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:20060315
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 

072596 074 2006 03 15 20 09 56 +19.70 +98.98   2.27 29.97
99999 99999 99999 99999 99999 99999 99999 99999 00288 00036 01756 00276 
99999 99999 99999 99999 32884 06923 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 282390 59232 99999 99999 01557 00240 00810 00114 
00554 00106 99999 99999 99999 99999 00352 00079 00111 00024 99999 99999 
99999 99999 99999 99999 
072780 074 2006 03 15 20 13 00 +19.70 +98.98   2.27 30.49
99999 99999 00694 00090 99999 99999 00500 00062 99999 99999 99999 99999 
00774 00070 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00845 00120 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00348 00050 99999 99999 99999 99999 02233 00507 
00083 00015 99999 99999 
073238 074 2006 03 15 20 20 38 +19.70 +98.98   2.27 31.86
99999 99999 00707 00091 99999 99999 00496 00062 99999 99999 99999 99999 
00736 00065 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00861 00123 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00364 00052 99999 99999 99999 99999 02587 00606 
00088 00016 99999 99999 
076812 074 2006 03 15 21 20 12 +19.70 +98.98   2.27 43.70
99999 99999 99999 99999 99999 99999 99999 99999 00297 00037 01736 00272 
99999 99999 99999 99999 31047 06751 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 279680 58356 99999 99999 01733 00268 00820 00114 
00531 00100 99999 99999 99999 99999 00348 00078 00113 00024 99999 99999 
99999 99999 99999 99999 
077027 074 2006 03 15 21 23 47 +19.70 +98.98   2.27 44.45
99999 99999 00724 00086 99999 99999 00497 00062 99999 99999 99999 99999 
00700 00062 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01006 00145 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00497 00074 99999 99999 99999 99999 02658 00622 
00113 00021 99999 99999 
