Anthropogenic and Natural NOx Emissions over the United States: Comprehensive Evaluations and Implications for Surface Ozone Prediction
Nitrogen oxides (NOx = NO + NO2) play crucial roles in the formation of ozone, aerosol, and acid rain which are unfavorable to human health, climate, and ecosystem stabilities. NOx is emitted by both anthropogenic and natural sources, such as fossil fuel combustion, soil bacteria, lightning, etc. Accurate knowledge of NOx emissions is essential for relevant scientific research and air pollution control policies.
Postseismic Response Following the 2012 Mw 7.6 Nicoya, Costa Rica Earthquake
Characterization of the surface deformation related to the 2012
moment magnitude (Mw) 7.6 Nicoya earthquake was undertaken using
continuous and campaign Global Positioning System (GPS) observations. This
location is uniquely situated to monitor megathrust conditions as the peninsula
extends to within 60 km of the trench. The entirety of the postseismic and
relocking period were considered, totaling 5 years. Seismic observations were
also included, to cumulatively elucidate the timing and spatial extent of