__________________________________________________________________________ | GTE/PEM-Tropics DC-8 Final Archive | | Date Created: December, 1996 | | Last Updated: 6/30/97 | |--------------------------------------------------------------------------| | GTE Data Management Office NASA Project Mgr : Jim Hoell | | NASA Langley Research Center Phone: (757)864-5826 | | MS 483 NASA Data Manager : Jim Raper | | Hampton, VA 23681-0001 Phone: (757)864-8880 | | SAIC Data Manager : Ali Aknan | | Phone: (757)864-5838 | | FAX: (757)864-5841 | |__________________________________________________________________________| Version Comment/Changes *** DC-8 *** DC-8 *** DC-8 *** DC-8 *** ======= ================================================================== 1.0 Anderson LaRC/NASA: -- CNC files (3,4,7-19) were submitted on 1/27/97. All were accepted and placed in the Final Archive. ----------------------------------------------------------------------------- 1.1 Atlas NCAR: -- Organic Nitrates files (4-9,11,13-15,17,19) were submitted on 2/23/97. All were accepted and placed in Final Archive. -- Atlas re-submitted all files on 4/18/97. Reasons: The original files contained mixing ratios for n-butyl nitrate instead of 3-methyl-2-butyl nitrate. The correct values were substituted in the updated files, and n-butyl nitrate is not reported. ----------------------------------------------------------------------------- 1.1 Bandy - Thornton Drexel Univ.: -- SO2 and DMS files (All 3-19) were submitted on 2/3/97. All were accepted and placed in the Final Archive. -- Files 4,6,8,and 12 were resubmitted on 3/18/97. Reasons: File 4 had time overlap at 80780. File 6 had time overlap at 81209. File 8 had time overlap at 65304. File 12 had time overlap at 6346. ----------------------------------------------------------------------------- 1.2 Blake - UCI: -- Halocarbons, Non-methans Hydrocarbons files (All 3-19) were submitted on 3/3/97. All were accepted and placed in the Final Archive. -- Flight date and day column data in files 15-17 were off by one. These were corrected on 3/14/97. CHANGES -- Blake re-submitted all files (3-19) on 3/20/97. Reasons: Files 4 had time overlaps at 75872, 4080, 5429, and 5971 secs. File 10 had time overlaps at 71100 and 78405 secs. File 12 had eleven time overlaps between 78480 and 81450 secs. LOD corrections were made for all ethene values, below its detection limit of 2 pptv, for all files. CHANGES -- Blake re-submitted all files (3-19) on 6/30/97. All were accepted into the Final Archive. Reasons: The major difference between the first submittal of our data and this new one is that the organic nitrates have been adjusted for detector nonlinearity. So all MeONO2, EtONO2, 1-PrONO2, 2-PrONO2, and 2-BuONO2 values have changed. Also, some outliers, pointed out by other research groups and our group members, have been checked and corrected if necessary. Some of the outliers were assigned -9's because in some cases very dry air caused adsorption of some gases on the canister's inside surface. ----------------------------------------------------------------------------- 1.1 Bradshaw - GIT: -- NO_AMV, NO_AMP, NO_ETU, NO_LIN files (9-19) were submitted on 3/3/97. All were accepted and placed in Final Archive. -- Bradshaw re-submitted NO files (9-19) and the remaining files (3-8) on 3/19/97. Round off errors in Time Data (files 9-19) were corrected. All were accepted and placed in Final Archive. -- Bradshaw submitted NO2 files ((3-8)*,9-19) on 5/21/97. All were accepted and placed in Final Archive. (* File contains Header only). ----------------------------------------------------------------------------- 1.1 Browell - LaRC/NASA: -- Zeinth and Nadir O3 and Aerosol Scattering ratio files (All 3-19) were submitted between 2/1/97 and 2/19/97. All were accepted and placed in the Final Archive. -- All Ozone files (beondxx.pmt and beozdxx.pmt) were re-submitted on 2/27/97. All were accepted and placed in the Final Archive. Reasons: It was recently discovered that the differential -------- ozone absorption cross section used in the DIAL calculation of the PEM-Tropics ozone profiles was slightly (5.8%) in error. As a result, all the DIAL ozone values previously submitted to the final data archive have been reduced by a factor of 0.942 to reflect the correct differential absorption cross section. Derived -- Browell submitted composite tropospheric cross-sections files Data (beoc1dxx.pmt, xx=03-19) and tropopause heights and column files (betcd1xx.pmt, xx=03-19) on 4/1/97. the beocd1xx.pmt files were accepted and placed in the Final Archive. The betcd1xx.pmt files had timing problems and needed corrections. Derived -- Browell re-submitted tropopause heights and column files Data (betcd1xx.pmt, xx=03-19) on 4/8/97. All were accepted and placed in the Final Archive. Derived -- Browell re-submitted composite tropospheric cross-sections Data files (beoc1dxx.pmt, xx=03-19) on 4/16/97. Reasons: the old composite files had processing errors which needed correction. The vertical interpolation between nadir and zenith was driven by the in-situ data at the aircraft altitude. The tropopause heights and column files (betcd1xx.pmt, xx=03-19) were re-submitted on 4/16/97. Reasons: the new files have two additional columns of data. The rest of the data may have changes slightly, due to the changes in the composite ozone data which was used to calculate the tropopause and column ozone amounts. Derived -- Browell submitted ozone intercomparison profiles for Data Pem-Tropics on 4/29/97. All were placed in the Science Team's Archive. Derived -- Browell re-submitted composite tropospheric cross-sections Data files (beoc1dxx.pmt, xx=03-19) and tropopause heights and column files (betcd1xx.pmt, xx=03-19). All were were accepted and placed in the Final Archive on 12/17/97. ----------------------------------------------------------------------------- 1.1 Gregory LaRC/NASA: -- Ozone files (All: 3-19) were submitted on 1/27/97. All were accepted and placed in the Final Archive. -- Gregory re-submitted files 4 & 5 on 4/11/97. Reasons: Flight 4: Approximately 6 data points (2 Hz) data have been recoded as -9.9 (invalid). These data points occur around 1700 to 1800 seconds. These data points are invalid as the result of pressure transients in the instrument introduced during valve operations associated with zeroing the 2nd ozone cell. Flight 5: Approximately 6 data points (2 Hz) data have been recoded as -9.9 (invalid). These data points occur around 83000 seconds. These data points are invalid as the result of zeroing the ozone instrument and initial data submittal did not extend far enough to remove all zero effects. ----------------------------------------------------------------------------- 1.1 Heikes - URI: -- CH2O files (All: 3-7,8*,9*,10-19) were submitted on 2/2/97. All were accepted and placed in Final Archive. -- H2O2 and CH3OOH files (All: 3-19) were submitted on 3/10/97. All were accepted and placed in Final Archive. (* File contains Header ONLY) CHANGES -- Heikes re-submitted all (3-7,8*,9*,10-19) CH20 files on 3/20/97. Reasons: File 3 had time overlap at 73890 secs. File 4 had time overlap at 84090 secs. File 5 had time overlap at 80490 secs. File 6 had time overlap at 3090 secs. File 7 had time overlap at 71490 secs. File 10 had time overlap at 75090 secs. File 12 had time overlaps at 85890 and 9150 secs. File 13 had time overlap at 6690 secs. File 14 had time overlap at 13890 secs. File 15 had time overlaps at 83490, 85290, and 9750 secs. File 16 had time overlap at 2490 secs. File 17 had time overlaps at 690,11550, 12750, and 14550 secs. File 18 had time overlap at 83490 secs. File 19 had time overlap at 3750 secs. -- These time overlaps had effected some of the earlier reported concentrations which also have changed slightly. CHANGES -- Heikes has withdrawn CH2O files for modification on 4/22/97. ----------------------------------------------------------------------------- 1.0 Sachse LaRC/NASA: -- CO, CH4, N2O, and CO2 files (All 3-19) were submitted on 1/27/97. All were accepted and placed in the Final Archive. -- H2O files (5,7-15,17-19) were submitted on 1/27/97. All were accepted and placed in the Final Archive. -- H2O files 3*,4*,6*,16* were submitted on 2/17/97. All were placed in the Final Archive. (* File contains Header ONLY) -- Files 4* and 6* were re-submitted on 6/26/97. Data is NOT available for these files. ----------------------------------------------------------------------------- 1.3 Shetter NCAR: -- J(NO2) files (All: 3-19) were submitted on 12/11/96. All were accepted and placed in the Final Archive. -- J(CH20), J(O1D) files (All: 3-19) were submitted on 12/20/96. All were accepted and placed in the Final Archive. -- J(HONO) files (All: 3-19) were submitted on 1/15/97. All were accepted and placed in the Final Archive. -- Shetter re-submitted all files on 4/1/97. All were accepted and placed in the Final Archive. Reasons: After enhanced calibration efforts, and now also taking into account the angular response of the collection heads, the final data were slightly changed: All J(O1D) and J(CH2O) data were reduced by 1.8% All J(HONO) data were reduced by 1.9% All J(NO2) data were reduced by 2.0% Science Team Only: -- Following the requests of many investigators, a widely expanded set of photolysis frequencies has been derived from the NCAR spectroradiometers. In addition to the 4 "old" reactions - O3->O(1D), CH2O->H+HCO, HONO, NO2, the following 7 have been added: - H2O2, HNO3, CH3COCH3, CH3OOH, CH3ONO2, CH3CH2ONO2, PAN. New software was developed to efficiently compute the "old" and "new" photolysis frequencies. The way this new software computes the integral over cross section, quantum yield, and actinic flux is slightly different from the way this was done for the previous submittance of the 4 "old" species. Hence the results submitted here are slightly different from the previous values. The differences usually stay below 2% for CH20, HONO, and NO2. For O3, also the parametrization of cross section and quantum yield was changed (see comment section in the headers), and the differences were found up to 8%. If more detailed informaton about the changes from the last submittance are needed, please contact Martin Muller. In order to avoid a total of 187 single data files, all 11 reactions were combined into one file per flight. The new files have the new TTT-acronym "JV1" (for: J-Values, 1st version of the instruments). As opposed to the previous release, the files now carry LOD information. Due to the different spectral shapes of their cross sections and quantum yields, the 11 photolysis frequencies have different midpoints of their sampling intervals, scattering over a range of 12 s. These differencies are given in the comment section of the header of each file. Martin Muller, July 25 1997 ------ CHANGES -- The dataset containing the 11 J-Values replaced the 4 datasets (1 J-Value each) on 1/22/98 per Martin Muller. ----------------------------------------------------------------------------- 1.2 Singh NASA/ARC: -- PAN, C2Cl, Methyl Nitrate, and Ethyl/i-Propyl Nitrate files (All 3-19) were submitted on 3/5/97. All were accepted and placed in Final Archive. -- Singh re-submitted all files (3-19) on 4/5/97. Reasons: Existing data had errors. CHANGES -- Files 13-19 were re-submitted to the Final Archive on 5/9/97. by the GTE Office. Reasons: These files apparently never made it to the Final Archive on 4/5/97. ----------------------------------------------------------------------------- 1.2 Talbot Univ. New Hampshire: -- Acidic Trace files (All: 3-19) were submitted on 1/17/97. All were accepted and placed in the Final Archive. -- Talbot submitted Aerosol files (All: 3-19) on 1/27/97. All were accepted and placed in the Final Archive. CHANGES -- Talbot re-submitted Aerosol files (All: 3-19) on 6/6/97. All were accepted and placed in the Final Archive. Reasons: we have looked at the aerosol data and come to the conclusion that providing LOD's for each sample is not a good way to go. An average LOD for each species is provided instead. CHANGES* -- Talbot re-submitted Aerosol file 3-13 on 12/22/97. All were accepted and placed in the Final Archive. Reasons: The updated files for PEM Tropics aerosols reflect the addition of Pb-210 activity data. Our technique for measuring Pb-210 at very low levels involves alpha counting of the daughter Po-210. We need to let the daughter "grow in" to near equilibrium with the parent before making the measurement. After 10-11 months of elapsed time since collection, the samples are within 90% of this equilibrium, so we begin the analysis at that point. However, the amounts of Pb-210 (hence Po-210) in our small volume samples are still quite low, requiring counting times of 3-5 days for each sample in order to bring uncertainties due to counting statistics down to or below 20%. Fortunately, we can count 4 samples at once, so our throughput averages 1 sample/day. Analysis of the samples from remaining flights (14-19) is ongoing and updated files will be archived as each flight is completed. Jack Dibb -- Talbot re-submitted Aerosol file 14 on 12/29/97. Reasons: See CHANGES* above. -- Talbot re-submitted Aerosol files 15 and 16 on 1/20/98. Reasons: See CHANGES* above. -- Talbot re-submitted Aerosol files 17 on 1/30/98. Reasons: See CHANGES* above. -- Talbot re-submitted Aerosol files 18 on 2/16/98. Reasons: See CHANGES* above. -- Talbot re-submitted Aerosol files 19 on 2/26/98. Reasons: See CHANGES* above. ----------------------------------------------------------------------------- 1.2 Project - LaRC/NASA -- Project submitted files (All: 3-19) on 1/27/97. All were accepted and placed in the Final Archive. CHANGES -- Project re-submitted All Files on 2/20/97. Variables were reduced to 49 -- SH1011, VPPW, RHI, RHW were removed because the 2-stage and 3-stage hygrometers (DP1011 and DP300) were, at times, inconsistent and operating beyond their respective limits. Thus, the generated ProjDP (project Dew Point) represents the best of the 3 Dew points (DP1011, DP300, and DPCRYO). Also, MRProjDP (Mixing Ratio) was calculated from ProjDP and replaced MRCRYO (CRYO Mixing Ratio). The new data set is much cleaner where missing data points have been replaced with good data from DADS files. Up to 10 seconds interpolation was applied to the CRYO and JNO2 data when considered appropriate. CHANGES -- Project re-submitted All Files on 3/18/97. Changes were made to ALTP and ALTR variables. Previous ALTP and ALTR values were limited to approx. 32700 feet. This limitation has been corrected and ALTP and ALTR above 32700 feet now contain actual data instead of NULL Values. ----------------------------------------------------------------------------- 1.0 Fuelberg - FSU: -- Trajectory files (All: 3-19) were re-submitted on 3/4/97. All were accepted and placed in the Final Archive. ===============================================================================