scholarly journals Study of the Vertical Structure of the Coastal Boundary Layer Integrating Surface Measurements and Ground-Based Remote Sensing

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6516
Author(s):  
Teresa Lo Feudo ◽  
Claudia Roberta Calidonna ◽  
Elenio Avolio ◽  
Anna Maria Sempreviva
Keyword(s):  
Remote Sensing ◽  
Boundary Layer ◽  
Vertical Structure ◽  
Weather Prediction ◽  
Internal Boundary Layer ◽  
Internal Boundary ◽  
Maximum Height ◽  
Coastal Boundary Layer ◽  
Wind Profiles ◽  
Nwp Model

The understanding of the atmospheric processes in coastal areas requires the availability of quality datasets describing the vertical and horizontal spatial structure of the Atmospheric Boundary Layer (ABL) on either side of the coastline. High-resolution Numerical Weather Prediction (NWP) models can provide this information and the main ingredients for good simulations are: an accurate description of the coastline and a correct subgrid process parametrization permitting coastline discontinuities to be caught. To provide an as comprehensive as possible dataset on Mediterranean coastal area, an intensive experimental campaign was realized at a near-shore Italian site, using optical and acoustic ground-based remote sensing and surface instruments, under different weather characteristic and stability conditions; the campaign is also fully simulated by a NWP model. Integrating information from instruments responding to different atmospheric properties allowed for an explanation of the development of various patterns in the vertical structure of the atmosphere. Wind LiDAR measurements provided information of the internal boundary layer from the value of maximum height reached by the wind profile; a height between 80 and 130 m is often detected as an interface between two different layers. The NWP model was able to simulate the vertical wind profiles and the eight of the ABL.

scholarly journals Observed development of the vertical structure of the marine boundary layer during the LASIE experiment in the Ligurian Sea

2010 ◽  
Vol 28 (1) ◽  
pp. 17-25 ◽  
Author(s):  
A. M. Sempreviva ◽  
M. E. Schiano ◽  
S. Pensieri ◽  
A. Semedo ◽  
R. Tomé ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Vertical Structure ◽  
Marine Boundary Layer ◽  
Potential Temperature ◽  
Internal Boundary Layer ◽  
Surface Flow ◽  
Internal Boundary ◽  
Research Centre ◽  
Ligurian Sea ◽  
Entire Depth

Abstract. In the marine environment, complete datasets describing the surface layer and the vertical structure of the Marine Atmospheric Boundary Layer (MABL), through its entire depth, are less frequent than over land, due to the high cost of measuring campaigns. During the seven days of the Ligurian Air-Sea Interaction Experiment (LASIE), organized by the NATO Undersea Research Centre (NURC) in the Mediterranean Sea, extensive in situ and remote sensing measurements were collected from instruments placed on a spar buoy and a ship. Standard surface meteorological measurements were collected by meteorological sensors mounted on the buoy ODAS Italia1 located in the centre of the Gulf of Genoa. The evolution of the height (zi) of the MABL was monitored using radiosondes and a ceilometer on board of the N/O Urania. Here, we present the database and an uncommon case study of the evolution of the vertical structure of the MABL, observed by two independent measuring systems: the ceilometer and radiosondes. Following the changes of surface flow conditions, in a sequence of onshore – offshore – onshore wind direction shifting episodes, during the mid part of the campaign, the overall structure of the MABL changed. Warm and dry air from land advected over a colder sea, induced a stably stratified Internal Boundary Layer (IBL) and a consequent change in the structure of the vertical profiles of potential temperature and relative humidity.

scholarly journals Role of Atmospheric Boundary Layer (ABL) Height and Ventilation Coefficient on Urban Air Quality- A study based on Observations and NWP Model

2019 ◽  
Vol 2 (3) ◽  
Author(s):  
Aditi Singh
Keyword(s):  
Boundary Layer ◽  
Air Quality ◽  
Atmospheric Boundary Layer ◽  
Air Pollutants ◽  
Weather Prediction ◽  
Urban Region ◽  
Maximum Height ◽  
Nwp Model ◽  
Ventilation Coefficient

Air pollution is an issue of great concern in any urban region due to its serious health implications. The capital of India, New Delhi continues to be in the list of most polluted cities since 2014. The air quality of any region depends on the ability of dispersion of air pollutants. The height or depth of the atmospheric boundary layer (ABL) is one measure of dispersion of air pollutants. Ventilation coefficient is another crucial parameter in determining the air quality of any region. Both of these parameters are obtained over Delhi from the operational global numerical weather prediction (NWP) model of National Centre for Medium Range Weather forecasting (NCMRWF) known as NCMRWF Unified Model (NCUM). The height of ABL over Delhi, is also obtained from radiosonde observations using the parcel method. A good agreement is found between the observed and predicted values of ABL height. The maximum height of ABL is obtained during summer season and minimum is obtained in winter season. High values of air pollutants are found when the values of ABL height and ventilation coefficient are low. 

INTEGRAL TRANSFORM SOLUTION FOR THE INTERNAL BOUNDARY LAYER OF NON-NEWTONIAN FLUIDS

1999 ◽  
Vol 1 (2) ◽  
pp. 12 ◽  
Author(s):  
R. N. O. Magno ◽  
Joao N. N. Quaresma ◽  
E. N. Macedo
Keyword(s):  
Boundary Layer ◽  
Integral Transform ◽  
Internal Boundary Layer ◽  
Newtonian Fluids ◽  
Internal Boundary

A study of wind speed modification and internal boundary-layer heights in a coastal region

1988 ◽  
Vol 42 (4) ◽  
pp. 313-335 ◽  
Author(s):  
Hans Bergström ◽  
Per-Erik Johansson ◽  
Ann-Sofi Smedman
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Coastal Region ◽  
Internal Boundary Layer ◽  
Internal Boundary

Fine structure of the internal boundary layer in the near-shore zone of the sea

1976 ◽  
Vol 10 (4) ◽  
pp. 503-505 ◽  
Author(s):  
P. Hupfer ◽  
Th. Foken ◽  
U. Bachstein
Keyword(s):  
Boundary Layer ◽  
Fine Structure ◽  
Internal Boundary Layer ◽  
Internal Boundary ◽  
Shore Zone ◽  
Near Shore

scholarly journals On the internal boundary layer related wind stress curl and its role in generating shallow lake circulations

2014 ◽  
Vol 62 (1) ◽  
pp. 16-23 ◽  
Author(s):  
János Józsa
Keyword(s):  
Boundary Layer ◽  
Wind Stress ◽  
Shallow Lake ◽  
Large Scale ◽  
Internal Boundary Layer ◽  
Internal Boundary ◽  
Development Theory ◽  
Wind Stress Curl ◽  
Flow Models ◽  
Boundary Layer Development

Abstract The paper demonstrates that the wind stress curl as an external vorticity source plays an important role in shaping large scale shallow lake circulations. The analysis of purpose-oriented simultaneous wind and current measurements data from the Hungarian part of Lake Neusiedl reasonably fits well the internal boundary layer development theory over the lake surface. A 2-D vorticity formulation of wind-induced flows is used to demonstrate mathematically the IBL-related large scale circulation generation mechanism well reflected in the measured data. Further validation of the findings is carried out by means of simple 2-D numerical flow modelling, in which details on the flow pattern besides the measurement sites could be also revealed. Wind-induced lake circulations linked to IBL development shows a novelty to be implemented in up-to-date numerical flow models.

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