Picarro G2401 (CO2)

Le concentrazioni di anidride carbonica sono misurate utilizzando l’analizzatore PICARRO G2401; tale strumento si basa sulla tecnologia Cavity-Ring-Down Spectroscopy (CRDS) che, dall’analisi dell’attenuazione di un segnale laser su un cammino ottico di 20 km, permette di valutare in modo accurato e selettivo le concentrazione dei gas. Lo strumento è stato tarato sulla base di miscele di taratura fornite dal World Calibration Center (NOAA-GMDL) della rete WMO/GAW. Ogni 48 ore vengono eseguite tarature di routine utilizzando working standard commerciali

Instrument (Picarro G2401) is used to determine atmospheric carbon dioxide. The instrument is connected by a Synflex 1300 (OD: ¼”) to the air intake manifold. Antiparticulate filter (Svagelock) are present at the instrument inlet.

Scale and calibration: WMO-CO2-X2007.

Once the implementation phase will be ended (end of summer 2015), two working standards will be used for automatic calibration every 48h. These working standard will be calibrated every month against two travelling/secondary standards which, on turn, will be calibrated, every six months against NOAA – GMDL reference cylinders (CB11039, CB11164, CB10928) hosted at the twin station “Lamezia Terme” and representing the laboratory primary standard. The working and secondary standards have CO2 mole fractions representing upper and lower ranges of the expected ambient variability.

Working standards (50 lt, Alluminum tanks at 150bar) and travelling standards (10 lt, Aluminum tanks at 150 bar) are provided by RIVOIRA (Praxair). Two-stage stainless steel pressure regulators for high purity gas are used (Praxiar RSD2SX).

Currently and until the end of the implementation phase, manual calibration against the two working standard is carried out every 14days/1month by ISAC-CNR operators. The link to the NOAA-GMDL standard at Lamezia Terme is still not effective, thus currently the instrument is running with factory calibration parameter.

Data are recorded on a 5 sec basis by the Picarro internal PC and mirrored to a station server , then delivered in NRT mode to ISAC-CNR HQs in Bologna, where 1-minute average were calculated. Final aggregation to hourly average will be executed by using validated 1-min data.

On hourly basis data will be flagged to identify “background” observations. This can be done both by considering wind sector (with the aim of selecting observations under sea breeze conditions, thus neglecting influence from in-land contributions) as well as by using de-spiking procedures as proposed by Thoning et al. [1989] .

Information about instrument functioning and intervention are stored within an e-logbook. Instrument manual are present at the station.

SOP are extracted by the: GAW Report No. 185 “Guidelines for the Measurement of Methane and Nitrous Oxide and their Quality Assurance”, GAW Report No. 192 “Guidelines for the Measurement of Atmospheric Carbon Monoxide”; GAW Report No. 213 “17th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques”.

 
Citation proposal
(2013) . Picarro G2401 (CO2). https://geoportal.mountaingenius.org/geonetwork/srv/api/records/df71d624-31c1-4a33-8ba4-e7e34067001b
 

INSPIRE

Identification

File identifier
df71d624-31c1-4a33-8ba4-e7e34067001b   XML
Online resource
Protocol
WWW:LINK-1.0-http--link
Protocol
Protocol
OGC:WMS-1.1.1-http-get-map
Resource identifier
Metadata language
eng
Spatial representation type
Vector
Encoding
Projection
code
WGS 1984
 

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Topic category
  • Boundaries
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Carbon dioxide
Other keywords
Keywords ( Theme )
  • I-AMICA
Keywords ( Place )
  • Italy
Keywords ( Theme )
  • anidride carbonica
Keywords ( Place )
  • Sicily
Keywords ( Theme )
  • Sicilia
Keywords ( Place )
  • Italia
Keywords ( Place )
  • Capo Granitola
 
 

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N
S
E
W


 

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Temporal extent
Date ( Publication )
2013-05-20T10:26:00
 

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Lineage
 

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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
CNR - ISAC
Email
m.busetto@isac.cnr.it
Organisation name
CNR - ISAC
Email
p.cristofanelli@isac.cnr.it
 

Responsible organization (s)

Contact for the resource
Organisation name
CNR - ISAC
Email
m.busetto@isac.cnr.it
Organisation name
CNR - ISAC
Email
p.cristofanelli@isac.cnr.it
 

Metadata information

Contact for the metadata
Organisation name
Email
Date stamp
2015-05-06T09:16:54
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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