भारतीय उष्णदेशीय मौसम विज्ञान संस्थान
Indian Institute of Tropical Meteorology
पृथ्वी विज्ञान मंत्रालय, भारत सरकार का एक स्वायत्त संस्थान
An Autonomous Institute of the Ministry of Earth Sciences, Govt. of India
Scientist Profile
Dr. Ankur Srivastava
Designation
: Scientist D
Phone
: +91-(0)20-25904457
Fax
: +91-(0)20-25865142
Email ID
: ankur[at]tropmet[dot]res[dot]in
| Degree | University | Year | Stream |
|---|---|---|---|
| Ph.D. | Indian Institute of Technology, Bombay | 2022 | Climate Studies |
| Bachelor of Technology | Uttar Pradesh Technical University | 2012 | Electronics & Instrumentation |
Monsoons and their different modes of variability viz. synoptic, intra-seasonal and inter-annual
Monsoon teleconnections
Predictability
Coupled ocean-atmosphere modelling
Seasonal Prediction
| Award Name | Awarded By | Awarded For | Year |
|---|---|---|---|
| Travel Grant | WCRP-RiFS | Asia Climate Risk and Impact Strategic Workshop | 2025 |
| Travel Grant | CLIVAR and CMIP IPO | CLIVAR Climate Dynamics Panel 5th Annual Workshop | 2025 |
| Travel Grant | ESMO IPO | 39th Working Group on Numerical Experimentation Annual Meeting | 2025 |
| Travel Grant | CMIP IPO | AOGS 2024 | 2024 |
| Travel Grant | ESMO IPO | 39th Working Group on Numerical Experimentation Annual Meeting | 2024 |
| Gold Medal | SRMCEM, Lucknow | Best B.Tech. Project Award | 2012 |
| Certificate of Merit | Uttar Pradesh Technical University | Top 10 performer in the university | 2012 |
| Year | Designation | Institute |
|---|---|---|
| 2021-Present | Scientist D | Indian Institute of Tropical Meteorology, Pune |
| 2017-2020 | Scientist C | Indian Institute of Tropical Meteorology, Pune |
| 2014-2016 | Scientist B | Indian Institute of Tropical Meteorology, Pune |
| 2012-2013 | Trainee Scientist | Indian Institute of Tropical Meteorology, Pune |
Research Highlight
The multi-year negative Indian Ocean Dipole of 2021-2022
The years 2021 and 2022 witnessed negative Indian Ocean Dipole (nIOD) conditions, with the 2022 event being the strongest on record. The dipole mode index was negative since the summer of 2021 and remained negative until early winter 2022, an unprecedented duration of 19 months. This makes it the first such occurrence of a multi-year nIOD. It co-existed with a triple-dip La Niña event during 2020–2022. In this study, we explore the dynamics behind the occurrence of this multi-year nIOD event. The tropical Indian Ocean (TIO) witnessed predominant westerly wind anomalies starting in the summer of 2021 and lasting till the end of 2022, with a record number and duration of westerly wind bursts (WWBs). The anomalous westerlies were supported by the background La Niña state and anomalous convection over the eastern TIO associated with tropical intra-seasonal oscillations. Occurrences of WWBs outside their preferred climatological months and strong westerly wind anomalies modulated the intensity of the zonal currents and the Wyrtki jets in the TIO. The associated heat and mass transfer caused the depression of the thermocline in the eastern TIO, resulting in the sustenance of nIOD conditions. Anomalous westerly wind activity in the TIO during the spring of 2022 served as a bridge between the two nIOD events and sustained it for a record duration. This multi-year nIOD event thus prevented the Indian summer monsoon rainfall from being in large excess, as the monsoon conducive modulation of the Walker circulation was counteracted by the anomalous subsidence over India by the nIOD-modulated regional Hadley circulation.