Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Conferences, Workshops, Symposiums, and Seminars
  4. The influence of drifting and blowing snow on surface (turbulent) mass- and energy exchange assessed with different methods
 
conference presentation

The influence of drifting and blowing snow on surface (turbulent) mass- and energy exchange assessed with different methods

Lehning, Michael
•
Gerber, Franziska
•
Brito Melo, Daniela  
Show more
December 16, 2021
AGU Fall Meeting

Drifting and blowing snow is a dominant process shaping snow-covered surfaces in particular in extreme environments such as high mountains or polar regions. Because the process is complicated to describe, as it covers scales from below 1 mm to several kilometers, it is typically not considered in models or greatly simplified. This impedes our ability to correctly describe the mass- and energy exchange above snow covered surfaces and therefore also to understand the relationship with precipitation patterns. Our contribution addresses this problem by reviewing the current state of understanding. We show based on measurements and large-eddy simulations (LES) that typical bulk Monin–Obukhov formulations for turbulent fluxes do not work in the presence of snow transport. More specifically, surface exchange is much more intense than predicted by current large-scale models during snow transport. We further present a new model coupling, CRYOWRF, which introduces the snow model SNOWPACK and a detailed representation of blowing snow to the Weather and Forecasting model (WRF) in order to allow a more accurate representation of surface exchange. We show how this coupled version is able to reproduce observed patterns of blowing snow and its influence on surface exchange. This includes cases of blowing snow over mountain ridges and large blowing snow clouds from katabatic winds, an hydraulic jump and waves in Antarctica (Figure). Overall, we find that the influence of drifting and blowing snow on surface exchange may have been underestimated in previous (model) assessments and that the highly dynamic exchange associated with drifting and blowing snow has not only implications for the surface mass and energy balance, but potentially also for the isotopic composition of deposited snow.

  • Details
  • Metrics
Type
conference presentation
Author(s)
Lehning, Michael
Gerber, Franziska
Brito Melo, Daniela  
Huwald, Hendrik
Sigmund, Armin  
Dujardin, Jérôme
Walter, Benjamin
Sharma, Varun
Date Issued

2021-12-16

URL

AGU web

https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/940165
Written at

EPFL

EPFL units
CRYOS  
Event nameEvent placeEvent date
AGU Fall Meeting

New Orleans, LA & Online

13-17 December 2021

Available on Infoscience
March 11, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/186218
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés