dbfadbca-d5bd-4e7b-bdd5-19829b4ab8fd eng 2f8f7474-e97d-4ba4-bb6a-424b05b23adb Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy metadata@evk2cnr.org http://www.evk2cnr.org/ 2012-04-02T09:04:38 ISO 19115:2003/19139 1.0 Sunphotometry of the 2006–2007 aerosol optical/radiative properties at the Himalayan Nepal Climate Observatory-Pyramid (5079 m a.s.l.) ACP - Special Issue 2010-11-29T00:00:00 Atmospheric Chemistry and Physics,10 Special Issue"Atmospheric brown cloud in the Himalayas." 11209–11221 Atmospheric Chemistry and Physics,10, 11209-11221, 2010 Special Issue"Atmospheric brown cloud in the Himalayas" 1680-7316 In spite of being located at the heart of the highest mountain range in the world, the Himalayan Nepal Climate Observatory (5079 m a.s.l.) at the Ev-K2-CNR Pyramid is shown to be affected by the advection of pollution aerosols from the populated regions of southern Nepal and the Indo-Gangetic plains. Such an impact is observed along most of the period April 2006–March 2007 addressed here, with a minimum in the monsoon season. Backtrajectoryanalysis indicates long-range transport episodes occurring in this year to originate mainly in the west Asian deserts. At this high altitude site, the measured aerosol optical depth is observed to be about one order of magnitude lower than the one measured at Ghandi College (60 m a.s.l.), in the IndoGangetic basin. As for Ghandi College, and in agreement with the in situ ground observations at the Pyramid, the fine mode aerosol optical depth maximizes during winter and minimizes in the monsoon season. Conversely, total optical depth maximizes during the monsoon due to the occurrence of elevated, coarse particle layers. Possible origins of these particles are wind erosion from the surrounding peaks and hydrated/cloud-processed aerosols. Assessment of the aerosol radiative forcing is then expected to be hampered by the presence of these high altitude particle layers, which impede an effective, continuous measurement of anthropogenic aerosol radiative properties from sky radiance inversions and/or ground measurements alone. Even though the retrieved absorption coefficients of pollution aerosols were rather large (single scattering albedo of the order of 0.6–0.9 were observed in the month of April 2006), the corresponding low optical depths (0.03 at 500 nm) are expected to limit the relevant radiative forcing. Still, the high specific forcing of this aerosol and its capability of altering snow surface albedo provide good reasons for continuous monitoring. Copernicus GmbH (Copernicus Publications) +49 5519003390 +49 55190033970 Bahnhofsallee 1e Göttingen 37081 Germany info@copernicus.org http://www.copernicus.org WWW:LINK-1.0-http--related Gian Paolo Gobbi Institute of Atmospheric Sciences and Climate ISAC-CNR CNR +39 0649934343 +39 0620660291 Via del Fosso del Cavaliere, 100 Roma ROMA 00133 Italy g.gobbi@isac.cnr.it www.isac.cnr.it WWW:LINK-1.0-http--partners Federico Angelini Institute of Atmospheric Sciences and Climate (ISAC)-CNR +39 0649934340 Via del Fosso del Cavaliere, 100 Roma Roma 00133 Italy f.angelini@isac.cnr.it http://www.isac.cnr.it/ WWW:LINK-1.0-http--partners Paolo Bonasoni Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0516399590 +39 0516399652 Via Gobetti,101 Bologna BO 40129 Italy p.bonasoni@isac.cnr.it http://www.isac.cnr.it/ WWW:LINK-1.0-http--partners Angela Marinoni Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 0516399597 +39 0516399652 Via Gobetti,101 Bologna BO 40129 Italy a.marinoni@isac.cnr.it http://www.isac.cnr.it/ WWW:LINK-1.0-http--partners Francesca Barnaba Institute of Atmospheric Sciences and Climate (ISAC)-CNR +39 0649934282 Via del Fosso del Cavaliere, 100 Roma ROMA 00133 Italy F.Barnaba@isac.cnr.it www.isac.cnr.it Gian Pietro Verza Ev-K2-CNR Via San Bernardino, 145 Bergamo BG 24126 Italy gianpietro.verza@evk2cnr.org www.evk2cnr.org https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=dbfadbca-d5bd-4e7b-bdd5-19829b4ab8fd&fname=mountain_witness__s.png thumbnail png Atmospheric Brown Clouds Himalayas Nepal Climate Observatory-Pyramid Nepal AERONET SHARE ABC GAW sunphotometer aerosol optical properties aerosol radiative properties aerosol eng climatologyMeteorologyAtmosphere environment 80.0522 88.1946 26.3684 30.4247 http://www.atmos-chem-phys.net/special_issue162.html WWW:LINK-1.0-http--link The book contains the scientific papers published by EvK2Cnr researchers in a special issue of Atmospheric Chemistry and Physics, entitled "Atmospheric brown clouds in the Himalayas " http://www.atmos-chem-phys.org/10/11209/2010/acp-10-11209-2010.pdf WWW:LINK-1.0-http--related Abstract:"Sunphotometry of the 2006–2007 aerosol optical/radiative properties at the Himalayan Nepal Climate Observatory-Pyramid (5079 m a.s.l.)". https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=1673&fname=acp-10-11209-2010.pdf&access=private WWW:DOWNLOAD-1.0-http--download acp-10-11209-2010.pdf Full Text(pdf):"Sunphotometry of the 2006–2007 aerosol optical/radiative properties at the Himalayan Nepal Climate Observatory-Pyramid (5079 m a.s.l.)" The book contains the scientific papers by EvK2Cnr researchers in a special issue of Atmospheric Chemistry and Physics, entitled "Atmospheric brown clouds in the Himalayas " "Sunphotometry of the 2006-2007 aerosol optical/radiative properties at the Himalayan Nepal Climate Observatory-Pyramid (5079 m a.s.l.)". G. P. Gobbi, F. Angelini, P. Bonasoni, G. P. Verza, A. Marinoni, and F. Barnaba. Atmos. Chem. Phys., 10, 11209-11221, 2010.