Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1029/2020GL089823
Licence creative commons licence
Title (Primary) Northward propagation of the Inter Tropical Convergence Zone and strengthening of Indian summer monsoon rainfall
Author Hari, V.; Villarini, G.; Karmakar, S.; Wilcox, L.J.; Collins, M.
Source Titel Geophysical Research Letters
Year 2020
Department CHS
Volume 47
Issue 23
Page From e2020GL089823
Language englisch
Supplements https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2020GL089823&file=grl61598-sup-0001-2020GL089823-S01.docx
Abstract Since 2002, there has been a clear increase in Indian summer monsoon rainfall (ISMR). We demonstrate that this increase is associated with a change in the dynamics of the Intertropical Convergence Zone (ITCZ). Using a recently‐released reanalysis product from 1980‐2016, we show that the ITCZ has strengthened and propagated northward since 2002. Analysis of the total energy‐budget reveals an increase in energy divergence and atmospheric diabatic heating, which is consistent with the changes in the ITCZ. Although global aerosol optical depth shows a significant positive trend during 1980‐2016, it has declined over many parts of India since 2002. We put forward the hypothesis that this is the driver of the changing characteristics of the ITCZ. Our results suggest that changes in the dynamics of the ITCZ, together with changes in the energy/moisture‐budget, are responsible for the strengthening of ISMR since 2002, consistent with the emergence of a greenhouse‐gas induced signal.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23927
Hari, V., Villarini, G., Karmakar, S., Wilcox, L.J., Collins, M. (2020):
Northward propagation of the Inter Tropical Convergence Zone and strengthening of Indian summer monsoon rainfall
Geophys. Res. Lett. 47 (23), e2020GL089823 10.1029/2020GL089823