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Larcform 1 - single column model intercomparison of Arctic air formation, link to model results in NetCDF format
Pithan, Felix ; Ackerman, Andrew ; Angevine, Wayne M. ; Hartung, Kerstin ; Ickes, Luisa ; Kelley, Maxwell ; Medeiros, Brian ; Sandu, Irina ; Steeneveld, G.J. - \ 2016
Weather and climate models struggle to represent lower tropospheric temperature and moisture profiles and surface fluxes in Arctic winter, not least because they lack or misrepresent physical processes that are specific to high latitudes. The Arctic boundary layer in winter has been observed to be in either a radiatively clear or cloudy state: The radiatively clear state is characterized by strong surface radiative cooling leading to the build-up of surface-based temperature inversions, whereas the cloudy state occurs when cloud liquid water is present in the atmospheric column, allowing little or no surface radiative cooling and leading to weaker and typically elevated temperature inversions. Many large-scale models have been shown to lack the cloudy state, and some do substantially underestimate stability in the clear state. We here present results from the first Lagrangian ARCtic air FORMation experiment (Larcform 1), a GASS (Global atmospheric system studies) single-column model intercomparison which reproduces these biases of large-scale models in an idealised setup.
Select strengths and biases of models in representing the Arctic winter boundary layer over sea ice : the Larcform 1 single column model intercomparison
Pithan, Felix ; Ackerman, Andrew ; Angevine, Wayne M. ; Hartung, Kerstin ; Ickes, Luisa ; Kelley, Maxwell ; Medeiros, Brian ; Sandu, Irina ; Steeneveld, Gert Jan ; Sterk, H.A.M. - \ 2016
Journal of Advances in Modeling Earth Systems 8 (2016)3. - ISSN 1942-2466 - p. 1345 - 1357.
Arctic - boundary-layer - intercomparison - inversion - mixed-phase clouds - models

Weather and climate models struggle to represent lower tropospheric temperature and moisture profiles and surface fluxes in Arctic winter, partly because they lack or misrepresent physical processes that are specific to high latitudes. Observations have revealed two preferred states of the Arctic winter boundary layer. In the cloudy state, cloud liquid water limits surface radiative cooling, and temperature inversions are weak and elevated. In the radiatively clear state, strong surface radiative cooling leads to the build-up of surface-based temperature inversions. Many large-scale models lack the cloudy state, and some substantially underestimate inversion strength in the clear state. Here, the transformation from a moist to a cold dry air mass is modeled using an idealized Lagrangian perspective. The trajectory includes both boundary layer states, and the single-column experiment is the first Lagrangian Arctic air formation experiment (Larcform 1) organized within GEWEX GASS (Global atmospheric system studies). The intercomparison reproduces the typical biases of large-scale models: some models lack the cloudy state of the boundary layer due to the representation of mixed-phase microphysics or to the interaction between micro- and macrophysics. In some models, high emissivities of ice clouds or the lack of an insulating snow layer prevent the build-up of surface-based inversions in the radiatively clear state. Models substantially disagree on the amount of cloud liquid water in the cloudy state and on turbulent heat fluxes under clear skies. Observations of air mass transformations including both boundary layer states would allow for a tighter constraint of model behavior.

Trans-generational Transmission Of Glossina Hytrosavirus Depends On The Presence Of A Functional Symbiome
Boucias, D.G. ; Kariithi, H.M. ; Bourtzis, K. ; Schneider, M.K. ; Kelley, K. ; Miller, W.J. ; Parker, A.G. ; Abd-Alla, A.M.M. - \ 2013
Modeling of limiting conditions in passive landfarms for dredged sediments
Rulkens, W.H. ; Harmsen, J. ; Rijtema, P.E. ; Sims, R.C. - \ 2005
In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 1574771523 - p. P02 - P02.
Risk assessment for contaminated sediments treated on a landfarm
Harmsen, J. ; Rulkens, W.H. ; Eijsackers, H.J.P. ; Sims, R.C. - \ 2005
In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 1574771523 - p. F29 - F29.
Sustainable reuse of bioremediated PAH- and mineral oil-contaminated soils and sediments
Sims, R.C. ; Sims, J.L. ; Harmsen, J. - \ 2005
In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 1574771523 - p. F18 - F18.
Biodegradation rate of PAHs and mineral oil in sediments on a landfarm
Harmsen, J. ; Rulkens, W.H. ; Zweers, A.J. ; Toorn, A. van den; Sims, R.C. - \ 2005
In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 1574771523 - p. F17 - F17.
From the concept of bioavailability to the application of standardised methods for management of bioremediation
Harmsen, J. ; Rulkens, W.H. ; Eijsackers, H.J.P. ; Sims, R.C. - \ 2005
In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 1574771523 - p. F12 - F12.
Resonance raman studies of phenylcyclopropane radical cations
Godbout, J.T. ; Zuilhof, H. ; Heim, G. ; Gould, I.R. ; Goodman, J.L. ; Dinnocenzo, J.P. ; Myers Kelley, A. - \ 2000
Journal of Raman spectroscopy 31 (2000). - ISSN 0377-0486 - p. 233 - 241.
Resonance Raman spectra of the radical cations of phenylcyclopropane and trans-1-phenyl-2-methylcyclopropane are reported. A near-UV pump pulse excites a photosensitizer which oxidizes the species of interest, and a visible probe pulse delayed by 35 ns obtains the spectrum of the radical ion. The transient Raman spectra of the phenylcyclopropane radical cations show nine or ten enhanced modes for which assignments are suggested based on density functional theory (DFT) results, previously published calculations on the resonant excited state and comparison between the unsubstituted and methyl-substituted compounds. The transient spectra are consistent with the large effect of methyl substitution on the geometry of the radical cation predicted by DFT. The resonance Raman spectrum of the electron donor-acceptor complex between phenylcyclopropane and tetracyanoethylene is also obtained on resonance with the visible charge-transfer absorption band, but the spectra are very weak and only a few resonance enhanced lines are observed. These results are compared with previously published data on the p-methoxybenzyltrimethylsilane charge-transfer complex and radical cation.
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