Intercomparison of upper tropospheric and lower stratospheric water vapor measurements over the Asian Summer Monsoon during the StratoClim campaign
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Published:2022-08-23
Issue:16
Volume:15
Page:4767-4783
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Singer Clare E.ORCID, Clouser Benjamin W., Khaykin Sergey M.ORCID, Krämer MartinaORCID, Cairo Francesco, Peter Thomas, Lykov Alexey, Rolf ChristianORCID, Spelten Nicole, Afchine ArminORCID, Brunamonti Simone, Moyer Elisabeth J.
Abstract
Abstract. In situ measurements in the climatically important upper troposphere–lower stratosphere (UTLS) are critical for understanding controls on cloud formation, the entry of water into the stratosphere, and hydration–dehydration of the tropical tropopause layer.
Accurate in situ measurement of water vapor in the UTLS however is difficult because of low water vapor concentrations (<5 ppmv) and a challenging low temperature–pressure environment.
The StratoClim campaign out of Kathmandu, Nepal, in July and August 2017, which made the first high-altitude aircraft measurements in the Asian Summer Monsoon (ASM), also provided an opportunity to intercompare three in situ hygrometers mounted on the M-55 Geophysica: ChiWIS (Chicago Water Isotope Spectrometer), FISH (Fast In situ Stratospheric Hygrometer), and FLASH (Fluorescent Lyman-α Stratospheric Hygrometer).
Instrument agreement was very good, suggesting no intrinsic technique-dependent biases: ChiWIS measures by mid-infrared laser absorption spectroscopy and FISH and FLASH by Lyman-α induced fluorescence.
In clear-sky UTLS conditions (H2O<10 ppmv), mean and standard deviations of differences in paired observations between ChiWIS and FLASH were only (-1.4±5.9) % and those between FISH and FLASH only (-1.5±8.0) %.
Agreement between ChiWIS and FLASH for in-cloud conditions is even tighter, at (+0.7±7.6) %.
Estimated realized instrumental precision in UTLS conditions was 0.05, 0.2, and 0.1 ppmv for ChiWIS, FLASH, and FISH, respectively.
This level of accuracy and precision allows the confident detection of fine-scale spatial structures in UTLS water vapor required for understanding the role of convection and the ASM in the stratospheric water vapor budget.
Funder
Seventh Framework Programme University of Chicago
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference57 articles.
1. Bian, J., Pan, L. L., Paulik, L., Vömel, H., Chen, H., and Lu, D.: In situ
water vapor and ozone measurements in Lhasa and Kunming during the Asian
summer monsoon, Geophys. Res. Lett., 39, L19808, https://doi.org/10.1029/2012GL052996,
2012. a 2. Brunamonti, S., Jorge, T., Oelsner, P., Hanumanthu, S., Singh, B. B., Kumar, K. R., Sonbawne, S., Meier, S., Singh, D., Wienhold, F. G., Luo, B. P., Boettcher, M., Poltera, Y., Jauhiainen, H., Kayastha, R., Karmacharya, J., Dirksen, R., Naja, M., Rex, M., Fadnavis, S., and Peter, T.: Balloon-borne measurements of temperature, water vapor, ozone and aerosol backscatter on the southern slopes of the Himalayas during StratoClim 2016–2017, Atmos. Chem. Phys., 18, 15937–15957, https://doi.org/10.5194/acp-18-15937-2018, 2018. a, b 3. Brunamonti, S., Füzér, L., Jorge, T., Poltera, Y., Oelsner, P.,
Meier, S., Dirksen, R., Naja, M., Fadnavis, S., Karmacharya, J., Wienhold,
F. G., Luo, B. P., Wernli, H., and Peter, T.: Water Vapor in the Asian Summer
Monsoon Anticyclone: Comparison of Balloon‐Borne Measurements and ECMWF
Data, J. Geophys. Res.-Atmos., 124, 7053–7068,
https://doi.org/10.1029/2018JD030000, 2019. a, b 4. Cairo, F., Di Donfrancesco, G., Snels, M., Fierli, F., Viterbini, M., Borrmann, S., and Frey, W.: A comparison of light backscattering and particle size distribution measurements in tropical cirrus clouds, Atmos. Meas. Tech., 4, 557–570, https://doi.org/10.5194/amt-4-557-2011, 2011. a 5. Clouser, B. W., Sarkozy, L., Singer, C. E., KleinStern, C., Gaeta, D., Khaykin,
S., and Moyer, E. J.: The Airborn Chicago Water Isotope Spectrometer
(ChiWIS): An Integrated Cavity Output Spectrometer for Measurements of the
HDO/H2O Isotopic Ratio, in preparation for Atmos. Meas. Tech., 2022. a, b
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