e696aa9e-ff84-41c5-a6fa-869332dfb02f eng b5937a39-1917-4034-bd65-a0a88fae6c89 Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy evk2cnr@evk2cnr.org http://www.evk2cnr.org 2011-09-26T10:52:32 ISO 19115:2003/19139 1.0 1 WGS 84 (EPSG:4326) EPSG 7.4 Aerosol number concentration 2011-04-01T19:01:00 PM is measured using the optical particle counter (OPC GRIMM 190), which measures the size distributions for particle with diameters greater than 0.25 up to 32µm by means of 90° laser light scattering. The Aerosol number concentration measurement is a subset of core variables that are recommended by the GAW Scientific Advisory Group on Aerosols for long-term measurements in the global network. Aerosol particles are ubiquitous in the atmosphere. They exert significant effects on the Earth’s climate. First, they absorb and scatter incoming solar radiation (direct radiative forcing). Second, they act as cloud condensation nuclei (CCN), influencing the cloud microphysical and optical properties as well as their life-time and precipitation (indirect effect). Due to the high variability of the natural as well as the anthropogenic aerosol in the troposphere, the corresponding radiative effects vary highly in time and space. The latest report from IPCC has shown that atmospheric aerosols represent the largest uncertainty in understanding and giving future predictions of the Earth’s climate. Aerosol number concentration varies greatly in both, time and space. Meanwhile, the existing in-situ aerosol observation system is patchy with respect to global coverage, very little information are available especially remote environment and in free troposphere. Ev-K2-CNR +39 035 3230511 +39 035 3230551 Via San Bernardino 145 Bergamo BG 24126 Italy evk2cnr@evk2cnr.org http://www.evk2cnr.org/ Paolo Bonasoni Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 051 639 9590 +39 051 639 9652 Via Gobetti 101 Bologna BO 40129 Italy p.bonasoni@isac.cnr.i Angela Marinoni Institute of Atmospheric Sciences and Climate (ISAC) - CNR +39 051 6399597 +39 051 6399652 Via Gobetti 101 Bologna BO 40129 Italy a.marinoni@isac.cnr.it https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=e696aa9e-ff84-41c5-a6fa-869332dfb02f&fname=Piramide_s.png thumbnail png https://geoportal.mountaingenius.org/geonetwork/srv/eng/resources.get?uuid=e696aa9e-ff84-41c5-a6fa-869332dfb02f&fname=Piramide.png large_thumbnail png SHARE Network Station High Altitude WMO GAW GAWSIS CEOP climate air climate natural areas landscape ecosystems pollution research aerosol aerosol number concentrations Nepal Himalaya No conditions apply climatologyMeteorologyAtmosphere environment geoscientificInformation 80.0522 88.1946 26.3684 30.4247 https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=106&fname=&access=private WWW:LINK-1.0-http--link SHARE Geonetwork portal http://evk2.isac.cnr.it/ WWW:LINK-1.0-http--partners ISAC EVK2-Nepal Climate Observatory - Pyramid website http://gaw.empa.ch/gawsis/reports.asp?StationID=-739518674 WWW:LINK-1.0-http--partners GAWSIS (Global Atmosphere Watch Station Information System) report about Nepal Climate Observatory - Pyramid http://www.ceop-he.org/cms/ WWW:LINK-1.0-http--partners Official website of CEOP-HE (Coordinated Energy and water cycle Observation Project - High Elevation) https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=151&fname=Spectrometr190.pdf&access=private WWW:DOWNLOAD-1.0-http--download Spectrometr190.pdf Product Information OPC GRIMM190 https://geoportal.mountaingenius.org/webapp/srv/en/resources.get?id=151&fname=gaw153.pdf&access=private WWW:DOWNLOAD-1.0-http--download gaw153.pdf WMO/GAW No. 153 "AEROSOL MEASUREMENT PROCEDURES GUIDELINES AND RECOMMENDATIONS". time resolution TIME INTERVAL:continuos time resolution The final data reporting protocols for the GAW aerosol data must be prepared in coordination with groups responsible for the other parameters measured at GAW sites. For continuously measured aerosol parameters, one-hour time resolution is appropriate with a measure of the central value (arithmetic mean) and variability (standard deviation) reported for each parameter for each hour. true Measurement data from March 2006 are recorded at the station Nepal Climate Observatory at Pyramid in the Himalaya (Nepal, 5059 m asl) are part of ABC-DISC database, maintained by UNEP (United Nations Environmental Programme). Optical Particle Counter (OPC, GRIMM 190) determining the aerosol size distribution for particle diameters from 0.25 up to 32 µm in 31 channels, with an accuracy of 2%, on concentrations. Coarse particles, with diameters larger than 1 µm are considered as a proxy of dust aerosol. From the OPC measurements the mass concentrations of PM1 were derived. Due to instrument failure, the measurements were interrupted on 4 December 2007 and resumed on 5 February 2008. No conditions apply