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ATMOS Level 2 Data


ATMOS Version 2 Release - 10/25/95

Directory Architecture:

The AMES files have been created and uplinked to the DAAC independently from the other files in the release. The other files have been placed in the following directories: 

*.mol           ./pub/atmos/version2/P_gridded/"mission"/"molecule"
*.ocn           ./pub/atmos/version2/P_gridded/"mission"/ocn_files
*.ptmol	        ./pub/atmos/version2/Pt_gridded/"mission"-pt/"molecule"
*.ptocn         ./pub/atmos/version2/Pt_gridded/"mission"-pt/pto_files

You can find the results by anonymous ftp to thunder.jpl.nasa.gov/atmos/version2.

Description of Products

-----------------------

Molecule Files

--------------
The two lowest-level file types are "gridded data products". These two file types contain height, pressure, temperature, VMR, VMR Error, and potential temperature. One has all quantities projected onto a standard pressure grid (*.mol files), and the other has quantities mapped onto a potential temperature grid (*.ptmol files). The format of these two files is identical. There is one file per molecule per occultation.

The pressure-gridded product described above ("mol file") has been changed from the version #1 delivery "atm" file in two ways. 1) The pressure grid is no longer extended at the top and bottom by extrapolation. This results in two fewer data points in each "mol" file compared with the version #1 offerings; 2) a potential temperature column has been added as a sixth column.

Figure #1 - Sample Pressure Gridded Data Product (*.mol file)

------------------------------------------------------------- 

hcl.at2.f3.ss06.-49.273.2c.v2.mol Wed May 17 12:32:45 1995 
Results from the Atmospheric Trace Molecule Spectroscopy Experiment (ATMOS)      
Experiment NASA Jet Propulsion Laboratory Data version: "v2" May 11, 1995      
Data type: 2C: smoothed and interpolated onto a pressure grid (12 levels per      
pressure decade) 
 ATMOS Data Processing Facility Source File: 
     /results/vers2/at2/hcl/work/hcl.at2.f3.ss06.tlb.040495.stats.v2 
 Pressure Error File: 
     /results/vers2/at2/ht_err.f3 

Source information:  date      gmt    ter lat ter lon   beta   A/D  position
#                    08APR1993 231337 491856S 0864255W  22.61 A  3     M
Latitude and longitude of 30 km tangent height:           -49.4,  273.2

Ht         Pres       Temp        VMR        VMR ERR    Theta
(km)       (bars)     (K)         (ppV)      (ppV)      (K)
>
 50.65  6.8129e-04 257.556   3.78326e-09   3.69223e-10   2072.9
 49.18  8.2540e-04 258.129   3.72436e-09   3.75603e-10   1966.7
 47.70  1.0000e-03 258.560   3.70459e-09   2.39303e-10   1864.7
 46.23  1.2115e-03 258.727   3.59340e-09   2.05884e-10   1766.3
 44.76  1.4678e-03 258.800   3.24374e-09   1.86861e-10   1672.5
 43.29  1.7783e-03 255.269   2.77685e-09   1.48392e-10   1561.7
 41.86  2.1544e-03 249.335   2.50477e-09   1.32120e-10   1444.1
 40.45  2.6102e-03 243.353   2.50882e-09   1.28216e-10   1333.8
 39.08  3.1623e-03 239.813   2.63266e-09   1.02563e-10   1244.5
 37.72  3.8312e-03 237.990   2.68511e-09   1.00611e-10   1169.0
 36.38  4.6416e-03 236.014   2.63943e-09   1.00428e-10   1097.3
 35.04  5.6234e-03 233.921   2.54453e-09   1.13035e-10   1029.7
 33.72  6.8129e-03 231.907   2.42164e-09   1.06435e-10    966.2
>

Figure #2 - Sample Potential Temperature Gridded Data Product (*.ptmol file)

----------------------------------------------------------------------------

(This figure is 103 characters wide - please view accordingly)

hf.at3.f4.sr31.-68.101.2c.v2.ptmol Mon May 15 13:15:54 1995 

 Results from the Atmospheric Trace Molecule Spectroscopy Experiment (ATMOS)
 Experiment NASA Jet Propulsion Laboratory Data version: "v2" May 11, 1995      
 Data type: 2I: smoothed and interpolated onto a theta grid (12 levels per      
 pressure decade)    
 ATMOS Data Processing Facility Source File: 
     /results/vers2/at3-pt/hf/work/hf.at3.f4.sr31.tlb.021995.stats.v2    
 Pressure Error File: 
     /results/vers2/at3-pt/ht_err.f4    
Source information:  date      gmt    ter lat ter lon   beta   A/D  position
#                    06NOV1994 195534 685024S 0991631E -40.54 D  4
Latitude and longitude of 30 km tangent height:           -68.4,  100.6
 
Ht         Pres       Temp        VMR        VMR ERR    Theta
(km)       (bars)     (K)         (ppV)      (ppV)      (K)
>
 51.06  8.4873e-04 271.110   1.57572e-09   2.31693e-10   2050.0
 49.55  1.0206e-03 271.973   1.60138e-09   1.55027e-10   1950.0
 48.01  1.2371e-03 272.498   1.57552e-09   1.23433e-10   1850.0
 46.43  1.5020e-03 272.586   1.45470e-09   9.25183e-11   1750.0
 44.83  1.8333e-03 271.996   1.30499e-09   7.13251e-11   1650.0
 43.25  2.2287e-03 270.206   1.31181e-09   6.59365e-11   1550.0
 41.68  2.7138e-03 267.443   1.46442e-09   7.15862e-11   1450.0
 40.07  3.3330e-03 264.008   1.46911e-09   7.00495e-11   1350.0
 38.39  4.1304e-03 260.007   1.23638e-09   4.90441e-11   1250.0
 36.79  5.1042e-03 254.071   1.02203e-09   3.82400e-11   1150.0
 34.98  6.5117e-03 248.670   9.21810e-10   3.41364e-11   1050.0
 33.28  8.2203e-03 245.596   8.91310e-10   3.34746e-11    970.0
 31.66  1.0279e-02 242.942   8.77938e-10   3.40376e-11    900.0
 30.36  1.2325e-02 241.673   8.33592e-10   3.23512e-11    850.0
 28.98  1.4981e-02 240.430   7.36078e-10   2.89914e-11    800.0
 27.51  1.8374e-02 239.114   6.27438e-10   3.02408e-11    750.0
 26.28  2.1931e-02 238.003   5.74273e-10   2.84701e-11    710.0
 24.98  2.6423e-02 236.834   5.35491e-10   2.98054e-11    670.0
 23.59  3.2200e-02 235.766   4.80181e-10   2.77392e-11    630.0
 22.09  4.0025e-02 234.857   4.22831e-10   2.66930e-11    590.0
 20.70  4.8964e-02 234.098   4.00151e-10   2.38423e-11    555.0
 19.42  5.8934e-02 233.549   3.81405e-10   2.41304e-11    525.0
 18.10  7.1536e-02 232.637   3.23699e-10   2.44302e-11    495.0
 16.98  8.4267e-02 231.475   2.45876e-10   2.45835e-11    470.0
 15.82  9.9949e-02 230.149   1.55941e-10   2.27621e-11    445.0
 14.56  1.2026e-01 229.139   7.87164e-11   1.40952e-11    420.0
 13.22  1.4684e-01 228.052   4.60991e-11   9.34582e-12    395.0
 12.12  1.7330e-01 226.983   4.26679e-11   9.84120e-12    375.0
 11.28  1.9658e-01 225.945   4.46289e-11   1.26993e-11    360.0
 10.72  2.1391e-01 225.050   4.51776e-11   2.06534e-11    350.0
 10.15  2.3343e-01 224.102   4.20011e-11   2.75343e-11    340.0
  9.56  2.5461e-01 223.108   3.63615e-11   3.35698e-11    330.0
>


Occultation Files

-----------------
The gridded molecular files are merged on an individual occultation basis with UKMO potential vorticity (PV) and scaled potential vorticity (sPV) added (see ref.#8). As with the molecule files, the two files are gridded on pressure (*.ocn) and potential temperature (*.ptocn). (Fig.3,4)

The VMR and VMR Error are given a fixed location in each file, whether or not the actual values are retrieved. All levels in the defined grid are present in each file, whether or not there is data for each level. This results in a fixed number of data records for each file type. For species that are not retrieved for a given occultation, a filler value of -9999.0 is substituted. Missing height or temperature values are filled with -99.9

One change from the previous releases is in the header. If a molecule is not included in an ocn file, the header entry for that molecule will read:

"molecule"_XXXX instead of "molecule"_"occultation", e.g., o3_XXXX vs. o3_sr02

o3,n2o,ch4,hno3,h2o,hcl,hf,no,no2,f11,f12,f22,clono2,n2o5,sf6,ocs,hcn,hdo,h217o, h218o,ch3d,co,hno4,ccl4,c2h2,c2h6,ch3cl,cf4

Figure #3 - Sample Pressure Gridded Occultation Files (*.ocn file)

  at3sr01.ocn Mon Jul 10 16:47:56 1995 

 Pressure Gridded Constituent Profiles from the Atmospheric Trace Molecule 
    Spectroscopy (ATMOS) Experiment, NASA Jet Propulsion Laboratory 
 
Input Files                              Date Created
o3.at3.f3.sr01.-65.74.2c.v2.mol          Wed May 17 11:48:32 1995
n2o.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 11:50:18 1995
ch4.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 11:51:56 1995
hno3.at3.f3.sr01.-65.74.2c.v2.mol        Wed May 17 11:53:55 1995
h2o.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 11:55:46 1995
hcl.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 11:57:11 1995
no.at3.f3.sr01.-65.74.2c.v2.mol          Wed May 17 11:57:52 1995
no2.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 11:59:13 1995
ocs.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 12:04:33 1995
hcn.at3.f3.sr01.-65.74.2c.v2.mol         Wed May 17 12:05:16 1995
h2-17o.at3.f3.sr01.-65.74.2c.v2.mol      Wed May 17 12:06:24 1995
h2-18o.at3.f3.sr01.-65.74.2c.v2.mol      Wed May 17 12:07:26 1995
ch3d.at3.f3.sr01.-65.74.2c.v2.mol        Wed May 17 12:08:52 1995
co.at3.f3.sr01.-65.74.2c.v2.mol          Wed May 17 12:10:03 1995
ch3cl.at3.f3.sr01.-65.74.2c.v2.mol       Wed May 17 12:17:39 1995
Potential Vorticity (PV) and Scaled Potential Vorticity (SPV) courtesy of G. L. Manney at JPL, calculated from UKMO winds and temperatures (thanks to the UKMO, esp. R. Swinbank and A. ONeill). 
 
     Date    Time    Lat.   Long. Filter
# 03NOV1994 223009  -64.5    73.8   3
 
 
Units: Pressure (bars) Altitude (km) Temperature (K) PotTemp (K) PV (K-m**2/kg-sec) SPV (1.e-4/sec) VMR
 (ppV) VMR_ERR (ppV)
p_sr01 z_sr01 T_sr01 PT_sr01 PV_sr01 SPV_sr01 o3_sr01 o3_err_sr01 n2o_sr01 n2o_err_sr01 ch4_sr01 ... 
   2.1544e-07 101.43  188.0 15165.6  0.000e+00  0.000e+00 -9.999e+03 -9.999e+03 -9.999e+03 ...
   2.6102e-07 100.34  182.4 13924.6  0.000e+00  0.000e+00 -9.999e+03 -9.999e+03 -9.999e+03 ...
      .
      .
      .
(data chopped for display purposes...)

Figure #4 - Sample Potential Temperature Gridded Occultation Files(*.ptocn file) 

 at3sr01.pto Mon Jul 10 16:48:48 1995    
 Potential Temperature Gridded Constituent Profiles from the Atmospheric      
 Trace Molecule Spectroscopy (ATMOS) Experiment, NASA Jet Propulsion Laboratory    
Input Files                              Date Created

o3.at3.f3.sr01.-65.74.2c.v2.ptmol        Fri Jun 23 14:17:12 1995
n2o.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:04:48 1995
ch4.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:07:20 1995
hno3.at3.f3.sr01.-65.74.2c.v2.ptmol      Mon May 15 13:10:24 1995
h2o.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:12:36 1995
hcl.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:14:59 1995
no.at3.f3.sr01.-65.74.2c.v2.ptmol        Mon May 15 13:16:27 1995
no2.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:18:15 1995
ocs.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:24:37 1995
hcn.at3.f3.sr01.-65.74.2c.v2.ptmol       Mon May 15 13:25:36 1995
h2-17o.at3.f3.sr01.-65.74.2c.v2.ptmol    Mon May 15 13:26:42 1995
h2-18o.at3.f3.sr01.-65.74.2c.v2.ptmol    Mon May 15 13:27:34 1995
ch3d.at3.f3.sr01.-65.74.2c.v2.ptmol      Mon May 15 13:28:32 1995
co.at3.f3.sr01.-65.74.2c.v2.ptmol        Mon May 15 13:29:02 1995
ch3cl.at3.f3.sr01.-65.74.2c.v2.ptmol     Mon May 15 13:35:12 1995
Potential Vorticity (PV) and Scaled Potential Vorticity (SPV) courtesy of G. L. Manney at JPL, calculated from UKMO winds and temperatures (thanks to the UKMO, esp. R. Swinbank and A. ONeill). 
 
     Date    Time    Lat.   Long. Filter
# 03NOV1994 223009  -64.5    73.8   3
 
Units: Pressure (bars) Altitude (km) Temperature (K) PotTemp (K) PV (K-m**2/kg-sec) SPV (1.e-4/sec) VMR (ppV) VMR_ERR (ppV)
p_sr01 z_sr01 T_sr01 PT_sr01 PV_sr01 SPV_sr01 o3_sr01 o3_err_sr01 n2o_sr01 n2o_err_sr01 ch4_sr01 ...
   1.2459e-07 104.79  211.9 20000.0 -1.177e-06 -3.559e-01 -9.999e+03 -9.999e+03 -9.999e+03 ...
   1.4428e-07 103.86  204.4 18500.0 -3.125e-06 -8.348e-01 -9.999e+03 -9.999e+03 -9.999e+03 ...
      .
      .
      .
(data chopped for display purposes...)

Mission Files

The gridded occultation files are merged for each mission with columns of occultation, date, time, 30 km latitude, 30 km longitude, filter, UKMO potential vorticity (PV) and scaled potential vorticity (sPV) added (see ref.#8). As with the occultation files, the two files are gridded on pressure (*.mis) and potential temperature (*.ptmis).

The VMR and VMR Error are given a fixed location in each file, whether or not the actual values are retrieved. All levels in the defined grid are present in each file, whether or not there is data for each level. This results in a fixed number of data records for each file type. For species that are not retrieved for a given occultation, a filler value of -9999.9 is substituted. Missing height or temperature values are filled with -99.9

AMES Files

AMES files have been created for transfer to the Goddard DAAC in accordance with Ref #5. The files have been created using ODS2AMES (Ref.#6) and ancillary code. Each file contains ATMOS data, in AMES format, grouped by GMT day.

REFERENCES:


1) "Pressure Sensing with High Resolution Solar Absorption
Spectroscopy", submitted for publication in Applied Optics. M. C.
Abrams, C. B. Farmer, M. R. Gunson, L. L. Lowes, C. P. Rinsland, and
R. Zander.

2) "Stratospheric and Mesospheric Pressure-Temperature Profiles from the
Rotational Analysis of CO2 Lines of ATMOS/ATLAS-1 Observations",
G.P.Stiller, et al, J.Geophys.Res., 100, 3107-3118, 1995.

3) "Errors in Tp-gpa and P-sounding processes", AYC-94-01, A.Y.Chang /
M.C.Abrams, 16 December 1994, Sections 1)a), 1)b), and 2)a).

4) "Memo Regarding Changes in Smoothing Algorithm", Private
communication from A.Y.Chang, distributed to working group via e-mail
on 23 February 1995.

5) "Metadata Submission Requirements", GSFC DAAC, Science Support Group,
Version 1.1.

6) "Converting to AMES Data Format from ODS (ATMOS) Format", L.Bynum,
23 September, 1993.

7) "ATMOS Level 2 Version 2 Description", TLB-95-01, T.L.Brown,
M.R.Gunson, A.Y.Chang, 1995 May 9.

8) Potential Vorticity (PV) and Scaled Potential Vorticity (sPV) courtesy of
G. L. Manney at JPL, calculated from UKMO winds and temperatures (thanks to
the UKMO, esp. R. Swinbank and A. ONeill).'


You can find the results by anonymous ftp to thunder.jpl.nasa.gov/atmos/version2.

Go back to the previous page. File modified by: J. Foster 6-17-96 / Links updated by Bill Irion 3/19/01