D Q R Report

DQRID : D061220.33

Start Date	Start Time	End Date	End Time	Data Quality Metric
09/14/2006	1900	02/21/2008	1005	Incorrect

Subject:	SGP/MFRSR/E9 - Large night-time offsets
DataStreams:	sgpmfrsrE9.a0, sgpmfrsrlangleyE9.c1, sgpmfrsrE9.b1, sgpmfrsrlangplotE9.c1
Description:	Some channels (415, 673 and 940) are flatlining in the early morning and late afternoon. This is not an instrument problem per se, but a result of the new data calibration procedure combined with the way the instrument operates. This problem is noticeable when an instrument has an unusually large negative nighttime offset. The new data calibration procedure adds back the offset to daytime data. The problem arises because the MFRSR, in banding mode, doesn't allow for values less than 0. So the large offset gets added back to the global and diffuse data producing the "flatline" until raw values exceed zero. It is most noticeable on very overcast days.
Suggestions:
Measurements:	sgpmfrsrE9.b1: direct_normal_narrowband_filter1 direct_normal_narrowband_filter4 offset_filter1 offset_filter4 direct_horizontal_narrowband_filter4 direct_horizontal_narrowband_filter6 offset_filter6 alltime_hemisp_narrowband_filter4 alltime_hemisp_narrowband_filter1 alltime_hemisp_narrowband_filter6 direct_diffuse_ratio_filter6 direct_diffuse_ratio_filter4 direct_diffuse_ratio_filter1 diffuse_hemisp_narrowband_filter6 hemisp_narrowband_filter4 direct_horizontal_narrowband_filter1 diffuse_hemisp_narrowband_filter4 hemisp_narrowband_filter1 direct_normal_narrowband_filter6 diffuse_hemisp_narrowband_filter1 hemisp_narrowband_filter6 more sgpmfrsrE9.a0: diffuse_hemisp_narrowband_filter1 diffuse_hemisp_narrowband_filter6 offset_filter1 diffuse_hemisp_narrowband_filter4 offset_filter4 direct_horizontal_narrowband_filter1 offset_filter6 hemisp_narrowband_filter1 hemisp_narrowband_filter4 hemisp_narrowband_filter6 direct_horizontal_narrowband_filter4 alltime_hemisp_narrowband_filter6 direct_horizontal_narrowband_filter6 alltime_hemisp_narrowband_filter4 alltime_hemisp_narrowband_filter1 more sgpmfrsrlangleyE9.c1: barnard_good_fraction_filter6 barnard_good_fraction_filter4 michalsky_optical_depth_filter1 barnard_error_slope_filter4 barnard_error_slope_filter6 michalsky_optical_depth_filter6 michalsky_optical_depth_filter4 barnard_good_fraction_filter1 michalsky_badflag_filter4 michalsky_badflag_filter6 michalsky_standard_deviation_filter4 michalsky_standard_deviation_filter6 michalsky_badflag_filter1 michalsky_standard_deviation_filter1 barnard_number_points_filter1 barnard_number_points_filter6 barnard_number_points_filter4 barnard_badflag_filter1 michalsky_number_points_filter6 barnard_optical_depth_filter1 michalsky_number_points_filter4 barnard_badflag_filter6 barnard_badflag_filter4 barnard_optical_depth_filter6 barnard_optical_depth_filter4 michalsky_good_fraction_filter6 michalsky_good_fraction_filter4 michalsky_good_fraction_filter1 barnard_error_slope_filter1 barnard_error_fit_filter6 michalsky_number_points_filter1 barnard_error_fit_filter1 barnard_error_fit_filter4 more sgpmfrsrlangplotE9.c1: barnard_lnI_filter1 barnard_lnI_filter4 barnard_lnI_filter6 barnard_rejected_filter6 barnard_rejected_filter4 michalsky_rejected_filter1 michalsky_rejected_filter6 michalsky_rejected_filter4 michalsky_lnI_filter6 michalsky_lnI_filter4 michalsky_lnI_filter1 barnard_rejected_filter1 more

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