Positive response of Indian summer rainfall to Middle East dust
Article first published online: 2 JUN 2014
©2014. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 41, Issue 11, pages 4068–4074, 16 June 2014
How to Cite
2014), Positive response of Indian summer rainfall to Middle East dust, Geophys. Res. Lett., 41, 4068–4074, doi:10.1002/2014GL059980., , and (
- Issue published online: 1 JUL 2014
- Article first published online: 2 JUN 2014
- Accepted manuscript online: 21 MAY 2014 11:37AM EST
- Manuscript Accepted: 19 MAY 2014
- Manuscript Revised: 8 MAY 2014
- Manuscript Received: 21 MAR 2014
- dust aerosols;
- Indian monsoon;
Using observational and reanalyses data, we investigated the impact of dust aerosols over the Middle East and the Arabian Sea (AS) on the Indian summer monsoon (ISM) rainfall. Satellite and aerosol reanalysis data show extremely heavy aerosol loading, mainly mineral dust, over the Middle East and AS during the ISM season. Multivariate empirical orthogonal function analyses suggest an aerosol-monsoon connection. This connection may be attributed to dust-induced atmospheric heating centered over the Iranian Plateau (IP), which enhances the meridional thermal contrast and strengthens the ISM circulation and rainfall. The enhanced circulation further transports more dust to the AS and IP, heating the atmosphere (positive feedback). The aerosols over the AS and the Arabian Peninsula have a significant correlation with rainfall over central and eastern India about 2 weeks later. This finding highlights the nonlocal radiative effect of dust on the ISM circulation and rainfall and may improve ISM rainfall forecasts.