A two-channel, tunable diode laser-based hygrometer for measurement of water vapor and cirrus cloud ice water content in the upper troposphere and lower stratosphere

Thornberry, T. D.; Rollins, A. W.; Gao, R. S.; Watts, L. A.; Ciciora, S. J.; McLaughlin, R. J.; Fahey, D. W.

doi:10.5194/amt-8-211-2015

Articles | Volume 8, issue 1

https://doi.org/10.5194/amt-8-211-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/amt-8-211-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 8, issue 1

Research article

|

12 Jan 2015

Research article |

| 12 Jan 2015

A two-channel, tunable diode laser-based hygrometer for measurement of water vapor and cirrus cloud ice water content in the upper troposphere and lower stratosphere

T. D. Thornberry, A. W. Rollins, R. S. Gao, L. A. Watts, S. J. Ciciora, R. J. McLaughlin, and D. W. Fahey

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Apr 2015	48	12	1	61
May 2015	18	10	2	30
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Cumulative views and downloads (calculated since 11 Aug 2014)

Month	HTML	PDF	XML	Total
Aug 2014	52	73	1	126
Sep 2014	20	39	1	60
Oct 2014	21	13	0	34
Nov 2014	12	18	1	31
Dec 2014	6	9	0	15
Jan 2015	64	73	1	138
Feb 2015	17	16	1	34
Mar 2015	31	11	2	44
Apr 2015	48	12	1	61
May 2015	18	10	2	30
Jun 2015	24	12	0	36
Jul 2015	29	16	0	45
Aug 2015	16	18	0	34
Sep 2015	12	9	0	21
Oct 2015	22	11	0	33
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Oct 2025	29	23	1	53
Nov 2025	24	14	4	42

Latest update: 23 Nov 2025

Short summary

The two-channel NOAA Water instrument was developed for in situ measurement of water vapor and cirrus cloud ice water content (IWC) in the upper troposphere and lower stratosphere. Tunable diode laser absorption is used to achieve accurate measurements at part per million H2O and low µg/m3 IWC. This paper reports the instrument’s design and performance achieved during its first aircraft deployment on the NASA Global Hawk during the 2013 ATTREX mission in the tropical tropopause layer.