SAGE III) instrument installed on the International Space Station (ISS) has completed over three and a half years of data collection and production of science data products. The SA…
View article: COVID‐19 Crisis Reduces Free Tropospheric Ozone Across the Northern Hemisphere
COVID‐19 Crisis Reduces Free Tropospheric Ozone Across the Northern Hemisphere Open
Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low ozone in the free troposphere. From April to August, and from 1 to 8 kilometers altitude, ozone was on average 7% (≈4 nmol/mol) below the…
View article: Did the COVID-19 Crisis Reduce Free Tropospheric Ozone across the Northern Hemisphere?
Did the COVID-19 Crisis Reduce Free Tropospheric Ozone across the Northern Hemisphere? Open
Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low ozone in the free troposphere. From April to August, and from 1 to 8 kilometers altitude, ozone was on average 7% (~4 ppbv) below the 200…
View article: Characterizing sources of high surface ozone events in the southwestern US with intensive field measurements and two global models
Characterizing sources of high surface ozone events in the southwestern US with intensive field measurements and two global models Open
The detection and attribution of high background ozone (O3) events in the southwestern US is challenging but relevant to the effective implementation of the lowered National Ambient Air Quality Standard (NAAQS; 70 ppbv). Here we leverage i…