Instruments at the Chacaltaya GAW station

Gas concentration  

CO  
CO2 and CH4
O3  
Water vapor isotopes #
Hg0 #
SO2
Particle size distribution

MPSS* 
NAIS
HTDMA* # 
Optical properties

Nephelometer*
Aethalometer*
MAAP*
LIDAR
Chemical
composition 

High-Volume Sampler  
Passive Atmospheric Sampling
Q-ACSM* #
Ancillary meteorological variables

AWS 5380m
AWS 5260 m
* Instruments connected to the main isokinetic inlet (heated to keep the relative humidity of the sampled air below 90%)
# Instruments of projects currently closed
The instruments are deployed in two locations:

Altitude (masl)
Latitude
Longitude
Observatory
5240
16°21.014'S
68º07.886'W
Northwestern ridge 
5380
16º20.817'S
68º07.698'W
The observatroy is heated to keep the temperature between 20 and 28 ºC. Several fans fans renew continuosly the air inside the instruments' room.
The shelter located in the northwestern ridge of Chacaltaya is not heated.
Picture
Side view of the building hosting the instruments in CHC
Picture
Routine check of the inlets. The metropolitan area is visible below, in the Altiplano.
Picture
Hut in the northwestern ridge of the mountain