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puy de Dôme station

The puy de Dôme Research Station is a global Gaw site.

The puy de Dôme station (PUY, 45 46N, 2 57E, 1465 m asl.) is operatedby CNRS and University Blaise Pascal Clermont Ferrand within the framework of the national atmospheric chemistry network. PDD is located a few tens of km from local sources of pollution and the air is representative of the synoptic-scale atmospheric composition of the regional atmospheric background.

Puy de Dôme is the highest point of the Chaîne des Puys, which comprises 80 volcanoes aligned north to south on a 3 to 5 km wide strip of land, a little over 45 kilometres in length. The station is exposed to an oceanic climate. It is surrounded by a protected area where fields and forests are predominant. The city of Clermont-Ferrand (150 000 inhabitants) is located 16 km east of the station at 396m a.s.l. Previous work at the station shows that the influence of the city on the puy de Dôme measurements remains undetectedand that the station is representative of the regional background (Asmi  et al. 2011 ; Henne et al., 2010). During winter/spring time and all year during nighttime, LIDAR measurements show that the station lies in the free troposphere/residual layer and air masses are exempt from the influence of local pollution

Infrastructure : Station is situated at the top of the puy de Dôme non-active volcano.

It is easily accessible by road for the personal working at the station, and since June 2012 by an electric train.

 

The PUY station is a high altitude station located at the top of the first mountain chain facing prevailing western winds, It is a single narrow chain orientated North-South (Figure 4). This simple topography generates fewer modifications of the general air flow then in larger mountain chains such as the Alps in Europe. This feature leads to an absence of valley winds, observed in more complex topographies, which permits to sample air masses often representative of the altitude at which the station is located. Consequently, the station was observed to lay in the free troposphere also during the day, which permitted to study daytime processes such as nucleation in this part of the atmosphere which is difficult to sample unambiguously. PUY measurements were used for evaluating global climate models (Spracklen et al. 2011, Reddington et al. 2012).
The PUY station is one of the very few high altitude stations worldwide measuring a complete set of in situ measurements of the gas and particulate phases, coupled with a co-located LIDAR and sun photometer measurements at its base. This configuration allows for the identification of the part of the atmosphere that the station is sampling (Planetary Boundary Layer, Lower Free troposphere, Nocturnal residual layer, Interfaces). This has led to significant scientific advances, such as the evidence that nucleation is promoted at the top of the PBL/Lower Free Troposphere (Boulon et al. 2012).

 

Topography of the puy Mountain chain,with the localisation of the PDD station

- At last, the PDD research site is in cloud approximately 50% of the time between November and March, which allows for aerosol-cloud interaction studies. Since june 2010, two different types of stainless steel inlets have been installed; a whole air inlet capable of sampling cloud droplets together with interstitial (non-activated) particles (whole air inlet (WAI)), and a second inlet capable of sampling only interstitial particles. These inlets provide the means to measure the chemical and physical properties of CCN (Asmi et al. 2012). The opportunity to sample natural clouds drove yearly intensive campaigns for aerosol-cloud interactions studies since 2008, with international groups participations.

References and publications related to PDD measurements

 

Instrumentation at the station

  1. Please fill in the table for the variables measured at the station:

Variable

Method (Instrument)

Period of measurements : since

Notes (e.g. if you send air sample for analysis in the other lab)

Data submission

carbon monoxide (CO)

Infrared absorption

April-2002

5 mn

EMEP since 2007

sulphur dioxide (SO2)

UV fluorescence

Jan-2003

5 mn

EMEP since 2007

nitrogen monoxide (NO)

chemiluminescence

Jan -2003

5 mn

EMEP since 2007, ACTRIS

nitrogen dioxide (NO2)

chemiluminescence

Jan -2003

5 mn

EMEP since 2007, ACTRIS

total reactive nitrogen(NOy)

chemiluminescence

Jul -2011

5 mn

ACTRIS

surface ozone (O3)

UV  absorption

Jan -1995

5 mn

EMEP since 2007, EUSAAR

CO2

Spectroscopy

Jan-2005

5 mn

, ICOS

CO2, CO, O2, H2O

off-line Canisters

Jan-2005

Once a week, sent to LSCE, France

, ICOS

C13/12 in CO2

off-line Canisters

Jan-2005

University of Bern

ICOS

CO2, CH4, N2O, SF6

on line GC FID and ECD

July-2010

5 mn

, ICOS

volatile organic compounds (VOC)

off-line Cartridges + GCMS

Nov-2011

Twice a week

ACTRIS

HCHO

Aerolaser 4021

Nov-2011

Intensive observation period

ACTRIS

J(NO2)

Filter radiometer

Jan-2003-Mar-2007

5 mn

OPGC

aerosol light scattering coefficient (three lambda)

integrated nephelometer

June-2009

5 mn

EMEP, EUSAAR, ACTRIS

aerosol absorption coefficient

MAAP

Sept-2000

5 mn

EMEP, EUSAAR, ACTRIS

EC, OC, TC

Low volume sampler

June-2009

Once a week

EMEP, EUSAAR, ACTRIS

major ions

Low volume sampler

July-2009

Once a week

EUSAAR, ACTRIS

Aerosol Number Concentration

CPC

Dec-2005

5 mn

EMEP, EUSAAR, ACTRIS

Aerosol Number Concentration

SMPS

May-2009

5 mn

EMEP, EUSAAR, ACTRIS

Aerosol size distribution

SMPS

May -2009

5 mn

EMEP, EUSAAR, ACTRIS

Aerosol size distribution

PSM

Jul -2011

5 mn

OPGC

Aerosol size distribution

OPC

2011

5 min

OPGC

Cluster size distribution

AIS

Feb-2005

5 min

OPGC

Aerosol chemical composition

AMS

Oct-2008

Intensive observation period

OPGC

Mass concentration

TEOM -FDMS

May -2009

5 mn

EMEP, EUSAAR, ACTRIS

Hygroscopic_growth_factor

HTDMA

Aug-2009

5 mn

EMEP, EUSAAR, ACTRIS

Liquid Water Content, Cloud drop radius,
Effective radius

PVM Gerber

Jan-2002

5 mn

OPGC

CCN

CCN counter

Jul-2011

5 mn

ACTRIS

Aerosol optical depth (AOD)

photometer

Jan-2010

5 mn

AERONET

Aerosol backscatter, extinction

LIDAR

Jan-2009

5 mn

EARLINET, ACTRIS

 

 

 

     
   
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