Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch
Alan D. Griffiths,Franz Conen,Ernest Weingartner,Lukas Zimmermann,Scott D. Chambers,Alastair G. Williams,Martin Steinbacher +6 more
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In this article, the authors quantify the land-surface influence at Jungfraujoch hour by hour and detect the presence of anabatic winds on a daily basis during 2010-2011, but only from April to September.Abstract:
. Atmospheric composition measurements at Jungfraujoch are affected intermittently by boundary-layer air which is brought to the station by processes including thermally driven (anabatic) mountain winds. Using observations of radon-222, and a new objective analysis method, we quantify the land-surface influence at Jungfraujoch hour by hour and detect the presence of anabatic winds on a daily basis. During 2010–2011, anabatic winds occurred on 40% of days, but only from April to September. Anabatic wind days were associated with warmer air temperatures over a large fraction of Europe and with a shift in air-mass properties, even when comparing days with a similar mean radon concentration. Excluding days with anabatic winds, however, did not lead to a better definition of the unperturbed aerosol background than a definition based on radon alone. This implies that a radon threshold reliably excludes local influences from both anabatic and non-anabatic vertical-transport processes.read more
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Increasing the accuracy and temporal resolution of two-filter radon–222 measurements by correcting for the instrument response
TL;DR: In this paper, a Bayesian approach using a Markov chain Monte Carlo sampler is used to correct the detector's slow-time response for near-surface atmospheric radon measurements.
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Simulating CH 4 and CO 2 over South and East Asia using the zoomed chemistry transport model LMDz-INCA
Xin Lin,Philippe Ciais,Philippe Bousquet,Michel Ramonet,Yi Yin,Yi Yin,Yves Balkanski,Anne Cozic,Marc Delmotte,Nikolaos Evangeliou,Nuggehalli K. Indira,Robin Locatelli,Robin Locatelli,Shushi Peng,Shilong Piao,Marielle Saunois,Panangady S. Swathi,Rong Wang,Rong Wang,Camille Yver-Kwok,Yogesh K. Tiwari,Lingxi Zhou +21 more
TL;DR: In this paper, the authors used zoomed versions of the global chemistry transport model (LMDz-INCA) to simulate CH4 and CO2 in South and East Asia (SEA) regions.
Journal ArticleDOI
Impact of Air Mass Conditions and Aerosol Properties on Ice Nucleating Particle Concentrations at the High Altitude Research Station Jungfraujoch
Larissa Lacher,Martin Steinbacher,Nicolas Bukowiecki,Erik Herrmann,Assaf Zipori,Zamin A. Kanji +5 more
TL;DR: In this article, the authors investigated potential predictor parameters of meteorological conditions and aerosol properties for ice nucleating particles (INP) concentrations at mixed-phase cloud condition at 242 K.
Journal ArticleDOI
Predicting abundance and variability of ice nucleating particles inprecipitation at the high-altitude observatory Jungfraujoch
Emiliano Stopelli,Franz Conen,Cindy E. Morris,Erik Herrmann,Stephan Henne,Martin Steinbacher,Christine Alewell +6 more
TL;DR: In this paper, several environmental parameters were scanned for their capability to predict the observed abundance and variability of ice nucleating particles (INPs−8), and the best correlations with observed number of INPs were implemented as potential predictor variables in statistical multiple linear regression models.
Journal ArticleDOI
Using freezing spectra characteristics to identify ice-nucleating particle populations during the winter in the Alps
Jessie M. Creamean,Jessie M. Creamean,Claudia Mignani,Nicolas Bukowiecki,Nicolas Bukowiecki,Franz Conen +5 more
TL;DR: In this article, a comparison of INP spectral characteristics in air, cloud rime, and fresh fallen snow at the High Altitude Research Station, Jungfraujoch is presented.
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