1,721,103 research outputs found
: Laser Induce Fluorescence Observation of NO2, Peroxy Nitrates (PNs), Alkyl Nitrates (ANs) and HNO3 on the BAE146
No full textOxidation of Biogenic VOC: analysis and implications from direct OH reactivity measurements
No full text
Nuove politiche per il mondo agricolo: multifunzionalità e sviluppo integrato del territorio
No full textAtti della Giornata di Studio"La nuova ruralità in Italia in rapporto alla politica dei fondi strutturali dell'U.e" (Roma, 22-23 febbraio 2001) organizzata dal Gruppo di Ricerca dell'A.Ge.I "Geografia comparata delle aree agricole europee ed extraeuropee" con il contributo finanziario del MIUR:Sezione I: La ridefinizione politica, economica e geografica degli spazi agricoli.Sezione II: La nuova ruralità tra agricoltura e agri-cultura.Sezione III: Gli spazi agricoli regionali fra tradizione, multifunzionalità e politiche di sviluppo.Sezione IV: La riscoperta delle potenzialità del settore primario nelle produzioni tipiche e nelle produzioni innovative.Sezione V: I nuovi problemi del mondo agricolo: la difficoltà della gestione
Climate Change and atmospheric composition research via baloons
No full textA brief description of a compact, high sensitive and selective fluorescence technique
for the atmospheric composition measurements is given here. This technique that uses
a laser as a source has been used at the beginning on balloon platforms, in the last years it
is preferred to use an aircraft as flying platform because it allows the measurements of atmospheric
species not only as function of the altitude, but also the study of the variation
from region to region. A short description of the instrument developed at the CETEMPSUniversit`
a di L’Aquila, some results and future improvements and deployment will be also
reported
Lidar observations of mesospheric sodium over Italy
No full textWe have developed a lidar system for the measurements of the
mesospheric atomic sodium (Na) number density profile. The performances and the
main characteristics of the system are evaluated showing the first observations: Na
number density profiles can be obtained with a resolution of 300 m in altitude and of
200 s in time, the relative uncertainty is between 5% and 10%. These features also
allow to discuss the capability of the system to detect the time and space variability of
Na density profiles, which is typical of the gravity wave propagation. The
preliminary analysis of the sodium profile dynamics along a 7 hours measurement
session, started from 19:30UT on 10 April 1997, shows the presence of wave-like
perturbations with characteristics typical of propagating gravity waves
Nitrogen management is essential to prevent tropical oil palm plantations from causing ground level ozone pollution
No full textMore than half the world’s rainforest has been lost to agriculture
since the Industrial Revolution. Among the most widespread tropical
crops is oil palm (Elaeis guineensis): global production now
exceeds 35 million tonnes per year. In Malaysia, for example, 13%
of land area is now oil palm plantation, compared with 1% in 1974.
There are enormous pressures to increase palm oil production for
food, domestic products, and, especially, biofuels. Greater use of
palm oil for biofuel production is predicated on the assumption
that palm oil is an ‘‘environmentally friendly’’ fuel feedstock. Here
we show, using measurements and models, that oil palm plantations
in Malaysia directly emit more oxides of nitrogen and volatile
organic compounds than rainforest. These compounds lead to the
production of ground-level ozone (O3), an air pollutant that damages
human health, plants, and materials, reduces crop productivity,
and has effects on the Earth’s climate. Our measurements show
that, at present, O3 concentrations do not differ significantly over
rainforest and adjacent oil palm plantation landscapes. However,
our model calculations predict that if concentrations of oxides of
nitrogen in Borneo are allowed to reach those currently seen over
rural North America and Europe, ground-level O3 concentrations
will reach 100 parts per billion (109) volume (ppbv) and exceed
levels known to be harmful to human health. Our study provides
an early warning of the urgent need to develop policies that
manage nitrogen emissions if the detrimental effects of palm oil
production on air quality and climate are to be avoided
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