The Atmospheric Boundary Layer Over Baltic Sea Ice

2005 ◽  
Vol 117 (1) ◽  
pp. 91-109 ◽  
Author(s):  
Burghard Brümmer ◽  
Amèlie Kirchgäßner ◽  
Gerd Müller
Keyword(s):  
Boundary Layer ◽  
Sea Ice ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea

Evaluation of regional NWP results for sea ice covered Bothnia Bay (Baltic Sea) in winter 2020.

2021 ◽  
Author(s):  
Marta Wenta ◽  
Agnieszka Herman
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Sea Ice ◽  
Surface Temperature ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea ◽  
Polar Regions ◽  
Near Surface ◽  
Accurate Representation ◽  
Complex Processes

<p>The ongoing development of NWP (Numerical Weather Prediction) models and their increasing horizontal resolution have significantly improved forecasting capabilities. However, in the polar regions models struggle with the representation of near-surface atmospheric properties and the vertical structure of the atmospheric boundary layer (ABL) over sea ice. Particularly difficult to resolve are near-surface temperature, wind speed, and humidity, along with diurnal changes of those properties. Many of the complex processes happening at the interface of sea ice and atmosphere, i.e. vertical fluxes, turbulence, atmosphere - surface coupling are poorly parameterized or not represented in the models at all. Limited data coverage and our poor understanding of the complex processes taking place in the polar ABL limit the development of suitable parametrizations. We try to contribute to the ongoing effort to improve the forecast skill in polar regions through the analysis of unmanned aerial vehicles (UAVs) and automatic weather station (AWS) atmospheric measurements from the coastal area of Bothnia Bay (Wenta et. al., 2021), and the application of those datasets for the analysis of regional NWP models' forecasts. </p><p>Data collected during HAOS (Hailuoto Atmospheric Observations over Sea ice) campaign (Wenta et. al., 2021) is used for the evaluation of regional NWP models results from AROME (Applications of Research to Operations at Mesoscale) - Arctic, HIRLAM (High Resolution Limited Area Model) and WRF (Weather Research and Forecasting). The presented analysis focuses on 27 Feb. 2020 - 2 Mar. 2020, the time of the HAOS campaign, shortly after the formation of new, thin sea ice off the westernmost point of Hailuoto island.  Throughout the studied period weather conditions changed from very cold (-14℃), dry and cloud-free to warmer (~ -5℃), more humid and opaquely cloudy. We evaluate models’ ability to correctly resolve near-surface temperature, humidity, and wind speed, along with vertical changes of temperature and humidity over the sea ice. It is found that generally, models struggle with an accurate representation of surface-based temperature inversions, vertical variations of humidity, and temporal wind speed changes. Furthermore, a WRF Single Columng Model (SCM) is launched to study whether specific WRF planetary boundary layer parameterizations (MYJ, YSU, MYNN, QNSE), vertical resolution, and more accurate representation of surface conditions increase the WRF model’s ability to resolve the ABL above sea ice in the Bay of Bothnia. Experiments with WRF SCM are also used to determine the possible reasons behind model’s biases. Preliminary results show that accurate representation of sea ice conditions, including thickness, surface temperature, albedo, and snow coverage is crucial for increasing the quality of NWP models forecasts. We emphasize the importance of further development of parametrizations focusing on the processes at the sea ice-atmosphere interface.</p><p> </p><p>Reference:</p><p>Wenta, M., Brus, D., Doulgeris, K., Vakkari, V., and Herman, A.: Winter atmospheric boundary layer observations over sea ice in the coastal zone of the Bay of Bothnia (Baltic Sea), Earth Syst. Sci. Data, 13, 33–42, https://doi.org/10.5194/essd-13-33-2021, 2021. </p><p><br><br><br><br><br><br></p>

scholarly journals Winter atmospheric boundary layer observations and numerical modelling over sea ice in the coastal zone of the Bothnian Bay (Baltic Sea).

2020 ◽  
Author(s):  
Marta Wenta ◽  
Agnieszka Herman ◽  
David Brus ◽  
Konstantinos Doulgeris
Keyword(s):  
Boundary Layer ◽  
Numerical Modelling ◽  
Sea Ice ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea ◽  
Coastal Zone ◽  
Bothnian Bay

scholarly journals Lidar observation of aerosol transformation in the atmospheric boundary layer above the Baltic Sea

Oceanologia ◽  
2021 ◽  
Vol 63 (2) ◽  
pp. 238-246
Author(s):  
Przemysław Makuch ◽  
Stefan Sitarek ◽  
Piotr Markuszewski ◽  
Tomasz Petelski ◽  
Tadeusz Stacewicz
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
Lidar Observation ◽  
The Baltic

Observations and Modelling of the Atmospheric Boundary Layer Over Sea-Ice in a Svalbard Fjord

2011 ◽  
Vol 140 (1) ◽  
pp. 105-123 ◽  
Author(s):  
Eeva Mäkiranta ◽  
Timo Vihma ◽  
Anna Sjöblom ◽  
Esa-Matti Tastula
Keyword(s):  
Boundary Layer ◽  
Sea Ice ◽  
Atmospheric Boundary Layer

scholarly journals Modelling the impact of Baltic Sea upwelling on the atmospheric boundary layer

2014 ◽  
Vol 66 (1) ◽  
pp. 24041 ◽  
Author(s):  
David Sproson ◽  
Erik Sahlée
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea ◽  
The Impact

scholarly journals Area-Averaged Surface Moisture Flux over Fragmented Sea Ice: Floe Size Distribution Effects and the Associated Convection Structure within the Atmospheric Boundary Layer

Atmosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 654
Author(s):  
Marta Wenta ◽  
Agnieszka Herman
Keyword(s):  
Boundary Layer ◽  
Sea Ice ◽  
Atmospheric Boundary Layer ◽  
Weather Prediction ◽  
Moisture Flux ◽  
Spatial Arrangement ◽  
Weather Research And Forecasting ◽  
Sea Ice Concentration ◽  
Surface Moisture ◽  
Ice Concentration

Sea ice fragmentation results in the transformation of the surface from relatively homogeneous to highly heterogeneous. Atmospheric boundary layer (ABL) rapidly responds to those changes through a range of processes which are poorly understood and not parametrized in numerical weather prediction (NWP) models. The aim of this work is to increase our understanding and develop parametrization of the ABL response to different floe size distributions (FSD). The analysis is based on the results of simulations with the Weather Research and Forecasting model. Results show that FSD determines the distribution and intensity of convection within the ABL through its influence on the atmospheric circulation. Substantial differences between various FSDs are found in the analysis of spatial arrangement and strength of ABL convection. To incorporate those sub-grid effects in the NWP models, a correction factor for the calculation of surface moisture heat flux is developed. It is expressed as a function of floe size, sea ice concentration and wind speed, and enables a correction of the flux computed from area-averaged quantities, as is typically done in NWP models. In general, the presented study sheds some more light on the sea ice–atmosphere interactions and provides the first attempt to parametrize the influence of FSD on the ABL.

New Findings concerning the Structure of the Marine Atmospheric Boundary Layer over the Baltic Sea – Possible Implications for Wind Energy Installations

2003 ◽  
Vol 27 (6) ◽  
pp. 431-447 ◽  
Author(s):  
Ann-Sofi Smedman ◽  
Ulf Högström ◽  
Hans Bergström ◽  
Cecilia Johansson ◽  
Anna Sjöblom ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wind Energy ◽  
Atmospheric Boundary Layer ◽  
Baltic Sea ◽  
Marine Atmospheric Boundary Layer ◽  
The Baltic Sea ◽  
New Findings ◽  
The Baltic

Linking the Atmospheric Boundary Layer to the Amundsen Gulf Sea-Ice Cover: A Mesoscale to Synoptic-Scale Perspective from Winter to Summer 2008

2011 ◽  
Vol 142 (1) ◽  
pp. 123-148 ◽  
Author(s):  
R. L. Raddatz ◽  
R. J. Galley ◽  
D. G. Barber
Keyword(s):  
Boundary Layer ◽  
Sea Ice ◽  
Atmospheric Boundary Layer ◽  
Ice Cover ◽  
Synoptic Scale ◽  
Amundsen Gulf
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