124 1010
Coffey, Michael T. and James W. Hannigan
National Center for Atmospheric Research, Boulder, CO, USA 
Fourier transform spectrometer (FTS) from the T1 site in MILAGRO 
Observation date:20060320
1 1
2006 03 21   2006 03 21
0
Time (UT), seconds after 00:00 of observation date   
52
1e+12 1e+12 1e+16 1e+16 1e+13 1e+13 1e+16 1e+16 1e+17 1e+17 1e+15 1e+15 
1e+13 1e+13 1e+13 1e+13 1e+18 1e+18 1e+19 1e+19 1e+13 1e+13 1e+13 1e+13 
1e+13 1e+13 1e+13 1e+13 1e+17 1e+17 1e+17 1e+17 1e+13 1e+13 1e+13 1e+13 
1e+12 1e+12 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 1e+13 
1e+13 1e+13 1e+13 1e+13  
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999  
HF vertical column amount [molecules/cm**2]
HF estimated error in total column [molecules/cm**2]
O3 vertical column amount [molecules/cm**2]
O3 estimated error in total column [molecules/cm**2]
HCL vertical column amount [molecules/cm**2]
HCL estimated error in total column [molecules/cm**2]
N2O vertical column amount [molecules/cm**2]
N2O estimated error in total column [molecules/cm**2]
CH4 vertical column amount [molecules/cm**2]
CH4 estimated error in total column [molecules/cm**2]
CO vertical column amount [molecules/cm**2]
CO estimated error in total column [molecules/cm**2]
HNO3 vertical column amount [molecules/cm**2]
HNO3 estimated error in total column [molecules/cm**2]
CLONO2 vertical column amount [molecules/cm**2]
CLONO2 estimated error in total column [molecules/cm**2]
H2O vertical column amount [molecules/cm**2]
H2O estimated error in total column [molecules/cm**2]
N2 vertical column amount [molecules/cm**2]
N2 estimated error in total column [molecules/cm**2]
COF2 vertical column amount [molecules/cm**2]
COF2 estimated error in total column [molecules/cm**2]
NO vertical column amount [molecules/cm**2]
NO estimated error in total column [molecules/cm**2]
NO2 vertical column amount [molecules/cm**2]
NO2 estimated error in total column [molecules/cm**2]
CCL2F2 vertical column amount [molecules/cm**2]
CCL2F2 estimated error in total column [molecules/cm**2]
HDO vertical column amount [molecules/cm**2]
HDO estimated error in total column [molecules/cm**2]
CH3D vertical column amount [molecules/cm**2]
CH3D estimated error in total column [molecules/cm**2]
C2H6 vertical column amount [molecules/cm**2]
C2H6 estimated error in total column [molecules/cm**2]
OCS vertical column amount [molecules/cm**2]
OCS estimated error in total column [molecules/cm**2]
H2CO vertical column amount [molecules/cm**2]
H2CO estimated error in total column [molecules/cm**2]
HCN vertical column amount [molecules/cm**2]
HCN estimated error in total column [molecules/cm**2]
CCL3F vertical column amount [molecules/cm**2]
CCL3F estimated error in total column [molecules/cm**2]
C3H8 vertical column amount [molecules/cm**2]
C3H8 estimated error in total column [molecules/cm**2]
C2H2 vertical column amount [molecules/cm**2]
C2H2 estimated error in total column [molecules/cm**2]
NH3 vertical column amount [molecules/cm**2]
NH3 estimated error in total column [molecules/cm**2]
C2H4 vertical column amount [molecules/cm**2]
C2H4 estimated error in total column [molecules/cm**2]
PAN vertical column amount [molecules/cm**2]
PAN estimated error in total column [molecules/cm**2]
11
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
9999 9999 9999 9999 9999 9999 9999 9999 9999 9999 9999
Day of year of observation
Year of observation 
Month of observation 
Day of observation 
Hour of observation 
Minute of observation 
Second of observation 
Latitude of observation (degree N)
Longitude of observation (degree W)
Altitude of observation (km)       
Solar zenith angle (degree)
29
Data were taken by a 0.06cm-1 resolution Fourier transform spectrometer (FTS) operated
from a trailer situated(usually) at the T1 site of MILAGRO (19.7 N, 98.98 W).  The absorption
of infrared solar radiation along a slant path to the sun is recorded from 2 to 15 micrometers.
Two spectral filters are used to cover the region from 2-15 microns.  An interferogram is 
recorded in about 10 seconds.  Interferograms are transformed to produce spectra.  Column
amounts are retrieved by fitting the observed spectra using the non-linear least squares 
fitting code, SFIT2, that employs an Optimal Estimation retrieval algorithm.  Version 3.92 
of the SFIT2 code was used. The HITRAN absorption line list with updates to 2004 is used
in the forward calculation.  An average temperature profile was derived from NCEP analyses.  
Observations were made during sunlit hours throughout the day.  Vertical column amounts
are reported above the observing location.  Details of the instrumentation and method may
be found in:

Airborne spectroscopic observations of chlorine activation and de-nitrification in the 
1999/2000 winter Arctic stratosphere during SOLVE, M. T. Coffey, W. G. Mankin,
J. W. Hannigan, and G. C. Toon, J. Geophys. Res., 107, 8303, 2002.

Intercomparison of retrieval codes used for the analysis of high-resolution, ground-based 
FTIR measurements, F. Hase, J. W. Hannigan, M. T. Coffey, A. Goldman, M. Hopfner, 
N. B. Jones, C. P. Rinsland, S. W. Wood, Quant. Spectrosc. Radiat. Transfer, 87, 25-52, 2004.  

Contacts:
Michael T. Coffey
James W. Hannigan
National Center for Atmospheric Research
PO Box 3000
Boulder, CO 80307
303 497 1407
coffey@ucar.edu, jamesw@ucar.edu
7
SECONDS(UT) DOY YEAR MONTH DAY  HOUR MIN SEC  LAT LON ALT SZA
     HF ERR      O3 ERR     HCL ERR     N2O ERR     CH4 ERR      CO ERR 
   HNO3 ERR  CLONO2 ERR     H2O ERR      N2 ERR    COF2 ERR      NO ERR 
    NO2 ERR  CCL2F2 ERR     HDO ERR    CH3D ERR    C2H6 ERR     OCS ERR 
   H2CO ERR     HCN ERR   CCL3F ERR    C3H8 ERR    C2H2 ERR     NH3 ERR 
   C2H4 ERR     PAN ERR 

073476 079 2006 03 20 20 24 36 +19.70 +98.98   2.27 31.57
99999 99999 99999 99999 00229 00018 99999 99999 00314 00040 02604 00444 
99999 99999 99999 99999 25017 06126 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 222460 45189 99999 99999 01734 00263 00721 00098 
00680 00139 99999 99999 99999 99999 00323 00072 00181 00041 99999 99999 
99999 99999 99999 99999 
073665 079 2006 03 20 20 27 45 +19.70 +98.98   2.27 32.21
99999 99999 00737 00099 99999 99999 00514 00064 99999 99999 99999 99999 
00965 00090 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01064 00152 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00525 00078 99999 99999 99999 99999 01808 00410 
00115 00022 01430 00191 
075483 079 2006 03 20 20 58 03 +19.70 +98.98   2.27 38.26
99999 99999 00714 00097 99999 99999 00493 00061 99999 99999 99999 99999 
00908 00084 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01085 00156 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00585 00087 99999 99999 99999 99999 02251 00514 
00121 00023 01430 00191 
075685 079 2006 03 20 21 01 25 +19.70 +98.98   2.27 38.97
99999 99999 99999 99999 00230 00018 99999 99999 00306 00038 02592 00443 
99999 99999 99999 99999 27248 05879 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 247840 50897 99999 99999 01705 00257 00777 00108 
00677 00139 99999 99999 99999 99999 00334 00074 00142 00031 99999 99999 
99999 99999 99999 99999 
078597 079 2006 03 20 21 49 57 +19.70 +98.98   2.27 49.57
99999 99999 99999 99999 00223 00018 99999 99999 00307 00038 02266 00378 
99999 99999 99999 99999 31749 06897 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 288970 60676 99999 99999 01590 00240 00797 00112 
00665 00135 99999 99999 99999 99999 00350 00078 00118 00025 99999 99999 
99999 99999 99999 99999 
078806 079 2006 03 20 21 53 26 +19.70 +98.98   2.27 50.35
99999 99999 00774 00094 99999 99999 00489 00061 99999 99999 99999 99999 
00752 00067 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01019 00146 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00453 00066 99999 99999 99999 99999 02673 00621 
00113 00021 01430 00191 
079646 079 2006 03 20 22 07 26 +19.70 +98.98   2.27 53.51
99999 99999 00790 00092 99999 99999 00489 00061 99999 99999 99999 99999 
00751 00067 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01000 00143 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00426 00062 99999 99999 99999 99999 02896 00686 
00120 00022 01430 00191 
079873 079 2006 03 20 22 11 13 +19.70 +98.98   2.27 54.37
99999 99999 99999 99999 00228 00018 99999 99999 00309 00039 02124 00351 
99999 99999 99999 99999 33976 07273 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 307460 65283 99999 99999 01608 00246 00834 00117 
00643 00130 99999 99999 99999 99999 00354 00080 00115 00025 99999 99999 
99999 99999 99999 99999 
081023 079 2006 03 20 22 30 23 +19.70 +98.98   2.27 58.76
99999 99999 99999 99999 00224 00018 99999 99999 00311 00039 01997 00326 
99999 99999 99999 99999 35026 07486 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 310700 66217 99999 99999 01620 00249 00823 00115 
00604 00119 99999 99999 99999 99999 00355 00080 00114 00024 99999 99999 
99999 99999 99999 99999 
081236 079 2006 03 20 22 33 56 +19.70 +98.98   2.27 59.57
99999 99999 00825 00091 99999 99999 00505 00063 99999 99999 99999 99999 
00704 00062 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01005 00142 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00440 00064 99999 99999 99999 99999 02510 00574 
00132 00025 01430 00191 
083234 079 2006 03 20 23 07 14 +19.70 +98.98   2.27 67.27
99999 99999 00803 00081 99999 99999 00496 00062 99999 99999 99999 99999 
00669 00058 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00973 00136 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00384 00055 99999 99999 99999 99999 02556 00579 
00126 00023 01430 00191 
083780 079 2006 03 20 23 16 20 +19.70 +98.98   2.27 69.40
99999 99999 99999 99999 00221 00018 99999 99999 00307 00039 01916 00312 
99999 99999 99999 99999 33316 07284 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 292870 62186 99999 99999 01632 00249 00821 00115 
00596 00117 99999 99999 99999 99999 00354 00080 00119 00026 99999 99999 
99999 99999 99999 99999 
