Multi-angle Absorption Photometer

The Multi Angle Absorption Photometer MAAP (MAAP 5012, Thermo Electron Corporation) is installed at the Nepal Climate Observatory - Pyramid for the measurement of the Black Carbon concentration unit [ng/m3].
 
Citation proposal
(2011) . Multi-angle Absorption Photometer. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/e9ec062a-f1f2-49b2-9582-c50987c3e73b
 

INSPIRE

Identification

File identifier
e9ec062a-f1f2-49b2-9582-c50987c3e73b   XML
Hierarchy level
Series
Online resource
Protocol
WWW:LINK-1.0-http--link
Protocol
WWW:LINK-1.0-http--partners
Protocol
WWW:LINK-1.0-http--partners
Protocol
WWW:LINK-1.0-http--partners
Protocol
WWW:DOWNLOAD-1.0-http--download
Resource identifier
Encoding
Projection
code
WGS 84 (EPSG:4326)
 

Classification of data and services

Topic category
  • Climatology, meteorology, atmosphere
  • Environment
  • Geoscientific information
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Keywords

Other keywords
Keywords
  • SHARE , Network , Station , High Altitude
Keywords
  • WMO , GAW
Keywords
  • CEOP
Keywords ( Place )
  • Nepal
Keywords ( Theme )
  • aerosol , black carbon
Keywords ( Theme )
  • air , research , pollution , ecosystems , landscape , natural areas , climate
 
 

Geographic coverage

N
S
E
W


 

Temporal reference

Temporal extent
Temporal extent
Date ( Publication )
2011-04-01T19:01:00
 

Quality and validity

Lineage
The Thermo Scientific Multi-Angle Absorption Photometer (MAAP) - 5012 Model measures loading of black carbon in the atmosphere using a radiative transfer scheme to particle loaded glass fiber filters. The MAAP is based on the principle of aerosol-related light absorption and the corresponding atmospheric equivalent black carbon (EBC) mass concentration. The Model 5012 uses a multi angle absorption photometer to analyze the modification of scattering and absorption in the forward and backward hemisphere of a glass-fibre filter caused by deposited particles. The internal data inversion algorithm of the instrument is based on a radiation transfer model and takes multiple scattering processes inside the deposited aerosol and between the aerosol layer and the filter matrix explicitly into account (see Petzold et al., 2004).The sample air is drawn into the MAAP and aerosols are deposited onto the glass fibre filter tape. The filter tape accumulates the aerosol sample until a threshold value is reached, then the tape is automatically advanced. Inside the detection chamber a 670-nanometer light emitting diode is aimed towards the deposited aerosol and filter tape matrix. The light transmitted into the forward hemisphere and reflected into the back hemisphere is measured by a total of five photo-detectors. During sample accumulation, the light intensities at the different photo-detectors change compared to a clean filter spot. The reduction of light transmission, change in reflection intensities under different angles and the air sample volume are continuously measured during the sample period. With these data and using its proprietary radiation transfer scheme, the MAAP calculates the equivalent black carbon concentration (EBC) as the instruments measurement result. Using the specific absorption cross section ðBC = 6.6 m2/g of black carbon at the operation wavelength of 670 nm, the aerosol absorption at that wavelength can be readily calculated.
 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
 

Restrictions on access and use

Access constraints
 

Restrictions on access and use

 

Responsible organization (s)

Contact for the resource
Organisation name
Ev-K2-CNR
Email
evk2cnr@evk2cnr.org
Organisation name
Institute of Atmospheric Sciences and Climate (ISAC) - CNR
Email
p.bonasoni@isac.cnr.it
Organisation name
Institute of Atmospheric Sciences and Climate (ISAC) - CNR
Email
a.marinoni@isac.cnr.it
 

Responsible organization (s)

Contact for the resource
Organisation name
Ev-K2-CNR
Email
evk2cnr@evk2cnr.org
Organisation name
Institute of Atmospheric Sciences and Climate (ISAC) - CNR
Email
p.bonasoni@isac.cnr.it
Organisation name
Institute of Atmospheric Sciences and Climate (ISAC) - CNR
Email
a.marinoni@isac.cnr.it
 

Metadata information

Contact for the metadata
Organisation name
Ev-K2-CNR
Email
metadata@evk2cnr.org
Date stamp
2011-09-26T14:24:26
Metadata language
eng
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Coordinate reference system
 
Quality of Service
 
Access constraints
Limitation
 
Use constraints
Limitation
 
Responsible custodian
Contact for the resource
 
 

Conformance class 3: harmonized

 
 

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