J. C. Witte
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View article: Data Lifecycle Management for Field Campaigns: Welcome to the Earth Observing Laboratory Field Catalog and Archive
Data Lifecycle Management for Field Campaigns: Welcome to the Earth Observing Laboratory Field Catalog and Archive Open
The NSF NCAR Earth Observing Laboratory (EOL) has supported over 600 national and international field campaigns which represent half a century of field-based observational science. Our mission is to provide responsive, high quality data se…
View article: Cold Fog Amongst Complex Terrain
Cold Fog Amongst Complex Terrain Open
Cold fog forms via various thermodynamic, dynamic, and microphysical processes when the air temperature is less than 0°C. It occurs frequently during the cold season in the western United States yet is challenging to detect using standard …
View article: Cause of a Lower‐Tropospheric High‐Ozone Layer in Spring Over Hanoi
Cause of a Lower‐Tropospheric High‐Ozone Layer in Spring Over Hanoi Open
The ozonesonde observations in Hanoi, Vietnam, over 14 years since 2004, have confirmed an enhancement in lower tropospheric ozone concentration at about 3 km altitude in the spring season. We investigated the evolution of the ozone enhanc…
View article: Cause of a lower-tropospheric high-ozone layer in spring over Hanoi
Cause of a lower-tropospheric high-ozone layer in spring over Hanoi Open
The ozonesonde observations in Hanoi, Vietnam, over 14 years since 2004, have confirmed an enhancement in lower tropospheric ozone concentration at about 3 km altitude in the spring season. We investigated the evolution of the ozone enhanc…
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: Regional and Seasonal Trends in Tropical Ozone From SHADOZ Profiles: Reference for Models and Satellite Products
Regional and Seasonal Trends in Tropical Ozone From SHADOZ Profiles: Reference for Models and Satellite Products Open
Understanding lowermost stratosphere (LMS) ozone variability is an important topic in the trends and climate assessment communities because of feedbacks among changing temperature, dynamics, and ozone. LMS evaluations are usually based on …
View article: Formation of a lower-tropospheric high-ozone layer in spring over Southeast Asia
Formation of a lower-tropospheric high-ozone layer in spring over Southeast Asia Open
The ozonesonde observations in Hanoi, Vietnam, over fourteen years since 2004 have confirmed the enhancement in lower tropospheric ozone concentration at about 3 km altitude in the spring season. We investigated the evolution of the ozone …
View article: Regional and Seasonal Trends in Tropical Ozone from SHADOZ Profiles: Reference for Models and Satellite Products
Regional and Seasonal Trends in Tropical Ozone from SHADOZ Profiles: Reference for Models and Satellite Products Open
Understanding lowermost stratosphere (LMS) ozone variability is an important topic in the trends and climate assessment communities because of feedbacks among changing temperature, dynamics and ozone. LMS evaluations are usually based on s…
View article: High-resolution in situ observations of atmospheric thermodynamics using dropsondes during the Organization of Tropical East Pacific Convection (OTREC) field campaign
High-resolution in situ observations of atmospheric thermodynamics using dropsondes during the Organization of Tropical East Pacific Convection (OTREC) field campaign Open
The Organization of Tropical East Pacific Convection (OTREC) field campaign investigated the dynamical structure of convection in the tropical east Pacific and Caribbean. One of the central data sets for this field campaign is the thermody…
View article: Improving ECC Ozonesonde Data Quality: Assessment of Current Methods and Outstanding Issues
Improving ECC Ozonesonde Data Quality: Assessment of Current Methods and Outstanding Issues Open
We review the current state of knowledge of ozonesonde uncertainty and bias, with reference to recent developments in laboratory and field experiments. In the past 20 years ozonesonde precision has improved by a factor of 2, primarily thro…
View article: High-resolution in situ observations of atmospheric thermodynamicsusing dropsondes during the Organization of Tropical East PacificConvection (OTREC) field campaign
High-resolution in situ observations of atmospheric thermodynamicsusing dropsondes during the Organization of Tropical East PacificConvection (OTREC) field campaign Open
The Organization of Tropical East Pacific Convection (OTREC) field campaign investigated the dynamical structure of convection in the tropical east Pacific and Caribbean. One of central data sets for this field campaign is the thermodynami…
View article: A new method to correct the electrochemical concentration cell (ECC) ozonesonde time response and its implications for “background current” and pump efficiency
A new method to correct the electrochemical concentration cell (ECC) ozonesonde time response and its implications for “background current” and pump efficiency Open
The electrochemical concentration cell (ECC) ozonesonde has been the main instrument for in situ profiling of ozone worldwide; yet, some details of its operation, which contribute to the ozone uncertainty budget, are not well understood. H…
View article: Global-scale distribution of ozone in the remote troposphere from the ATom and HIPPO airborne field missions
Global-scale distribution of ozone in the remote troposphere from the ATom and HIPPO airborne field missions Open
Ozone is a key constituent of the troposphere, where it drives photochemical processes, impacts air quality, and acts as a climate forcer. Large-scale in situ observations of ozone commensurate with the grid resolution of current Earth sys…
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: The Role of Convection in Tropical Ozone Trends (1998-2018) Based on SHADOZ Profiles
The Role of Convection in Tropical Ozone Trends (1998-2018) Based on SHADOZ Profiles Open
Quantifying variability in the lowermost stratosphere (LMS) is important because of feedbacks among changing temperature, dynamics and species like ozone. We used reprocessed Southern Hemisphere Additional Ozonesondes data from 1998-2018 i…
View article: A Post‐2013 Dropoff in Total Ozone at a Third of Global Ozonesonde Stations: Electrochemical Concentration Cell Instrument Artifacts?
A Post‐2013 Dropoff in Total Ozone at a Third of Global Ozonesonde Stations: Electrochemical Concentration Cell Instrument Artifacts? Open
An international effort to improve ozonesonde data quality and to reevaluate historical records has made significant improvements in the accuracy of global network data. However, between 2014 and 2016, ozonesonde total column ozone (TCO; O…
View article: A Post-2013 Drop-off in Total Ozone at a Third of Global Ozonesonde Stations: ECC Instrument Artifacts?
A Post-2013 Drop-off in Total Ozone at a Third of Global Ozonesonde Stations: ECC Instrument Artifacts? Open
An international effort to improve ozonesonde data quality and to reevaluate historical records has made significant improvements in the accuracy of global network data. However, between 2014 and 2016, ozonesonde total column ozone (TCO; O…
View article: Global-scale distribution of ozone in the remote troposphere from ATom and HIPPO airborne field missions
Global-scale distribution of ozone in the remote troposphere from ATom and HIPPO airborne field missions Open
Ozone is a key constituent of the troposphere where it drives photochemical processes, impacts air quality, and acts as a climate forcer. Large-scale in situ observations of ozone commensurate with the grid resolution of current Earth syst…
View article: A new method to correct the ECC ozone sonde time response and its implications for “background current” and pump efficiency
A new method to correct the ECC ozone sonde time response and its implications for “background current” and pump efficiency Open
The Electrochemical Concentration Cell (ECC) ozonesonde has been the main instrument for in situ profiling of ozone worldwide; yet, some details of its operation, which contribute to the ozone uncertainty budget, are not well understood. H…
View article: A Post-2013 Drop-off in Total Ozone at a Third of Global Ozonesonde Stations: ECC Instrument Artifacts?
A Post-2013 Drop-off in Total Ozone at a Third of Global Ozonesonde Stations: ECC Instrument Artifacts? Open
Earth and Space Science Open Archive This work has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary. Learn mor…
View article: A Post-2013 Drop-off in Total Ozone at Half of Global Ozonesonde Stations: ECC Instrument Artifacts?
A Post-2013 Drop-off in Total Ozone at Half of Global Ozonesonde Stations: ECC Instrument Artifacts? Open
An international effort to improve ozonesonde data quality and to reevaluate historical records has made significant improvements in the accuracy of global network data. However, during 2013-2016, ozonesonde total column ozone (TCO; O) at …
View article: Trends in global tropospheric ozone inferred from a composite record of TOMS/OMI/MLS/OMPS satellite measurements and the MERRA-2 GMI simulation
Trends in global tropospheric ozone inferred from a composite record of TOMS/OMI/MLS/OMPS satellite measurements and the MERRA-2 GMI simulation Open
Past studies have suggested that ozone in the troposphere has increased globally throughout much of the 20th century due to increases in anthropogenic emissions and transport. We show, by combining satellite measurements with a chemical tr…
View article: The NASA Wallops Flight Facility Digital Ozonesonde Record: Reprocessing, Uncertainties, and Dual Launches
The NASA Wallops Flight Facility Digital Ozonesonde Record: Reprocessing, Uncertainties, and Dual Launches Open
The NASA Wallops Flight Facility (WFF; Wallops Is., VA, USA) is the longest continuously operating ozonesonde station in the continental United States (since 1970). The well‐established WFF ozonesonde system comprises a Science Pump Corpor…
View article: Ozonesonde Quality Assurance: JOSIE-SHADOZ (2017) and SHALLOTS (2018)
Ozonesonde Quality Assurance: JOSIE-SHADOZ (2017) and SHALLOTS (2018) Open
Ozonesonde data constitute a mainstay of satellite calibration and are used for climatologies and analysis of trends, especially in the lower stratosphere where satellites are most uncertain. The electrochemical-concentration cell (ECC) oz…
View article: Trends in Global Tropospheric Ozone Inferred from a Composite Record of TOMS/OMI/MLS/OMPS Satellite Measurements and the MERRA-2 GMI Simulation
Trends in Global Tropospheric Ozone Inferred from a Composite Record of TOMS/OMI/MLS/OMPS Satellite Measurements and the MERRA-2 GMI Simulation Open
Past studies have suggested that ozone in the troposphere has increased globally throughout much of the 20th century due to increases in anthropogenic emissions and transport. We show by combining satellite measurements with a chemical tra…
View article: Supplementary material to "Trends in Global Tropospheric Ozone Inferred from a Composite Record of TOMS/OMI/MLS/OMPS Satellite Measurements and the MERRA-2 GMI Simulation"
Supplementary material to "Trends in Global Tropospheric Ozone Inferred from a Composite Record of TOMS/OMI/MLS/OMPS Satellite Measurements and the MERRA-2 GMI Simulation" Open
A. Validation and Adjustments Made to OMI/MLS TCO
View article: Ozonesonde Quality Assurance: The JOSIE–SHADOZ (2017) Experience
Ozonesonde Quality Assurance: The JOSIE–SHADOZ (2017) Experience Open
The ozonesonde is a small balloon-borne instrument that is attached to a standard radiosonde to measure profiles of ozone from the surface to 35 km with ∼100-m vertical resolution. Ozonesonde data constitute a mainstay of satellite calibra…
View article: Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde
Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde Open
NOAA's program of long-term monitoring of the vertical distribution of ozone with electrochemical concentration cell (ECC) ozonesondes has undergone a number of changes over the 50-year record. In order to produce a homogenous data set, th…