Repository: Freie Universität Berlin, Math Department

The added value of large-eddy and storm-resolving models for simulating clouds and precipitation

Stevens, B. and Acquistapace, C. and Hansen, A. and Heinze, R. and Klinger, C. and Klocke, D. and Rybka, H. and Schubotz, W. and Windmiller, J. and Adamidis, P. and Arka, I. and Barlakas, V. and Biercamp, J. and Brueck, M. and Brune, S.A. and Buehler, U. and Burkhardt, U. and Cioni, G. and Costa-Suròs, M. and Crewell, S. and Crüger, T. and Deneke, H. and Friederichs, P. and Henken, C.C. and Hohenegger, C. and Jacob, M. and Jakub, F. and Kalthoff, N. and Köhler, M. and van Laar, T.W. and Li, P. and Löhnert, U. and Macke, A and Madenach, N. and Mayer, B. and Nam, C. and Naumann, A.K. and Peters, K. and Poll, S. and Quaas, J. and Röber, N. and Rochetin, N. and Scheck, L. and Schemann, V. and Schnitt, S. and Senf, F. and Shapkalijevski, M. and Simmer, C. and Singh, S. and Sourdeval, O. and Spickermann, D. and Strandgren, J. and Tessiot, O. and Vercauteren, N. and Vial, J. and Voigt, A. and Zängl, G. and Seifert, A. (2020) The added value of large-eddy and storm-resolving models for simulating clouds and precipitation. Journal of the Meteorological Society of Japan, 98 . pp. 395-435. ISSN Online: 2186-9057 Print: 0026-1165

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More than one hundred days were simulated over very large domains with fine (0.156 km to 2.5 km) grid spacing for realistic conditions to test the hypothesis that storm (kilometer) and large-eddy (hectometer) resolving simulations would provide an improved representation of clouds and precipitation in atmospheric simulations. At scales that resolve convective storms (storm-resolving for short), the vertical velocity variance becomes resolved and a better physical basis is achieved for representing clouds and precipitation. Similarly to past studies we found an improved representation of precipitation at kilometer scales, as compared to models with parameterized convection. The main precipitation features (location, diurnal cycle and spatial propagation) are well captured already at kilometer scales, and refining resolution to hectometer scales does not substantially change the simulations in these respects. It does, however, lead to a reduction in the precipitation on the time-scales considered – most notably over the ocean in the tropics. Changes in the distribution of precipitation, with less frequent extremes are also found in simulations incorporating hectometer scales. Hectometer scales appear to be more important for the representation of clouds, and make it possible to capture many important aspects of the cloud field, from the vertical distribution of cloud cover, to the distribution of cloud sizes, and to the diel (daily) cycle. Qualitative improvements, particularly in the ability to differentiate cumulus from stratiform clouds, are seen when one reduces the grid spacing from kilometer to hectometer scales. At the hectometer scale new challenges arise, but the similarity of observed and simulated scales, and the more direct connection between the circulation and the unconstrained degrees of freedom make these challenges less daunting. This quality, combined with already improved simulation as compared to more parameterized models, underpins our conviction that the use and further development of storm-resolving models offers exciting opportunities for advancing understanding of climate and climate change.

Item Type:Article
Additional Information:Special Edition on DYAMOND: The DYnamics of the Atmospheric general circulation Modeled On Non-hydrostatic Domains,
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:2390
Deposited By: Ulrike Eickers
Deposited On:27 Jan 2020 15:28
Last Modified:26 May 2020 03:43

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