scholarly journals Breeze effects at a large artificial lake: summer case study

2018 ◽  
Author(s):  
Maksim Iakunin ◽  
Rui Salgado ◽  
Miguel Potes
Keyword(s):  
Western Europe ◽  
Atmospheric Model ◽  
Artificial Lake ◽  
Natural Lakes ◽  
Input Surface ◽  
Alqueva Reservoir ◽  
Mesoscale Atmospheric Model ◽  
Surrounding Areas ◽  
The Impact

Abstract. Natural lakes and big artificial reservoirs could affect the weather regime of surrounding areas but usually it is difficult to track all aspects of this impact and evaluate its magnitude. Alqueva reservoir, the largest artificial lakes in Western Europe located on the South-East of Portugal, was filled in 2004. This makes it a large laboratory and allows to study the changes in hydrological and geological structures and how they affect the weather in the region. This paper is focused on a case study of the 3 days period of 22–24 July 2014. In order to quantify the breeze effects induced by Alqueva reservoir two simulations with the mesoscale atmospheric model Meso-NH coupled to FLake freshwater lake scheme has been done. The principal difference of this two simulations is in the presence of the reservoir in the input surface data. Comparing two simulations datasets: with and without reservoir, net results of the lake impact were obtained. Magnitude of the impact on the air temperature, relative humidity, and other atmospheric parameters is shown. Clear effect of a lake breeze (5–7 m/s) can be observed during the daytime on the distances up to 6 km away from the shores and up to 300 m over the lake surface. Breeze system starts to form at 9:00 UTC and dissipates at 18:00–19:00 UTC with the arrival of major Atlantic breeze system. It induces specific air circulation that captures the dry air from the upper atmosphere (2–2.5 km) which follows the downstream and redistributes over the lake. It is also shown that the although the impact can be relatively intensive, its area is limited by several kilometers away from the lake borders.

scholarly journals Breeze effects at a large artificial lake: summer case study

2018 ◽  
Vol 22 (10) ◽  
pp. 5191-5210 ◽  
Author(s):  
Maksim Iakunin ◽  
Rui Salgado ◽  
Miguel Potes
Keyword(s):  
Western Europe ◽  
Atmospheric Model ◽  
Lake Breeze ◽  
Artificial Lake ◽  
Natural Lakes ◽  
Alqueva Reservoir ◽  
The Difference ◽  
Surrounding Areas ◽  
The Impact

Abstract. Natural lakes and big artificial reservoirs can affect the weather regime of surrounding areas but, usually, consideration of all aspects of this impact and their quantification is a difficult task. The Alqueva reservoir, the largest artificial lake in western Europe, located on the south-east of Portugal, was filled in 2004. It is a large natural laboratory that allows the study of changes in surface and in landscape and how they affect the weather in the region. This paper is focused on a 3-day case study, 22–24 July 2014, during which an intensive observation campaign was carried out. In order to quantify the breeze effects induced by the Alqueva reservoir, two simulations with the mesoscale atmospheric model Meso-NH coupled to the FLake freshwater lake model has been performed. The difference between the two simulations lies in the presence or absence of the reservoir on the model surface. Comparing the two simulation datasets, with and without the reservoir, net results of the lake impact were obtained. Magnitude of the impact on air temperature, relative humidity, and other atmospheric variables are shown. The clear effect of a lake breeze (5–7 m s−1) can be observed during daytime on distances up to 6 km away from the shores and up to 300 m above the surface. The lake breeze system starts to form at 09:00 UTC and dissipates at 18:00–19:00 UTC with the arrival of a larger-scale Atlantic breeze. The descending branch of the lake breeze circulation brings dry air from higher atmospheric layers (2–2.5 km) and redistributes it over the lake. It is also shown that despite its significant intensity the effect is limited to a couple of kilometres away from the lake borders.

scholarly journals Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier

2018 ◽  
Vol 64 (247) ◽  
pp. 811-821 ◽  
Author(s):  
STEFAN LIPPL ◽  
SAURABH VIJAY ◽  
MATTHIAS BRAUN
Keyword(s):  
Large Scale ◽  
Window Size ◽  
Radar Data ◽  
Morphological Operations ◽  
L Band ◽  
Surrounding Areas ◽  
Coherence Estimation ◽  
The Impact

ABSTRACTDespite their importance for mass-balance estimates and the progress in techniques based on optical and thermal satellite imagery, the mapping of debris-covered glacier boundaries remains a challenging task. Manual corrections hamper regular updates. In this study, we present an automatic approach to delineate glacier outlines using interferometrically derived synthetic aperture radar (InSAR) coherence, slope and morphological operations. InSAR coherence detects the temporally decorrelated surface (e.g. glacial extent) irrespective of its surface type and separates it from the highly coherent surrounding areas. We tested the impact of different processing settings, for example resolution, coherence window size and topographic phase removal, on the quality of the generated outlines. We found minor influence of the topographic phase, but a combination of strong multi-looking during interferogram generation and additional averaging during coherence estimation strongly deteriorated the coherence at the glacier edges. We analysed the performance of X-, C- and L- band radar data. The C-band Sentinel-1 data outlined the glacier boundary with the least misclassifications and a type II error of 0.47% compared with Global Land Ice Measurements from Space inventory data. Our study shows the potential of the Sentinel-1 mission together with our automatic processing chain to provide regular updates for land-terminating glaciers on a large scale.

scholarly journals Risk Assessment and the Environmental Impact of Industrial Projects in Malaysia: A case study of SAMUR, Sabah

2017 ◽  
Vol 2 (5) ◽  
pp. 507
Author(s):  
Ezyana Anyzah Marmaya ◽  
Rohana Mahbub
Keyword(s):  
Risk Factors ◽  
Risk Assessment ◽  
Environmental Impact ◽  
High Performance ◽  
Publishing House ◽  
Industrial Projects ◽  
Negative Environmental Impact ◽  
Surrounding Areas ◽  
The Impact

To ensure high performance of projects, risk factors and their impact towards the environment need to be addressed during and after the construction phase. This research aims to assess the risk factors and the impact of industrial projects to the environment and surrounding areas. The research employs multi-method strategies: this case study includes several interviews, observations, analysis of project documents and questionnaires distributed among the occupants living in the surrounding area. The results of the research indicated that the project is perceived to have negative environmental impact measured under ecosystem, natural resources, and public impact.Keywords: risk assessment, risk factors, environmental impact, industrial projects, MalaysiaISSN: 2398-4287© 2017. The Authors. Published for AMER ABRA by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.

scholarly journals The Impact of the Internalization of External Costs in the Competitiveness of Short Sea Shipping

2021 ◽  
Vol 9 (9) ◽  
pp. 959
Author(s):  
Mónica M. Ramalho ◽  
Tiago A. Santos
Keyword(s):  
Western Europe ◽  
External Costs ◽  
Modal Shift ◽  
Short Sea Shipping ◽  
Marginal Costs ◽  
Mode Of Transportation ◽  
Internal Costs ◽  
The Impact ◽  
Made In

This paper applies a methodology for computing external costs in an intermodal transport network that includes short sea shipping to explore the impact of external costs in its competitiveness. The network, which includes roads, freight railways, maritime and inland waterway connections, considers the specific characteristics of different transport alternatives and vehicle types, providing a fair comparison of the various modes. A case study focused on freight transportation between Northern Portugal and 75 destinations (NUTS2 regions) in north-western Europe is presented. The potential of different intermodal routes that include short sea shipping is assessed, including not only internal costs and times but also external costs per mode and unit of cargo. The impact of the different cost approaches in each country of transit is shown along with the progress that has been made in the integration of external costs, using the most recent EU estimates on marginal costs coverage ratios per country for freight transport modes. The results support the modal shift from road to sea in this corridor, providing means for modal comparison and for the development of short sea shipping’s image as a sustainable mode of transportation.

scholarly journals The Representation of Roma in the Romanian Media During COVID-19: Performing Control Through Discursive-Performative Repertoires

2021 ◽  
Vol 3 ◽  
Author(s):  
Ionut Chiruta
Keyword(s):  
Eastern Europe ◽  
Western Europe ◽  
Critical Social Theory ◽  
Health Crisis ◽  
Mainstream Media ◽  
The Media ◽  
Media Discourses ◽  
The Impact ◽  
The Town

This article investigates the narratives employed by the Romanian media in covering the development of COVID-19 in Roma communities in Romania. This paper aims to contribute to academic literature on Romani studies, particularly in Central and Eastern Europe, by adopting as its case study the town of Ţăndărei, a small town in the south of Romania, which in early 2020 was widely reported by Romanian media during both the pre- and post-quarantine period. The contributions rest on anchoring the study in post-foundational theory and media studies to understand the performativity of Roma identity and the discursive-performative practices of control employed by the Romania media in the first half of 2020. Aroused by the influx of ethnic Romani returning from Western Europe, the Romanian mainstream media expanded its coverage through sensationalist narratives and depictions of lawlessness and criminality. These branded the ethnic minority as a scapegoat for the spreading of the virus. Relying on critical social theory, this study attempts to understand how Roma have been portrayed during the Coronavirus crisis. Simultaneously, this paper resonates with current Roma theories about media discourses maintaining and reinforcing a sense of marginality for Roma communities. To understand the dynamics of Romanian media discourses, this study employs NVivo software tools and language-in-use discourse analysis to examine the headlines and sub headlines of approximately 300 articles that have covered COVID-19 developments in Roma communities between February and July 2020. The findings from the study indicate that the media first focused on exploiting the sensationalism of the episodes involving Roma. Second, the media employed a logic of polarization to assist the authorities in retaking control of the pandemic and health crisis from Romania. The impact of the current study underlines the need to pay close attention to the dynamics of crises when activating historical patterns of stigma vis-à-vis Roma communities in Eastern Europe.

scholarly journals Transport of dust particles from the Bodélé region to the monsoon layer: AMMA case study of the 9–14 June 2006 period

2010 ◽  
Vol 10 (2) ◽  
pp. 5051-5090 ◽  
Author(s):  
S. Crumeyrolle ◽  
P. Tulet ◽  
L. Garcia-Carreras ◽  
C. Flamant ◽  
D. J. Parker ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Dust Particle ◽  
Particle Concentration ◽  
Strong Relationship ◽  
Atmospheric Model ◽  
Dust Particles ◽  
Particle Sedimentation ◽  
Surface Cover ◽  
Mesoscale Atmospheric Model ◽  
The Impact

Abstract. Aerosol properties were measured during an airborne campaign experiment that took place in June 2006 in West Africa within the framework of the African Monsoon Multidisciplinary Analyses (AMMA). The goal of the present study was to determine the process that facilitates the sedimentation of dust particles from the Saharan Air Layer (SAL) to the boundary layer. A significant change in the dust particle concentration measured along the meridian between Niamey (Niger) and Cotonou (Benin) was found in the boundary layer (~700 m), where the dust particle concentration increased in a zone where local emission is not possible. Moreover, the boundary layer top observed with the dropsondes launched with the F-F20 shows a strong relationship with the surface cover anomalies, with higher Boundary Layer (BL) tops over the warmer surfaces, such as croplands, as opposed to adjacent forest. A mesoscale atmospheric model with a new on-line dust parameterization, resulting from the Alfaro and Gomes (2001) parametrisation and AMMA observations, was used to interpret the impact of vegetation anomalies on dust particle sedimentation. The results of the simulation are consistent with the observations, with higher dust over the warm surface cover anomalies.

scholarly journals Numerical study of the seasonal thermal and gas regimes of the largest artificial reservoir in western Europe using the LAKE 2.0 model

2020 ◽  
Vol 13 (8) ◽  
pp. 3475-3488 ◽  
Author(s):  
Maksim Iakunin ◽  
Victor Stepanenko ◽  
Rui Salgado ◽  
Miguel Potes ◽  
Alexandra Penha ◽  
...  
Keyword(s):  
Western Europe ◽  
Numerical Study ◽  
Thermal Structure ◽  
Thermodynamic Simulation ◽  
Regional Climate ◽  
Heat Fluxes ◽  
Artificial Lake ◽  
Numerical Studies ◽  
Water Surface Temperature ◽  
Alqueva Reservoir

Abstract. The Alqueva reservoir (southeast of Portugal) is the largest artificial lake in western Europe and a strategic freshwater supply in the region. The reservoir is of scientific interest in terms of monitoring and maintaining the quality and quantity of water and its impact on the regional climate. To support these tasks, we conducted numerical studies of the thermal and gas regimes in the lake over the period from May 2017 to March 2019, supplemented by the data observed at the weather stations and floating platforms during the field campaign of the ALentejo Observation and Prediction (ALOP) system project. The 1D model, LAKE 2.0, was used for the numerical studies. Since it is highly versatile and can be adjusted to the specific features of the reservoir, this model is capable of simulating its thermodynamic and biogeochemical characteristics. Profiles and time series of water temperature, sensible and latent heat fluxes, and concentrations of CO2 and O2 reproduced by the LAKE 2.0 model were validated against the observed data and were compared to the thermodynamic simulation results obtained with the freshwater lake (FLake) model. The results demonstrated that both models captured the seasonal variations in water surface temperature and the internal thermal structure of the Alqueva reservoir well. The LAKE 2.0 model showed slightly better results and satisfactorily captured the seasonal gas regime.

Assimilation of GPS Radio Occultation Data for an Intense Atmospheric River with the NCEP Regional GSI System

2011 ◽  
Vol 139 (7) ◽  
pp. 2170-2183 ◽  
Author(s):  
Zaizhong Ma ◽  
Ying-Hwa Kuo ◽  
F. Martin Ralph ◽  
Paul J. Neiman ◽  
Gary A. Wick ◽  
...  
Keyword(s):  
Western Europe ◽  
Radio Occultation ◽  
Single Case ◽  
Horizontal Structure ◽  
Observation Operator ◽  
Gps Radio Occultation ◽  
Phase Observation ◽  
Excess Phase ◽  
The Impact

Abstract This paper uses a case study to explore the potential of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) and Challenging Minisatellite Payload (CHAMP) global positioning system (GPS) radio occultation (RO) satellite data over the eastern Pacific Ocean to improve analyses and mesoscale forecasts of landfalling atmospheric rivers (ARs) along the U.S. West Coast. The case study is from early November 2006 and was a very high-impact event in the Pacific Northwest where it created torrential rainfall and severe flooding. Recent studies have shown that the COSMIC data offshore have the ability to better define the vertical and horizontal structure of the strong AR. This paper extends the earlier work by assessing the impact of assimilating the COSMIC data into the Advanced Research Weather Research and Forecasting (ARW-WRF) mesoscale numerical model (using a nested mode with 36-, 12-, and 4-km grid sizes) on a key 24-h forecast. The data are assimilated using NCEP’s Gridpoint Statistical Interpolation (GSI), and impacts are evaluated using Special Sensor Microwave Imager (SSM/I) satellite observations over the ocean and precipitation observations over land. The assimilation of GPS RO soundings made use of a local refractivity observation operator as well as an advanced nonlocal excess phase observation operator that considers the effects of atmospheric horizontal gradients. The results show that the assimilation of GPS RO soundings improved the moisture analysis for this AR event. This result supports conclusions from earlier observing systems simulation experiment (OSSE) studies, but in a real event. The use of a nonlocal excess phase observation operator can produce larger and more robust analysis increments. Although this is a single case study, the results are likely representative of the potential impacts of assimilating COSMIC data in other extreme AR and precipitation events and in other regions affected by landfalling ARs, for example, western Europe, western South America, and New Zealand.

Sign in / Sign up

Export Citation Format

Share Document