Data Quality Reports for Session: 145456 User: maike1ahlg Completed: 10/17/2012

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D091228.1GRW/SKYRAD/M1 - AOS tower Obstructiongrwskyrad20sM1.a0, grwskyrad60sM1.b1


DQRID : D091228.1
Start DateStart TimeEnd DateEnd Time
12/02/2009000001/11/20102359
Subject:
GRW/SKYRAD/M1 - AOS tower Obstruction
DataStreams:grwskyrad20sM1.a0, grwskyrad60sM1.b1
Description:
Due to the persistent cloudy conditions at this site the shading is rarely evident in the 
data. But at approximately 1010GMT everyday during from approximately 12/2/2009 to 
1/11/2010 the NIP is shaded by the AOS tower.  Data review indicates that only the NIP 
(short_direct_normal) is obstructed when the sun is at 130 to 132 deg azimuth during the time 
period specified.

NIP data are not recoverable.  However, short_direct_normal can be reconstructed by 
applying the following formula:

Short_direct_normal = (down_short_hemisp-down_short_diffuse_hemisp)/cos(Zenith angle)
Measurements:grwskyrad20sM1.a0:
  • inst_direct_normal
grwskyrad60sM1.b1:
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • short_direct_normal_std

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