Diurnal Cycle in Atmospheric Water over Switzerland

Hocke, Klemens; Navas-Guzmán, Francisco; Moreira Méndez, Lorena; Bernet, Leonie Anna Luisa; Mätzler, Christian (2017). Diurnal Cycle in Atmospheric Water over Switzerland. Remote sensing, 9(12), p. 909. Molecular Diversity Preservation International MDPI 10.3390/rs9090909

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The TROpospheric WAter RAdiometer (TROWARA) is a ground-based microwave radiometer with an additional infrared channel observing atmospheric water parameters in Bern, Switzerland. TROWARA measures with nearly all-weather capability during day- and nighttime with a high temporal resolution (about 10 s). Using the almost complete data set from 2004 to 2016, we derive and discuss the diurnal cycles in cloud fraction (CF), integrated liquid water (ILW) and integrated water vapour (IWV) for different seasons and the annual mean. The amplitude of the mean diurnal cycle in IWV is 0.41 kg/m². The sub-daily minimum of IWV is at 10:00 LT while the maximum of IWV occurs at 19:00 LT. The relative amplitudes of the diurnal cycle in ILW are up to 25% in October, November and January, which is possibly related to a breaking up of the cloud layer at 10:00 LT. The minimum of ILW occurs at 12:00 LT, which is due to cloud solar absorption. In case of cloud fraction of liquid water clouds, maximal values of +10% are reached at 07:00 LT and then a decrease starts towards the minimum of -10%, which is reached at 16:00 LT in autumn. This breakup of cloud layers in the late morning and early afternoon hours seems to be typical for the weather in Bern in autumn. Finally, the diurnal cycle in rain fraction is analysed, which shows an increase of a few percent in the late afternoon hours during summer.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

Graduate School:

Graduate School of Climate Sciences

UniBE Contributor:

Hocke, Klemens; Moreira Méndez, Lorena; Bernet, Leonie Anna Luisa and Mätzler, Christian

Subjects:

600 Technology > 620 Engineering

ISSN:

2072-4292

Publisher:

Molecular Diversity Preservation International MDPI

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

26 Mar 2018 09:43

Last Modified:

04 Nov 2019 02:48

Publisher DOI:

10.3390/rs9090909

BORIS DOI:

10.7892/boris.113010

URI:

https://boris.unibe.ch/id/eprint/113010

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