Advancements, measurement uncertainties, and recent comparisons of the NOAA
frost point hygrometer

Hall, Emrys G.; Jordan, Allen F.; Hurst, Dale F.; Oltmans, Samuel J.; Vömel, Holger; Kühnreich, Benjamin; Ebert, Volker

doi:10.5194/amt-9-4295-2016

Articles | Volume 9, issue 9

https://doi.org/10.5194/amt-9-4295-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Water vapour in the upper troposphere and middle atmosphere:...

https://doi.org/10.5194/amt-9-4295-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 9, issue 9

Research article

|

05 Sep 2016

Research article |

| 05 Sep 2016

Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer

Emrys G. Hall, Allen F. Jordan, Dale F. Hurst, Samuel J. Oltmans, Holger Vömel, Benjamin Kühnreich, and Volker Ebert

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May 2016	71	25	2	98
Jun 2016	28	13	6	47
Jul 2016	13	8	4	25
Aug 2016	15	5	2	22
Sep 2016	75	27	7	109
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Feb 2017	8	9	2	19
Mar 2017	18	15	2	35
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Feb 2018	10	9	0	19
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May 2018	14	9	1	24
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Jul 2018	12	12	1	25
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Jan 2022	16	17	1	34
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Apr 2022	9	7	2	18
May 2022	9	9	1	19
Jun 2022	7	11	3	21
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Jan 2023	10	14	1	25
Feb 2023	16	9	3	28
Mar 2023	20	16	1	37
Apr 2023	12	18	1	31
May 2023	54	9	1	64
Jun 2023	70	7	0	77
Jul 2023	57	10	2	69
Aug 2023	51	13	4	68
Sep 2023	41	12	3	56
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Dec 2023	53	7	2	62
Jan 2024	44	4	0	48
Feb 2024	37	16	2	55
Mar 2024	44	15	4	63
Apr 2024	43	7	4	54
May 2024	18	16	4	38
Jun 2024	20	11	4	35
Jul 2024	24	8	2	34
Aug 2024	52	16	1	69
Sep 2024	11	10	0	21
Oct 2024	15	8	1	24
Nov 2024	31	14	1	46
Dec 2024	17	11	1	29
Jan 2025	19	15	5	39
Feb 2025	47	12	3	62
Mar 2025	39	17	1	57
Apr 2025	16	13	0	29
May 2025	23	16	0	39
Jun 2025	43	26	0	69
Jul 2025	34	20	5	59
Aug 2025	37	31	3	71
Sep 2025	58	32	2	92
Oct 2025	31	27	2	60
Nov 2025	48	15	2	65

Cumulative views and downloads (calculated since 17 May 2016)

Month	HTML	PDF	XML	Total
May 2016	71	25	2	98
Jun 2016	28	13	6	47
Jul 2016	13	8	4	25
Aug 2016	15	5	2	22
Sep 2016	75	27	7	109
Oct 2016	20	18	0	38
Nov 2016	15	16	0	31
Dec 2016	6	6	0	12
Jan 2017	17	9	0	26
Feb 2017	8	9	2	19
Mar 2017	18	15	2	35
Apr 2017	25	14	2	41
May 2017	28	15	1	44
Jun 2017	29	26	2	57
Jul 2017	14	11	0	25
Aug 2017	15	13	2	30
Sep 2017	16	10	0	26
Oct 2017	11	14	2	27
Nov 2017	8	13	0	21
Dec 2017	9	12	1	22
Jan 2018	15	11	3	29
Feb 2018	10	9	0	19
Mar 2018	18	9	1	28
Apr 2018	16	9	4	29
May 2018	14	9	1	24
Jun 2018	13	8	1	22
Jul 2018	12	12	1	25
Aug 2018	23	9	0	32
Sep 2018	18	12	1	31
Oct 2018	10	11	2	23
Nov 2018	10	10	3	23
Dec 2018	12	5	3	20
Jan 2019	16	13	0	29
Feb 2019	13	4	1	18
Mar 2019	18	11	1	30
Apr 2019	10	10	0	20
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Jun 2019	6	10	1	17
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Oct 2019	9	10	1	20
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Dec 2019	8	7	1	16
Jan 2020	4	5	1	10
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Mar 2020	7	11	1	19
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Jun 2020	15	11	2	28
Jul 2020	35	24	3	62
Aug 2020	13	21	7	41
Sep 2020	15	13	0	28
Oct 2020	17	14	1	32
Nov 2020	13	14	0	27
Dec 2020	19	7	3	29
Jan 2021	16	13	1	30
Feb 2021	15	12	2	29
Mar 2021	21	14	2	37
Apr 2021	14	13	1	28
May 2021	13	11	4	28
Jun 2021	8	6	1	15
Jul 2021	14	13	1	28
Aug 2021	8	30	3	41
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Feb 2022	13	9	2	24
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Dec 2022	10	10	3	23
Jan 2023	10	14	1	25
Feb 2023	16	9	3	28
Mar 2023	20	16	1	37
Apr 2023	12	18	1	31
May 2023	54	9	1	64
Jun 2023	70	7	0	77
Jul 2023	57	10	2	69
Aug 2023	51	13	4	68
Sep 2023	41	12	3	56
Oct 2023	51	14	1	66
Nov 2023	34	4	3	41
Dec 2023	53	7	2	62
Jan 2024	44	4	0	48
Feb 2024	37	16	2	55
Mar 2024	44	15	4	63
Apr 2024	43	7	4	54
May 2024	18	16	4	38
Jun 2024	20	11	4	35
Jul 2024	24	8	2	34
Aug 2024	52	16	1	69
Sep 2024	11	10	0	21
Oct 2024	15	8	1	24
Nov 2024	31	14	1	46
Dec 2024	17	11	1	29
Jan 2025	19	15	5	39
Feb 2025	47	12	3	62
Mar 2025	39	17	1	57
Apr 2025	16	13	0	29
May 2025	23	16	0	39
Jun 2025	43	26	0	69
Jul 2025	34	20	5	59
Aug 2025	37	31	3	71
Sep 2025	58	32	2	92
Oct 2025	31	27	2	60
Nov 2025	48	15	2	65

Latest update: 20 Nov 2025

Short summary

This work focuses on the balloon borne NOAA frost point hygrometer (FPH) instrument flown at three locations around the world: Boulder, Colorado, Lauder, New Zealand, and Hilo, Hawaii. The ongoing 36-year record is the longest continuous water vapor record with profiles reaching 28 km. Significant instrument updates in 2008 decreased the weight, cost, power consumption, and manufacturing time offering greater precision and ease of use.