Atmospheric Transmittance

Atmospheric Transmittance @ TAO site†

This page provides the atmospheric transmittance expected at the TAO site. All data were calculated by the ATRAN model (Lord, S. D., 1992, NASA Technical Memorandum 103957) running on a NASA website. At the TAO site, precipitable water vapor (PWV) is expected to be 0.3 to 1.5 mm, and atmospheric transmission curves toward the zenith for PWVs of 0.3, 0.5, 0.7, 0.9, 1.2, and 1.5 mm are shown below.

• NIR (1-6 um)
• MIR N-band (6-15 um)
• MIR Q-band (15-27 um)
• MIR 30-um band (27-40 um)

NIR (1-6 um)†

Overview†

Near-infrared atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.002 um-1.	Atmospheric transmittance around 2.7 um smoothed with a Gaussian function with an FWHM of 0.00056 um-1.

Data†

PWV (mm)	Resolution
	No Smoothing	0.00056 um-1	0.002 um-1
0.3	data	data	data
0.5	data	data	data
0.7	data	data	data
0.9	data	data	data
1.2	data	data	data
1.5	data	data	data

MIR N-band (6-15 um)†

Overview†

N-band atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.0005 um-1.

Data†

PWV (mm)	Resolution
	No Smoothing	0.0005 um-1
0.3	data	data
0.5	data	data
0.7	data	data
0.9	data	data
1.2	data	data
1.5	data	data

MIR Q-band (15-27 um)†

Overview†

Q-band atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.0005 um-1.

Data†

PWV (mm)	Resolution
	No Smoothing	0.0005 um-1
0.3	data	data
0.5	data	data
0.7	data	data
0.9	data	data
1.2	data	data
1.5	data	data

MIR 30um-band (26-40 um)†

Overview†

Atmospheric transmittance at the 30-um band.

Data†

PWV (mm)	Resolution
	No Smoothing
0.3	data
0.5	data
0.7	data
0.9	data
1.2	data
1.5	data

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