New atmospheric composition observations in the Karakorum region: Influence of local emissions and large-scale circulation during a summer field campaign

作者：Putero D; Cristofanelli P^*; Laj P; Marinoni A; Villani P; Broquet A; Alborghetti M; Bonafe U; Calzolari F; Duchi R; Landi T C; Verza G P; Vuillermoz E; Bonasoni P

来源：Atmospheric Environment, 2014, 97: 75-82.

DOI：10.1016/j.atmosenv.2014.07.063

• Surface ozone
• Aerosol particles
• Carbon dioxide
• Karakorum
• Anthropogenic pollution

In this work we provide an overview of short lived climate forcers (SLCFs) and carbon dioxide variability in the Karakorum, by presenting results deriving from a field campaign carried out at Askole (3015 m a.s.l., Pakistan Northern Areas), by Baltoro glacier. By using an innovative embedded and transportable system, continuous measurements of aerosol particle number concentration (Np, 1571 +/- 2670 cm(-3)), surface ozone (O-3, 31.7 +/- 10.4 nmol/mol), carbon dioxide (CO2, 394.3 +/- 6.9 mu mol/mol) and meteorological parameters have been performed from August 20th to November 10th 2012. The domestic combustion from the Askole village emerged as a possible systematic source of contamination in the valley, with short-lasting pollution events probably related to domestic cooking activities characterized by high values of Np (6066 +/- 5903 cm(-3)). By excluding these local contamination events, mountain thermal wind regime dominated the diurnal variability of Np, O-3 and CO2. In comparison to night-time, we observed higher Np (+354 cm(-3)) and O-3 (+7 nmol/mol) but lower CO2 (-8 mu mol/mol) in air-masses coming from the lower valley during the central part of the day. Part of the day-to-day atmospheric composition variability can be also ascribed to synoptic circulation variability, as observed by using HYSPLIT 5-day back-trajectories.

• 出版日期2014-11