Profiling the Arctic Stable Boundary Layer in Advent Valley, Svalbard: Measurements and Simulations
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The unmanned aerial system SUMO (Small Unmanned Meteorological Observer) has been used for the observation of the structure and behaviour of the atmospheric boundary layer above the Advent Valley, Svalbard during a two-week period in early spring 2009. Temperature, humidity and wind profiles measured by the SUMO system have been compared with measurements of a small tethered balloon system that was operated simultaneously. It is shown that both systems complement each other. Above 200 m, the SUMO system outperforms the tethered balloon in terms of flexibility and the ability to penetrate strong inversion layers of the Arctic boundary layer. Below that level, the tethered balloon system provides atmospheric profiles with higher accuracy, mainly due to its ability to operate at very low vertical velocities. For the observational period, a numerical mesoscale model has been run at high resolution and evaluated with SUMO profiles reaching up to a height of 1500 m above the ground. The sensitivity to the choice of atmospheric boundary-layer schemes and horizontal resolution has been investigated. A new scheme especially suited for stable conditions slightly improves the temperature forecast in stable conditions, although all schemes show a warm bias close to the surface and a cold bias above the atmospheric boundary layer. During one cold and cloudless night, the SUMO system could be operated nearly continuously (every 30–45 minutes). This allowed for a detailed case study addressing the structure and behaviour of the air column within and above Advent Valley and its interaction with the local topography. The SUMO measurements in conjunction with a 10-m meteorological mast enabled the identification of a very stable nocturnal surface layer adjacent to the valley bottom, a stable air column in the valley and a strong inversion layer above the summit height. The results indicate the presence of inertial-gravity waves during the night, a feature not captured by the model.
KeywordsAtmospheric profiles Boundary-layer schemes High-resolution numerical model Inertial-gravity oscillation Small Unmanned Meteorological Observer (SUMO) measurements Stable Arctic atmospheric boundary layer
The field work was financed by the Arctic Field Grant 2009 (Svalbard Science Forum RIS ID 3346). Travel expenses for the co-authors M. O. Jonassen and J. Reuder have been covered by Meltzerfondet and an IPY-Thorpex Norwegian Research Council grant number 175992/S30. Special thanks to Avinor at Longyearbyen airport for a cooperative working environment, and to meteorologikonsulent Torgeir Mørk (met.no) for kindly providing meteorological data from Longyear airport. The authors are grateful to UNIS for the accessibility of the old Auroral Station in Adventdalen. Thanks to Andøya Rocket Range for the permission to use their facilities at Longyear airport. Many thanks to Tor de Lange (GFI) for his great commitment in installing the weather mast in AV in extreme weather conditions. The tethered balloon data were kindly provided by Tiina Kilpeläinen and Miina Manninen. The authors wish to acknowledge the work and commitment of the pilots Martin Müller and Christian Lindenberg. We thank Thomas Spengler for the valuable discussions on boundary-layer dynamics of the case study. Supercomputing resources, on a Cray XT4 computer at Parallab at the University of Bergen, have been made available by the Norwegian Research Council. Finally, the authors are grateful to the three anonymous reviewers who distinctly improved the manuscript by constructive criticism. This is publication no. A 389 from the Bjerknes Centre for Climate Research.
This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
- Brisset P, Drouin A, Gorraz M, Huard P, Tyler J (2006) The Paparazzi solution. MAV2006, Sandestin, FloridaGoogle Scholar
- Chou M, Suarez M (1999) A solar radiation parameterization for atmospheric studies. NASA Tech Memo 104606: 40Google Scholar
- Galperin B, Sukoriansky S, Perov V (2007) Implementation of the Quasi-Normal Scale Elimination (QNSE) turbulence model in WRF. 8th WRF Users’ Workshop, Boulder CO, June 2007Google Scholar
- Holton JR (1992) An introduction to dynamic meteorology, 3rd edn. Academic Press Inc., New York, 511 ppGoogle Scholar
- Hong S, Kim S (2007) Stable boundary layer mixing in a vertical diffusion scheme. The Korea Meteor Soc, Fall conference, Seoul, Korea, Oct 25–26Google Scholar
- Janjic Z (1996) The surface layer in the NCEP Eta model. 11th Conference on Numerical Weather Prediction, Am Meteorol Soc pp 354–355Google Scholar
- Janjic Z (2002) Nonsingular implementation of the Mellor-Yamada Level 2.5 Scheme in the NCEP meso models. NCEP Office Note No. 437:61ppGoogle Scholar
- Jonassen M (2008) The Small Unmanned Meteorological Observer (SUMO)—characterization and test of a new measurement system for atmospheric boundary layer research. Master’s thesis, Geophysical Institute, University of BergenGoogle Scholar
- Manninen M (2009) Structure of the atmospheric boundary layer in Isfjorden, Svalbard, in late winter 2009. Master’s thesis, University Center in SvalbardGoogle Scholar
- Mayer S, Sandvik A, Jonassen M, Reuder J (2010) Atmospheric profiling with the UAS SUMO: a new perspective for the evaluation of fine-scale atmospheric models. Meteorol Atmos Phys. doi: 10.1007/s00703-010-0063-2
- Mckinnon K (1996) Convergence of the Nelder-Mead simplex method to a non-stationary point. Tech rep, SIAM J OptimGoogle Scholar
- Petersson C (2007) An analysis of the local weather around Longyearbyen and an instrumental comparison. Master’s thesis, University Center in SvalbardGoogle Scholar
- Reuder J, Ablinger M, Ágústsson H, Brisset P, Brynjólfsson S, Garhammer M, Johannesson T, Jonassen M, Kühnel R, Lämmlein S, de Lange T, Lindenberg C, Malardel S, Mayer S, Müller M, Ólafsson H, Rögnvaldsson O, Schäper W, Spengler T, Zängl G, Egger J (2011) FLOHOF 2007: An overview of the mesoscale meteorological field campaign at Hofsjökull, Central Iceland. Meteorol Atmos Phys. doi: 10.1007/s00703-010-0118-4
- Seibert P, Beyrich F, Gryning SE, Joffre S, Rasmussen A, Tercier P (2002) Review and intercomparison of operational methods for the determination of the mixing height. Dev Environ Sci 1: 569–613Google Scholar
- Skamarock W, Klemp J, Dudhia J, Gill D, Barker D, Duda M, Huang XY, Wang W (2008) A Description of the Advanced Research WRF Version 3. NCAR/TN:475+STRGoogle Scholar
- Stull RB (1988) An introduction to boundary layer meteorology. Kluwer Academic Publishers, Boston, 666 ppGoogle Scholar
- Sukoriansky S, Galperin B (2008) Anisotropic turbulence and internal waves in stably stratified flows (QNSE theory). Physica Scripta 132: 14–36Google Scholar
- Tjernström M, Zagar M, Svensson G (2004) Model simulations of the Arctic atmospheric boundary layer from the SHEBA year. AMBIO J Human Environ 33(4): 221–227Google Scholar