ANN ARBOR, MICHIGAN, USA

Contacts: Mr Mojtaba Navvab Art and Architecture Building at the University of Michigan's North Campus 2000 Bonisteel Boulevard Ann Arbor, Michigan 48109-2069, USA Tel : (1) 313 936 0228 Fax : (1) 313 763 2322 E-mail : mojtaba.navvab@um.cc.umich.edu Server :	Station Location: Ann Arbor, USA.. Latitude: 42°10' N Longitude: 83°26' W Height above sea level: 266 m. Local Time: GMT-5 Code: USA1 Type: Research class. Operation: Started in 1990.
Topographic map showing the land within a 5 km radius of the station location

ANN ARBOR, MICHIGAN, USA

Site surroundings: The photometric and radiation sensors are located on the highest roof top section of the art and architecture building, on the north campus of the University of Michigan. The daylight availability station is located 64 km from the city of Detroit by Lake Erie.	Climate characteristics: Ann Arbor's climate is typical of the midwest region of the country with four distinct seasons. The station experiences periods of substantial partly cloudy sky conditions with rapidly changing cloud conditions. The University of Michigan also has a solar energy meteorological research station located at the Atmospheric and Space Research Building on the North Campus, 400 m away from the Architecture building.
Map showing the immediate surroundings of the station

ANN ARBOR, MICHIGAN, USA

Sampling Interval: 10 seconds. Recording Interval: 30 seconds. Illuminances: Global horizontal: Licor LI-200 SA Direct normal: Licor LI-200 SA + NIP Diffuse horizontal: Licor LI-200 SA Global Vert. NESW: Licor LI-200 SA Irradiances: Global horizontal: Eppley PSP Direct normal: Eppley NIP Diffuse horizontal: Eppley PSP + Shadow band Diffuse horizontal: Eppley PSP + Tracking disk Global Vert. NESW: Licor LI-200 SA Others: Zenith luminance: Licor LI-200 SA Fixed Sky Scanner: 20 x Licor LI-200 SA Sunshine duration: Eppley (AOS) Total cloud amount: Eppley (AOS) Air temperature: Young Dew point temp.: Young Wind speed/direction: Young PAR: Eppley (AOS) UV-A: Eppley (AOS) UV-B: Eppley (AOS) Colorimetry: Chroma meter CS-100 Shadow band specifications: Diffuse illuminance: radius: 30.5 cm / width: 8.0 cm Diffuse irradiance: radius: 30.5 cm / width: 8.0 cm

Station map Obstruction for the global horizontal illuminance sensor

Comments This station is a collaborative research effort between the Architectural and Planning Research Lab (APRL) and the departments of Atmospheric and Oceanic Sciences (AOS) at the University of Michigan. The sky luminance distribution is measured using a fixed sky scanner using 20 tubes. Each of this tube has a restricted field of view of 30'. The luminance and the correlated color distribution of the sky are measured using a calibrated CCD video camera, an image capture system and software and computer available in the market. Threshold colors determine whether each sky element is cloud or blue sky, from this information the system computes the cloud cover. The instruments used for calibration are the LH 151 N/1 universal lamphousing and a LX 1000-2 Xenon Arc Lamp with a special socket, a LHA 150/1 UV grade fused silica secondary lens assembly and a Minolta Chroma meter CS-100.

ANN ARBOR, MICHIGAN, USA

View 1 of the station	Comments This view of the station is looking toward South-West. The diffuse illuminance and irradiance sensors can be seen.
View 2 of the station	Comments This view shows the fixed multi-sensor sky luminance mapper. It is made of 20 Licor sensors, each fitted with a tube restricting its field of view to 30'. In addition to the sky luminance mapper, the sky luminance distribution as well as the cloud cover are obtained using a calibrated video system.

ANN ARBOR, MICHIGAN, USA

Important modifications made to the acquisition system, recording interval modification, time during which the station was not operating...

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