Indian scientists have found a promising technique for the early detection of the development or enhancement of tropical cyclones in the atmospheric column before satellite detection at the ocean surface in the northern Indian Ocean region.
Until now, remote sensing techniques have detected them the earliest. However, this detection was only possible after the system developed as a well-marked low pressure system on the warm ocean surface.
The study was conducted with cases of four severe post-monsoon cyclones — Phailin (2013), Vardah (2013), Gaja (2018), Madi (2013) and two pre-monsoon cyclones Mora (2017) and Aila (2009 ) which developed over the northern Indian Ocean region.
The early detection of tropical cyclones has broad socio-economic implications. A longer time interval between detection and impact of the cyclone could help preparedness activities.
Prior to the formation of a cyclonic system on the warm ocean environment, the initial mechanism of atmospheric instability, as well as the development of vortices, is triggered at higher atmospheric levels.
These cyclonic eddies are important features of the vertical atmospheric column encompassing the disturbing environment with the potential to induce and develop into a well-marked cyclonic depression on the warm ocean surface, the Department of Science and Technology said on Wednesday. of Technology.
A team of scientists including Jiya Albert, Bishnupriya Sahoo and Prasad K. Bhaskaran from IIT Kharagpur, with support from the Department of Science and Technology of the Government of India under the Climate Change Program (CCP), designed the new method using the detection of vortices. technique to study the stages of formation and the advanced detection time of tropical cyclogenesis in the northern Indian Ocean region.
The research was published in the journal Atmospheric research recently.
The method developed by scientists aims to identify the first traces of precyclonic vortices in the atmospheric column and to follow its spatio-temporal evolution. They used a coarser grid resolution of 27 km for identification and a finer resolution of 9 km to assess vortex characteristics.
“The team observed that the method could result in the genesis of the prediction with a minimum delay of four days (90 hours) for cyclones developed during the seasons before and after the monsoon,” the ministry said.
“The initiation mechanisms of tropical cyclone genesis occur at higher atmospheric levels and are also detected at a longer time frame for pre-monsoon cases, unlike post-monsoon cases.”
The study thoroughly investigated the behavior of vortices in an atmospheric column for non-developing cases and compared these results with developing cases.
The technique has been shown to have the potential for early detection of tropical cyclogenesis in the atmospheric column before satellite detection above the ocean surface.
The above article was published by a news agency with minimal title and text changes.