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:20060329
1 1
2006 03 31   2006 03 31
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 

056045 088 2006 03 29 15 34 05 +19.70 +98.98   2.27 48.43
99999 99999 00746 00080 99999 99999 00486 00061 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00813 00115 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 02349 00528 
00130 00025 01430 00191 
056234 088 2006 03 29 15 37 14 +19.70 +98.98   2.27 47.71
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 45754 10353 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 396280 91006 99999 99999 99999 99999 99999 99999 
00497 00092 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 
058595 088 2006 03 29 16 16 35 +19.70 +98.98   2.27 38.83
99999 99999 99999 99999 99999 99999 99999 99999 00305 00038 02177 00361 
99999 99999 99999 99999 44053 09854 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 346690 75340 99999 99999 01691 00265 00804 00114 
00503 00093 99999 99999 99999 99999 00359 00081 00110 00023 99999 99999 
99999 99999 99999 99999 
058802 088 2006 03 29 16 20 02 +19.70 +98.98   2.27 38.07
99999 99999 00694 00080 99999 99999 00481 00061 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00806 00115 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 02412 00548 
00146 00028 01430 00191 
061388 088 2006 03 29 17 03 09 +19.70 +98.98   2.27 28.90
99999 99999 00695 00084 99999 99999 00489 00061 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00770 00110 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 02715 00642 
00156 00030 01430 00191 
061556 088 2006 03 29 17 05 57 +19.70 +98.98   2.27 28.34
99999 99999 99999 99999 99999 99999 99999 99999 00322 00041 02312 00387 
99999 99999 99999 99999 41949 09336 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 339840 73474 99999 99999 01984 00315 00830 00118 
00512 00096 99999 99999 99999 99999 00358 00081 00111 00023 99999 99999 
99999 99999 99999 99999 
074225 088 2006 03 29 20 37 05 +19.70 +98.98   2.27 32.51
99999 99999 99999 99999 99999 99999 99999 99999 00313 00039 02211 00365 
99999 99999 99999 99999 36932 07961 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 312470 66528 99999 99999 01783 00278 00838 00119 
00551 00106 99999 99999 99999 99999 00356 00080 00111 00024 99999 99999 
99999 99999 99999 99999 
074400 088 2006 03 29 20 40 00 +19.70 +98.98   2.27 33.13
99999 99999 00704 00085 99999 99999 00487 00061 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00900 00129 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 02531 00587 
00103 00019 01430 00191 
