Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder

Ulrike Egerer

Ulrike will work with John Cassano and Matt Shupe on analyzing turbulent energy fluxes in the Arctic cloudy atmospheric boundary layer (ABL). Turbulent fluxes constitute a major part of the atmospheric energy budget and influence the surface heat balance by distributing energy vertically in the atmosphere. However, only few in-situ measurements exist of the vertical profile of turbulent fluxes in the Arctic ABL, especially under cloudy conditions. The project is based on measurements with an uncrewed aerial vehicle (UAV) during the field campaign MOSAiC in the central Arctic ocean during the sea-ice melt season 2020. First, a suitable method will be elaborated to derive turbulent fluxes from the UAV turbulence measurements. Second, the resulting vertical profiles of turbulent fluxes will be analyzed concerning different ABL and sea-ice conditions, including the influence of atmospheric stability, stratification, clouds, leads, and melt ponds. This study will help to advance our understanding of how the turbulent fluxes influence the surface energy budget and interact with the melting sea ice.


View Publications

  • Egerer U; Ehrlich A; Gottschalk M; Griesche H; Neggers RAJ; Siebert H; Wendisch M. (Apr 2021). Case study of a humidity layer above Arctic stratocumulus and potential turbulent coupling with the cloud top. Atmospheric Chemistry and Physics , 21(8), 6347-6364. 10.5194/acp-21-6347-2021
  • Siebert H; Szodry K-E; Egerer U; Wehner B; Henning S; Chevalier K; Lckerath J; Welz O; Weinhold K; Lauermann F. (Jan 2021). Observations of Aerosol, Cloud, Turbulence, and Radiation Properties at the Top of the Marine Boundary Layer over the Eastern North Atlantic Ocean: The ACORES Campaign. Bulletin of the American Meteorological Society , 102(1), E123-E147. 10.1175/bams-d-19-0191.1
  • Egerer U; Gottschalk M; Siebert H; Ehrlich A; Wendisch M. (Jul 2019). The new BELUGA setup for collocated turbulence and radiation measurements using a tethered balloon: first applications in the cloudy Arctic boundary layer. Atmospheric Measurement Techniques , 12(7), 4019-4038. 10.5194/amt-12-4019-2019
  • Neggers RAJ; Chylik J; Egerer U; Griesche H; Schemann V; Seifert P; Siebert H; Macke A. (Jul 2019). Local and Remote Controls on Arctic Mixed?Layer Evolution. Journal of Advances in Modeling Earth Systems , 11(7), 2214-2237. 10.1029/2019ms001671
  • Wendisch, M; Macke, A; Ehrlich, A; Lupkes, C; Mech, M; Chechin, D; Dethloff, K; Velasco, CB; Bozem, H; Bruckner, M; Clemen, HC; Crewell, S; Donth, T; Dupuy, R; Ebell, K; Egerer, U; Engelmann, R; Engler, C; Eppers, O; Gehrmann, M; Gong, XD; Gottschalk, M; Gourbeyre, C; Griesche, H; Hartmann, J; Hartmann, M; Heinold, B; Herber, A; Herrmann, H; Heygster, G; Hoor, P; Jafariserajehlou, S; Jakel, E; Jarvinen, E; Jourdan, O; Kastner, U; Kecorius, S; Knudsen, EM; Kollner, F; Kretzschmar, J; Lelli, L; Leroy, D; Maturilli, M; Mei, L; Mertes, S; Mioche, G; Neuber, R; Nicolaus, M; Nomokonova, T; Notholt, J; Palm, M; van Pinxteren, M; Quaas, J; Richter, P; Ruiz-Donoso, E; Schafer, M; Schmieder, K; Schnaiter, M; Schneider, J; Schwarzenbock, A; Seifert, P; Shupe, MD; Siebert, H; Spreen, G; Stapf, J; Stratmann, F; Vogl, T; Welti, A; Wex, H; Wiedensohler, A; Zanatta, M; Zeppenfeld, S. (May 2019). The Arctic Cloud Puzzle: Using ACLOUD/PASCAL Multiplatform Observations to Unravel the Role of Clouds and Aerosol Particles in Arctic Amplification. BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY , 100(5). 10.1175/BAMS-D-18-0072.1