ANALYSIS OF EXTREME TEMPERATURE EVENTS OVER CENTRAL INDIAN REGION USING SATELLITE DATA

摘要

An analysis of Extreme Temperature events (ETE) during the months of March, April, May was conducted over the Central Indian Region for the years 2003-2016 using remotely sensed AIRS level 3 version 6(1° x 1°) Air Temperature at surface data. A high positive correlation of 0.84 was found between the AIRS and ground based IMD gridded temperature data, supporting the use of AIRS data for the study. A histogram analysis, to identify the ETE was done, which showed that the HW can be considered when the Air temperature is higher than the 99th percentile of the Daily Mean Temperature (T_(dm)). To know about the frequency, duration and intensity of the ETE, a Heat Index (HI) was calculated using the difference between the T_(dm) and Long Term Mean (M_(lt)) i.e., the anomaly, and dividing it by the Standard Deviation of M_(lt). The M_(lt) of the study area showed a minor rise in temperature around end of March and beginning of April which indicated possibility of ETE. The anomaly along with the HI values and intensify from sensitivity analysis were studied yearly and the days which had a HI value above 0.3 and anomaly above 0.8 were considered as ETE for that year if the duration was of two or greater than two days. Though the study area was too big and the time period too small to conclude a trend, it was inferred that the extreme events are happening early i.e. in March for some years and increasing during May along with their duration. The number of ETE of duration more than 5 days was seen to be large as well. The spatial analysis of the study area helped to visualize the region that is more affected by ETE in Central India.