Publications

Srivastava, A; Saran, S (2017). Comprehensive study on AOD trends over the Indian subcontinent: a statistical approach. INTERNATIONAL JOURNAL OF REMOTE SENSING, 38(18), 5127-5149.

Abstract
Aerosol optical depth (AOD) trend analysis has been carried out using various statistical techniques over Indian sub-regions. AOD data acquired from Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Terra and Aqua satellites from January 2003 to December 2015 have been utilized in the present study. Mann-Kendall test, Spearman partial rank correlation (SPRC) test, Pearson test, t-test, linear regression analysis, and Sen's slope estimate are performed on 13 years of AOD data to observe the trend over different Indian sub-regions. AOD trend is found to be positive (0.0035-0.0154 per year) over different Indian sub- regions indicating the enhanced level of suspended particles over the Indian subcontinent. All six methods are evaluated for trend detection using both satellite data. Linear regression and Sen's slope test provide good estimate of slope values to observe the magnitude of AOD change per year. Mann-Kendall test, SPRC test, and Pearson test support the trends results obtained from linear regression and Sen's slope estimate. So, these tests are preferable for the trend analyses.

DOI:
10.1080/01431161.2017.1323284

ISSN:
0143-1161