D Q R Report

DQRID : D070423.2

Start Date	Start Time	End Date	End Time	Data Quality Metric
03/09/2007	1615	03/23/2007	1310	Does not affect quality

Subject:	SGP/RL/C1 - Interference filter replaced temporarily
DataStreams:	sgp10rlprofbe1turnC1.c0, sgp10rlprofdep1turnC1.c1, sgp10rlprofasr1ferrC1.c1, sgprlC1.00, sgp10rlprofbe1turnC1.c1, sgprlC1.a0, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1
Description:	The sensitivity of the Raman lidar has been degrading since the fall of 2005. One possible source of the degradation is the interference filters; i.e., their transmission could be becoming smaller for some reason. To evaluate this hypothesis, we removed the interference filter from the narrow field-of-view nitrogen channel (i.e., the N2 high channel) on 3/9/2007, and replaced it with its spare. The original filter was sent to the manufacturer for evaluation. Its transmission was measured by the manufacturer to be nearly identical to its original performance; in other words, the filter is not responsible for the lidar's loss of sensitivity. The original interference filter was reinstalled in the system on 3/23/2007. The temporary use of the spare interference filter in the high N2 channel should not affect the data quality, as the transmission characteristics of the spare and the original filter are nearly identical.
Suggestions:
Measurements:	sgp10rlprofext1ferrC1.c1: aod_1_max_ht extinction_from_backscatter_error extinction_high extinction_married1 extinction_low_error aod_bscat_error extinction_low_resolution Sa_1 aod_married1_profile Sa_2 shots_summed aod_bscat alt lat extinction_high_resolution aod_married1 aod_married1_error extinction_high_error extinction_from_backscatter aod_1_profile lon backscatter extinction_married1_mask extinction_1_error extinction_1_resolution aod_bscat_profile aod_1_error smoothed_backscatter aod_bscat_max_ht extinction_low extinction_married1_error backscatter_error mode height_high smoothed_backscatter_error time_offset tweaks aod_married1_max_ht base_time height_low extinction_1 aod_1 extinction_high_olap_corrected_error extinction_high_olap_corrected average_energy more sgp10rlprofasr1ferrC1.c1: cal_asr_1 scale_add_lo vert_scale_hi_2 cal_asr_error_low asr_error_high cal_factor_lo lat cal_asr_low alt bscat_err lon scale_add_hi average_energy temperature asr_low height_low diff_trans_aerosol_corr hi_cal_type backscatter asr_1_error tweaks vert_scale_hi cal_asr_1_error shots_summed height_high asr_1 cal_asr_high base_time cal_asr_error_high asr_error_low cloud_mask asr_high scale_add_hi_2 time_offset corr_bscat cal_factor_hi more sgp10rlprofmr1turnC1.c1: lon mixing_ratio_low mode vertical_resolution_bright_mode lat mixing_ratio_1_error pwv_rl_err height mixing_ratio_3 mixing_ratio_2_error mixing_ratio_2 mixing_ratio_1 average_energy cloud_base_height_other time_offset wv_rl_max_height mixing_ratio_high mixing_ratio_error_high tweaks calib_high_low height_low shots_summed mixing_ratio_3_error pwv_mwr vertical_resolution_normal_mode calib_factor sample_times_other height_high pressure relative_humidity_over_ice relative_humidity base_time diff_trans_aerosol_corr mixing_ratio_other liq_mwr alt pwv_rl_fraction temperature mixing_ratio_error_low pwv_rl more sgprlC1.00: Raw data stream - documentation not supported more sgprlC1.a0: nitrogen_counts_high shots_summed_elastic_low shots_summed_water_low acquisition_time base_time depolarization_analog_high depolarization_counts_high water_counts_high laser_head elastic_analog_low shots_summed_depolarization_high time shots_summed_elastic_high water_analog_high alt shots_summed_nitrogen_high elastic_counts_high lat temp5 s4 s5 temp6 temp3 s6 temp4 s7 temp1 s10 temp2 s1 s2 s3 filter s8 s9 pulse_energy shots_summed_water_high elastic_analog_high s11 s12 rh elastic_counts_low water_counts_low shots_summed nitrogen_counts_low nitrogen_analog_low n2_cloud_check_value nitrogen_analog_high cloud_value_check lon water_analog_low time_offset shots_summed_nitrogen_low more sgp10rlprofdep1turnC1.c1: cloud_base_height lon height depolarization_ratio cloud_depth average_energy attenuation_flag tweaks cloud_top_height alt lat calibration_factor time_offset shots_summed cloud_optical_thickness_aer cloud_optical_thickness_n2 depolarization_ratio_error base_time cloud_mask more sgp10rlprofbe1turnC1.c0: extinction_resolution pwv_rl_err aod_err aod_max_height depol_err asr_err rh lon bscat t w p cbh cmask aod bscat_err lat alt base_time twr_w_60m pwv_mwr time_offset sample_times_other rl_w_60m tweaks shots_summed asr rl_w_60m_err mixing_ratio_resolution depol ext pwv_rl aod_profile scattering_ratio_resolution mode ext_err w_max_height pwv_rl_fraction depolarization_resolution liq_mwr average_energy height w_err more sgp10rlprofbe1turnC1.c1: depol_err cbh pwv_rl_fraction depolarization_resolution pwv_mwr rl_w_60m aod lat pwv_rl alt base_time aod_err asr aod_max_height liq_mwr height rl_w_60m_err ext w t ext_err p bscat_err tweaks mixing_ratio_resolution time_offset shots_summed depol bscat extinction_resolution cmask twr_w_60m w_max_height average_energy aod_profile w_err pwv_rl_err lon rh mode sample_times_other asr_err scattering_ratio_resolution more

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