scholarly journals Assessing the Risks of Vessel Icing and Aviation Hazards during Downslope Windstorms in the Russian Arctic

Atmosphere ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 760
Author(s):  
Anna A. Shestakova
Keyword(s):  
Cold Season ◽  
Load Factor ◽  
Russian Arctic ◽  
Temperature Changes ◽  
Novaya Zemlya ◽  
Rapid Changes ◽  
Aviation Hazards ◽  
Rapid Temperature ◽  
Downslope Windstorms ◽  
Great Danger

Downslope windstorms are known sources of hazardous weather, such as severe gusty winds, rapid temperature changes, ship icing, strong turbulence and others, posing a great danger to people and infrastructure. This paper investigates the risks of ship icing and aviation hazards (rapid changes in the angle of attack and gust load factor) during downslope windstorms in five regions in the Russian Arctic based on observational data, reanalysis, and mesoscale numerical modeling. The highest frequency of ship icing was found during downslope windstorms downstream from Svalbard and Novaya Zemlya. Icing is rare during Tiksi and Wrangel Island downslope windstorms due to almost permanent sea ice cover during the cold season, while icing is absent during very warm Pevek downslope windstorm even in the ice-free conditions. Conditions for heavy icing are rather frequent (up to 5% of cases in winter) during Novaya Zemlya downslope windstorms and less frequent (up to 0.5% in spring) during Svalbard windstorm. The presence of downslope windstorms in those regions causes an increase in the maximum icing rate by about 2 times. Strong aviation turbulence hazardous for light aircraft is typical for all considered regions with downslope windstorms; it is observed mainly at an altitude of 1 to 4 km above the surface. Hazardous turbulence for jet aircraft like Boeing 737 on its cruising flight levels was found on Svalbard and in Tiksi region in 10–15% of cases during strong downslope windstorms.

scholarly journals Downslope windstorms and associated extreme wind speed statistics evaluation according to the COSMO-CLM Russian Arctic hindcast, ASR reanalysis and observations

2021 ◽  
Author(s):  
Vladimir Platonov ◽  
Anna Shestakova
Keyword(s):  
Wind Speed ◽  
Surface Wind ◽  
Temperature Fields ◽  
The Arctic ◽  
Russian Arctic ◽  
Novaya Zemlya ◽  
Wind Speeds ◽  
Extreme Wind ◽  
Extreme Wind Speed ◽  
Downslope Windstorms

<p>The number of severe weather events at the Arctic region increased significantly. Its formation related generally to the mesoscale processes including downslope windstorms over Novaya Zemlya, Svalbard, Tiksi bay accompanied by strong winds. Therefore, its investigation required detailed hydrometeorological and climatic information with a horizontal resolution of at least several kilometers. This work aims to investigate extreme wind speeds statistics associated with downslope windstorms and evaluate it according to the COSMO-CLM Russian Arctic hindcast, ASR reanalysis, stations and satellite data.</p><p>COSMO-CLM Russian Arctic hindcast created in 2020 covers the 1980–2016 period with grid size ~12 km and 1-hour output step, containing approximately a hundred hydrometeorological characteristics, as well at surface, as on the 50 model levels. The primary assessments of the surface wind speed and temperature fields showed good agreement with ERA-Interim reanalysis in large-scale patterns and many added values in the regional mesoscale features reproduction according to the coastlines, mountains, large lakes, and other surface properties.</p><p>Mean values, absolute and daily maxima of wind speed, high wind speed frequencies were estimated for the COSMO-CLM Russian Arctic hindcast and the well-known Arctic System Reanalysis (ASRv2) for a 2000-2016 period. COSMO-CLM showed higher mean and daily maximal wind speed areas concerned to coastal regions of Svalbard and Scandinavia, over the northern areas of Taymyr peninsula. At the same time, the absolute wind speed maxima are significantly higher according to ASRv2, specially over the Barents Sea, near the Novaya Zemlya coast (differences are up to 15-20 m/s). The same pattern observed by a number of days with wind speed above the 30 m/s threshold. Compared with station data, the ASRv2 reproduced mean wind speeds better at most coastal and inland station, MAE are within 3 m/s. For absolute wind speed maxima differences between two datasets get lower, the COSMO-CLM hindcast is quite better for inland stations.</p><p>Model capability to reproduce strong downslope windstorms evaluated according to the observations timeseries over Novaya Zemlya, Svalbard and Tiksi stations during bora conditions. Generally, the ASRv2 reproduced the wind direction closer to observations and the wind speed worser than COSMO-CLM. The extreme wind speed frequencies during bora cases have less errors according to COSMO-CLM hindcast (up to ~5%) compared to the ASRv2 data (up to 10%). At the same time, moderate wind speed frequencies are reproduced by ASRv2 better.</p><p>Five specific Novaya Zemlya bora cases were evaluated according to SAR satellite wind speed data. Both ASRv2 and COSMO-CLM overestimated mean wind speed (MAE 0.5-6 m/s), maximal wind speed bias has different signs, however, the COSMO-CLM is better in most cases. Extreme percentiles biases (99 and 99.9%), correlation, structure and amplitude (according to the SAL method) are closer to observations by the COSMO-CLM hindcast.</p>

scholarly journals Změna teplot sněhu při běhu na lyžích v obraze sekvenční termografie

2010 ◽  
Vol 4 (2) ◽  
pp. 109-118
Author(s):  
Jan Novotný ◽  
Jan Ondráček ◽  
Jan Novotný sr.
Keyword(s):  
Infrared Thermography ◽  
Paired Comparison ◽  
Wilcoxon Test ◽  
Graphic System ◽  
Temperature Changes ◽  
Change Of State ◽  
Rapid Changes ◽  
Baseline Temperature ◽  
Rapid Temperature ◽  
Dynamic Thermography

Twenty years ago it was shown that friction increases the temperature of snow skis. Change of state permits for water skis glide. Th e aim of this pilot study was to determine whether dynamic infrared thermography is able to capture rapid changes in temperature of snow some areas (not just at one point), the ski tracks before and aft er passing. We monitored the snow on the track aft er 60 races two runners in various weights (86 and 73 kg) on two types of skis and lubrication (for classic and skating cross) and three diff erent speeds (3,04±0,180, 3,81±0,273 a 5,30±0,314 m.s-1). Measurements of infrared radiation and the calculation of snow surface temperature immediately before and aft er passing skier was carried out thermo-graphic system FLIR SC620 with 30 Mhz. Nonparametric Wilcoxon test for paired comparison of values was found signifi cant increases in temperature aft er the snow cleared the skies: runner A from -3,71 to -3,50 °C (p=0,000000) and runner B from -3,75 na -3,50 °C (p=0,000000). To return to the baseline temperature is within 5 seconds aft er passing. Diff erences were demonstrated in the heat of snow between runners with diff erent masses and for the use of diff erent types of skis. Th e study confi rmed the ability of dynamic infrared thermography to register a very rapid temperature changes of snow in an area immediately before and aft er crossing the cross-country skiers. Dimensional dynamic thermography would seem to contribute to the choice of the correct strategy and lubrication in ski racing. However, it is necessary to make a series of validation studies.

Contributions to the lichen flora of the Novaya Zemlya Archipelago (Archangelsk Region, Russian Arctic)

2020 ◽  
Vol 54 (1) ◽  
pp. 117-126
Author(s):  
I. S. Zhdanov
Keyword(s):  
Lichen Species ◽  
Russian Arctic ◽  
Novaya Zemlya Archipelago ◽  
Ecological Preferences ◽  
Novaya Zemlya ◽  
Annotated List ◽  
History Of ◽  
Lichen Flora

The annotated list of 20 lichen species, based on the author’s collection, is presented. Atla wheldonii is new for Russia, and 16 species are new for Novaya Zemlya Archipelago. Morphology and ecological preferences of the lichen species new for the archipelago are discussed. The history of lichenological investigations in Novaya Zemlya is described.

scholarly journals Assessment of initial seismic impacts on the northern part of the Barents Sea shelf (Novaya Zemlya region) for the purpose of seismic microzoning in the areas of prospective hydrocarbon mining

2019 ◽  
pp. 38-47
Author(s):  
I. G. Mindel ◽  
B. A. Trifonov ◽  
M. D. Kaurkin ◽  
V. V. Nesynov
Keyword(s):  
Oil And Gas ◽  
Barents Sea ◽  
Arctic Shelf ◽  
The Arctic ◽  
Russian Arctic ◽  
Seismic Microzoning ◽  
Novaya Zemlya ◽  
The Barents Sea ◽  
National Task ◽  
Seismic Impacts

In recent years, in connection with the national task of developing the Arctic territories of Russia and the perspective increase in the hydrocarbon mining on the Arctic shelf, more attention is being paid to the study of seismicity in the Barents Sea shelf. The development of the Russian Arctic shelf with the prospect of increasing hydrocarbon mining is a strategically important issue. Research by B.A. Assinovskaya (1990, 1994) and Ya.V. Konechnaya (2015) allowed the authors to estimate the seismic effects for the northern part of the Barents Sea shelf (Novaya Zemlya region). The paper presents the assessment results of the initial seismic impacts that can be used to solve seismic microzoning problems in the areas of oil and gas infrastructure during the economic development of the Arctic territory.

Semi volatile organic compounds in the snow of Russian Arctic islands: Archipelago Novaya Zemlya

2018 ◽  
Vol 239 ◽  
pp. 416-427 ◽  
Author(s):  
A.T. Lebedev ◽  
D.M. Mazur ◽  
O.V. Polyakova ◽  
D.S. Kosyakov ◽  
A. Yu Kozhevnikov ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Russian Arctic ◽  
Novaya Zemlya ◽  
Volatile Organic

A global perspective on tropical montane rivers

Science ◽  
2019 ◽  
Vol 365 (6458) ◽  
pp. 1124-1129 ◽  
Author(s):  
Andrea C. Encalada ◽  
Alexander S. Flecker ◽  
N. LeRoy Poff ◽  
Esteban Suárez ◽  
Guido A. Herrera-R ◽  
...  
Keyword(s):  
Biological Diversity ◽  
Ecosystem Processes ◽  
High Elevation ◽  
Global Perspective ◽  
Model Systems ◽  
Flow Disturbance ◽  
Tropical Mountains ◽  
Rapid Changes ◽  
Rapid Temperature ◽  
Biodiversity And Ecosystem Function

Tropical montane rivers (TMR) are born in tropical mountains, descend through montane forests, and feed major rivers, floodplains, and oceans. They are characterized by rapid temperature clines and varied flow disturbance regimes, both of which promote habitat heterogeneity, high biological diversity and endemism, and distinct organisms’ life-history adaptations. Production, transport, and processing of sediments, nutrients, and carbon are key ecosystem processes connecting high-elevation streams with lowland floodplains, in turn influencing soil fertility and biotic productivity downstream. TMR provide key ecosystem services to hundreds of millions of people in tropical nations. In light of existing human-induced disturbances, including climate change, TMR can be used as natural model systems to examine the effects of rapid changes in abiotic drivers and their influence on biodiversity and ecosystem function.

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