A scaling relation for warm‐phase orographic precipitation: a Lagrangian analysis for 2D mountains

Miltenberger, Annette K.; Seifert, Axel; Joos, Hanna; Wernli, Heini

doi:10.1002/qj.2514

Cited by 16 publications

(16 citation statements)

References 69 publications

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“…Otherwise, the change in isotopic content due to temperature exceeds that due to CDNC by a factor of approximately 10 for the ranges of temperature and CDNC explored here. The weaker sensitivity of precipitation to CDNC changes with increasing precipitation is reminiscent of the work of Muhlbauer et al [] for mixed‐phase clouds and Miltenberger et al [] for warm clouds. The possibility remains that a model setup that yields weaker precipitation might show a stronger sensitivity of precipitation to CDNC changes, as in Miltenberger et al [].…”

Section: Model Resultsmentioning

confidence: 99%

“…The weaker sensitivity of precipitation to CDNC changes with increasing precipitation is reminiscent of the work of Muhlbauer et al [] for mixed‐phase clouds and Miltenberger et al [] for warm clouds. The possibility remains that a model setup that yields weaker precipitation might show a stronger sensitivity of precipitation to CDNC changes, as in Miltenberger et al []. However, the change in

δ^{18} {normalO}_{normalprecip}

due to CDNC is unlikely to increase far beyond the range seen in the reference case (W800m).…”

Section: Model Resultsmentioning

confidence: 99%

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Microphysical controls on the isotopic composition of wintertime orographic precipitation

et al. 2016

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The sensitivity of mixed-phase orographic clouds, precipitation, and their isotopic content to changes in dynamics, thermodynamics, and microphysics is explored in idealized two-dimensional flow over a mountain barrier. 18 O precip with increasing mountain height is not just a function of decreasing temperature but also reflects the changing contributions and distinct isotopic signatures of riming of cloud liquid and vapor deposition onto snow, the leading sources of precipitation in these simulations. The changes in 18 O precip with mountain height, temperature, and CDNC are governed in part by the microphysical pathways through which precipitating hydrometeors are formed and grow.

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Section: Model Resultsmentioning

confidence: 99%

δ^{18} {normalO}_{normalprecip}

due to CDNC is unlikely to increase far beyond the range seen in the reference case (W800m).…”

Section: Model Resultsmentioning

confidence: 99%

Microphysical controls on the isotopic composition of wintertime orographic precipitation

et al. 2016

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“…For instance, Miltenberger et al (2013) implemented online trajectories in the COSMO model, hence allowing the trajectories to take full advantage of a 20 s time step. They applied the new method particularly to problems in orographic precipitation (Miltenberger et al, 2015), but an illustrative case of a north foehn study clearly showed the potential of the new method for foehn-related studies (Miltenberger, 2014). In a systematic study, Bowman et al (2013) looked at the minimal time resolution of the input winds required in Lagrangian models.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the latent heating contribution to foehn warming: Lagrangian analysis of two foehn events over the Swiss Alps

Miltenberger

Reynolds

Sprenger

2016

Quart J Royal Meteoro Soc

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Foehn flows are typically associated with warm air temperatures. Though several theories for the so‐called foehn air warming have been developed over the past century, no conclusion about the most important mechanism has been reached. The development of new methods to calculate accurate air‐mass trajectories over complex topography has opened up a new perspective on this question. Air‐mass‐trajectories derived from wind‐field data from COSMO model simulations with 20 s temporal resolution are used in this study to investigate the origin of the foehn air and the contribution of adiabatic and diabatic processes for two foehn events in the Swiss Alps, with a focus on the Rhine valley. The first foehn event investigated has no precipitation on the upstream side of the Alps. The majority of air parcels stem from upstream altitudes above 1.8 km and most of the foehn air warming is due to adiabatic descent (∼79%). In the second event investigated, significant upstream precipitation occurred. For this case, a significantly larger fraction of the foehn air parcels originate within the lowest 2 km of the upstream atmosphere (up to 70%). Adiabatic descent accounts for the largest part of the temperature change (∼70%), while moist diabatic processes explain about 60% of the potential temperature change. The vertical displacement across the Alpine range is correlated with the diabatic temperature change: parcels strongly heated by condensation, deposition and freezing are in general found at high altitudes above the foehn valley, while parcels affected by diabatic cooling through evaporation, sublimation and melting arrive closer to the valley floor. The high‐resolution trajectories also indicate a much more complicated vertical and horizontal flow pattern than generally assumed, with several distinct air streams upstream of the mountain range and vertical ‘scrambling’ of air masses.

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“…A conceptual model of the sedimentation fluxes provides insight into the key variables controlling the modification of the moisture profile and may be used to represent these in models with a lower spatial resolution. Similar to previously proposed conceptional models for orographic precipitation Smith (1979); Smith and Barstad (2004); Seifert and Zängl (2010); Miltenberger et al (2015), we chose an ansatz based on the consideration of the characteristic timescales of the cloud:…”

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confidence: 99%

Vertical redistribution of moisture and aerosol in orographic mixed-phase clouds

Miltenberger¹,

Field²,

Hill³

2020

Preprint

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Abstract. Orographic wave clouds offer a natural laboratory to investigate cloud microphysical processes and their representation in atmospheric models. Wave clouds impact the larger-scale flow by the vertical redistribution of moisture and aerosol. Here we use detailed cloud microphysical observations from the ICE-L campaign to evaluate the recently developed Cloud Aerosol Interacting Microphysics (CASIM) module in the Met Office Unified Model (UM) with a particular focus on different parameterisations for heterogeneous freezing. Modelled and observed thermodynamic and microphysical properties agree very well (deviation of air temperature

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A scaling relation for warm‐phase orographic precipitation: a Lagrangian analysis for 2D mountains

Cited by 16 publications

References 69 publications

Microphysical controls on the isotopic composition of wintertime orographic precipitation

Microphysical controls on the isotopic composition of wintertime orographic precipitation

Revisiting the latent heating contribution to foehn warming: Lagrangian analysis of two foehn events over the Swiss Alps

Vertical redistribution of moisture and aerosol in orographic mixed-phase clouds

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