📋 Tender Overview
Indian Scientists have found a promising technique for early detection of development or strengthening of tropical cyclones in the atmospheric column prior to satellite detection over ocean surface in North Indian Ocean region.Early detection of Tropical cyclones has wide socio-economic implications. So far remote sensing techniques have detected them the earliest. However this detection was possible only after system developed as a well-marked low-pressure system over the warm ocean surface. A larger time gap between the detection and the impact of the cyclone could help preparation activities.Prior to the formation of cyclonic system over the warm oceanic environment the initial atmospheric instability mechanism as well as the vortex development is triggered at higher atmospheric levels. These cyclonic eddies are prominent features in the vertical atmospheric column encompassing the disturbance environment with a potential to induce and develop into a well-marked cyclonic depression over the warm ocean surface. They could be used for detection of prediction of cyclonesA team of Scientists including Jiya Albert Bishnupriya Sahoo and Prasad K. Bhaskaran from IIT Kharagpur with support from the Department of Science Technology Government of India under the Climate Change Programme CCP devised a novel method using Eddy detection technique to investigate the formative stages and advance detection time of tropical cyclogenesis in the North Indian Ocean region. The research was published in the journal Atmospheric Research recently.The method developed by the scientists aims to identify initial traces of pre-cyclonic eddy vortices in the atmospheric column and track its Spatio-temporal evolution. They used coarser grid resolution of 27 km for identification and finer resolution of 9 km to evaluate the characteristics of eddy vortices. The study was conducted with cases of four post-monsoon severe cyclones Phailin 2013 Vardah 2013 Gaja 2018 Madi 2013 and two pre-monsoon cyclones Mora 2017 and Aila 2009 that developed over North Indian Ocean.The team observed that the method could bring about genesis of prediction with a minimum of four days 90 h lead time for cyclones developed during the pre-and post-monsoon seasons. Initiation mechanisms of genesis of tropical cyclones occurs at upper atmospheric levels and are also detected at higher lead time for pre-monsoon cases unlike the post-monsoon cases. The study made a comprehensive investigation on the behavior of eddies in an atmospheric column for non-developing cases and compared these findings with developing cases.The technique was found to have potential for early detection of tropical cyclogenesis in the atmospheric column prior to satellite detection over ocean surface.
