Comparative assessment of the microclimate in the «Cape Martyan» Nature Reserve according to two weather stations

2019 ◽  
pp. 34-43
Author(s):  
S. P. Korsakova ◽  
P. B. Korsakov
Keyword(s):  
Relative Humidity ◽  
Nature Reserve ◽  
Warm Season ◽  
Comparative Assessment ◽  
Meteorological Station ◽  
Air Temperatures ◽  
Spatio Temporal ◽  
Meteorological Observations ◽  
Conducting Research ◽  
Night Period

A comparative assessment of the microclimate in the «Cape Martyan» Nature Reserve according to meteorological observations in meteorological station "Lavrovoe" and the climate agrometeorological station "Nikitsky sad" is given. As a result of the conducted researches homogeneity and spatio-temporal connectedness of climatic parameters within the investigated territory is established. Statistically significant differences in average and maximum values of air temperature, precipitation and relative humidity between the meteorological station "Lavrovoe" and the climate agrometeorological station "Nikitsky sad" were not revealed. This indicates to the representativeness of the data agrometeorological station for the territory of the «Cape Martyan» Nature Reserve. Statistically significant differences established for minimum air temperatures and relative humidity during the cold period should be taken into account when conducting research in the Eastern part of the Nature Reserve. It was found that the wind regime in the area of the observations by meteorological station "Lavrovoe" in the night period is characterized by air drainage phenomena and the predominance of breeze circulation in the warm season, which largely determine the microclimatic differences between observed meteorological values by station "Lavrovoe" and by station "Nikitsky sad", especially when the radiation weather type.

scholarly journals LOCAL MANIFESTATIONS OF CLIMATE CHANGES ON THE EXAMPLE OF “MEDOBORY” NATURE RESERVE DURING 2006-2020

2021 ◽  
Vol 51 (2) ◽  
pp. 64-73
Author(s):  
Iryna Bugalska
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Nature Reserve ◽  
Average Length ◽  
Dust Storms ◽  
Herbaceous Plant ◽  
Natural Phenomena ◽  
Entire Observation Period ◽  
Air Temperatures ◽  
Observation Period

The analysis of the main meteorological indicators, given according to the data of hydrometeorological post  in the village of Hrymailiv for the last fifteen years, is presented. The dynamics of changes in the average annual, monthly and daily, minimum, maximum air temperatures, precipitation, relative humidity, atmospheric pressure, etc. has been studied for the Nature Reserve "Medobory", the analysis of climatic features of months for the period of 2006-2020 is carried out. The temperature mode of the Reserve during the year is marked by considerable fluctuations of temperatures: from + 18,9ºС in July to -4,7ºС in January. The established duration of seasons is marked by strong variability, which is a sign of climate changing: the shortest and latest winter in the period of investigation recorded in 2016, began on December 29 and lasted 42 days, and the longest one - in 2018, lasted 130 days; the longest spring was in 2020 - 116 days, the shortest one - in 2018, lasted 30 days. The longest summer in 2018 lasted 147 days; in 2017-2018 a significant decrease in average daily air temperatures in the first half of July was observed; August and September parts of summer in 2016-2020 were hot, with fairly high maximums and very little precipitation. The latest beginning of autumn for the entire observation period is September 27, 2020, the shortest season - in 2016, only 53 days. The duration of autumn decreases, the average value reaches 75 days, the duration of summer increases - 112 days. It is noted that the nature of precipitation has changed - rain falls in the form of heavy, short-term showers, for one downpour the monthly norm of precipitations can fall out; over the last five years, the average length of the growing season has increased by 19 days and 13 days more than the average for fifteen years,  the sum of active temperatures above the average for the last five years by 299.3ºC, for the last fifteen years - by 183.5ºС. On the territory of the Nature Reserve "Medobory" other local manifestations of climate changing were recorded, expressed as follows: the average annual air temperature over the past five years increased by 0.5 ° C (the warmest for the entire observation period was 2020 with an average temperature of 10, 1ºС, just then there were 43 days in winter (61%) with positive daily average air temperatures); meteorological natural phenomena of nature became more frequent: heavy rains, snowfalls, heavy hail showers, ice, fogs, dust storms, ice frosting-up; exceeded the maximum air temperature for the last five years: October 3, 2016 (27.0 ° C), August 3, 2017 (38.5 ° C), May 25, 2018 (34.0 ° C), 21 June 2018 (34.0ºC), March 31, 2019 (21.2ºC), and the minimum - June 8, 2016 (0.0°C), July 7, 2017 (4.7°C), September 30, 2018 (-2.5°C), April 1, 2020 (-7.0°C). The latest spring light frost recorded on May 22, 2020 (-1.0ºC), which led to mass frosting-up of herbaceous plant species. Every autumn at the end of September, light frosts are already registered: -1.5ºC - September 28, 2016, -1.0ºC and -0.9ºC - September 29 and  September 30, 2017, -2.5ºC - September 30, 2018, - 1.8ºС - September 21, 2019, -1.0ºС - September 19, 2020, the last one - the earliest during the observation period and also in the summer part of September. For the first time in 2020, the relative humidity in March was 16% below normal, mainly due to the second and third decades (58% and 47% correspondingly), in April it was only 39% - 27% below normal. Such deviations were not observed even in the dry summer and autumn months. Key words: air temperature, precipitation, climatic seasons, meteorological natural phenomena.

scholarly journals Temperature and Relative Humidity Profile Retrieval from Fengyun-3D/HIRAS in the Arctic Region

2021 ◽  
Vol 13 (10) ◽  
pp. 1884
Author(s):  
Jingjing Hu ◽  
Yansong Bao ◽  
Jian Liu ◽  
Hui Liu ◽  
George P. Petropoulos ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Real Time ◽  
Wide Spectrum ◽  
Warm Season ◽  
Arctic Region ◽  
Cold Season ◽  
The Arctic ◽  
Practical Applications ◽  
A New Technique ◽  
The Arctic Region

The acquisition of real-time temperature and relative humidity (RH) profiles in the Arctic is of great significance for the study of the Arctic’s climate and Arctic scientific research. However, the operational algorithm of Fengyun-3D only takes into account areas within 60°N, the innovation of this work is that a new technique based on Neural Network (NN) algorithm was proposed, which can retrieve these parameters in real time from the Fengyun-3D Hyperspectral Infrared Radiation Atmospheric Sounding (HIRAS) observations in the Arctic region. Considering the difficulty of obtaining a large amount of actual observation (such as radiosonde) in the Arctic region, collocated ERA5 data from European Centre for Medium-Range Weather Forecasts (ECMWF) and HIRAS observations were used to train the neural networks (NNs). Brightness temperature and training targets were classified using two variables: season (warm season and cold season) and surface type (ocean and land). NNs-based retrievals were compared with ERA5 data and radiosonde observations (RAOBs) independent of the NN training sets. Results showed that (1) the NNs retrievals accuracy is generally higher on warm season and ocean; (2) the root-mean-square error (RMSE) of retrieved profiles is generally slightly higher in the RAOB comparisons than in the ERA5 comparisons, but the variation trend of errors with height is consistent; (3) the retrieved profiles by the NN method are closer to ERA5, comparing with the AIRS products. All the results demonstrated the potential value in time and space of NN algorithm in retrieving temperature and relative humidity profiles of the Arctic region from HIRAS observations under clear-sky conditions. As such, the proposed NN algorithm provides a valuable pathway for retrieving reliably temperature and RH profiles from HIRAS observations in the Arctic region, providing information of practical value in a wide spectrum of practical applications and research investigations alike.All in all, our work has important implications in broadening Fengyun-3D’s operational implementation range from within 60°N to the Arctic region.

scholarly journals Quantifying the Independent Influences of Land Cover and Humidity on Microscale Urban Air Temperature Variation in Hot Summer: Methods of Path Analysis and Genetic SVR

Atmosphere ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1377
Author(s):  
Weifang Shi ◽  
Nan Wang ◽  
Aixuan Xin ◽  
Linglan Liu ◽  
Jiaqi Hou ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Land Cover ◽  
Path Analysis ◽  
Temperature Variation ◽  
Direct Effect ◽  
Air Temperature ◽  
Urban Areas ◽  
Support Vector ◽  
Urban Air ◽  
Air Temperatures

Mitigating high air temperatures and heat waves is vital for decreasing air pollution and protecting public health. To improve understanding of microscale urban air temperature variation, this paper performed measurements of air temperature and relative humidity in a field of Wuhan City in the afternoon of hot summer days, and used path analysis and genetic support vector regression (SVR) to quantify the independent influences of land cover and humidity on air temperature variation. The path analysis shows that most effect of the land cover is mediated through relative humidity difference, more than four times as much as the direct effect, and that the direct effect of relative humidity difference is nearly six times that of land cover, even larger than the total effect of the land cover. The SVR simulation illustrates that land cover and relative humidity independently contribute 16.3% and 83.7%, on average, to the rise of the air temperature over the land without vegetation in the study site. An alternative strategy of increasing the humidity artificially is proposed to reduce high air temperatures in urban areas. The study would provide scientific support for the regulation of the microclimate and the mitigation of the high air temperature in urban areas.

scholarly journals Modelização do clima urbano de Santa Maria, RS

1986 ◽  
Vol 8 (8) ◽  
pp. 53
Author(s):  
Maria Da Graça Barros Sartori
Keyword(s):  
Relative Humidity ◽  
Atmospheric Circulation ◽  
Urban Climate ◽  
Rio Grande ◽  
Meteorological Station ◽  
The State ◽  
Local Analysis ◽  
Rio Grande Do Sul ◽  
Local Climate ◽  
Santa Maria

Urbanization causes changes in the local climate by altering the atmosphere of a city and creating the urban climate. Attempting to verify the existence of urban climate in Santa Maria, climatic analysis was made of temperature, wind and relative humidity of data gathered in the field as well as from the meteorological station, in relaction to the regional atmospheric circulation analysis. The results of this study and samples from national and international finding, together with the local analysis of geoecological and geourban components, help in presenting a simulating model of the urban climate of Santa Maria located in the center of the State of Rio Grande do Sul, Brazil.

scholarly journals The Meteorological Observations in Coimbra and the Portuguese Participation in Weather Forecasting in Europe

2011 ◽  
Vol 30 (1) ◽  
pp. 135-162 ◽  
Author(s):  
António Leonardo ◽  
Décio Martins ◽  
Carlos Fiolhais
Keyword(s):  
Weather Forecasting ◽  
Natural Philosophy ◽  
Meteorological Station ◽  
Scientific Investigation ◽  
Magnetic Observatory ◽  
Early Nineteenth Century ◽  
Meteorological Observatory ◽  
The Creation ◽  
Meteorological Observations ◽  
The University

In the early nineteenth century, regular meteorological observations started at the Faculty of Natural Philosophy of the University of Coimbra (FPUC). From 1854 to 1856 these observations were published in O Instituto, a journal of an academic society of the same name, founded in Coimbra in 1852. This new area of science aroused great interest, offering itself as unexplored territory waiting for scientific investigation. In reaction to the pioneering work at the Polytechnic School of Lisbon of Guilherme Pegado, who founded the first meteorological observatory in Portugal in 1854, the FPUC established a Meteorological and Magnetic Observatory in Coimbra. The main actor was, from 1863, the physicist Jacinto António de Sousa. In the twentieth century, the increasing need for weather forecasting, especially at sea, led to the creation of the Meteorological Services of the Navy in which Carvalho Brandão played a pivotal role. It was the beginning of an international cooperation that brought Jacob Bjerknes to Portugal. He addressed a conference at Coimbra recommending the creation of a meteorological station in the Azores, to relay observational data from vessels travelling in the Atlantic. The Portuguese meteorological services were scattered in various institutions until 1946, when the National Meteorological Services (NMS) were created. Based on articles published in O Instituto and on the activities of the academy with the same name, we provide an overview of the evolution of meteorology in Portugal until the establishment of the NMS, with particular emphasis on the work of the Meteorological and Magnetic Observatory at the University of Coimbra.

scholarly journals Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments

2021 ◽  
Author(s):  
Jonathan H. Raberg ◽  
David J. Harning ◽  
Sarah E. Crump ◽  
Greg de Wet ◽  
Aria Blumm ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Lake Sediment ◽  
Membrane Lipids ◽  
Warm Season ◽  
Environmental Parameters ◽  
Structural Diversity ◽  
Temperature Conductivity ◽  
Advantages And Disadvantages ◽  
Natural Logarithm ◽  
Air Temperatures

Abstract. Distributions of branched glycerol dialkyl glycerol tetraethers (brGDGTs) are frequently employed for reconstructing terrestrial paleotemperatures from lake sediment archives. Although brGDGTs are globally ubiquitous, the microbial producers of these membrane lipids remain unknown, precluding a full understanding of the ways in which environmental parameters control their production and distribution. Here, we advance this understanding in three ways. First, we present 43 new high-latitude lake sites characterized by low mean annual air temperatures (MATs) and high seasonality, filling an important gap in the global dataset. Second, we introduce a new approach for analyzing brGDGT data in which compound fractional abundances (FAs) are calculated within structural groups based on methylation number, methylation position, and cyclization number. Finally, we perform linear and nonlinear regressions of the resulting FAs against a suite of environmental parameters in a compiled global lake sediment dataset (n = 182). We find that our approach deconvolves temperature, conductivity, and pH trends in brGDGTs without increasing calibration errors from the standard approach. We also find that it reveals novel patterns in brGDGT distributions and provides a methodology for investigating the biological underpinnings of their structural diversity. Warm-season temperature indices outperformed MAT in our regressions, with Months Above Freezing yielding the highest-performing model (adjusted R2 = 0.91, RMSE = 1.97 °C, n = 182). The natural logarithm of conductivity had the second-strongest relationship to brGDGT distributions (adjusted R2 = 0.83, RMSE = 0.66, n = 143), notably outperforming pH in our dataset (adjusted R2 = 0.73, RMSE = 0.57, n = 154) and providing a potential new proxy for paleohydrology applications. We recommend these calibrations for use in lake sediments globally, including at high latitudes, and detail the advantages and disadvantages of each.

scholarly journals A Heat-Balance Study on Sørbreen, Jan Mayen

1965 ◽  
Vol 5 (42) ◽  
pp. 793-803
Author(s):  
P. C. Dibben
Keyword(s):  
Heat Transfer ◽  
Heat Balance ◽  
Summer Rainfall ◽  
Weather Conditions ◽  
Meteorological Station ◽  
Sensible Heat ◽  
Balance Study ◽  
Statistical Comparison ◽  
Air Temperatures ◽  
Frontal Activity

AbstractThe techniques and results of a heat-balance programme on Sørbreen, Jan Mayen, are presented and discussed. Estimates of 24 hr. heat-transfer totals under frontal and non-frontal weather conditions are then made. Transfer is found to be higher during frontal conditions, due to an increase in latent and to a lesser extent sensible heat transfer. Consideration of upper air temperatures and humidities suggests this higher transfer is experienced by the glacier as a whole. It is then proposed that summer rainfall totals will provide an index of frontal activity which may be used to indicate relative ablation from one summer to another. A statistical comparison of ablation measured on the glacier and rainfall recorded at the Jan Mayen meteorological station supports this suggestion.

Applying the Passivhaus standard to a terraced house in a hot and humid tropical climate – Evaluation of comfort and energy performance

2020 ◽  
Vol 41 (3) ◽  
pp. 247-260
Author(s):  
Roy Candra Sigalingging ◽  
David Chow ◽  
Steve Sharples
Keyword(s):  
Relative Humidity ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Best Practice ◽  
Natural Ventilation ◽  
Tropical Climate ◽  
Energy Performance ◽  
Tropical Region ◽  
Humid Tropical Climate ◽  
Air Temperatures

In a hot and humid tropical climate, natural ventilation brings high levels of moisture into dwellings that, together with occupant activity, can result in very elevated internal relative humidity levels. Coupling these high relative humidities with high internal air temperatures creates occupant thermal discomfort, which is typically ameliorated in the tropics using energy-intensive air conditioning systems. This paper has investigated the potential benefits for thermal comfort and energy usage of applying the German Passivhaus standard to tropical dwellings. By creating a super insulated and air-tight envelope, the Passivhaus standard reduces fabric heat transfer, controls air infiltration and provides low-energy comfort. Applying this approach to a tropical terraced house might be effective but could, potentially, have an adverse impact on mechanical cooling demand. This study took an actual terraced property in Jakarta, Indonesia and thermally modelled its performance as insulation and airtightness levels were incrementally improved up to the Passivhaus standard. Field measurements in the dwelling of air temperature and relative humidity were used to validate the thermal model of the existing house. The validated model then tested the feasibility of meeting the Passivhaus energy standard for cooling in the modified tropical house. Simulation allowed the effects of air conditioning (AC) and dehumidifiers on thermal comfort and cooling loads to be investigated. The research develop the Passivhaus building model that had the floor insulation removed to let the ground floor act as a thermal sink and potentially provide radiant cooling. Analysis revealed that the building’s predicted air temperatures were affected in a beneficial way by having the Passivhaus without floor insulation. Practical application: Cooling in hot and humid tropical region is an energy-intensive approach. Design approaches that can bring comfort and save energy for the occupant are essential. The success of Passivhaus standard in mild climate might be transferable to bring comfort in tropical housing. Best practice can be developed by analysing the Passivhaus building performance in hot and humid tropical region.

scholarly journals Proxy-based 300-year High Arctic climate warming record from Svalbard

Polar Record ◽  
2019 ◽  
Vol 55 (3) ◽  
pp. 132-141 ◽  
Author(s):  
Tomi P. Luoto ◽  
Antti E. K. Ojala ◽  
Marek Zajaczkowski
Keyword(s):  
Climate Warming ◽  
Break Point ◽  
Warming Trend ◽  
High Arctic ◽  
Ice Age ◽  
Arctic Climate ◽  
Air Temperatures ◽  
Summer Temperatures ◽  
Meteorological Observations ◽  
Arctic Climate Change

AbstractWe used fossil Chironomidae assemblages and the transfer function approach to reconstruct summer air temperatures over the past 300 years from a High Arctic lake in Hornsund, Svalbard. Our aims were to compare reconstructed summer temperatures with observed (last 100 years) seasonal temperatures, to determine a potential climate warming break point in the temperature series and to assess the significance and rate of the climate warming trend at the study site. The reconstructed temperatures were consistent with a previous proxy record from Svalbard and showed good correlation with the meteorological observations from Bjørnøya and Longyearbyen. From the current palaeoclimate record, we found a significant climate warming threshold in the 1930s, after which the temperatures rapidly increased. We also found that the climate warming trend was strong and statistically significant. Compared with the reconstructed Little Ice Age temperatures in late eighteenth century cooling culmination, the present day summer temperatures are >4°C higher and the temperature increase since the 1930s has been 0.5°C per decade. These results highlight the exceptionally rapid recent warming of southern Svalbard and add invaluable information on the seasonality of High Arctic climate change and Arctic amplification.

Climatology of the relative humidity in the Carpathian Valley

2020 ◽  
Author(s):  
Anikó Cséplő ◽  
István Geresdi ◽  
Ákos Horváth
Keyword(s):  
Climate Change ◽  
Relative Humidity ◽  
Meteorological Station ◽  
Seasonal Trends ◽  
Annual Trend ◽  
Changing Climate ◽  
It Impacts

<p>The reports about the climate change mostly focus about the trend of the temperature or precipitation. However, the relative humidity is also an important characteristic of the atmosphere, e.g. it impacts both the cloud and fog formation. The trends of the relative humidity in the changing climate have been found to be rather uncertain.  In this research the climatological trend of the relative humidity in the Carpathian Valley was studied. Analysis of the long-term observed database from eight meteorological stations was used to present the annual and seasonal trends of the relative humidity. The annual trend was found to be between 2-3% in every meteorological station. The results show that the relative humidity has decreased every season but in autumn, when the trend of it has not been consistent. While the most significant decrease has been occurred during spring, the decrease was negligible during autumn.</p>

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