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:20060321
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 

057047 080 2006 03 21 15 50 47 +19.70 +98.98   2.27 46.54
99999 99999 99999 99999 00322 00032 99999 99999 00317 00040 01561 00239 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 300850 63693 99999 99999 99999 99999 00785 00111 
00477 00086 99999 99999 99999 99999 99999 99999 00110 00023 99999 99999 
99999 99999 99999 99999 
057630 080 2006 03 21 16 00 30 +19.70 +98.98   2.27 44.39
99999 99999 99999 99999 00479 00053 99999 99999 00320 00041 01640 00254 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 309630 65809 99999 99999 99999 99999 00815 00114 
00498 00092 99999 99999 99999 99999 99999 99999 00111 00023 99999 99999 
99999 99999 99999 99999 
057861 080 2006 03 21 16 04 22 +19.70 +98.98   2.27 43.54
99999 99999 00681 00093 99999 99999 00493 00062 99999 99999 99999 99999 
00670 00059 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00933 00135 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00380 00055 99999 99999 99999 99999 02626 00609 
00133 00025 01430 00191 
058280 080 2006 03 21 16 11 20 +19.70 +98.98   2.27 42.03
99999 99999 00657 00080 99999 99999 00477 00060 99999 99999 99999 99999 
00754 00068 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00865 00124 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00286 00041 99999 99999 99999 99999 01472 00317 
00180 00035 01430 00191 
060187 080 2006 03 21 16 43 07 +19.70 +98.98   2.27 35.30
99999 99999 99999 99999 00205 00017 99999 99999 00289 00036 01672 00258 
99999 99999 99999 99999 35761 07626 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 312860 66430 99999 99999 01575 00244 00824 00116 
00505 00094 99999 99999 99999 99999 00356 00080 00111 00023 99999 99999 
99999 99999 99999 99999 
060439 080 2006 03 21 16 47 20 +19.70 +98.98   2.27 34.44
99999 99999 00680 00088 99999 99999 00493 00062 99999 99999 99999 99999 
00644 00057 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00813 00116 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00297 00042 99999 99999 99999 99999 01629 00353 
00154 00030 01430 00191 
061834 080 2006 03 21 17 10 35 +19.70 +98.98   2.27 29.89
99999 99999 99999 99999 00201 00016 99999 99999 00313 00040 01656 00254 
99999 99999 99999 99999 35408 07540 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 314150 66713 99999 99999 01713 00267 00825 00116 
00469 00084 99999 99999 99999 99999 00356 00080 00111 00023 99999 99999 
99999 99999 99999 99999 
062086 080 2006 03 21 17 14 46 +19.70 +98.98   2.27 29.12
99999 99999 00688 00088 99999 99999 00492 00061 99999 99999 99999 99999 
00707 00063 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00803 00115 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00286 00040 99999 99999 99999 99999 02317 00527 
00115 00022 01430 00191 
063103 080 2006 03 21 17 31 43 +19.70 +98.98   2.27 26.16
99999 99999 00692 00090 99999 99999 00489 00061 99999 99999 99999 99999 
00829 00075 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00743 00104 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00299 00042 99999 99999 99999 99999 00693 00149 
00095 00017 01430 00191 
063270 080 2006 03 21 17 34 30 +19.70 +98.98   2.27 25.70
99999 99999 99999 99999 00208 00017 99999 99999 00273 00034 01613 00246 
99999 99999 99999 99999 35762 07632 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 318280 67654 99999 99999 01593 00248 00776 00110 
00537 00102 99999 99999 99999 99999 00355 00080 00111 00023 99999 99999 
99999 99999 99999 99999 
072783 080 2006 03 21 20 13 03 +19.70 +98.98   2.27 29.16
99999 99999 99999 99999 00199 00016 99999 99999 00321 00042 01638 00249 
99999 99999 99999 99999 30169 06919 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 276480 57425 99999 99999 01496 00226 00814 00115 
00467 00084 99999 99999 99999 99999 00349 00078 00112 00024 99999 99999 
99999 99999 99999 99999 
072966 080 2006 03 21 20 16 06 +19.70 +98.98   2.27 29.72
99999 99999 00689 00094 99999 99999 00500 00061 99999 99999 99999 99999 
00694 00062 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01007 00142 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00421 00061 99999 99999 99999 99999 01538 00338 
00069 00012 01430 00191 
073386 080 2006 03 21 20 23 06 +19.70 +98.98   2.27 31.07
99999 99999 00683 00092 99999 99999 00496 00061 99999 99999 99999 99999 
00772 00069 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 01001 00141 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00416 00060 99999 99999 99999 99999 01921 00431 
00050 00009 01430 00191 
073590 080 2006 03 21 20 26 30 +19.70 +98.98   2.27 31.69
99999 99999 99999 99999 00217 00018 99999 99999 00329 00044 01689 00260 
99999 99999 99999 99999 29533 06924 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 272050 56372 99999 99999 01535 00232 00831 00117 
00473 00085 99999 99999 99999 99999 00346 00078 00114 00024 99999 99999 
99999 99999 99999 99999 
075132 080 2006 03 21 20 52 12 +19.70 +98.98   2.27 36.88
99999 99999 00685 00090 99999 99999 00491 00062 99999 99999 99999 99999 
00753 00067 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 00970 00138 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 00447 00065 99999 99999 99999 99999 02729 00646 
00094 00017 01430 00191 
075348 080 2006 03 21 20 55 48 +19.70 +98.98   2.27 37.63
99999 99999 99999 99999 00238 00021 99999 99999 00322 00042 02027 00329 
99999 99999 99999 99999 33600 07293 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 315740 66988 99999 99999 01671 00259 00830 00118 
00534 00101 99999 99999 99999 99999 00354 00080 00113 00024 99999 99999 
99999 99999 99999 99999 
