01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-03-0312 |
| Title of Abstract | Air-sea interaction processes and mixed-layer Heat budget in the Arabian Sea during the northward Propagating summer Monsoon Intraseasonal Oscillation (MISO) |
| Authors | Karthika P S*, Girishkumar M S, Abhijith Raj, Ashin K, Sherin V R |
| Organisation | INCOIS |
| Address | Venkatkrishna Apartment Hyderabad, Telangana, India Pincode: 500090 E-mail: ps.karthika1997@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The northward propagating organized convective activity on 20⿿60-day timescale from the equatorial Indian Ocean (EIO) is a striking phenomenon during the Indian Summer Monsoon. This phenomenon is usually referred to as the summer monsoon intraseasonal oscillation (MISO), and it predominantly determines the active and suppressed spells of the Indian Summer Monsoon, with rainfall anomalies extending from the Arabian Sea to the western Pacific. However, the representation of MISO in the coupled models used for seasonal and extended-range prediction is still challenging. Hence, it is imperative to understand the factors that modulate them in different oceanic basins. In this study, we used a combination of in-situ, reanalysis, and field campaign data to understand the air-sea interaction processes and factors that modulate the sea surface temperature variability associated with MISO using mixed-layer heat budget analysis. It was found that net surface heat flux and vertical processes play a predominant role in determining sea surface temperature during the active phase of MISO. Conversely, the sea surface temperature state during the suppressed phase is predominantly controlled by net surface heat flux alone. In addition, the relative importance of diapycnal mixing to determine the sea surface temperature variability during the different phases of MISO is also quantified. |
| Are you part of IIOE-2 endorsed project | yes |
| Endorsed Project Number | IIOE2-EP54 |
| Keywords | Air-Sea Interaction, Monsoon Intraseasonal Oscillation |
| For Awards | no |