scholarly journals INTERDEPENDENCE BETWEEN DRY DAYS AND TEMPERATURE OF SYLHET REGION: CORRELATION ANALYSIS

2017 ◽  
Vol 10 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Syed Mustakim Ali Shah ◽  
G. M. Jahid Hasan
Keyword(s):  
Global Warming ◽  
Weather Conditions ◽  
Maximum Temperature ◽  
Trend Test ◽  
Positive Trend ◽  
The North ◽  
Hilly Region ◽  
North Eastern ◽  
Research Challenge ◽  
Sylhet Region

Climate change can have profound impact on weather conditions around the world such as heavy rainfall, drought, global warming and so on. Understanding and predicting these natural variations is now a key research challenge for disaster-prone country like Bangladesh. This study focuses on the north eastern part of Bangladesh which is a hilly region, plays an important role in the ecological balance of the country along with socio-economic development. Present study analyses the behavior of maximum temperature and dry days using different statistical tools. Pearson’s correlation matrix and Man-Kendall’s tau are used to correlate monthly dry days with monthly maximum temperature, and also their annual trend. A moderate correlation was found mostly in dry summer months. In addition, a positive trend was observed in Man Kendall’s trend test of yearly temperature which might be an indication of global warming in this region.

scholarly journals INTERDEPENDENCE BETWEEN DRY DAYS AND TEMPERATURE OF SYLHET REGION: CORRELATION ANALYSIS

2017 ◽  
Vol 10 (2) ◽  
pp. 145-154
Author(s):  
Syed Mustakim Ali Shah ◽  
G. M. Jahid Hasan
Keyword(s):  
Global Warming ◽  
Weather Conditions ◽  
Maximum Temperature ◽  
Trend Test ◽  
Positive Trend ◽  
The North ◽  
Hilly Region ◽  
North Eastern ◽  
Research Challenge ◽  
Sylhet Region

Climate change can have profound impact on weather conditions around the world such as heavy rainfall, drought, global warming and so on. Understanding and predicting these natural variations is now a key research challenge for disaster-prone country like Bangladesh. This study focuses on the north eastern part of Bangladesh which is a hilly region, plays an important role in the ecological balance of the country along with socio-economic development. Present study analyses the behavior of maximum temperature and dry days using different statistical tools. Pearson’s correlation matrix and Man-Kendall’s tau are used to correlate monthly dry days with monthly maximum temperature, and also their annual trend. A moderate correlation was found mostly in dry summer months. In addition, a positive trend was observed in Man Kendall’s trend test of yearly temperature which might be an indication of global warming in this region.

scholarly journals Temporal Trend Analysis of Historical Climatic Data at Northeastern Hilly Region of Bangladesh Using Mann-Kendall Test

2020 ◽  
Vol 11 (2) ◽  
pp. 19-25
Author(s):  
KK Mondal ◽  
Md AE Akhter ◽  
MAK Mallik
Keyword(s):  
Temporal Trend ◽  
Monsoon Season ◽  
Kendall Test ◽  
Climatic Data ◽  
Total Rainfall ◽  
The North ◽  
Positive Tendency ◽  
Hilly Region ◽  
North Eastern ◽  
Mann Kendall Test

An attempt has been implemented to find out the temporal trend of climatic data of average temperature and total rainfall for the study period 1980-2016 at North-Eastern Hilly Region in Bangladesh. The non-parametric Mann-Kendall test is used to analyze the trend of climatic data. The objective of the study is to investigate the trend variation in the North-Eastern hilly region. Results show that in monsoon season, both Sylhet and Srimangal meteorological stations experience a positive tendency with a rate of 0.037 and 0.0170C/year, respectively which are statistically significant at 99.9% level of significance. Monthly significant positive changes are found in all months except November, December and January for Sylhet while Srimangal indicates significant positive changes except July, September, October and November. The total rainfall at both the stations reveals decreasing trend during maximum seasons and months but the trend is not significant. Journal of Engineering Science 11(2), 2020, 19-25

scholarly journals Comparison of ocean datasets by their ability to adequately reproduce winter anomalies in the characteristics of the upper layer ot the north–eastern part of the North Atlantic

2021 ◽  
pp. 137-146
Author(s):  
A.B. Polonsky ◽  
◽  
P.A. Sukhonos ◽  
Keyword(s):  
North Atlantic ◽  
Temperature Anomaly ◽  
Negative Temperature ◽  
Weather Conditions ◽  
Winter Period ◽  
Data Sets ◽  
Ocean Temperature ◽  
The North ◽  
North Eastern ◽  
Upper Mixed Layer

This article analyzes the reproducibility of the reemergence of temperature and upper mixed layer (UML) depth anomalies in the northeastern North Atlantic during severe weather conditions observed in the Atlantic-European region in the winter of 2009/2010 and 2010/2011. The data of re-analyzes ORA-S3, GFDL, GODAS, GLORYS2v4 and objective analyzes Ishii, EN4.1.1 are used. It is confirmed that the formation of the negative temperature anomaly in UML in winter 2010/2011 is largely due to the reemergence of the ocean temperature anomaly that occurred in the winter of 2009/2010. Interannual UML depth anomalies in the northeastern North Atlantic from the ORA-S3 and GODAS reanalysis datasets from March 2009 to November 2011 are in satisfactory agreement. The best description of the evolution of temperature anomalies in the 10–550 m layer in 2010, in accordance with the hypothesis of the reemergence of the ocean temperature anomaly, was obtained for the UML depth from the indicated data sets. An assessment of the statistical features of the case of the reemergence of anomalies in the UML characteristics at a significant level showed the occurrence of the UML depth anomaly in the winter of 2010/2011, formed in the last autumn-winter period. Moreover, such specific conditions could not have formed in the early 2000s.

PCR identification of five species from the Anopheles maculipennis complex (Diptera: Culicidae) in North-Eastern Romania

2015 ◽  
Vol 60 (2) ◽  
Author(s):  
Maria-Larisa Ivanescu ◽  
Dumitru Acatrinei ◽  
Ionuţ Pavel ◽  
Tatiana Sulesco ◽  
Liviu Miron
Keyword(s):  
Global Warming ◽  
Ribosomal Dna ◽  
Its2 Sequence ◽  
Climatic Conditions ◽  
Eastern Area ◽  
The North ◽  
Anopheles Maculipennis Complex ◽  
Anopheles Maculipennis ◽  
North Eastern ◽  
Maculipennis Complex

AbstractThe members of the Anopheles maculipennis complex have been incriminated for the transmission of the malaria in Europe, which was endemic until the middle of the century. The global warming and the intensification of the intercontinental travel constitute a risk of the re-emergence of the malaria in Europe, given the presence of the Anopheles vectors. The study has attempted the identification by using the PCR (Polymerase Chain Reaction) of the members of the Anopheles maculipennis complex from the North-eastern area of Romania from the city of Iaşi. In total there have been identified by using the PCR amplifying the ITS2 sequence of the ribosomal DNA, 217 specimens belonging to the complex of A. maculipennis among which: 58 A. atroparvus, 18 A. melanoon, 2 A. labranchiae, 52 A. maculipennis and 87 A. messeae. The ITS2 sequences of the ribosomal DNA have been compared to those of the species belonging to the A. maculipennis available in GenBank. The Species A. labranchiae is reported for the first time in Romania, being identified in the larval stage IV. The adaptation of a new species to the climatic conditions present in the North-eastern Romania, confirms the phenomenon of global warming and also the intensification of the travelling. As a result of the analysis of the A. labranchiae sequence, this one corresponds to the extent of 96% to the species from Italy, registered in GenBank, given the fact that a high number of the inhabitants of the municipality of Iaşi are working in this country.

scholarly journals Trends in Extreme Climate Indices in Cherrapunji for the period 1979 to 2020

2021 ◽  
Author(s):  
Raju Kalita ◽  
Dipangkar Kalita ◽  
Atul Saxena
Keyword(s):  
Climate Change ◽  
Negative Trend ◽  
Maximum Temperature ◽  
Daily Minimum Temperature ◽  
Daily Maximum Temperature ◽  
Trend Test ◽  
Climate Indices ◽  
Daily Maximum ◽  
Positive Trend ◽  
Extreme Climate

Abstract We have used Mann-Kendall trend test and Sen’s slope estimator method to find out significant changes in extreme climate indices for daily temperature as well as precipitation over the period 1979 to 2020 in Cherrapunji. In the present study, a total of 24 precipitation and temperature based extreme climate indices were calculated using RClimDex v 1.9-3. Among 24 indices, 7 were derived from number of days above nn mm rainfall (Rnn) according to Indian Meteorological Department (IMD) convention and the rest were in accordance with the Expert Team on Climate Change Detection and Indices (ETCCDI). It was observed that, among all the indices, consecutive dry days (CDD), summer days (SU25) and very light rainfall (VLR) days increased significantly with 0.54, 1.58 and 0.14 days/year respectively, while only consecutive wet days (CWD) decreased significantly with 0.36 days/year. A slight negative trend was also observed in case of tropical nights (TR20) and among the other precipitation indices as well. Again, the indices associated with daily maximum temperature increased significantly with annual change of 0.06 to 0.07 ⁰C/year. And for indices associated with daily minimum temperature, almost no change or a slight negative change was observed, except a significant positive trend in February and significant negative trend in November for TNN only. The analysis reveals that some of the extreme climate indices which explains the climatic conditions of Cherrapunji has changed a lot over the period of 42 years and if this trend continues then Cherrapunji will be under threat when it comes to climate change.

scholarly journals Pear rust in the conditions of north-eastern Forest-Steppe of Ukraine

2019 ◽  
pp. 53-58
Author(s):  
V.I. Tatarynova ◽  
O.G. Zhatov ◽  
V.I. Trotsenko ◽  
A.O. Burdulanyuk ◽  
T.O. Rozhkova ◽  
...  
Keyword(s):  
Life Cycle ◽  
Weather Conditions ◽  
Forest Steppe ◽  
The North ◽  
North Eastern ◽  
Different Types ◽  
Pear Trees ◽  
Fruit Orchards ◽  
Almost All ◽  
Gymnosporangium Sabinae

Studies were conducted during 2017‒2019 based on the training laboratory of horticulture and viticulture of the Sumy National Agrarian University in the conditions of the North-Eastern Forest-Steppe of Ukraine. It was found that the pear was massively affected by rust. This is a fungal disease that was rarely found in fruit orchards of the North-Eastern Forest-Steppe of Ukraine. Rust infected pear trees very rarely in previous years. Only single spots were found on the leaves of the pear. Since 2015, the development of the disease has noticeably accelerated from year to year. There was a massive rust damage of the pear in the region in 2019. The prevalence of the disease reached 100 % in almost all varieties. Mostly the leaves were affected, not to a large extent the shoots of the pear. On the fruits of the external signs of the disease were not detected. During the years of research, weather conditions were optimal for the spread of fungal diseases. Only the aecial stage of the fungus was observed on the pear.  The aecial stage of the pathogen is the most harmful. Affected pear leaves fall prematurely. Studies were conducted on pear varieties Lymonka, Petrovska, Medova, Osinnia Yakovlieva, Chyzhovska, Noiabrska, Bere Desiatova, Uliublenytsia Klappa, which showed different degrees of rust damage. The disease manifested itself most significantly (5 points) on the varieties, Uliublenytsia Klappa and Bere Desiatova. Not one of the varieties did not show high resistance to the pathogen. The pear of the Chyzhovska variety was less affected, with a defeat score of 3 (18.8 %) in 2017 and 4 (32.3 % and 44.1 %) in 2018‒2019. It is known that the life cycle of the rust pathogen Gymnosporangium sabinae (Dicks.) G. Winter occurs on two plants: pear and juniper. The pathogen from juniper goes on the pear and vice versa. Pear trees do not become infected from each other. On the territory adjacent to the fruit garden of Sumy National Agrarian University, a survey of plantings of different types of juniper was conducted. There were no visible signs of the disease on the juniper. At the same time, pear trees were highly infected with the pathogen. Perhaps the spores of the fungus can spread far through air currents. But at the same time, possible changes in the life cycle of the pathogen in the conditions of this region. Clarification of this circumstance requires deeper further research.

scholarly journals The Potential Of Geomatics In The Realization Of A Map Of Desertification Sensitivity Southern Massif Belezma - Batna - (Algeria)

2015 ◽  
Vol XL-7/W3 ◽  
pp. 751-756 ◽  
Author(s):  
H. Benmessaoud ◽  
F. Chergui ◽  
R. Sahnouni ◽  
C. Chafai
Keyword(s):  
Weather Conditions ◽  
The North ◽  
Sustained Reduction ◽  
Highly Sensitive ◽  
North Eastern ◽  
Human Reality ◽  
Restoration Work ◽  
North Eastern Part

Desertification is the gradual and sustained reduction in the quantity and quality of the biological productivity of arid and semi-arid land. <br><br> The study area is located in the North Eastern part of Algeria, it has a rich heritage in its biodiversity, however weather conditions and adverse human reality, induce a degradation of the physical environment in the form of a regression of vegetation cover. To assess desertification in our study area map of desertification sensitivity is a tool for decision support. <br><br> For the realization of this Map we used the ArcGis software applied a methodology which is inspired by the concept MEDALUS (Mediterranean Desertification and Land Use, 1999) by crossing four thematic layers that may have an impact on the process of desertification. <br><br> The results of Cartography and statistical analysis permit the classification of our region in terms of sensitivity to desertification in four very important classes. (Not affected, Insensitive, Sensitive and highly sensitive). <br><br> More than 69.92% of the surface area were classified sensitive to very sensitive, For against 30.07% is classified in unallocated insensitive. <br><br> Planning restoration work and the fight against desertification are expected to limit the risk of desertification in the study area perspectives.

scholarly journals Comparison of climatic variables among different climatic sub-regions of Bangladesh

2016 ◽  
Vol 29 (1) ◽  
pp. 63-71
Author(s):  
Md Younus Mia ◽  
Md Ramjan Ali ◽  
Shimul Roy
Keyword(s):  
Minimum Temperature ◽  
Moving Average ◽  
Maximum Temperature ◽  
Annual Average ◽  
Change Rate ◽  
The North ◽  
Eastern Zone ◽  
North Eastern ◽  
Western Zone ◽  
North Western

The study was conducted to compare the rate of change of selective climatic variables such as annual maximum and minimum temperature, annual total rainfall and annual average humidity among the three different climatic sub-regions (Western zone, northwestern zone and north-eastern zone) of Bangladesh. Annual averages of climatic parameters were calculated to analyze the trend lines, variation and change rate of climatic parameter during the study period. Five years moving average rainfall and humidity were also determined. It was observed that change rate of annual maximum temperature and annual average maximum temperature both were highest in north-eastern zone at the rate of 0.048 and 0.046°C per year, respectively. Highest annual minimum temperature change rate (0.003°C per year) was also found in the north-eastern zone but highest annual average minimum temperature change rate (0.034°C per year) was found in the north-western zone. Average annual rainfall was decreasing insignificantly in all the three climatic sub-regions whereas the highest change rate (21.50 mm per year) was observed in the north-eastern zone of Bangladesh. Highest annual average humidity change rate (0.113% per year) was found in the north-western zone of Bangladesh and five years moving average of annual average humidity was increasing at the highest rate of 0.132% per year in the north-western zone of Bangladesh.Bangladesh J. Sci. Res. 29(1): 63-71, June-2016

scholarly journals Global warming-related tree growth decline and mortality on the north-eastern Tibetan plateau

2015 ◽  
Vol 134 (1-2) ◽  
pp. 163-176 ◽  
Author(s):  
Eryuan Liang ◽  
Christoph Leuschner ◽  
Choimaa Dulamsuren ◽  
Bettina Wagner ◽  
Markus Hauck
Keyword(s):  
Global Warming ◽  
Tibetan Plateau ◽  
Tree Growth ◽  
Eastern Tibetan Plateau ◽  
The North ◽  
North Eastern ◽  
Growth Decline

scholarly journals Parasite prevalence increases with temperature in an avian metapopulation in northern Norway

Parasitology ◽  
2019 ◽  
Vol 146 (8) ◽  
pp. 1030-1035 ◽  
Author(s):  
H. Holand ◽  
H. Jensen ◽  
T. Kvalnes ◽  
J. Tufto ◽  
H. Pärn ◽  
...  
Keyword(s):  
Global Warming ◽  
Large Scale ◽  
Natural Populations ◽  
Weather Conditions ◽  
Parasite Prevalence ◽  
Winter Climate ◽  
Local Climate ◽  
Northern Norway ◽  
Mild Winter ◽  
The North

AbstractClimate and weather conditions may have substantial effects on the ecology of both parasites and hosts in natural populations. The strength and shape of the effects of weather on parasites and hosts are likely to change as global warming affects local climate. These changes may in turn alter fundamental elements of parasite–host dynamics. We explored the influence of temperature and precipitation on parasite prevalence in a metapopulation of avian hosts in northern Norway. We also investigated if annual change in parasite prevalence was related to winter climate, as described by the North Atlantic Oscillation (NAO). We found that parasite prevalence increased with temperature within-years and decreased slightly with increasing precipitation. We also found that a mild winter (positive winter NAO index) was associated with higher mean parasite prevalence the following year. Our results indicate that both local and large scale weather conditions may affect the proportion of hosts that become infected by parasites in natural populations. Understanding the effect of climate and weather on parasite–host relationships in natural populations is vital in order to predict the full consequence of global warming.

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