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:20060312
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 

078740 071 2006 03 12 21 52 20 +19.70 +98.98   2.27 51.04
99999 99999 99999 99999 99999 99999 99999 99999 00296 00037 01823 00290 
99999 99999 99999 99999 23186 05580 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 197861 39630 99999 99999 01429 00224 00804 00111 
00582 00114 99999 99999 99999 99999 00322 00071 00135 00029 99999 99999 
99999 99999 99999 99999 
079280 071 2006 03 12 22 01 20 +19.70 +98.98   2.27 53.03
99999 99999 00747 00083 99999 99999 00499 00062 99999 99999 99999 99999 
00693 00061 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01151 00169 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00805 00122 99999 99999 99999 99999 03160 00772 
00092 00017 99999 99999 
080794 071 2006 03 12 22 26 34 +19.70 +98.98   2.27 58.08
99999 99999 00760 00081 99999 99999 00496 00063 99999 99999 99999 99999 
00636 00056 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01139 00166 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00784 00119 99999 99999 99999 99999 03275 00810 
00081 00014 99999 99999 
081326 071 2006 03 12 22 35 26 +19.70 +98.98   2.27 60.67
99999 99999 99999 99999 99999 99999 99999 99999 00295 00036 01818 00291 
99999 99999 99999 99999 24754 07274 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 207851 41789 99999 99999 01419 00214 00820 00113 
00601 00119 99999 99999 99999 99999 00309 00068 00143 00031 99999 99999 
99999 99999 99999 99999 
081983 071 2006 03 12 22 46 23 +19.70 +98.98   2.27 62.57
99999 99999 99999 99999 99999 99999 99999 99999 00300 00037 01799 00287 
99999 99999 99999 99999 25296 07704 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 212360 42791 99999 99999 01413 00212 00828 00114 
00597 00118 99999 99999 99999 99999 00313 00069 00141 00031 99999 99999 
99999 99999 99999 99999 
082402 071 2006 03 12 22 53 22 +19.70 +98.98   2.27 64.76
99999 99999 00764 00076 99999 99999 00491 00062 99999 99999 99999 99999 
00629 00056 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01128 00163 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00822 00124 99999 99999 99999 99999 03313 00816 
00089 00016 99999 99999 
086446 071 2006 03 12 24 00 46 +19.70 +98.98   2.27 79.78
99999 99999 99999 99999 99999 99999 99999 99999 00313 00039 01820 00295 
99999 99999 99999 99999 27991 10582 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 224840 45920 99999 99999 01494 00219 00842 00117 
00607 00120 99999 99999 99999 99999 00310 00068 00185 00041 99999 99999 
99999 99999 99999 99999 
087233 071 2006 03 12 24 13 53 +19.70 +98.98   2.27 82.92
99999 99999 00758 00064 99999 99999 00510 00068 99999 99999 99999 99999 
00659 00062 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01000 00136 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00476 00069 99999 99999 99999 99999 03045 00712 
00137 00025 99999 99999 
088053 071 2006 03 12 24 27 33 +19.70 +98.98   2.27 86.14
99999 99999 99999 99999 99999 99999 99999 99999 00313 00039 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 
