World Meteorological OrganizationWorking together in weather, climate and water

Site ClassificationC. Bruce Baker , NOAAVice President of CIMO

WMO; Name of department www.wmo.int

WMO

3Site Classification

Site ClassificationWMO

Experimental focus:

• Quantify air temperature biases caused by proximity to artificial heating sources• Quantify air temperature biases associated with sensor type and radiation shielding

Air temperature measurements are made using both the NOAA US Climate Reference Network methodology and the National Weather Service Maximum Minimum Temperature Sensor system

1Site Classification

Site ClassificationWMO

Science QuestonsWhat are the differences in the measurement oftemperature between the MMTS and the CRN systemsas a function of solar radiation and wind speed fordifferent siting classifications??

What are the differences in the measured temperaturesbetween site classifications as a function of solarradiation and wind speed??

What is the magnitude of the local advection of heat and momentum for site classification of 5 vs 3??

Site Classification

Site ClassificationWMO

2

Siting ExperimentClass 1: More than 100 m away from artificialheating sources, parking lots, roof tops...Class 2: More than 30 m away from artificialheating sources.Class 3: More than 10 m away from artificialheating sources.Class 4: Less than 10 m away from artificialheating sources.Class 5: on/near artificial heating sources.

1Site Classification

Site ClassificationWMO

1Site Classification

Site ClassificationWMO