Frost point hygrometers

Hurst, D. F.; Fujiwara, Masatomo; Oltmans, S. J.

doi:10.1016/b978-0-12-823953-7.00015-0

Cited by 2 publications

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead, Figure 3 shows a separate trend analysis of HALOE SWV for the Boulder sector, but for 1993 to 2002; its average SWV value is 4.62 ppmv and its trend is no longer negative but positive or +4.4±0.8(2σ) %/decade. All data points of the FPH record are assumed to be valid and accurate to 10%, based on the extensive studies reported in Hurst et al (2023). Yet, Fig.…”

Section: Time Series Analyses Of Haloe Swv Near Bouldermentioning

confidence: 99%

Technical Note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado

Remsberg

2023

Preprint

View full text Add to dashboard Cite

Abstract. This study compares time series of stratospheric water vapor (SWV) data at 30 hPa from 1993 to 2005, based on sets of Halogen Occultation Experiment (HALOE) profiles above the Boulder, CO (40° N, 255° E) region and on local frost-point hygrometer (FPH) measurements. Their differing trends herein agree with previously published findings. The FPH trends are presumed to be accurate within their uncertainties, and there are no known measurement biases affecting the HALOE trends. However, the seasonal sampling from HALOE is deficient at 40° N from 2001 to 2005, especially during late winter and springtime. HALOE time series at 20 hPa clearly show a springtime maximum in SWV at 40° N. The retrievals of HALOE SWV have significant corrections for interfering aerosol extinction following the eruption of Pinatubo, but there is no evidence that those corrections cause incorrect SWV trends after 1992. Accordingly, this study finds that the SWV trends from HALOE and FPH agree within their uncertainties for the more limited time span of 1993 to 2002. Northern hemisphere time series and daily plots of SWV from the Limb Infrared Monitor of the Stratosphere (LIMS) experiment indicate that there is transport of filaments of high SWV from polar to middle latitudes during dynamically active, winter and springtime periods. Although FPH measurements sense SWV variations at all scales, the HALOE time series do not resolve small-scale structure because its time series data are based on an average of four or more occultations within a finite latitude/longitude sector. It is concluded that the variations and trends of HALOE SWV are accurate for 1993 to 2002 at 40° N and in accord with the spatial scales of its measurements and its sampling frequency over time.

show abstract

Section: Time Series Analyses Of Haloe Swv Near Bouldermentioning

confidence: 99%

Technical Note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado

Remsberg

2023

Preprint

View full text Add to dashboard Cite

show abstract

Water Vapor in the Upper Troposphere above Syowa Station in the Antarctic: Its Variations and Causes

Tomikawa

Kohma

Takeda

et al. 2023

SOLA

View full text Add to dashboard Cite

An intensive balloon-borne observation was performed at Syowa Station in the Antarctic (69.0°S, 39.6°E) in July 2016 using Cryogenic Frostpoint Hygrometers (CFH) and Electrochemical Concentration Cell (ECC) ozonesondes. High water vapor concentration was observed in the upper troposphere in two out of five observations. Trajectory analysis and atmospheric reanalysis data showed that moist air was transported into the upper troposphere due to the upwelling in front of a trough. While only isentropic transport was dominant in one case, both the isentropic transport and diabatic heating Tomikawa et al., Water vapor in the upper troposphere above Syowa Station 2 contributed to the upward transport in the other case. In another case where the air parcels came over the Antarctic continent, the water vapor concentration in the upper troposphere was lower than in the other cases. These results suggest that transport of air parcels with different origins by synoptic-scale disturbances controls water vapor concentration in the Antarctic upper troposphere.

show abstract

Frost point hygrometers

Cited by 2 publications

References 40 publications

Technical Note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado

Technical Note: On HALOE stratospheric water vapor variations and trends at Boulder, Colorado

Water Vapor in the Upper Troposphere above Syowa Station in the Antarctic: Its Variations and Causes

Contact Info

Product

Resources

About