Hydroxyl (OH) radicals play a vital role in maintaining the oxidizing capacity of the atmosphere. To understand variations in OH radicals both source and sink terms must be understood. Currently the overall sink term, or the total atmospheric reactivity to OH, is poorly constrained. Here, we present a new on-line method to directly measure the total OH reactivity (i.e. total loss rate of OH rad...

Monitoring of an industrial gas turbine is important since it gives valuable information for the customer about maintenance, performance and process health. The objective of the paper is to develop a monitoring system for an industrial gas turbine application with a model based diagnosis approach. A constant gain extended Kalman observer is developed. The observer compensates for different ambi...

This laboratory study evaluates an experimental set-up to study the immersion freezing properties of ice residuals (IRs) at a temperature ranging from −26 to −34 ◦C using two continuous-flow diffusion chamber-style ice nucleation chambers coupled with a virtual impactor and heat exchanger. Ice was nucleated on the total ambient aerosol through an immersion freezing mechanism in an ice nucleatio...

NOs and NOv were determined in the interstitial air of surface snow and in ambient air at Summit, Greenland. NOs levels in interstitial air were 3 to > 10 times those in ambient air, and were generally greater than ambient NOy levels. [NO y] in interstitial air varied diurnally in a manner consistent with photochemical generation within the snowpack. These observations imply that photochemical ...

To understand how the increase in atmospheric CO2 from human activity may affect leaf damage by forest insects, we examined host plant preference and larval performance of a generalist herbivore, Antheraea polyphemus Cram., that consumed foliage developed under ambient or elevated CO2. Larvae were fed leaves from Quercus alba L. and Quercus velutina Lam. grown under ambient or plus 200 microl/l...

AMBIENT ATMOSPHERE AFTER OBLIQUE IMPACTS. K. Kurosawa, Y. Sekine, S. Sugita, N. Ohkouchi, N. O. Ogawa, K. Ishibashi, T. Kadono, S. Ohno, and T. Matsui, Dept. of Complexity Sci. & Eng., Univ. of Tokyo (5-1-5, Kashiwanoha, Kashiwa, Chiba, JAPAN; [email protected]), IFREE, JAMSTEC (2-15, Natsushima, Yokosuka, Kanagawa, JAPAN), Dept. of Earth and Planet. Sci., Univ. of Tokyo (73-1, Ho...

Background Understanding near-surface fire–atmosphere interactions at turbulence scale is fundamental for predicting fire spread behaviour. Aims This study aims to investigate the interaction and accompanying energy transport processes within convective boundary layer. Methods Three groups of large eddy simulations representing common ranges layer conditions intensities were used examine how am...