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:20060318
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 

055528 077 2006 03 18 15 25 28 +19.70 +98.98   2.27 52.90
99999 99999 99999 99999 00389 00042 99999 99999 00300 00037 01614 00251 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 182610 37514 99999 99999 01178 00185 00780 00106 
00508 00094 99999 99999 99999 99999 00336 00075 00152 00033 99999 99999 
99999 99999 99999 99999 
055712 077 2006 03 18 15 28 32 +19.70 +98.98   2.27 52.23
99999 99999 00798 00089 99999 99999 00516 00064 99999 99999 99999 99999 
00595 00053 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01113 00162 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00536 00080 99999 99999 99999 99999 01429 00323 
00153 00028 01430 00191 
057681 077 2006 03 18 16 01 22 +19.70 +98.98   2.27 44.97
99999 99999 99999 99999 00333 00042 99999 99999 00305 00038 01571 00239 
99999 99999 99999 99999 20747 03596 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 166050 33719 99999 99999 01311 00210 00783 00106 
00486 00089 99999 99999 99999 99999 00335 00075 00129 00028 99999 99999 
99999 99999 99999 99999 
057864 077 2006 03 18 16 04 24 +19.70 +98.98   2.27 44.31
99999 99999 00720 00089 99999 99999 00510 00063 99999 99999 99999 99999 
00794 00072 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01092 00160 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00430 00064 99999 99999 99999 99999 01700 00382 
00134 00025 01430 00191 
059554 077 2006 03 18 16 32 35 +19.70 +98.98   2.27 38.32
99999 99999 99999 99999 00269 00023 99999 99999 00297 00037 01589 00242 
99999 99999 99999 99999 19796 03001 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 162790 33014 99999 99999 01484 00257 00804 00110 
00540 00103 99999 99999 99999 99999 00328 00073 00128 00028 99999 99999 
99999 99999 99999 99999 
059729 077 2006 03 18 16 35 30 +19.70 +98.98   2.27 37.72
99999 99999 00700 00091 99999 99999 00505 00063 99999 99999 99999 99999 
00712 00064 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00999 00150 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00203 00028 99999 99999 99999 99999 01046 00222 
00147 00028 01430 00191 
061474 077 2006 03 18 17 04 34 +19.70 +98.98   2.27 31.97
99999 99999 99999 99999 00287 00028 99999 99999 00307 00039 01934 00310 
99999 99999 99999 99999 20042 03070 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 166890 33889 99999 99999 01642 00282 00852 00121 
00501 00093 99999 99999 99999 99999 00312 00069 00141 00031 99999 99999 
99999 99999 99999 99999 
061663 077 2006 03 18 17 07 44 +19.70 +98.98   2.27 31.38
99999 99999 00698 00092 99999 99999 00507 00063 99999 99999 99999 99999 
00838 00076 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00908 00140 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00211 00029 99999 99999 99999 99999 99999 99999 
00158 00031 01430 00191 
073147 077 2006 03 18 20 19 07 +19.70 +98.98   2.27 30.91
99999 99999 99999 99999 00301 00033 99999 99999 00310 00039 02330 00389 
99999 99999 99999 99999 28711 05832 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 257620 53356 99999 99999 02118 00329 00824 00116 
00630 00126 99999 99999 99999 99999 00342 00077 00122 00026 99999 99999 
99999 99999 99999 99999 
073329 077 2006 03 18 20 22 09 +19.70 +98.98   2.27 31.47
99999 99999 00736 00098 99999 99999 00493 00062 99999 99999 99999 99999 
00814 00074 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01072 00155 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00532 00079 99999 99999 99999 99999 02976 00726 
00103 00019 01430 00191 
075278 077 2006 03 18 20 54 38 +19.70 +98.98   2.27 37.86
99999 99999 99999 99999 00248 00020 99999 99999 00295 00036 01957 00314 
99999 99999 99999 99999 26693 05798 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 238300 48754 99999 99999 01674 00254 00813 00112 
00594 00117 99999 99999 99999 99999 00337 00075 00126 00027 99999 99999 
99999 99999 99999 99999 
075468 077 2006 03 18 20 57 48 +19.70 +98.98   2.27 38.52
99999 99999 00732 00095 99999 99999 00491 00062 99999 99999 99999 99999 
00806 00073 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01117 00163 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00651 00098 99999 99999 99999 99999 03014 00730 
00112 00021 01430 00191 
076900 077 2006 03 18 21 21 40 +19.70 +98.98   2.27 43.58
99999 99999 00754 00093 99999 99999 00492 00061 99999 99999 99999 99999 
00745 00067 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01104 00161 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00586 00088 99999 99999 99999 99999 02988 00718 
00123 00023 01430 00191 
077093 077 2006 03 18 21 24 53 +19.70 +98.98   2.27 44.27
99999 99999 99999 99999 00263 00023 99999 99999 00292 00036 02008 00326 
99999 99999 99999 99999 27348 06318 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 243810 50028 99999 99999 01912 00296 00824 00114 
00592 00116 99999 99999 99999 99999 00339 00076 00122 00026 99999 99999 
99999 99999 99999 99999 
078565 077 2006 03 18 21 49 25 +19.70 +98.98   2.27 49.67
99999 99999 99999 99999 00270 00024 99999 99999 00290 00036 01932 00311 
99999 99999 99999 99999 25922 06666 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 225980 45915 99999 99999 01572 00236 00840 00117 
00587 00115 99999 99999 99999 99999 00330 00073 00130 00028 99999 99999 
99999 99999 99999 99999 
078757 077 2006 03 18 21 52 37 +19.70 +98.98   2.27 50.38
99999 99999 00805 00094 99999 99999 00501 00062 99999 99999 99999 99999 
00736 00066 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01145 00167 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00741 00112 99999 99999 99999 99999 02707 00631 
00124 00023 01431 00191 
079491 077 2006 03 18 22 04 51 +19.70 +98.98   2.27 53.13
99999 99999 00813 00093 99999 99999 00501 00062 99999 99999 99999 99999 
00750 00067 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01154 00168 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00788 00119 99999 99999 99999 99999 02945 00700 
00138 00026 01431 00191 
079674 077 2006 03 18 22 07 54 +19.70 +98.98   2.27 53.82
99999 99999 99999 99999 00260 00021 99999 99999 00295 00036 02077 00340 
99999 99999 99999 99999 24506 06614 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 212630 42899 99999 99999 01659 00256 00813 00111 
00614 00122 99999 99999 99999 99999 00321 00071 00147 00032 99999 99999 
99999 99999 99999 99999 
080571 077 2006 03 18 22 22 51 +19.70 +98.98   2.27 57.21
99999 99999 00824 00092 99999 99999 00505 00063 99999 99999 99999 99999 
00707 00063 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01156 00168 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00861 00130 99999 99999 99999 99999 02824 00661 
00133 00025 01431 00191 
080748 077 2006 03 18 22 25 48 +19.70 +98.98   2.27 57.89
99999 99999 99999 99999 00262 00023 99999 99999 00294 00036 01989 00323 
99999 99999 99999 99999 23658 06400 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 203211 40754 99999 99999 01620 00254 00805 00110 
00619 00123 99999 99999 99999 99999 00318 00070 00152 00033 99999 99999 
99999 99999 99999 99999 
