The Indian easterly jet during the pre‐monsoon season in India

Croad, Hannah L.; Shonk, Jonathan K.P.; Chevuturi, Amulya ORCID:; Turner, Andrew G.; Hodges, Kevin I.. 2023 The Indian easterly jet during the pre‐monsoon season in India. Geophysical Research Letters, 50 (23), e2023GL105400. 10, pp.

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We identify for the first time an Indian Easterly Jet (IEJ) in the mid-troposphere during the pre-monsoon using reanalysis data. The IEJ is weaker and smaller than the African Easterly Jet over West Africa, with a climatological location of 10°N, 60–90°E, 700 hPa, and strength 6–7 m s−1 during March–May. The IEJ is a thermal wind associated with low-level meridional gradients in temperature (positive) and moisture (negative), resulting from equatorward moist convection and poleward dry convection. The IEJ is associated with a negative meridional potential vorticity gradient, therefore satisfying the Charney-Stern necessary condition for instability. However, no wave activity is detected, suggesting that the potential for combined barotropic-baroclinic instability is not often realized. IEJ strong (weak) years feature increased (reduced) near-surface temperatures and drier (wetter) conditions over India. This study provides an introduction to the IEJ's role in pre-monsoon dynamics, and a platform for further research.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Water Resources (Science Area 2017-)
ISSN: 0094-8276
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: jet, India, pre-monsoon, thermal wind, Indian Easterly Jet, IEJ
NORA Subject Terms: Hydrology
Date made live: 05 Dec 2023 11:51 +0 (UTC)

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