Aerosol optical thickness

Sun photometer ( Cimel CE-318) measurements of the direct (collimated) solar radiation provide information to calculate the columnar aerosol optical depth (AOD). AOD can be used to compute columnar water vapor (Precipitable Water) and estimate the aerosol size using the Angstrom parameter relationship. Sunphotometer from March 2006 provides a characterization of aerosol optical and microphysical properties of the air column above the station. It is an automatic sun-tracking and sky radiometer for measuring the aerosol optical depth at 8 wavelengths between 340 and 1020 nm.

Citation proposal
(2011) . Aerosol optical thickness. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/0e978533-38bb-4f44-a83f-b7f54907d613

Simple

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

Purpose: Measurements from a Cimel CE 318 sun photometer is part of the AERONET project, sun photometer data and specifications can be downloaded from the AERONET web site (http://aeronet.gsfc.nasa.gov, station EVK2-CNR). These measurements allow to follow the time evolution of the aerosol optical depth (AOD) at eight wavelengths, plus other properties as single scattering albedo (SSA, fundamental in computing the aerosol effects on solar radiation), particle size distribution (SD, fundamental in assessing the ABC effects on formation and lifetime of water vapor clouds) and refractive index.

Status: On going

Point of contact

Ev-K2-CNR - ( )

Via San Bernardino 145 Bergamo BG 24126 Italy

+39 035 3230511

+39 035 3230551

Website: http://www.evk2cnr.org/

Point of contact

Institute of Atmospheric Sciences and Climate (ISAC) - CNR - Paolo Bonasoni ( )

Via Gobetti 101 Bologna BO 40129 Italy

+39 051 639 9590

+39 051 639 9652

Principal investigator

Institute of Atmospheric Sciences and Climate (ISAC) National Research Council - Gian Paolo Gobbi ( )

Via Fosso del Cavaliere, 100 Roma Roma 00133 Italy

+39 06 49934343

+39 06 20660291

Maintenance and update frequency: As needed

Keywords

SHARE , Network , Station , High Altitude

Keywords

AERONET , GAW , GAWSIS , WMO , CEOP

Keywords ( Theme )

air , pollution , ecosystems , climate , natural areas , landscape

Use limitation: No conditions apply

Access constraints: Copyright

Other constraints

Character set: UTF8

Topic category

Climatology, meteorology, atmosphere
Environment
Geoscientific information

Supplemental Information

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

Topology level: Geometry only

Geometric object type: Point

Geometric object count: 1

OnLine resource: SHARE Geonetwork portal
SHARE Geonetwork portal

OnLine resource: man_ce318_us.pdf
User Manual CE-318

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

gaw153.pdf

No. 153 WMO/GAW :

"AEROSOL MEASUREMENT PROCEDURES

GUIDELINES AND RECOMMENDATIONS"

Hierarchy level: Series

Statement: Aerosol optical depth (AOD) is not directly measurable, but rather must be retrieved from observations of atmospheric spectral transmission. The AERONET network [Holben et al., 1998, 2001]) is a major global network measuring AOD. It involves a consortium of partners operating up to 100 radiometers on a routine or campaign basis. A sun photometer from CIMEL is widely used in the AERONET network.