SGP/RL/C1 - Alternatively processed data available

Reprocessed ARM Raman Lidar water vapor data is available for 
               the IHOP IOP period 20020515 to 20020625 at 
               http://iop.archive.arm.gov/arm-iop/2002/sgp/ihop/turner-raman/
               The data were reprocessed by Dave Turner to apply an improved 
               near-field correction ("overlap correction") to the water
               vapor data collected by the Raman lidar during IHOP.  These
               files contain only the water vapor data; users who require the
               aerosol and cloud fields from this instrument will need to
               retrieve the regular ARM data sets.

• Cloud base height(cloud_base_height_other)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(wv_rl_max_height)
• Water vapor mixing ratio profile from the low channel(mixing_ratio_low)
• air temperature (NGM250 predicted)(temperature)
• Mode of the dataset (as defined by the filter arrangement of the lidar)(mode)
• lat(lat)
• Water vapor mixing ratio profile from the high channel(mixing_ratio_high)
• Array of heights for the range gates(height)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)
• Uncertainty of the water vapor mixing ratio profile from the high channel(mixing_ratio_error_high)
• lon(lon)
• atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)
• Water vapor mixing ratio profile created by merging the two channels(mixing_ratio_1)
• Water vapor mixing ratio profile created by merging the two calibrated channels
  together with the surface in-situ measurements(mixing_ratio_3)
• Water vapor mixing ratio profile created by merging the two calibrated channels(mixing_ratio_2)
• Relative humidity over ice calculated from the merged water vapor mixing ratio
  data(relative_humidity_over_ice)
• Altitude for low (WFOV) channels(height_low)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• Dummy altitude for Zeb(alt)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  channels(mixing_ratio_1_error)
• Altitude for high (NFOV) channels(height_high)
• Water vapor mixing ratio(mixing_ratio_other)
• relative humidity with respect to saturation over a flat surface of liquid wate(relative_humidity)
• Differential transmission correction for aerosols(diff_trans_aerosol_corr)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  calibrated channels(mixing_ratio_3_error)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  calibrated channels(mixing_ratio_2_error)
• Uncertainty of the water vapor mixing ratio profile from the low channel(mixing_ratio_error_low)
• Precipitable water vapor observed by the microwave radiometer(pwv_mwr)
• base time(base_time)
• Vertical resolution of bright mode (mode == 2) data(vertical_resolution_bright_mode)
• Average laser energy of the ensemble shots(average_energy)
• Calibration factor used to match the high channel mixing ratio to the low
  channel mixing ratio(calib_high_low)
• Flag indicating whether or not there was a sample from the temperature_source
  dataset during the lidars averaging interval (1) or not (0)(sample_times_other)
• Number of laser shots recorded(shots_summed)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Vertical resolution of normal mode (mode == 1) data(vertical_resolution_normal_mode)
• Cloud liquid water vapor by the microwave radiometer(liq_mwr)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)
• Calibration factor for entire profile(calib_factor)
• Time offset of tweaks from base_time(time_offset)

• Relative humidity inside the instrument enclosure(rh)
• Water vapor mixing ratio from the Raman lidar near 60 m(rl_w_60m)
• Temperature(t)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)
• Water vapor mixing ratio profile(w)
• Random error in the water vapor mixing ratio profile(w_err)
• Pressure(p)
• Resolution of the water vapor profiles(mixing_ratio_resolution)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(w_max_height)
• Water vapor mixing ratio error from the Raman lidar near 60 m(rl_w_60m_err)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)

• Water vapor mixing ratio from the Raman lidar near 60 m(rl_w_60m)
• Random error in the water vapor mixing ratio profile(w_err)
• Pressure(p)
• Water vapor mixing ratio error from the Raman lidar near 60 m(rl_w_60m_err)
• Temperature(t)
• Resolution of the water vapor profiles(mixing_ratio_resolution)
• Water vapor mixing ratio profile(w)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(w_max_height)
• Relative humidity inside the instrument enclosure(rh)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)

SGP/RL/C1 - Metadata errors

The latitude, longitude and altitude of the Raman Lidar were
incorrectly entered into the ARM database.  The correct location
of the SGP.C1 Raman Lidar is:
      Lat: 36.609N
      Lon: 97.487W
      Alt:    311m

• Dummy altitude for Zeb(alt)
• lat(lat)
• lon(lon)

• lon(lon)
• Dummy altitude for Zeb(alt)
• lat(lat)

• Dummy altitude for Zeb(alt)
• lon(lon)
• lat(lat)

• lon(lon)
• lat(lat)
• Dummy altitude for Zeb(alt)

• lon(lon)
• lat(lat)
• Dummy altitude for Zeb(alt)

SGP/RL/C1 - Decreased sensitivity

The sensitivity of the Raman Lidar degraded significantly beginning in late 2001.  Between 
May and September 2004, the electronics were upgraded and the telescope was refurbished 
resulting in sensitivity better than when the instrument system was first installed.

A detailed technical report describing the effects of the signal degradation and the steps 
taken to correct the problem is being written.  In the interim, contact Dave Turner 
(dave.turner@pnl.gov) for more information.

• Calibrated Aerosol scattering ratio profile from the high channel(cal_asr_high)
• Random error in the aerosol backscatter coefficient profile(bscat_err)
• lon(lon)
• Vertical scale factor to make shape of high channel profile match low channel(vert_scale_hi)
• Scale factor added to the high aerosol scattering ratio at each time sample and
  height (2nd iteration)(scale_add_hi_2)
• Differential transmission correction for aerosols(diff_trans_aerosol_corr)
• Uncertainty of the Calibrated aerosol scattering ratio profile from the high
  channel(cal_asr_error_high)
• Calibration factor applied to the high aerosol scattering ratio at each time
  sample(cal_factor_hi)
• Aerosol scattering ratio profile created by merging the two Calibrated channels(cal_asr_1)
• Aerosol scattering ratio profile from the low channel(asr_low)
• Uncertainty of the aerosol scattering ratio profile created by merging the two
  channels(asr_1_error)
• Calibrated Aerosol scattering ratio profile from the low channel(cal_asr_low)
• Type of calibration used to compute the high channel calibration at each time
  interval(hi_cal_type)
• Altitude for high (NFOV) channels(height_high)
• lat(lat)
• air temperature (NGM250 predicted)(temperature)
• Time offset of tweaks from base_time(time_offset)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• Uncertainty of the Calibrated aerosol scattering ratio profile from the low
  channel(cal_asr_error_low)
• Uncertainty of the aerosol scattering ratio profile created by merging the two
  Calibrated channels(cal_asr_1_error)
• Scale factor added to the low aerosol scattering ratio at each time sample(scale_add_lo)
• Altitude for low (WFOV) channels(height_low)
• base time(base_time)
• Number of laser shots recorded(shots_summed)
• Average laser energy of the ensemble shots(average_energy)
• Corrected Aerosol volume backscattering coefficient at 355 nm - removed negative
  vals(corr_bscat)
• Aerosol scattering ratio profile from the high channel(asr_high)
• Dummy altitude for Zeb(alt)
• Aerosol scattering ratio profile created by merging the two channels(asr_1)
• Uncertainty of the aerosol scattering ratio profile from the low channel(asr_error_low)
• Scale factor added to the high aerosol scattering ratio at each time sample and
  height(scale_add_hi)
• Vertical scale factor for statistical T-test sanity check on high channel data(vert_scale_hi_2)
• Cloud mask(cloud_mask)
• Calibration factor applied to the low aerosol scattering ratio at each time
  sample(cal_factor_lo)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Uncertainty of the aerosol scattering ratio profile from the high channel(asr_error_high)

• Cloud attenuation flag(attenuation_flag)
• Depolarization calibration factor(calibration_factor)
• Cloud mask(cloud_mask)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• lon(lon)
• base time(base_time)
• Time offset of tweaks from base_time(time_offset)
• Cloud optical thickness computed from aerosol (elastic) data(cloud_optical_thickness_aer)
• Number of laser shots recorded(shots_summed)
• Array of heights for the range gates(height)
• Cloud base height, measured by MPL(cloud_base_height)
• lat(lat)
• Cloud depth(cloud_depth)
• cloud top height(cloud_top_height)
• Cloud optical thickness computed from nitrogen data(cloud_optical_thickness_n2)
• Average laser energy of the ensemble shots(average_energy)
• Dummy altitude for Zeb(alt)
• Linear depolarization ratio profile(depolarization_ratio)
• Uncertainty of the linear depolarization ratio profile(depolarization_ratio_error)

• lat(lat)
• Uncertainty of the water vapor mixing ratio profile from the high channel(mixing_ratio_error_high)
• Water vapor mixing ratio(mixing_ratio_other)
• Uncertainty of the water vapor mixing ratio profile from the low channel(mixing_ratio_error_low)
• Flag indicating whether or not there was a sample from the temperature_source
  dataset during the lidars averaging interval (1) or not (0)(sample_times_other)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Cloud liquid water vapor by the microwave radiometer(liq_mwr)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(wv_rl_max_height)
• Water vapor mixing ratio profile from the low channel(mixing_ratio_low)
• Mode of the dataset (as defined by the filter arrangement of the lidar)(mode)
• Array of heights for the range gates(height)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)
• lon(lon)
• Water vapor mixing ratio profile created by merging the two channels(mixing_ratio_1)
• Water vapor mixing ratio profile created by merging the two calibrated channels
  together with the surface in-situ measurements(mixing_ratio_3)
• Water vapor mixing ratio profile created by merging the two calibrated channels(mixing_ratio_2)
• Relative humidity over ice calculated from the merged water vapor mixing ratio
  data(relative_humidity_over_ice)
• Altitude for low (WFOV) channels(height_low)
• Dummy altitude for Zeb(alt)
• Altitude for high (NFOV) channels(height_high)
• Precipitable water vapor observed by the microwave radiometer(pwv_mwr)
• Number of laser shots recorded(shots_summed)
• Water vapor mixing ratio profile from the high channel(mixing_ratio_high)
• atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  channels(mixing_ratio_1_error)
• Differential transmission correction for aerosols(diff_trans_aerosol_corr)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  calibrated channels(mixing_ratio_2_error)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)
• Cloud base height(cloud_base_height_other)
• air temperature (NGM250 predicted)(temperature)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• relative humidity with respect to saturation over a flat surface of liquid wate(relative_humidity)
• Uncertainty of the water vapor mixing ratio profile created by merging the two
  calibrated channels(mixing_ratio_3_error)
• base time(base_time)
• Vertical resolution of bright mode (mode == 2) data(vertical_resolution_bright_mode)
• Average laser energy of the ensemble shots(average_energy)
• Calibration factor used to match the high channel mixing ratio to the low
  channel mixing ratio(calib_high_low)
• Vertical resolution of normal mode (mode == 1) data(vertical_resolution_normal_mode)
• Calibration factor for entire profile(calib_factor)
• Time offset of tweaks from base_time(time_offset)

• lon(lon)
• Vertical resolution of the low aerosol extinction coefficient profile data(extinction_low_resolution)
• Aerosol optical depth calculated from the extinction_1 profile(aod_1)
• Aerosol backscatter coefficient at 355 nm - smoothed to N2 extinction resolution(smoothed_backscatter)
• Aerosol extinction coefficient profile created by marrying the merged extinction
  from N2 data with the extinction from backscatter data(extinction_married1)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Maximum altitude used in the calculation of the aerosol optical depth from the
  extinction_from_backscatter profile(aod_bscat_max_ht)
• lat(lat)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• Average laser energy of the ensemble shots(average_energy)
• Aerosol extinction coefficient profile from the high N2 channel data, where the
  low N2 channel was used to correct for the overlap of the high channel(extinction_high_olap_corrected)
• Aerosol extinction coefficient profile calculated from backscatter and the
  extinction-to-backscatter ratio(extinction_from_backscatter)
• Uncertainty of the aerosol extinction coefficient profile calculated from the
  aerosol backscatter coefficient(extinction_from_backscatter_error)
• Maximum altitude used in the calculation of the aerosol optical depth from the
  extinction_1 profile(aod_1_max_ht)
• Aerosol extinction coefficient profile from the low N2 channel data(extinction_low)
• Uncertainty of the aerosol extinction coefficient profile from the high N2
  channel(extinction_high_error)
• Aerosol optical depth from the surface computed from the extinction_1 profiles(aod_1_profile)
• Aerosol optical depth from the surface computed from the married1 extinction
  profiles(aod_married1_profile)
• Maximum altitude used in the calculation of the aerosol optical depth from the
  extinction_married1 profile(aod_married1_max_ht)
• Vertical resolution of the merged aerosol extinction coefficient profile data(extinction_1_resolution)
• Uncertainty of the married aerosol extinction coefficient profile(extinction_married1_error)
• Aerosol optical depth calculated from the extinction_married1 profile(aod_married1)
• Altitude for low (WFOV) channels(height_low)
• Uncertainty in the aerosol backscatter coefficient at 355 nm - smoothed to N2
  extinction resolution(smoothed_backscatter_error)
• Ratio of aerosol extinction to aerosol backscatter(Sa_2)
• Ratio of aerosol extinction to aerosol backscatter(Sa_1)
• Uncertainty of the aerosol extinction coefficient profile from the overlap
  corrected high N2 channel(extinction_high_olap_corrected_error)
• Aerosol optical depth calculated from the extinction_from_backscatter profile(aod_bscat)
• Error in the aerosol optical depth calculated from the extinction_1 profile(aod_1_error)
• Aerosol extinction coefficient profile created by merging the two N2 channels
  extinction profiles(extinction_1)
• Error in the aerosol optical depth calculated from the
  extinction_from_backscatter profile(aod_bscat_error)
• Vertical resolution of the high aerosol extinction coefficient profile data(extinction_high_resolution)
• Mask indicating from where the extinction value came from in the aerosol
  extinction coefficient profile created by marrying the merged extinction from N2
  data w(extinction_married1_mask)
• Number of laser shots recorded(shots_summed)
• Aerosol extinction coefficient profile from the high N2 channel data(extinction_high)
• Uncertainty of the aerosol extinction coefficient profile created by merging the
  two N2 channels extinction profiles(extinction_1_error)
• Uncertainty in the aerosol backscatter coefficient at 355 nm(backscatter_error)
• Aerosol optical depth from the surface computed from the
  extinction_from_backscatter profiles(aod_bscat_profile)
• Time offset of tweaks from base_time(time_offset)
• Altitude for high (NFOV) channels(height_high)
• base time(base_time)
• Mode of the dataset (as defined by the filter arrangement of the lidar)(mode)
• Dummy altitude for Zeb(alt)
• Error in the aerosol optical depth calculated from the extinction_married1
  profile(aod_married1_error)
• Uncertainty of the aerosol extinction coefficient profile from the low N2
  channel(extinction_low_error)

• Laser pulse energy(pulse_energy)
• base time(base_time)
• lon(lon)
• Cloud value check flag(cloud_value_check)
• Nominal number of seconds of data acquired(acquisition_time)
• N2 cloud check value(n2_cloud_check_value)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• lat(lat)
• Supplemental 9(s9)
• Supplemental 8(s8)
• Supplemental 3(s3)
• Supplemental 2(s2)
• Supplemental 1(s1)
• Supplemental 7(s7)
• Supplemental 6(s6)
• Supplemental 5(s5)
• Supplemental 4(s4)
• Relative humidity inside the instrument enclosure(rh)
• Count rate in the high elastic channel(elastic_counts_high)
• Count rate in the low water vapor channel(water_counts_low)
• Number of laser shots recorded(shots_summed)
• Flag indicating the filters (or lack of) added to the instrument(filter)
• Count rate in the high nitrogen channel(nitrogen_counts_high)
• Count rate in the low nitrogen channel(nitrogen_counts_low)
• Count rate in the high depolarization channel(depolarization_counts_high)
• Count rate in the high water vapor channel(water_counts_high)
• Supplemental 10(s10)
• Temperature 2 inside the instrument enclosure(temp2)
• Temperature 1 inside the instrument enclosure(temp1)
• Temperature 4 inside the instrument enclosure(temp4)
• Temperature 3 inside the instrument enclosure(temp3)
• Count rate in the low elastic channel(elastic_counts_low)
• Temperature 5 inside the instrument enclosure(temp5)
• Supplemental 12(s12)
• Supplemental 11(s11)

• null(Raw data stream - documentation not supported)

• Relative humidity inside the instrument enclosure(rh)
• Water vapor mixing ratio from the Raman lidar near 60 m(rl_w_60m)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)
• lon(lon)
• Random error in the water vapor mixing ratio profile(w_err)
• base time(base_time)
• Aerosol optical depth profiles at 355 nm(aod_profile)
• Linear depolarization ratio profile(depol)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(w_max_height)
• Mode of the dataset (as defined by the filter arrangement of the lidar)(mode)
• Time offset of tweaks from base_time(time_offset)
• Precipitable water vapor observed by the microwave radiometer(pwv_mwr)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)
• Random error in the aerosol scattering ratio profile(asr_err)
• Resolution of the aerosol extinction and backscatter profiles(extinction_resolution)
• Random error in the aerosol optical depth(aod_err)
• Aerosol extinction coefficient at 355 nm(ext)
• Cloud mask(cmask)
• Dummy altitude for Zeb(alt)
• Maximum altitude used while computing AOD from the extinction profile(aod_max_height)
• Temperature(t)
• Water vapor mixing ratio profile(w)
• Cloud liquid water vapor by the microwave radiometer(liq_mwr)
• Pressure(p)
• Number of laser shots recorded(shots_summed)
• Preliminary cloud base height above ground level(cbh)
• Flag indicating whether or not there was a sample from the temperature_source
  dataset during the lidars averaging interval (1) or not (0)(sample_times_other)
• Aerosol backscatter coefficient at 355 nm(bscat)
• Water vapor mixing ratio from the 60 m tower(twr_w_60m)
• Water vapor mixing ratio error from the Raman lidar near 60 m(rl_w_60m_err)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Aerosol optical depth at 355 nm(aod)
• Random error in the linear depolarization ratio profile(depol_err)
• Resolution of the aerosol scattering ratio profile(scattering_ratio_resolution)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• Resolution of the depolarization ratio profile(depolarization_resolution)
• Random error in the aerosol backscatter coefficient profile(bscat_err)
• Array of heights for the range gates(height)
• Resolution of the water vapor profiles(mixing_ratio_resolution)
• lat(lat)
• Random error in the aerosol extinction coefficient profile(ext_err)
• Average laser energy of the ensemble shots(average_energy)
• Aerosol scattering ratio profile(asr)

• Linear depolarization ratio profile(depol)
• Time offset of tweaks from base_time(time_offset)
• Water vapor mixing ratio from the Raman lidar near 60 m(rl_w_60m)
• Random error in the aerosol backscatter coefficient profile(bscat_err)
• Maximum altitude used while computing AOD from the extinction profile(aod_max_height)
• Fraction of the total column amount of water vapor the Raman lidar senses(pwv_rl_fraction)
• Flag indicating whether or not there was a sample from the temperature_source
  dataset during the lidars averaging interval (1) or not (0)(sample_times_other)
• Random error in the water vapor mixing ratio profile(w_err)
• Aerosol optical depth at 355 nm(aod)
• Pressure(p)
• Water vapor mixing ratio error from the Raman lidar near 60 m(rl_w_60m_err)
• Precipitable water vapor observed by the microwave radiometer(pwv_mwr)
• Temperature(t)
• Water vapor mixing ratio profile(w)
• Aerosol extinction coefficient at 355 nm(ext)
• Average laser energy of the ensemble shots(average_energy)
• Relative humidity inside the instrument enclosure(rh)
• Random error in the aerosol extinction coefficient profile(ext_err)
• Resolution of the aerosol scattering ratio profile(scattering_ratio_resolution)
• Preliminary cloud base height above ground level(cbh)
• Aerosol backscatter coefficient at 355 nm(bscat)
• Dummy altitude for Zeb(alt)
• Resolution of the water vapor profiles(mixing_ratio_resolution)
• Mode of the dataset (as defined by the filter arrangement of the lidar)(mode)
• Aerosol scattering ratio profile(asr)
• Suggested maximum altitude to use the water vapor data from the Raman lidar(w_max_height)
• lon(lon)
• Random error in the linear depolarization ratio profile(depol_err)
• Resolution of the depolarization ratio profile(depolarization_resolution)
• Cloud mask(cmask)
• base time(base_time)
• Aerosol optical depth profiles at 355 nm(aod_profile)
• Water vapor mixing ratio from the 60 m tower(twr_w_60m)
• Random error in the precipitable water vapor observed by the Raman lidar(pwv_rl_err)
• Cloud liquid water vapor by the microwave radiometer(liq_mwr)
• Precipitable water vapor observed by the Raman lidar(pwv_rl)
• Random error in the aerosol optical depth(aod_err)
• Resolution of the aerosol extinction and backscatter profiles(extinction_resolution)
• Array of heights for the range gates(height)
• lat(lat)
• Number of laser shots recorded(shots_summed)
• Flag denoting the occurrence of power or alignment tweaks(tweaks)
• Random error in the aerosol scattering ratio profile(asr_err)