Aerosol number concentration

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.
 
Citation proposal
(2011) . Aerosol number concentration. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/e696aa9e-ff84-41c5-a6fa-869332dfb02f
 

Identification

Data identification

Citation

Date ( Publication )
2011-04-01T19:01:00
Purpose
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.
Status
Completed

  Point of contact

  +39 035 3230551 
Website
http://www.evk2cnr.org/  

  Point of contact

  +39 051 639 9652 

  Principal investigator

  +39 051 6399652 
Maintenance and update frequency
As needed
Keywords
  • SHARE , Network , Station , High Altitude
Keywords
  • WMO , GAW , GAWSIS
Keywords
  • CEOP
Keywords ( Theme )
  • climate , air , climate , natural areas , landscape , ecosystems , pollution , research
Keywords ( Theme )
  • aerosol , aerosol number concentrations
Keywords ( Place )
  • Nepal , Himalaya

Legal constraints

Use limitation
No conditions apply
Access constraints
Copyright
Other constraints
Character set
UTF8
Topic category
  • Climatology, meteorology, atmosphere
  • Environment
  • Geoscientific information
N
S
E
W


Supplemental Information
 

Distribution

Distribution

Digital transfer options

OnLine resource
SHARE Geonetwork portal  

SHARE Geonetwork portal

OnLine resource
ISAC EVK2-Nepal Climate Observatory - Pyramid website  

ISAC EVK2-Nepal Climate Observatory - Pyramid website

OnLine resource
GAWSIS (Global Atmosphere Watch Station Information System) report about Nepal Climate Observatory - Pyramid  

GAWSIS (Global Atmosphere Watch Station Information System) report about Nepal Climate Observatory - Pyramid

OnLine resource
Official website of CEOP-HE (Coordinated Energy and water cycle Observation Project - High Elevation)  

Official website of CEOP-HE (Coordinated Energy and water cycle Observation Project - High Elevation)

OnLine resource
Spectrometr190.pdf  

Product Information OPC GRIMM190

OnLine resource
gaw153.pdf  

WMO/GAW No. 153 "AEROSOL MEASUREMENT PROCEDURES GUIDELINES AND RECOMMENDATIONS".

 

Quality

Data quality

Hierarchy level
Series

Accuracy of time measurement

Name of measure
time resolution
Measure description
TIME INTERVAL:continuos
Evaluation method description

Conformance result

Citation

Date ( Creation )
Explanation

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.

Pass
true
Statement
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.
 

Spatial rep.

Vector spatial representation

Topology level
Geometry only

Geometric objects

Geometric object type
Point
Geometric object count
1
 

Ref. system

Reference system identifier
EPSG / WGS 84 (EPSG:4326) / 7.4
 

Metadata

Metadata

File identifier
e696aa9e-ff84-41c5-a6fa-869332dfb02f   XML
Metadata language
eng
Character set
UTF8
Parent identifier
b5937a39-1917-4034-bd65-a0a88fae6c89
Hierarchy level
Series
Date stamp
2011-09-26T10:52:32
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

  Point of contact

  +39 035 3230551 
Website
http://www.evk2cnr.org  
 
 

Md. constraints

Use limitation
No conditions apply
 

Md. maintenance

Maintenance information

Maintenance and update frequency
As needed
Update scope
Series
 

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