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Formation and maintenance of monsoon inversion over the Arabian Sea

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Abstract

Monsoon Inversion (MI) plays a key role and is one of the semi-permanent features of Asian Summer Monsoon. MI is defined as a sustained temperature inversion (TI) that is observed in the lower troposphere, during summer monsoon (June to September) over the Western AS (WAS) with its peak between July and August. A comprehensive analysis of formation, evolution, and dissipation of MI is made using long-term observations from satellites and ERA-5 reanalysis of 15 years (2008–2022). The climatological day-to-day and monthly variations of MI over the Arabian Sea are studied. The occurrence of inversion (TI) during pre-monsoon, i.e., during April and May, is at a lower altitude and is strengthened by subsidence. The MI is found to occur strongly over the WAS, while it is seen occasionally with lesser strength over the Eastern Arabian Sea (EAS) during July–August. The advection is nearly five times stronger than subsidence. The reasons for the existence and strength of MI are investigated using the data of dust from the CALIPSO. There is a ~ 15% difference in the occurrence of dust over WAS compared to EAS. Also, MI occurrence has shown significant differences in temperature profiles during dust and non-dust cases. The analysis of MI reveals that strong MI is due to more advection of warm dry and dust laden air from desert regions (west, north and northwest directions). The present study has significance to the understanding of interannual monsoon variability.

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Abbreviations

AGL:

Above ground level

ARL:

Air Resources Laboratory

AS:

Arabian Sea

ASM:

Asian Summer Monsoon

ARMEX:

Arabian Sea Monsoon Experiment

CALIPSO:

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation

CC:

Clear Continental

CM:

Continental Marine

C3S:

Copernicus Climate Change Service

DT:

Dust

DAOD:

Dust aerosol optical depth

DM:

Dusty Marine

EAS:

Eastern Arabian Sea

ECMWF:

European Centre for Medium-Range Weather Forecasts

ESA:

European Space Agency’s

FGGE:

First GARP Global Experiment

HYSPLIT:

Hybrid SingleParticle Lagrangian Integrated Trajectory

IASI:

Infrared Atmospheric Sounding Interferometer

ISM:

Indian Summer Monsoon

IIOE:

International Indian Ocean Expedition

ITCZ:

Inter-Tropical Convergence Zone

MONEX:

Monsoon Experiment

MI:

Monsoon Inversion

NCMWRF:

National Centre for Medium Range Weather Forecasting

PC:

Polluted Continental

PD:

Polluted Dust

SBDART:

Santa Barbara Discrete Ordinate Atmospheric Radiative Transfer

SM:

Smoke

SST:

Sea surface temperature

TI:

Temperature inversion

VFM:

Vertical Feature Mask

WAS:

Western Arabian Sea

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Acknowledgements

The first author (Sanjeev Dwivedi) is thankful to Science and Engineering Research Board (SERB), Department of Science & Technology (DST), Government of India, for providing a National Post-Doctoral Fellowship (PDF/2016/003854) at National Atmospheric Research Laboratory (NARL), Gadanki, IIT Bhubaneswar, for providing the facility and a Post-Doctoral Fellowship to carry out this work. The author is also thankful to Meteorological Centre, Bhubaneswar, for providing necessary support. The authors gratefully acknowledge the ARL for HYSPLIT, NOAA, and ECMWF and NCEP for providing model, satellite (IASI), and CALIPSO and reanalyzed data sets used in this study. We wish to thank T.V. Lakshmi Kumar, Kiranamayi Landu, Harish Gadhvi, K. Venkatesh, S. T. Akhil Raj, A. Aravindhavel, and K. Aruna for active discussions in the data analysis.

Funding

The first author is thankful to Science and Engineering Research Board (SERB), Department of Science & Technology (DST), Government of India, for providing a National Post-Doctoral Fellowship via grant number PDF/2016/003854.

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Authors and Affiliations

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Contributions

M. S. Narayanan conceived the idea and supervision. S. Dwivedi carried out analysis, methodology and conceptualization, and writing the original manuscript with subsequent input from all co-authors. A. Pandit compiled the dust analysis. Buddhi Prakash Jangid carried out SBDART analysis. D. Narayana Rao, V. Sathiyamoorthy, M. V. Ratnam, V. Yesubabu, and V. Vinoj are responsible for the discussion and supervision.

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Correspondence to Sanjeev Dwivedi.

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Dwivedi, S., Pandit, A.K., Jangid, B.P. et al. Formation and maintenance of monsoon inversion over the Arabian Sea. Theor Appl Climatol 155, 2841–2856 (2024). https://doi.org/10.1007/s00704-023-04785-7

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  • DOI: https://doi.org/10.1007/s00704-023-04785-7

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