A5021824746- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Atomic and Subatomic Physics Research
- Neonatal Health and Biochemistry
- Precipitation Measurement and Analysis
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Erythrocyte Function and Pathophysiology
- NMR spectroscopy and applications
- Methane Hydrates and Related Phenomena
- Methemoglobinemia and Tumor Lysis Syndrome
York University
2005-2013
Universities Space Research Association
2013
Goddard Space Flight Center
2013
Jet Propulsion Laboratory
2010-2013
California Institute of Technology
2011
Abstract. This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: ACE Fourier Transform Spectrometer (ACE-FTS) and Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare latest data products ACE-FTS ACE-MAESTRO with coincident nearly 20 satellite-borne, airborne, balloon-borne ground-based instruments, analysing volume mixing...
Abstract. A global three-dimensional (i.e. latitude, longitude, altitude) climatology of tropospheric ozone is derived from the sounding record by trajectory mapping. Approximately 52 000 ozonesonde profiles more than 100 stations worldwide since 1965 are used. The small number results in a sparse geographical distribution. Here, forward and backward calculations performed for each to map measurements other locations, so fill spatial domain. This possible because lifetime troposphere order...
Abstract. The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003, carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique. One these instruments, ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio (VMR) nitrous oxide (N2O) from upper troposphere to lower mesosphere at a resolution about 3–4 km. In this study, quality ACE-FTS version 2.2 N2O data assessed...
Abstract. This study explores a domain-filling trajectory approach to generate global ozone climatology from relatively sparse ozonesonde data. Global soundings comprising 51 898 profiles at 116 stations over 44 yr (1965–2008) are used, which forward and backward trajectories calculated meteorological reanalysis data map measurements other locations so fill in the spatial domain. The resulting is archived monthly for five decades 1960s 2000s on grid of 5° × 1 km (latitude, longitude,...
Abstract. The Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) aboard the Canadian satellite SCISAT (launched in August 2003) was designed to investigate composition of upper troposphere, stratosphere, and mesosphere. ACE-FTS utilizes solar occultation measure temperature pressure as well vertical profiles over thirty chemical species including O3, H2O, CH4, N2O, CO, NO, NO2, N2O5, HNO3, HCl, ClONO2, CCl3F, CCl2F2, HF. Global coverage for each is obtained...
The severe Arctic ozone reduction in the winter 2004/2005 is analyzed using ACE‐FTS observations and four different analysis techniques: correlations between long‐lived tracers (adjusted to account for mixing), an artificial tracer correlation method, a profile‐descent technique, empirical relationship loss potential PSC volume. average maximum was about 2.1 ppmv at 475 K–500 K (∼18 km–20 km). Over 60% of 425 K–475 (∼16 km–18 km) destroyed. total column 119 DU, ∼20–30 DU larger than largest...
Abstract. This paper presents the first global set of observations CO2 in mesosphere and lower thermosphere (MLT) obtained by ACE-FTS instrument on SCISAT-I, a small Canadian satellite launched 2003. The use solar occultation technique document fall-off mixing ratio MLT region. beginning CO2, or "knee" occurs at about 78 km lies higher than CRISTA-1 measurements (~70 km) but SABER 1.06 (~80 much rocket measurements. We also present CO concurrently which provide important constraints for...
The IONS‐04, IONS‐06, and ARC‐IONS ozone sounding campaigns over North America in 2004, 2006, 2008 obtained approximately 1400 profiles, five series of coordinated closely spaced (typically daily) launches. Although this coverage is unprecedented, it still somewhat sparse its geographical spacing. Here we use forward back trajectory calculations for each to map measurements a number other locations so fill the spatial domain. This possible because lifetime troposphere order weeks....
Abstract. We investigate the relative impacts of biomass burning emissions and dynamics on tropical upper tropospheric carbon monoxide (CO) ozone (O3) over western central Indonesia during August–November 2006 fires in equatorial Asia by using a global three-dimensional model chemistry (GEOS-Chem) comparing results with Microwave Limb Sounder (MLS) observations CO O3. GEOS-Chem O3 show similarities MLS observed enhancements from convective lifting fire emissions. In troposphere (UT),...
Abstract. Simulations of CO, N2O and CH4 from a coupled chemistry-climate model (CMAM) are compared with satellite measurements Odin Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), Aura Microwave Limb Sounder (Aura/MLS). Pressure-latitude cross-sections seasonal time series demonstrate that CMAM reproduces the observed global N2O, distributions quite well. Generally, excellent agreement is found between CO simulations...
This paper presents a comparison of co‐located and near simultaneous CO measurements from January to May, 2004 the Arctic southern polar regions using ACE‐FTS, in solar occultation mode, Odin/SMR, which measures atmospheric emission. We find that there is excellent agreement between two instruments at locations investigated over 4 orders magnitude lower stratosphere thermosphere. There also good with CMAM model simulation 20 km 90 sub‐tropical tropical latitudes but poorer upper mesosphere...
Abstract. From January to March 2005, the Atmospheric Chemistry Experiment high resolution Fourier transform spectrometer (ACE-FTS) on SCISAT-1 measured many of changes occurring in Arctic (50–80° N) lower stratosphere under very cold winter conditions. Here we focus partitioning between inorganic chlorine reservoirs HCl and ClONO2 their activation into ClO. The simultaneous measurement these species by ACE-FTS provides data needed follow during recovery Cl-reservoir HCl. time evolution HCl,...
The Fourier transform spectrometer on SCISAT‐1 observed enhanced concentrations of N 2 O above 50 km in February 2004 and 2006 the wintertime polar region. These anomalously high are associated with transport levels NO x night region from upper mesosphere lower thermosphere both cases following sudden warming events middle January. is produced by auroral electron precipitation. Simulations using a atmosphere chemistry climate model show significant amounts reaction ground state atomic...
Arctic denitrification in the winter 2004/2005 is analyzed using measurements from satellite instrument ACE‐FTS. Two methods based on changes correlations of odd nitrogen (NO y ) versus methane and an artificial long‐lived tracer are employed. The observations show that significant occurred region 15 km–20 km it was spatially inhomogeneous within polar vortex. Before vortex breakup mid‐March 2005 a maximum 8 ± 0.8 ppbv, accounting for relative reduction over 50%, observed at ∼450 K (∼17 km)...
Abstract. A global three-dimensional (i.e. latitude, longitude, altitude) climatology of tropospheric ozone is derived from the sounding record by trajectory mapping. Approximately 52 000 ozonesonde profiles more than 100 stations worldwide since 1962 are used. The small number causes set soundings to be sparse in geographical spacing. Here, forward and backward calculations performed for each map measurements a other locations, so fill spatial domain. This possible because lifetime...
Abstract. Multi-year Microwave Limb Sounder (MLS) carbon monoxide (CO) measurements at 215 hPa are employed to present a climatological view of seasonal variation upper tropospheric trans-Pacific transport Asian air pollution. The show that the peaks in late boreal spring and early summer. Although strongest pollution outflow occurs summer, "transport pathway" over northeast Pacific is narrower summer than spring. Results from two chemistry models GEOS-Chem GEM-AQ compared MLS observations....
Abstract. This study explores a domain-filling trajectory approach to generate global ozone climatology from relatively sparse ozonesonde data. Global soundings comprising 51 898 profiles at 116 stations over 44 yr (1965–2008) are used, which forward and backward trajectories calculated meteorological reanalysis data, map measurements other locations so fill in the spatial domain. The resulting is archived monthly for five decades 1960s 2000s on a~grid of 5° × 1 km (latitude, longitude,...
The chemical discontinuity at the extratropical tropopause (ExTP) and stratosphere‐troposphere exchange (STE) pathways are investigated using long‐lived species carbon monoxide (CO) ozone (O 3 ) measured by Aura Microwave Limb Sounder (MLS). A relative coordinate, latitude (TpLat), is developed based on potential vorticity (PV) from Goddard Earth Observing System version 5 (GEOS‐5) data assimilation system. TpLat defined as shortest geographic distance along an isentropic surface to...
Abstract. This paper presents extensive validation analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: ACE Fourier Transform Spectrometer (ACE-FTS) and Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. The instruments operate mid-infrared ultraviolet-visible-near-infrared spectral regions using solar occultation technique. In order to continue long-standing record measurements space,...
Abstract. The Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) aboard the Canadian satellite SCISAT (launched in August 2003) was designed to investigate composition of upper troposphere, stratosphere, and mesosphere. ACE-FTS utilizes solar occultation measure temperature pressure as well vertical profiles over thirty chemical species including O3, H2O, CH4, N2O, CO, NO, NO2, N2O5, HNO3, HCl, ClONO2, CCl3F, CCl2F2, HF. Global coverage for each is obtained...
Abstract. From January to March 2005, the Atmospheric Chemistry Experiment high resolution Fourier transform spectrometer (ACE-FTS) on SCISAT-1 measured many of changes occurring in Arctic (50–80° N) lower stratosphere under very cold winter conditions. Here we focus partitioning between inorganic chlorine reservoirs HCl and ClONO2 their activation into ClO. The simultaneous measurement these species by ACE-FTS provides data needed follow during recovery Cl-reservoir HCl. time evolution HCl,...
Abstract. Simulations of CO, N2O and CH4 from a coupled chemistry-climate model (CMAM) are compared with satellite measurements Odin Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), Aura Microwave Limb Sounder (Aura/MLS). Pressure-latitude cross-sections seasonal time series demonstrate that CMAM reproduces the observed global distributions polar winter evolutions N2O, quite well. Generally, excellent agreement is found in CO...
Abstract Background and Objectives To investigate the prevalence, genotype haematological characteristics of glucose‐6‐phosphate dehydrogenase ( G6PD ) deficiency in blood donor population Wuxi area (Jiangsu Province, China) to assess impact their red cell RBC units on clinical transfusion. Materials Methods We conducted genotyping large‐scale screening for enzyme activity donors City. In addition, we assessed parameters ‐deficient non‐deficient donors, investigated adverse transfusion...
Abstract. The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003, carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique. One these instruments, ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio (VMR) nitrous oxide (N2O) from upper troposphere to lower mesosphere at a resolution about 3–4 km. In this study, quality ACE-FTS version 2.2 N2O data assessed...