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Dynamics of upper tropospheric stationary wave anomalies induced by ENSO during the northern summer: A GCM study

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Abstract

Ensemble seasonal integrations are carried out with the COLA GCM, with a view to understand the dynamical connection between warm SST anomalies in the equatorial central-eastern Pacific Ocean and the upper level stationary wave anomalies seen during drought years over the Indian summer monsoon region. In addition, experiments with and without orography are performed in order to examine the role of the Himalayas in modulating the El Niño induced stationary wave anomalies over the summer monsoon region.

The GCM simulations show a statistically significant weakening of the summer monsoon activity over India in response to the SST forcing in the equatorial Pacific Ocean. This weakening of the summer monsoon appears to be largely related to modifications of the local Hadley and Walker cells over the summer monsoon region. In addition, it is seen that the anomalous ENSO divergent forcing over the tropical Pacific Ocean can act as a potential source for Rossby wave dispersion. Here one finds the possibility of meridionally propagating Rossby waves, which emanate from the ENSO forcing region, to interact with the subtropical westerlies and generate anomalous highs and lows in the subtropics and extratropics. The quasi-stationary perturbations seen over west Asia, Pakistan and northwest India during drought years, seem to be generated by the above mechanism. An alternate mechanism that could be important for the persistence of the quasi-stationary perturbations seems to be based on the dynamic excitation of middle latitude normal modes which can extract energy from the zonally varying unstable basic flow.

It is seen from the GCM simulations, that the Himalayan orography plays a crucial role in anchoring the El Niño induced extratropical westerly troughs far to the west in the high latitude belt. In the absence of orography it is seen that the ENSO induced extra-tropical cyclonic anomalies tend to intrude southward into the monsoon region thereby destroying the regional scale circulations completely. Another effect due to the Himalayas is to generate lee waves on the eastern side of the topographic barrier which encircle the globe in the subtropics and midlatitudes.

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Abbreviations

CLIM:

Climatology

COLA:

Center for Ocean Land Atmosphere Interactions

ENSO:

El Niño— Southern Oscillation

GCM:

General Circulation Model

GFDL:

Geophysical Fluid Dynamics Laboratory

IAV:

Interannual Variability

ISM:

Indian Summer Monsoon

ITCZ:

Inter Tropical Convergence Zone

JJAS:

June, July, August, September

MONEX:

Monsoon Experiment

NCAR:

National Center for Atmospheric Research

NCEP:

National Centers for Environmental Prediction

NMC:

National Meteorological Center

PNA:

Pacific North American

SO:

Southern Oscillation

SST:

Sea Surface Temperature

TEJ:

Tropical Easterly Jet

T30L18:

Triangular Trunctation at 30 Waves and 18 Vertical Levels

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  1. Climate and Global Modelling Division, Indian Institute of Tropical Meteorology, 411008, Pune, India

    R. Krishnan, C. Venkatesan & R. N. Keshavamurty

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Krishnan, R., Venkatesan, C. & Keshavamurty, R.N. Dynamics of upper tropospheric stationary wave anomalies induced by ENSO during the northern summer: A GCM study. Proc. Indian Acad. Sci. (Earth Planet Sci.) 107, 65–90 (1998). https://doi.org/10.1007/BF02842261

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