Gabriel Lalchhandama

Malaria (P. falciparum, P. vivax) is a major vector borne disease in Mizoram. Since the extreme weather conditions and changing climate have a major role in the spread of vector borne illnesses, the purpose of this study aimed to examine the changing trend of climate and the relationship between climatic variables and epidemiological malaria situation in Mizoram. The Mann-Kendall and Sen's slope test were employed to analyze the changing trend on rainfall and humidity, the climatic data were collected from Indian Meteorological Department, Aizawl (1986-2019) and multiple regression model has been utilized to observe the correlation between instances of malaria and climatic factors (2000-2019). The data on epidemiological malaria cases were obtained from Health and Family Welfare Department, Govt. of Mizoram. The Mann-Kendall results show declining trend in rainfall with-4.58 magnitude of rainfall annually and an increase in the annual relative humidity with 0.19% (p <0.1). The regression model shows a highly significant association between the climatic variables and the malaria situation showing p<0.05.

The occurrence of anomalies in rainfall over an extensive period of time is a major hydro-meteorological event which may result into climate change and further may affect the hydrological imbalance and production of agricultural which are mainly dependent on rainfall. The study explores the annual and seasonal changing behavior of rainfall in Aizawl district of Mizoram for the period of 35 years from 1986-2020. Rainfall Anomaly Index (RAI) was employed to assess the dry and wet years in the rainfall pattern in the study area. The RAI shows an increasing number of dry and extremely dry years. Our findings also suggested that majority of the dry years in the study area were observed in recent decades.

Mountainous regions are considered highly vulnerable to the affects of climate change. The extent of change and variability of climatic parameters is still unexamined in many remote mountainous areas.  This paper aims in understanding the change in pattern of rainfall and temperature for a period of 30 years in Mizoram. The analysis of time series changing trend in climatic variables is carried out by using Coefficient of Variation (CV), Mann-Kendall (M-K) and Sen’s Slope estimator. The analysis reveals that high variation is observed for both the variables in all the decadal, three decadal and seasonal change. The CV analysis shows that the highest seasonal rainfall variation occurs during winter and the highest seasonal temperature variation occurs during spring. Mann-Kendall test shows a significant change in rainfall with November showing the highest negative trend of rainfall. The temperature trend analysis in the study also reveals drastic change of temperature. An understandi...

The study explores the annual and seasonal changing behavior of temperature and rainfall in Aizawl district of Mizoram for the period of 35 years from 1986-2020, the data were acquired from the Meteorological Department, Directorate of Science and Technology, Government of Mizoram. The non-parametric statistical tool of Mann-Kendall (M-K) and Sen's slope trend analysis and Rainfall Anomaly Index (RAI) was employed to assess the trend in the climatic variables and to assess the dry and wet years in the rainfall pattern in the study area. The result of the M-K trend analysis has shown a significantly increase trend in the annual max. temperature with Z value 2.88 showing an increase of .05ÚC/ yr. (p<0.01). the season of spring and winter also shows an increase in the max. temperature with Z value 3.25 (p<0.01) and 4.35 (p<0.001) respectively. The rainfall trend results reveal a negative trend in the annual rainfall with Z value-0.68 showing a decline of-0.34mm/yr.