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 Organization

NO 37
Acronym ISAC
Name National Research Council, Institute of Atmospheric Sciences and Climate
Address 1
Address 2
Address 3 Via Piero Gobetti, 101 40129 BOLOGNA (IT)
Country/Territory Italy
Website http://www.isac.cnr.it

 Contact(s)

Name Giorgio Tranchida
Prefix
Email giorgio.tranchida@cnr.it
Organization No 138
Organization acronym IASCNR
Organization name Istituto per lo studio degli impatti Antropici e Sostenibilità in ambiente marino
Organization country/territory Italy
Address 1
Address 2
Address 3
Country/territory Italy
Tel +39 0924 40600
Fax +39 0924 40445
Last updated date 2019-07-31


Name Giovanni Giacalone
Prefix
Email giovanni.giacalone@cnr.it
Organization No 138
Organization acronym IASCNR
Organization name Istituto per lo studio degli impatti Antropici e Sostenibilità in ambiente marino
Organization country/territory Italy
Address 1
Address 2
Address 3
Country/territory Italy
Tel +39 0924 40600
Fax +39 0924 40445
Last updated date 2019-07-31


Name Paolo Cristofanelli
Prefix
Email p.cristofanelli@isac.cnr.it
Organization No 37
Organization acronym ISAC
Organization name National Research Council, Institute of Atmospheric Sciences and Climate
Organization country/territory Italy
Address 1
Address 2
Address 3 ISAC-CNR, VIa Gobetti 101 - 40129 Bologna, Italy
Country/territory Italy
Tel +39 051 6399652
Fax +39 051 6399652
Last updated date 2019-07-31


NO 138
Acronym IASCNR
Name Istituto per lo studio degli impatti Antropici e Sostenibilità in ambiente marino
 Monitoring background conditions, and the influence of air pollution
 UTC+01:00
 ppb
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: Picarro G2401 (S/N: CFKADS2152-20141128)(CRDS)
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: 4 (m)
 5 seconds
 Until 2016, the CGR system was manually calibrated every three months by using a set of 6 commercial standards (synthetic air) traced back to a set of n.3 calibration standard from NOAA-GMDL (CB11039, CB11164, CB10928). Each calibration event included three single injections (60 minute each). Starting from 2017, a NOAA-GMDL standard (ND01759, provided by ENEA, Laboratory for Observations and Analyses of Earth and Climate, Lampedusa.) was available at CGR and was used to calibrate the measurements each month (each week starting from 2018) by scaling the measured concentration. To minimise the mixture consumption, a single injection is performed every week (duration: 45 minutes). The injection of standard is followed by the injection (45 minutes each) of two target gases (real air matrix).
 Data are recorded on a 5 s basis by the Picarro internal PC and mirrored to a station server, then delivered in NRT mode to ISAC-CNR HQ in Bologna, where 1-minute averages were calculated. An outlier rejection methodology (based on that described by El Yazidi et al., AMT, 2018) is applied to the 1-minute time series before calculation of hourly average values. On an hourly basis standard deviation values data were flagged to identify local contamination (see Data Quality Flag).

For all the instruments and Observatories, information on instrument functioning and intervention are stored in an e-logbook.

1-minute data and metadata are visually inspected on a daily basis by an HTML page reporting the last 48h of available measurements and instrumental internal parameters. Data and metadata are further analyzed on a monthly/seasonal/quaterly basis.
Final aggregation to hourly average are executed using validated 1-minute data (i.e. by excluding calibration records, missed records and local-contaminated records).

Quality assurance procedures involve time series plots, consistency checks on co-variability with other gas parameters, meteorology and aerosol for special events.
 [Hourly] Hourly data were obtained by averaging 1-minute average mean values not affected by local contamination data ("...E" flag).
 [Daily] Daily mean values were calculated by averaging hourly mean values with no local contamination ("...E" or "...B" flags).
 [Monthly] Monthly mean values were obtained by averaging daily mean data with at least 12 hourly values.
 YEAR 2015-2016
"I..." missed data
"...E" data rejected for local contamination (hourly CH4 standard deviation higher than 40 ppb)
".V.." large variability of CH4 within one hour (hourly CH4 standard deviation larger than 10 ppb)
"...B" data affected by biogenic local contamination (hourly CH4 standard deviation higher than 10 ppb but lower than 40 ppb)
"..L." data recorded under land breeze wind regime
"..S." data recorded under sea breeze wind regime

YEAR 2017- onwards
Flag 0.390 indicates data completeness under 50% for 1-hour mean value calculation.
Flag 0.460 indicates local contamination.
Flag 0.559 indicates not-background influence.
Flag 0.999 indicates missing data,
 Invalid: 0.9990
 Valid (background): 0.0000
 Valid: 0.5590
 Valid: 0.3900
 Valid: 0.4600
 Invalid: I...
 Valid: ..L.
 Invalid: ...E
 Valid: .VLB
 Valid: .VL.
 Valid (background): ..S.
 Valid: .VSB
 Valid: .VS.
 Valid (background): ....
 Valid: .V..
 Invalid: I..
 Valid: .L.
 Valid (background): .S.
 Valid: .LV
 Valid: .SV
 Valid (background): ...
 Valid: ..V
 Valid: .VDL
 Valid: .V.L
 Valid: .VDS
 Valid: ..DS
 Valid: ..DL
 Valid (background): ...S
 Valid: ...L
 Valid: .V.S
 Valid: ..D.
 Valid: .VD.
 Operational/Reporting
 Capo Granitola Observatory is located along the southern Sicily coastline facing the Strait of Sicily, at Torretta Granitola (12 km from Mazara del Vallo, 52,000 inhabitants), within the scientific campus of the Institute for the Marine-Coastal Environment (CNR-IAMC). CGR location is affected by the sea-land breeze regime, with prevailing gentle wind breezes (up to 4 m/s) from inland (NW-NE) during the night and prevailing winds from the sea (W-SE) during daytime.
Biogenic (oxic) emissions from algae accumulated along the coastline, lead the occurrence of events characterized by enhanced CH4 values and variability.
CH4 observations are performed with a commercially available instrument (Picarro Inc. G2401) based on the Wavelength-Scanned Cavity Ringdown Spectroscopy technique coupled to a custom-built calibration unit. Along with CH4, the instrument is also capable to measure CO, CO2 and H2O. Thus, the CH4 data can be corrected for interferences of remaining water traces. CH4 reading were further corrected for water vapor intereference by using the empirical humidity correction provided by Chen et al. AMT, 2010.
The air intake is composed of a Teflon tube (length: 2600 mm) with 50 mm inner diameter. An upper hood (Teflon-coated) is used to prevent rain penetration inside the sampling intake. Air is sampled 1.5 m above the station roof. Internal temperature and relative humidity are continuously monitored and temperature is keep 4 Celsius degrees higher than ambient temperature to prevent condensation. Flow is maintained constant minimizing (below 5 s) the residence time of sampling inside the air intake. Flow as well as internal T and RH are continuously monitored and recorded by the acquisition system.
1/4” (OD) Synflex 1300 tubes is used to connect the air intake manifold.
 Wind direction:
 Wind speed:
 Relative humidity:
 Precipitation amount:
 Air pressure:
 Air temperature:
 Dew point temperature:
 Sea water temperature:
 Sea surface water temperature:
 Sea water salinity:
 Sea surface water salinity:
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
 
1  Cristofanelli P, Busetto M, Calzolari F, Ammoscato I, Gullì D, Dinoi A, et al.. Investigation of reactive gases and methane variability in the coastal boundary layer of the central Mediterranean basin. Elem Sci Anth. 2017;5:12. DOI: http://doi.org/10.1525/elementa.216