The interannual variability of tropical lower stratosphere ozone and its connections to sea surface temperatures in the equatorial Pacific are examined using a combination of chemistry climate model simulations, satellite observations, and reanalyses.
In this study, we present the result of the application of space-based sulfur dioxide (SO2) observations to evaluate the efficacy of cleantech solutions in reducing air polluting emissions from metal smelting.
Asthma is the most prevalent chronic respiratory disease worldwide, affecting 358 million people in 2015. Ambient air pollution exacerbates asthma among populations around the world and may also contribute to new-onset asthma.
Ground and satellite observations show that air pollution regulations in the United States (US) have resulted in substantial reductions in emissions and corresponding improvements in air quality over the last several decades. However, large uncertainties remain in evaluating how recent regulations affect different emission sectors and pollutant trends.
In the troposphere, ozone is both a major pollutant and a strong greenhouse gas. Although spaceborne and ground-based observations largely agree on the overall tropospheric ozone loading, estimates of decadal-scale trends vary significantly between datasets.
Variations in stratospheric water vapor are known to have a significant impact on surface climate, yet the processes controlling the long-term evolution of stratospheric humidity remain incompletely understood.
NASA Goddard Earth Observing System Chemistry Climate Model (GEOSCCM) simulations reproduce the tropospheric ozone distribution observed by Aura OMI/MLS. The simulation shows that photochemical production exceeds loss throughout Tropics.
This study combines remote sensing observations and modeling to assess the effects of processes other than descent on such estimates, thus providing new information to improve both data-driven and modeled estimates of three-dimensional transport. These results are important to verifying climate model results, and highlight the need for continuing global measurement of long-lived trace gases.
This result is the first validation of modeling Nitrogen dioxide (NO2) results with the widespread in situ network, which became recently available. Our study demonstrates the capabilities of chemistry-transport models (CTMs) such as CHIMERE, combined with satellite observations from Aura OMI, to simulate NO2 concentrations at the surface over China.
Formaldehyde (HCHO) plays a role in determining the oxidizing capacity of the global troposphere. The principal source of HCHO is the oxidation of methane (CH4), which provides a global ambient background. Minor direct HCHO sources include biomass burning, industry, agriculture, automobiles, shipping, and vegetation
Stratospheric polar processes, such as the potential for ozone loss via heterogeneous chemical reactions, depend critically on temperature. We have assessed the temperature biases of several modern meteorological reanalysis datasets.
How well can the impacts of changes in ozone depleting substances (ODSs) and greenhouse gases (GHGs) on global ozone (O3 ) be detected and distinguished? Aura Microwave Limb Sounder (MLS) Global O3 profiles are used to detect fingerprints of ODS & GHG impacts.
02.13.2018 - NASA ended the Tropospheric Emission Spectrometer's (TES) almost 14-year career of discovery. TES was the first instrument designed to monitor ozone in the lowest layers of the atmosphere directly from space. Its high-resolution observations led to new measurements of atmospheric gases that have altered our understanding of the Earth system.