homepage Recent Events Classes Location Contact
CURRENT RESEARCH
Tropospheric Ozone DIAL
Scan Angle Method
Tropospheric Ozone
USA Ozonesonde Climatology
USA Springtime Ozone
Pathway
GOME Tropospheric
Ozone
CCP Tropospheric Ozone
A/C Tropospheric
Ozone Spectrometer
Stratospheric Ozone
Recovery
Lower Stratospheric
Ozone Recovery
40km Ozone Recovery
Ozone Collar Recovery
IONS 06
PBL Aerosol Radiometer
Observation
Satellite Trace
Gasses M/M
Air Quality Forecasting
ECP FTIR
HUNTSVILLE
OZONESONDE STATION
About the Station
Download Data
Huntsville Plots
Operations Guide
Ozonesonde Network
Campaigns
RAPCD
About RAPCD
Maintenance
Tropospheric Ozone DIAL
Ozone DIAL Data
Doppler Wind Lidar
Radiometers



 

REGIONAL ATMOSPHERIC PROFILING CENTER FOR DISCOVERY

RADIOMETERS

RADIOMETER PHOTO GALLERY

ESSC scientists are measuring the downwelling thermal infrared radiation from the atmosphere, using two ventilated Kipp & Zonen CG4 pyrgeometers atop a twelve-foot tower on the NSSTC Annex rooftop. This vantage point has an unobstructed view of the sky down to the horizon. The CG4 pyrgeometers incorporate an advanced optical and thermal design that eliminates the need for thermistors to measure the dome temperature, and correct for the temperature offset between the dome and the case. The dome shape also enables improved homogeneity in the thin-film solar filter that is deposited on the dome interior; this feature improves the azimuthal uniformity of the sensor responsivity. These two precision sensors are currently collocated to inter-calibrate their relative responsivity over a wide range of air temperatures, sky conditions, and sky temperatures. Results to date indicate excellent agreement between the two sensors (see sample data in Figures A&B). In the raw data, relative offsets rarely exceed 1-2 watt/m2; the largest offsets occur on hot days with clear daylight skies, and during rapid changes in air temperature or sky temperature. These offsets will be substantially reduced after corrections for temperature dependence, non-linearity, and solar leak-through in the thermopile response. Noise levels in the 1-second data are about 0.1 watt/m2 at night and about 0.2-0.5 watt/m2 in sunlight; these noise levels will be negligible after averaging to the 1-minute BSRN standard. Danielle Nuding, ESSC Undergraduate Research Technician, had the primary responsibility for installing the instrumentation and programming the data logger. Stephanie Long, ESSC Undergraduate Research Technician, is monitoring the instruments and analyzing the data. David Bowdle, ESSC Research Scientist, designed the installation and oversees the activity.

Kipp & Zonen Pyrgeometers

 

DEPSCOR PROGRESS REPORTS

Measurements of Downwelling Infrared Irradiance

 

 

 

 


This website is an informative resource about Atmospheric Chemistry at UAH.
© 2007-2008