Gregory Osterman

NASA · Earth Sciences Division

In this paper, we compare Orbiting Carbon Observatory 2 (OCO-2) measurements of column-averaged dry-air mole fractions (DMF) of CO 2 (X CO 2) and its urban-rural differences against ground-based remote sensing data measured by the Munich Urban Carbon Column network (MUCCnet). Since April 2020, OCO-2 has regularly conducted target observations in Mu...

In this paper, we compare Orbiting Carbon Observatory 2 (OCO-2)’s measurements of column-averaged dry air mole fractions of CO2 (XCO2) and its urban-rural differences against ground-based remote sensing data measured by the Munich Urban Carbon Column network (MUCCnet). Since April 2020, OCO-2 regularly conducts target observations in Munich, German...

NASA's Orbiting Carbon Observatory-3 (OCO-3) was installed on the International Space Station (ISS) on 10 May 2019. OCO-3 combines the flight spare spectrometer from the Orbiting Carbon Observatory-2 (OCO-2) mission, which has been in operation since 2014, with a new Pointing Mirror Assembly (PMA) that facilitates observations of non-nadir targets...

Seasonal CO2 exchange in the boreal forest plays an important role in the global carbon budget and in driving interannual variability in seasonal cycles of atmospheric CO2. Satellite-based observations from polar orbiting satellites like the Orbiting Carbon Observatory-2 (OCO-2) offer an opportunity to characterize boreal forest seasonal cycles acr...

Abstract. Seasonal CO₂ exchange in the Boreal Forest plays an important role in the global carbon budget and in driving interannual variability in seasonal cycles of atmospheric CO₂. Satellite-based observations from polar orbiting satellites like the Orbiting Carbon Observatory-2 (OCO-2) offer an opportunity to characterize B...

Abstract. We characterize the magnitude of seasonally and spatially varying biases in the National Aeronautics and Space Administration (NASA) Orbiting Carbon Observatory-2 (OCO-2) Version 8 (v8) and the Atmospheric CO₂ Observations from Space (ACOS) Greenhouse Gas Observing SATellite (GOSAT) version 7.3 (v7.3) satellite CO₂ r...

Since September 2014, NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite has been taking measurements of reflected solar spectra and using them to infer atmospheric carbon dioxide levels. This work provides details of the OCO-2 retrieval algorithm, versions 7 and 8, used to derive the column-averaged dry air mole fraction of atmospheric CO2 (XC...

The Tropospheric Emission Spectrometer (TES) on the A-Train Aura satellite was designed to profile tropospheric ozone and its precursors, taking measurements from 2004 to 2018. Starting in 2008, TES global sampling of tropospheric ozone was gradually reduced in latitude, with global coverage stopping in 2011. To extend the record of TES, this work...

NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, XCO2, in the Earth's atmosphere for over 2 years. In this paper, we describe the comparisons between the first major release of the OCO-2 retrieval algorithm (B7r) and XCO2 from OCO-2's primary ground-based validation network: the T...

NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry air mole fractions, XCO2, in the Earth’s atmosphere for almost two years. In this paper, we describe the comparisons between the OCO-2 version 7Br retrievals and XCO2 estimates from OCO-2's primary ground-based validation network: the Total Carbon Col...

In recent years, space-borne observations of atmospheric carbon dioxide (CO2) have been increasingly used in global carbon-cycle studies. In order to obtain added value from space-borne measurements, they have to suffice stringent accuracy and precision requirements, with the latter being less crucial as it can be reduced by just enhanced sample si...

In recent years, space-borne observations of atmospheric carbon-dioxide (CO2) have become increasingly used in global carbon-cycle studies. In order to obtain added value from space-borne measurements, they have to suffice stringent accuracy and precision requirements, with the latter being less crucial as it can be reduced by just enhanced sample...

The objective of the National Aeronautics and Space Administration's (NASA) Orbiting Carbon Observatory-2 (OCO-2) mission is to retrieve the column-averaged carbon dioxide (CO2) dry air mole fraction (XCO2) from satellite measurements of reflected sunlight in the near-infrared. These estimates can be biased by clouds and aerosols within the instrum...

Transport of pollution from remote sources into the state of Texas has been shown by modeling techniques, satellite, and in situ data. Attaining a better understanding of the impact (i.e., temporally) of remote pollution sources will provide a more robust/quantifiable basis for State Implementation Plans (SIPs) that govern air quality. Utilizing Tr...

Consistent validation of satellite CO2 estimates is a prerequisite for using multiple satellite CO2 measurements for joint flux inversion, and for establishing an accurate long-term atmospheric CO2 data record. We focus on validating model and satellite observation attributes that impact flux estimates and CO2 assimilation, including accurate error...

Satellite measurements are often compared with higher-precision ground-based measurements as part of validation efforts. The satellite soundings are rarely perfectly coincident in space and time with the ground-based measurements, so a colocation methodology is needed to aggregate "nearby" soundings into what the instrument would have seen at the l...

The Orbiting Carbon Observatory-2 (OCO-2), launched on 2 July 2014, is a NASA mission designed to measure the column-averaged CO2 dry air mole fraction, X-CO2. Towards that goal, it will collect spectra of reflected sunlight in narrow spectral ranges centered at 0.76, 1.6 and 2.0 mu m with a resolving power (lambda/Delta lambda) of 20 000. These sp...

Satellite measurements are often compared with higher-precision ground-based measurements as part of validation efforts. The satellite soundings are rarely perfectly coincident in space and time with the ground-based measurements, so a colocation methodology is needed to aggregate "nearby" soundings into what the instrument would have seen at the l...

Many modern instruments generate more data than may be fully processed in a timely manner. For some atmospheric sounders, much of the raw data cannot be processed into meaningful observations due to suboptimal viewing conditions, such as the presence of clouds. Conventional solutions are quick, empirical-threshold filters hand-created by domain exp...

Amazon forests exert a major influence on the global carbon cycle, but quantifying the impact is complicated by diverse landscapes and sparse data. Here we examine seasonal carbon balance in southern Amazonia using new measurements of column-averaged dry air mole fraction of CO2 (XCO2) and solar induced chlorophyll fluorescence (SIF) from the Green...

Many modern instruments generate more data than may be fully processed in a timely manner. For some atmospheric sounders, much of the raw data cannot be processed into meaningful observations due to suboptimal viewing conditions, such as the presence of clouds. Conventional solutions are quick, empirical-threshold filters hand-created by domain exp...

Accurate representation of ozone in the extrat-ropical upper troposphere (UT) remains a challenge. How-ever, the implementation of hyper-spectral remote sensing using satellite instruments such as the Tropospheric Emission Spectrometer (TES) provides an avenue for mapping ozone in this region, from 500 to 300 hPa. As a polar orbiting satel-lite TES...

Comparisons are made between mid-tropospheric Tropospheric Emission Spectrometer (TES) carbon dioxide (CO{sub 2}) satellite measurements and ocean profiles from three Hiaper Pole-to-Pole Observations (HIPPO) campaigns and land aircraft profiles from the United States Southern Great Plains (SGP) Atmospheric Radiation Measurement (ARM) site over a 4-...

We describe a method of evaluating systematic errors in measurements of total column dry-air mole fractions of CO2 (X-CO2) from space, and we illustrate the method by applying it to the v2.8 Atmospheric CO2 Observations from Space retrievals of the Greenhouse Gases Observing Satellite (ACOS-GOSAT) measurements over land. The approach exploits the l...

We describe a method of evaluating systematic errors in measurements of total column dry-air mole fractions of CO_2 (X_(CO_2)) from space, and we illustrate the method by applying it to the v2.8 Atmospheric CO_2 Observations from Space retrievals of the Greenhouse Gases Observing Satellite (ACOS-GOSAT) measurements over land. The approach exploits...

To help protect human health and ecosystems, regional-scale atmospheric chemistry models are used to forecast high ozone events and to design emission control strategies to decrease the frequency and severity of ozone events. Despite the impact that nighttime aloft ozone can have on surface ozone, regional-scale atmospheric chemistry models often d...

Climate science data are often distributed cross-institutionally and made available using heterogeneous interfaces. With respect to observational carbon-dioxide (CO2) records, these data span across national as well as international institutions and are typically distributed using a variety of data standards. Such an arrangement can yield challenge...

Accurate representation of ozone in the extratropical upper troposphere (UT) remains a challenge. However, the implementation of hyper-spectral remote sensing using satellite instruments such as the Tropospheric Emission Spectrometer (TES) provides an avenue for mapping ozone in this region, from 500 to 300 hPa. As a polar orbiting satellite TES ob...

The utilization of Tropospheric Emission Spectrometer (TES) Level 2 (L2) retrieval products for the purpose of assessing long term changes in atmospheric trace gas composition requires knowledge of the overall radiometric stability of the Level 1B (L1B) radiances. The purpose of this study is to evaluate the stability of the radiometric 5 calibrati...

The Tropospheric Emission Spectrometer (TES), a hyperspectral infrared instrument on the Aura satellite, retrieves a vertical profile of tropospheric ozone. However, polar-orbiting instruments like TES provide limited nadir-view coverage. This work illustrates the value of these observations when taken in context with geostationary imagery describi...

The utilization of Tropospheric Emission Spectrometer (TES) Level 2 (L2) retrieval products for the purpose of assessing long term changes in atmospheric trace gas composition requires knowledge of the overall radiometric stability of the Level 1B (L1B) radiances. The purpose of this study is to evaluate the stability of the radiometric calibration...

1] Ammonia plays an important role in many biogeo-chemical processes, yet atmospheric mixing ratios are not well known. Recently, methods have been developed for retrieving NH 3 from space‐based observations, but they have not been compared to in situ measurements. We have conducted a field campaign combining co‐located surface measurements and sat...

The Tropospheric Emission Spectrometer (TES), a hyperspectral infrared instrument on the Aura satellite, retrieves a vertical profile of tropospheric ozone. However, polar-orbiting instruments like TES provide limited nadir-view coverage. This work illustrates the value of these observations when taken in context with information about synoptic-sca...

Ammonia plays an important role in many biogeochemical processes, yet atmospheric mixing ratios are not well known. The emissions sources are uncertain and it is difficult to measure NH3 in situ. Recently, methods have been developed for retrieving NH3 from space-based observations, yet they have not been compared to in situ measurements. We have c...

The JAXA/NIES/MOE Greenhouse gas Observing Satellite (GOSAT) was launched in 2009, carrying its main instrument, the TANSO-FTS (Fourier transform spectrometer), to measure total columns of CO2 (Xco2). The Atmospheric CO2 Observations from Space (ACOS) group, which was formed out of the Orbiting Carbon Observatory (OCO) science team, has worked with...

We compare Tropospheric Emission Spectrometer (TES) versions 3 and 4, V003 and V004, respectively, nadir-stare ozone profiles with ozonesonde profiles from the Arctic Intensive Ozonesonde Network Study (ARCIONS, http://croc.gsfc.nasa.gov/arcions/ during the Arctic Research on the Composition of the Troposphere from Aircraft and Satellites (ARCTAS)...

Twice-daily ozonesondes were launched from Harrow, in southwestern Ontario, Canada, during the BAQS-Met (Border Air Quality and Meteorology Study) field campaign in June and July of 2007. A co-located radar windprofiler measured tropopause height continuously. These data, in combination with continuous surface ozone measurements and geo-statistical...

Twice-daily ozonesondes were launched from Harrow, Ontario (east of Detroit) during the BAQS-Met (Border Air Quality and Meteorology Study) campaign in the summer of 2007. A co-located radar windprofiler measured tropopause height continuously. Simulation results from the dispersion model FLEXPART, using the output of the Environment Canada Global...

We investigate the effects of anthropogenic and biogenic sources on tropospheric CO enhancements and outflow over North America and the Atlantic during July–August 2006, the 3rd warmest summer on record. The analysis is performed using the 3D Regional chEmical trAnsport Model (REAM), satellite data from TES on the Aura satellite, MOPITT on the Terr...

While tropospheric ozone is only about 10% of the total amount of ozone present in the Earth atmosphere, it is nevertheless exceedingly important for the multiple roles it plays. However, the global height resolved distribution of ozone in the troposphere is largely unknown. The launch on July 15, 2004, of NASA's third of the Earth Observing System...

Quantifying the impacts of remote sources on individual air quality exceedances remains a significant challenge for air quality forecasting. One goal of the 2006 Second Texas Air Quality Study (TexAQS II) was to assess the impact of distant sources on air quality in east Texas. From 23 to 30 August 2006, retrievals of tropospheric carbon monoxide (...

1] Quantifying the impacts of remote sources on individual air quality exceedances remains a significant challenge for air quality forecasting. One goal of the 2006 Second Texas Air Quality Study (TexAQS II) was to assess the impact of distant sources on air quality in east Texas. From 23 to 30 August 2006, retrievals of tropospheric carbon monoxid...

We compare Tropospheric Emission Spectrometre (TES) versions 3 and 4, V003 and V004, respectively, nadir-stare ozone profiles with ozonesonde profiles from the Arctic Intensive Ozonesonde Network Study (ARCIONS, http://http://croc.gsfc.nasa.gov/arcions/) during the Arctic Research on the Composition of the Troposphere from Aircraft and Satellites (...

Different characteristics of Indonesian and African wildfires for October-December 2006 are investigated using satellite data from Aura TES and MLS. The strength of the wildfires is characterized using GFED wildfire CO emissions for the time period. The variations of the spatial distributions of the GFED CO emissions are generally anti-correlated w...

During June-August 2008 a string of wildfires hit Northern and Central California. The fires burned over 800,00 acres burned over the time period. There were several special observations made by the NASA/JPL Tropospheric Emission Spectrometer (TES) in coordination with the ARCTAS-CA aircraft campaign. We will use data from TES and other satellite i...

We are systematically characterizing the sensitivity that is possible and needed for the next leap forward in remote sensing of ozone, with an emphasis of reaching lower into the troposphere. Space based measurements of ozone has advanced from column measurements (for example TOMS, OMI, GOME, SCIAMACHY) to profiles that distinguish the lower tropos...

In this study, we compare carbon monoxide (CO) products from the Measurements of Pollution in the Troposphere (MOPITT) and Tropospheric Emission Spectrometer (TES) and investigate the possible causes of the differences between retrievals for these two data sets. Direct comparisons of CO retrievals for July 2006 show that TES CO concentrations are c...

The migration of enhancements in NO_2 concentration, outgoing longwave radiation (OLR), and radiative effects associated with the onset of the North American Monsoon in July 2005 has been investigated using satellite data and the Regional Chemical Transport Model (REAM). The satellite data include the tropospheric NO2 columns, tropospheric O_3 prof...

The impact of surface emissions on the zonal structure of tropical tropospheric ozone and carbon monoxide is investigated for November 2004 using satellite observations, in-situ measurements, and chemical transport models in conjunction with inverse-estimated surface emissions.Vertical ozone profiles from the Tropospheric Emission Spectrometer (TES...

The satellite observations provide constraints on detailed atmospheric modeling, including emissions inventories, indications of transport, harmonized data over vast areas suitable for trends analysis, and a link between spatial scales ranging from local to global, and temporal scales from diurnal to interannual. The international scientific commun...

During NASA's ARCTAS (Arctic Research of the Composition of the Troposphere with Aircraft and Satellites; http://espo.nasa.gov/arctas) spring and summer 2008 campaigns, an ozonesonde network, ARC- IONS (ARCTAS Intensive Ozonesonde Network Study), launched ozonesonde-radiosonde packages each day (1-20 April, 26 June-12 July) during the A-Train satel...

Global high-spectral resolution (0.06 cm-1) nadir measurements from TES-Aura enable the simultaneous retrieval of a number of tropospheric pollutants and trace gases in addition to the TES standard operationally retrieved products (e.g. carbon monoxide, ozone). Ammonia (NH3) is one of the additional species that can be retrieved in conjunction with...

Recent NASA and Eumetsat satellites offer unparalleled capabilities for remote sensing of air quality throughout the troposphere. Combining both active and passive remote sensing, these instruments probe atmospheric aerosols, clouds and trace gases across the spectrum from the ultraviolet to the microwave. Onboard the Aqua satellite leading NASA's...

Among the most important concerns in the assessment of the impact of future climate change on human and natural sectors is its effect on future air quality. We will show results of study using satellite remote sensing data from the NASA Tropospheric Emission Spectrometer (TES) and Atmospheric Infrared Sounder (AIRS) satellite instruments in conjunc...

We use the Regional chEmical trAnsport Model (REAM) to analyze the contributions of lightning and anthropogenic NOx on ozone concentrations over the U.S. and the western North Atlantic Ocean from June to August 2005. Tropospheric NO2 columns from OMI, tropospheric O3 columns derived from OMI and MLS measurements, and vertical O3 profiles from TES o...

We use the Regional chEmical trAnsport Model (REAM) to investigate the impacts of lightning NOx production and anthropogenic NOx emissions on radiative forcing and outgoing longwave radiation (OLR) over the United States and the western North Atlantic Ocean from June to August 2005. Tropospheric column O3 estimates based on data from the OMI and ML...

The Atmospheric Infrared Sounder (AIRS), currently on the EOS-Aqua satellite, retrieves ozone column and profile information from nadir viewing of IR emittance. We present validation of the Version 5 observations of ozone columns and profiles using coincident ozonesondes and other satellite-based observations. In particular, we utilize vertical ave...

Trace gas simulations using the Weather Research and Forecasting model with integrated chemistry (WRF- Chem Version 3) for July 2007 are applied to analyze surface and satellite measurements to understand the summertime transitions of key constituents during air pollution episodes in the Mid-Atlantic region. Surface observations from the AIRNOW and...

1] The Tropospheric Emission Spectrometer (TES) is an infrared instrument that was launched on board NASA's Aura satellite in 2004. TES is the first instrument to provide vertical information on tropospheric ozone while simultaneously measuring CO on a global basis. Before they may be used for scientific study, TES profiles must first be validated...

1] Comparisons of Tropospheric Emission Spectrometer (TES) water vapor retrievals with in situ measurements are presented. Global comparisons of TES water vapor retrievals with nighttime National Centers for Environmental Prediction RS90/RS92 radiosondes show a small (<5%) moist bias in TES retrievals in the lower troposphere (standard deviation of...

1] We compare Tropospheric Emission Spectrometer (TES) version 2 (V002) nadir ozone profiles with ozonesonde profiles from the Intercontinental Chemical Transport Experiment Ozonesonde Network Study, the World Ozone and Ultraviolet Data Center, the Global Monitoring Division of the Earth System Research Laboratory, and the Southern Hemisphere Addit...

1] The Tropospheric Emission Spectrometer (TES) is an infrared, high-resolution Fourier transform spectrometer which was launched onboard NASA's Aura satellite in 2004 and is providing global, vertically resolved measurements of ozone in the troposphere. TES version 2 (V002) data profiles have been validated in the troposphere and lower stratospher...

The Tropospheric Emission Spectrometer (TES) on the EOS Aura satellite makes global measurements of infrared radiances which are used to derive profiles of species such as O3, CO, H2O, HDO and CH4 as routine standard products. In addition, TES has a variety of special modes that provide denser spatial mapping over a limited geographical area. A con...

We investigate the effects of enhancements in biogenic VOC emissions on tropospheric carbon monoxide over the United States and Western North Atlantic Ocean during July 2006. This is performed using the 3D Regional chEmical trAnsport Model (REAM) along with data from the Tropospheric Emission Spectrometer (TES) on the NASA Aura satellite, the Measu...

The Houston/Galveston/Brazoria (HGB) area of Texas has been classified as in moderate nonattainment of the Environmental Protection Agency (EPA) 8-hour standard for ground level ozone since April 30, 2004. The Texas Commission on Environmental Quality uses photochemical model results as one of its primary tools to develop strategies to bring the HG...

During the recent NASA Tropical Composition, Cloud and Climate Coupling Experiment (TC4) in the summer of 2007, much effort was directed towards locating and sampling fresh convective outflow in the ITCZ region near Central America, coordinating observations from a variety of suborbital and satellite platforms. One of the fundamental TC4 science qu...

1] The fundamental measurement of the Tropospheric Emission Spectrometer (TES) on board the Aura spacecraft is upwelling infrared spectral radiances. Accurate TES retrievals of surface and atmospheric parameters such as trace gas amounts critically depend on well-calibrated radiance spectra. On-orbit TES nadir observations were evaluated using care...

Global satellite observations of ozone and carbon monoxide from the Microwave Limb Sounder (MLS) on the EOS Aura spacecraft are discussed with emphasis on those observations in the 215–100 hPa region (the upper troposphere and lower stratosphere). The precision, resolution and accuracy of the data produced by the MLS “version 2.2” processing algori...

The chemical and dynamical processes governing the zonal variability of tropical tropospheric ozone and carbon monoxide are investigated for November 2004 using satellite observations, in-situ measurements, and chemical transport models in conjunction with inverse-estimated surface emissions. Vertical ozone profile estimates from the Tropospheric E...

Validation of Tropospheric Emission Spectrometer (TES) tropospheric CO profiles with in situ CO measurements from the Differential Absorption CO Measurement (DACOM) instrument during the Intercontinental Chemical Transport Experiment (INTEX)-B campaigns in March to May 2006 are presented. For each identified DACOM CO profile, one to three TES CO pr...

We focus on selected CO enhancement events observed in TES data and also examine MLS and MOPITT data in the upper and lower troposphere. The events of interest include: the Siberian fires in July-Aug 2006, Indonesian fires in Sept-Oct-Nov 2006, Australian fires in mid-end Dec 2006 and the transpacific transports of pollutants in winter-spring 2007....

Studies of jet stream and frontal boundary dynamics with atmospheric tracer measurements provide insight to the coupled stratosphere-troposphere system. A-Train satellite instruments possess the horizontal and vertical resolution along with temporal and spatial coincidence necessary to identify stratospheric intrusions, investigate their three-dime...

Currently, one of the most pressing air quality issues for the state of Texas is surface ozone. The cities of Houston and Dallas are both in violation of the EPA air quality standard for 8-hour concentration of surface ozone. The Texas Commission on Environmental Quality (TCEQ) uses the CAMx air quality model to study scenarios for reducing emissio...

During the 2006 Texas Air Quality Study (TexAQS)/Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS), AIRS and TES Science Team members provided flight planning support for NASA and NOAA aircraft, large scale context for NOAA, EPA, and State of Texas surface measurements, and contributions to post-mission modeling analyses and the Ra...

The Tropospheric Emission Spectrometer (TES) on the EOS Aura satellite makes global measurements of infrared radiances that are used to derive profiles of species such as O3, CO, H2O and CH4 as routine standard products. In addition, TES has a variety of special modes that provide denser spatial mapping at the expense of reduced coverage. One of th...

During July and August 2007, 25 ozonesondes were launched from Las Tables, Panama (7.8 N, 80.3 W) resulting in a unique data set that complements and enhances data from the SHADOZ network. Launches occurred nearly daily around 1 pm to provide the best possible coincidences with overpasses of the Aura satellite. In this presentation, we examine the...

The Atmospheric Infrared Sounder (AIRS) currently on the EOS-Aqua platform globally retrieves profile information of several trace and minor gases from nadir viewing of IR emittance. We present new Version 5 results on ozone, carbon monoxide, methane and carbon dioxide and compare our results with near coincident measurements from the Tropospheric...

As part of INTEX-B, we report on the value of a satellite based method for estimating the variable location of the tropopause break. Previous work showed tropopause folding, as evidenced in lidar curtains of ozone, was consistently observed in the vicinity of strong gradients in GOES layer average specific humidity in the upper troposphere. Fold op...

As part of NASA INTEX-B we report on a satellite based empirical method for estimating the amount of stratospheric ozone present in the upper-troposphere (UT). To understand the role of anthropogenic emissions on ozone mixing ratios in the non-urban troposphere, it is vital to describe the dynamically variable background, which is influenced by the...

1] We present vertical distributions of ozone from the Tropospheric Emission Spectrometer (TES) over the tropical Atlantic Ocean during January 2005. Between 10N and 20S, TES ozone retrievals have Degrees of Freedom for signal (DOF) around 0.7 – 0.8 each for tropospheric altitudes above and below 500 hPa. As a result, TES is able to capture for the...

Atmospheric moisture cycling is an important aspect of the Earth's climate system, yet the processes determining atmospheric humidity are poorly understood. For example, direct evaporation of rain contributes significantly to the heat and moisture budgets of clouds, but few observations of these processes are available. Similarly, the relative cont...

1] We develop an approach to estimate and characterize trace gas retrievals in the presence of clouds in high spectral measurements of upwelling radiance in the infrared spectral region (650–2260 cm À1). The radiance contribution of clouds is parameterized in terms of a set of frequency-dependent nonscattering optical depths and a cloud height. The...

TES has been making measurements of both ozone and carbon monoxide in the troposphere globally since August 2004. We examine the data obtained by TES in the troposphere over the Southern portion of the United States and focus on 4 different time periods: November 2004, July/August 2005, March 2006 and July 2006. During these time periods TES has ma...

The Intercontinental Chemical Transport Experiment-Phase B (INTEX-B) is an integrated field campaign to quantify the transpacific transport and evolution of Asian pollution. During the spring and summer of 2006, the tropospheric emission spectrometer (TES) made observations of ozone and carbon monoxide using it special observation mode spanning the...

During summer 2006, TES observed a large number of ozone, carbon monoxide and water vapor latitudinal cross sections over the northern midlatitudes between 130W to 15E. We will interpret these measurements in terms of pollution transport from North America to Europe using meteorological and chemical data as well as a global chemistry transport mode...

The wealth of recent satellite observations of trace gases in the troposphere offer a unique opportunity to better understand the factors regulating tropospheric O3 and its precursors. In this context, chemical data assimilation (CDA) has emerged as a powerful tool with which to integrate these new data with atmospheric chemistry and transport mode...

We present results from the first assimilation of carbon monoxide (CO) observations from the Tropospheric Emission Spectrometer (TES) into a global three-dimensional (3-D) chemistry and transport model (CTM). A sequential sub-optimal Kalman filter assimilation scheme (Khattatov et al., 2000) was applied to assimilate TES CO profiles during November...

1] We present global, vertical profile estimates of the HDO/H 2 O ratio from the Tropospheric Emission Spectrometer (TES) on the Earth Observing System (EOS) Aura satellite. We emphasize in this paper the estimation approach and error characterization, which are critical to determining the very small absolute concentration of HDO relative to H 2 O...

The Tropospheric Emission Spectrometer (TES) is a high-resolution spaceborne sensor that is capable of observing tropospheric species. In order to exploit fully TES's potential for tropospheric constituent retrievals, an accurate and fast operational forward model was developed for TES. The forward model is an important component of the TES retriev...