scholarly journals Historical and Temporal Trends of Climatic Parameters in North East India

2017 ◽  
Vol 19 (4) ◽  
pp. 547-561 ◽  
Keyword(s):  
Meteorological Data ◽  
Temporal Trends ◽  
Maximum Temperature ◽  
Local Climate ◽  
Water Resources Systems ◽  
North East India ◽  
North East ◽  
Mk Test ◽  
Ne India ◽  
Increasing Trends

Accessing temporal trend of different meteorological parameters is essential for understanding the local climate changing pattern of a region. Quantitative estimates of the effect of climate change helps in understanding, planning, and management of water resources systems. In this study, monthly meteorological data were collected from 30 stations of north-east (NE) India for 1971–2010 and non-parametric Mann-Kendall (MK) test and Sen slope were employed for detection and quantification of significant temporal trends, respectively. An ESRI ArcGIS toolbar “ArcTrends” was used for the above mentioned tasks. The results obtained for rainfall were of mixed nature and both increasing and decreasing significant trends were found for different stations in different months. Most of the negative trends were found in the months of July–August (monsoon), whereas, more stations showed positive trends in April–May (pre-monsoon), and October–November (post-monsoon), indicating inter-seasonal shifting of rainfall without much change in the annual total. Number of rainy days was found to have positive trends in March–May (pre-monsoon) and negative trends in September–December. Except some positive trends during June–December in Manipur and Meghalaya, there were no significant trends in maximum temperature. In some stations, minimum temperature was found to have significant increasing trends throughout the year indicating a general rising trend in NE India. Some major towns like Guwahati, Imphal, Agartala and Kailashshahar showed significant positive trends in mean temperature, mostly during June–December. Mean relative humidity was, in general, found to be significantly increasing, especially during February–March. In some stations, wind speed was found to have significant negative trends throughout the year, with Agartala being the most affected.

scholarly journals Analysis of rainfall and temperature trends of selected stations over North East India during last century

MAUSAM ◽  
2021 ◽  
Vol 65 (4) ◽  
pp. 497-508
Author(s):  
S.I. LASKAR ◽  
S.D. KOTAL ◽  
S.K.ROY BHOWMIK
Keyword(s):  
Monsoon Season ◽  
Maximum Temperature ◽  
Rainfall Time Series ◽  
North East India ◽  
Post Monsoon ◽  
North East ◽  
The North ◽  
Increasing Trend ◽  
Post Monsoon Season ◽  
Increasing Trends

In this study, the trends of seasonal maximum and minimum temperatures and rainfall time series were investigated for 9 selected stations in the north eastern India with the available data stretching between the years 1913-2012.During the period under study the minimum temperature has increasing trends in almost all the stations of north east India except Cherrapunji where it shows decreasing trend in all the season of the year. In case of maximum temperature Cherrapunji, Guwahati and Imphal show increasing trends during all the seasons. Agartala and Shillong show increasing trend of maximum temperature during monsoon and post monsoon season. Dibrugarh and Pasighat show decreasing trend during pre monsoon season and increasing trend during all other seasons of the year. Gangtok shows decreasing trend of maximum temperature during all the seasons where as Silchar shows no trend in maximum temperature.Out of all the selected nine stations, most of the stations show either decreasing trend or no trend of rainfall except Guwahati which shows significant increasing trend of rainfall during post monsoon season.

scholarly journals Trend Analysis of Long-Term Reference Evapotranspiration and Its Components over the Korean Peninsula

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1373 ◽  
Author(s):  
Mona Ghafouri-Azar ◽  
Deg-Hyo Bae ◽  
Shin-Uk Kang
Keyword(s):  
Solar Radiation ◽  
Korean Peninsula ◽  
Reference Evapotranspiration ◽  
Temporal Trends ◽  
Weather Data ◽  
Energy Term ◽  
The North ◽  
Dominant Component ◽  
Mk Test ◽  
Increasing Trends

In this study, the spatial and temporal trends of reference evapotranspiration (ETo) and its components consisting of the energy term (ENo) and the aerodynamic term (AEo) were considered over the Korean Peninsula. The T-test and Mann–Kendall (MK) test were used to detect parameter trends after removing the effect of serial correlation from annual and seasonal time series between 1980 and 2017. Due to the lack of solar-radiation data for North Korea (NK), a regionally calibrated model based on South Korea (SK) weather data was developed to estimate daily solar radiation in NK. The results showed that spatial distribution of the ETo increased southward in the range from 705 mm/year in the northeast to 1195 mm/year in the southeast of the Korean Peninsula. The spatial patterns of the ENo and AEo varied from the minimum in the north and increased southward, reaching their maximum values in the southern parts of the Korean Peninsula. The mean annual ETo values of SK and NK were also compared. Over the 37-year period, mean annual evapotranspiration in SK was approximately 18% higher than that in NK. Moreover, mean areal ENo and AEo in SK were higher than in NK. The trend of the ENo on annual and seasonal scales was also upward. In contrast, the trend of the AEo decreased over the Korean Peninsula through all seasons and annual scales. These opposite trends in the ENo and AEo parameters mitigated the significant trends of the ETo. Finally, the stronger significant upward trend of the energy term led to significant increasing trends of ETo on the Korean Peninsula, with ENo being the dominant component in the increase of the ETo.

scholarly journals Observed Trends and Variability of Temperature and Precipitation and Their Global Teleconnections in the Upper Indus Basin, Hindukush-Karakoram-Himalaya

Atmosphere ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 973
Author(s):  
Azfar Hussain ◽  
Jianhua Cao ◽  
Ishtiaq Hussain ◽  
Saira Begum ◽  
Mobeen Akhtar ◽  
...  
Keyword(s):  
Climate Change ◽  
Scientific Basis ◽  
Indus Basin ◽  
Spatiotemporal Variability ◽  
Maximum Temperature ◽  
Local Climate ◽  
Upper Indus Basin ◽  
Temperature And Precipitation ◽  
Increasing Trend ◽  
Increasing Trends

Having an extreme topography and heterogeneous climate, the Upper Indus Basin (UIB) is more likely to be affected by climate change and it is a crucial area for climatological studies. Based on the monthly minimum temperature (Tmin), maximum temperature (Tmax) and precipitation from nine meteorological stations, the spatiotemporal variability of temperature and precipitation were analyzed on monthly, seasonal, and annual scales. Results show a widespread significant increasing trend of 0.14 °C/decade for Tmax, but a significant decreasing trend of −0.08 °C/decade for Tmin annually, during 1955–2016 for the UIB. Seasonally, warming in Tmax is stronger in winter and spring, while the cooling in Tmin is greater in summer and autumn. Results of seasonal Tmax indicate increasing trends in winter, spring and autumn at rates of 0.38, 0.35 and 0.05 °C/decade, respectively, while decreasing in summer with −0.14 °C/decade. Moreover, seasonal Tmin results indicate increasing trends in winter and spring at rates of 0.09 and 0.08 °C/decade, respectively, while decreasing significantly in summer and autumn at rates of −0.21 and −0.22 °C/decade respectively for the whole the UIB. Precipitation exhibits an increasing trend of 2.74 mm/decade annually, while, increasing in winter, summer and autumn at rates of 1.18, 2.06 and 0.62 mm/decade respectively. The warming in Tmax and an increase in precipitation have been more distinct since the mid-1990s, while the cooling in Tmin is observed in the UIB since the mid-1980s. Warming in the middle and higher altitude (1500–2800 m and >2800 m) are much stronger, and the increase is more obvious in regions with elevation >2800 m. The wavelet analysis illustrated sporadic inter-annual covariance of seasonal Tmax, Tmin and precipitation with ENSO, NAO, IOD and PDO in the UIB. The periodicities were usually constant over short timescales and discontinuous over longer timescales. This study offers a better understanding of the local climate characteristics and provides a scientific basis for government policymakers.

scholarly journals Analysis of temperature variability and trends over Tripura

MAUSAM ◽  
2021 ◽  
Vol 68 (1) ◽  
pp. 149-160
Author(s):  
C. S. TOMAR ◽  
D. SAHA ◽  
S. DAS ◽  
SANJAY SHAW ◽  
SANJAY BIST ◽  
...  
Keyword(s):  
Diurnal Temperature Range ◽  
Winter Season ◽  
Temporal Variations ◽  
Temperature Data ◽  
Maximum Temperature ◽  
Mk Test ◽  
Four Seasons ◽  
Temperature Indices ◽  
Annual Scale ◽  
Increasing Trends

Attempts have been made to study the temporal variations and trends in monthly, seasonal and annual temperature over two stations - Agartala and Kailashahar in Tripura, India for the period 1969 to 2014. Analysis has been carried for four temperature indices, namely - minimum temperature (Tmin), maximum temperature (Tmax), mean temperature (Tmean) and diurnal temperature range (DTR). Non-parametric Mann-Kendall (MK) test was used to detect the trends and the magnitude of the trends were determined with Sen’s estimator of slope. The analysis of the temperature data revealed significant increasing trends in Tmin, Tmax and Tmean variables at both the stations on annual scale, while decreasing trend in DTR was significant over Agartala only. On the seasonal scale, the increasing (decreasing) trends were observed in Tmin, Tmax and Tmean (DTR) temperature indices in all the four seasons - winter, pre-monsoon, monsoon and post-monsoon except non-significant decreasing trend in Tmax in winter season over Agatala. On the monthly scale, significant rising trends in Tmin, Tmax and Tmean were observed in the most of the months and significant decreasing trend in DTR was found only in the months of January and December.  

scholarly journals THE MULTIDIMENSIONAL POVERTY IN THE NORTH EASTERN STATES OF INDIA

2020 ◽  
pp. 89-92
Author(s):  
Paranan Konwar
Keyword(s):  
Direct Method ◽  
Multidimensional Poverty ◽  
Multidimensional Poverty Index ◽  
North East India ◽  
North East ◽  
The North ◽  
Ne India ◽  
North Eastern ◽  
To Come ◽  
The Comparative Study

The Multidimensional Poverty Index (MPI) applies the direct method of measuring poverty using the Alkire and Foster (AF) approach. The study aims at analyzing the comparative study and trends of the multi-dimensional poverty among the north eastern states of India. The MPI value was continuing to be higher in Assam and Meghalaya over the decade (2005-06 to 2015-16). Vulnerability to poverty was estimated to be lower in Mizoram over the decade as compared to all India level. On the other hand, severity of poverty was higher in two states, Assam and Meghalaya as compared to the all India estimate (8.8%) between 2005-06 and 2015-16. In can be concluded Assam, a gateway to north east India, remains as multidimensionality poor as compared to all states of NE India. Vulnerability and severity of poverty are higher in Assam over the decades among the NE States. Thus, it is recommended for pro-poor strategy for Assam in health, education and standard of living to come out of multidimensional poverty. KEYWORDS: MPI, Assam, North East India, Vulnerability of poverty, severity of poverty

scholarly journals Comparative assessment of arbuscular mycoorhizal fungi (AMF) associated with Oroxylum indicum L. (Kurz.)- an ethno-medicinal plant of N. E. India

2016 ◽  
Vol 5 (10) ◽  
pp. 1436
Author(s):  
Aatreyee Nath ◽  
Liza Handique Bhattacharyya* ◽  
Pranaba Nanda Bhattacharyya ◽  
Vipin Parkash ◽  
Bijay Sharma
Keyword(s):  
Diversity Indices ◽  
North East India ◽  
Oroxylum Indicum ◽  
North East ◽  
Environmental Selection ◽  
Geographical Variations ◽  
Sampling Locations ◽  
Ne India ◽  
Spore Population ◽  
Fungal Associations

Oroxylum indicum L. (Kurz.) is an ethno-medicinally important plant of North East India. In the present investigation, a comparative study was conducted to assess the AM fungal associations of Oroxylum indicum (L.) Kurz. each at two sampling locations of Jorhat district, Assam and Mon district of Nagaland, N. E. India. Comparatively higher root colonization (100±0) and maximum spore population (1239±13.4) were observed in the rhizospheric samples of Mon district, Nagaland, the region which is geographically more distinct and diverse than the other study location. The rhizospheric samples of Jorhat district showed relatively lower spore count and AM colonization. The Shannon-Weinner and Simpson diversity indices were measured as maximum (2.935 and 0.941 respectively) in samples of Mon district, Nagaland. The results of the present investigation indicated the effect of geographical variations, environmental selection as well as alterations of edaphic factors in changing the AMF populations associated with Oroxylum indicum, an ethno-medicinally important plant of NE India.

scholarly journals Potential malaria vector Anopheles minimus (species A) still persisting in North East India

2020 ◽  
Author(s):  
Varun Tyagi ◽  
Diganta Goswami ◽  
Sunil Dhiman ◽  
Dipanjan Dey ◽  
Bipul Rabha ◽  
...  
Keyword(s):  
Malaria Vector ◽  
Sibling Species ◽  
Morphological Identification ◽  
Low Density ◽  
Pcr Assay ◽  
Anopheles Minimus ◽  
North East India ◽  
North East ◽  
Specific Pcr ◽  
Ne India

ABSTRACTBackgroundVector borne infectious diseases affect two third of the world’s human population and cause mortality in millions each year. Malaria remains one of the major killers in the Indian sub-continent and transmitted uninterruptedly by many efficient vectors and their sibling species. In North East India (NE), Anopheles minimus has been recognized as an important vector which shares majority of malaria cases. This study primarily focuses on to recognize the presence and distribution of sibling species of An. minimus in certain endemic area of NE India.MethodsAnopheles species were collected and identified using available morphological keys. The genomic DNA was extracted from the mosquito specimen and used to perform species specific PCR (ss PCR) for molecular identification of major malaria vector An. minimus sibling speciesResultMorphological identification suggested the presence of An. minimus sl in low density in the study area. The specimen of An. minimus subjected to ss PCR confirmed the prevalence of only one sibling species namely, An. minimus A in Sialmari and Chandubi.ConclusionThough in low density, but malaria vector An. minimus is still present in certain endemic areas of NE India. The ss PCR assay employed presently suggested that An. minimus sibling species A is prevailing in the region. Presently used ss PCR assay was simpler, faster, cheaper and more readily interpreted than earlier assays. This information could be useful in understanding of current prevalence and distribution of An. minimus sibling species complex in NE region of India.

scholarly journals Geochemical and biostratigraphic constraints on the genesis of mafic intrusive in the Buxa Dolomite (Neoproterozoic), Panging area of the Arunachal Lesser Himalaya, north east India

2010 ◽  
Vol 40 ◽  
pp. 1-12
Author(s):  
A. K. Gupta ◽  
A. K. Singh
Keyword(s):  
Lesser Himalaya ◽  
Mafic Rocks ◽  
North East India ◽  
Partial Melt ◽  
North East ◽  
Enriched Mantle ◽  
Tectonic Environment ◽  
Ne India ◽  
Late Neoproterozoic ◽  
Gabbroic Intrusion

Mafic intrusive within Neoproterozoic carbonates of Miri-Buxa Group in the Panging area of the Arunachal Lesser Himalaya, NE India has been reported for the first time. These mafic rocks have affinity to subalkaline-Mg-tholeiites and identified as low-Ti gabbro. Geochemically they are characterized by enrichment in LILE and LREE, depleted in HFSE with minor REE fractionated nature [(La/Yb)N = 2.70-3.29)] and positive Eu anomalies (Eu/Eu* = 1.00-1.30). These rocks have the influence of a within plate signature which were intruded in a continental rift tectonic environment. Petrogenetic modelings of [Mg]-[Fe] and REE suggest these mafic rocks probably derived from enriched mantle source similar to komatiitic composition at moderate to higher degree (35% - 50%) of partial melt. Based on the present reported microfossils viz. Rivularia haematites and Filamentus cyanobacteria in the chert lenses of the Buxa Dolomite from the Panging area, it is suggested that the gabbroic intrusion might have been taken place during Late Neoproterozoic which is probably close to the Precambrian–Cambrian boundary.

Bandh Syndrome and its Impact on Trade and Commerce in North-East India

2009 ◽  
Vol 5 (2) ◽  
pp. 91-101
Author(s):  
Komol Singha
Keyword(s):  
Economic Development ◽  
Human Resources ◽  
Law And Order ◽  
Asian Countries ◽  
Development Path ◽  
North East India ◽  
North East ◽  
The North ◽  
Ne India ◽  
Big Push

The North-East India (NEI) consists of eight states and it is a ‘mixed bag’ of several ethnic groups. The region is known for its unexploited natural and human resources which are the basic factors of economic development. So, the energetic entrepreneurs are necessary if we want to harness it properly. With the emergence of Globalization and more recently with the inception of ‘Look East Policy’, trade and commerce has become an important tool in linking this region with the Asian and South East Asian countries. Look-East Policy is expected to provide an opportunity to overcome the problem of distance from big markets. It is apparent that NE India as a whole needs a big push or a kick starts to launch the economy on the development path through trade and commerce. But, it is greatly handicapped by law and order situation or bandh and blockade in the region. Economic development of a region is quite illusive agenda without developing trade and commerce in the region. Peaceful environment in the region is the pre-requisite condition for economic development. Keeping this in mind, the question that arises is who will be the active agents in bringing peace in the region?

Development of the Rubber Sector in North East India: A Case of Missing Innovation and Linkages

2021 ◽  
pp. 097152312110023
Author(s):  
Indraneel Bhowmik ◽  
P. K. Viswanathan
Keyword(s):  
Import Substitution ◽  
Innovation System ◽  
Global Market ◽  
Sustainable Growth ◽  
System Model ◽  
System Framework ◽  
North East India ◽  
North East ◽  
Evolution And Development ◽  
Ne India

The development of the rubber sector in North East (NE) India in recent decades is an outcome of the government’s import substitution initiatives in the post-independence period. The article attempts to trace the process of evolution and development of the rubber sector in the region and observes that the adopted policies for rubber expansion had been framed under the narrow innovation system model, whereby the localised knowledge and learning, as well as practices, remained completely ignored in the promotion of the sector. The lack of region-specific rubber development strategies with appropriate linkages supported by institutional systems are the critical gaps that undermine the sustainable growth of the rubber sector in the NE region. Eventualities of the sort call for reinventing policies and programmes under the broad innovation system framework, so as to reap the advantages emanating from the integration of the region with the global market and facilitate greater diversification and sustainable growth of the rubber sector.

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