Structure of South Asia High in the stratosphere and influence of ENSO

LI Chong-yin; LI Lin; TAN Yan-ke

Abstract:

The structure of the South Asia High (SAH) in the stratosphere and the influence of ENSO on the SAH are systematically investigated with the long-term ECMWF reanalysis data. The results show that the SAH only exists in low levels of the stratosphere. The maximum intensity of the High is located at around 150 hPa and there is no obvious anti-cyclonic structure above 50 hPa. The axis of the SAH center tends to be northwest slanting from lower levels to higher levels. Further analyses show that the geopotential height and temperature fields of the SAH have dramatic anomalies during El Niño years and La Niña years. Corresponding to the ENSO, the SAH is weaker (stronger) at the warm (cold) phase.

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LI Chong-yin, LI Lin, TAN Yan-ke. Structure of South Asia High in the stratosphere and influence of ENSO [J]. Journal of Tropical Meteorology, 2011, 17(3): 293-301.

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Structure of South Asia High in the stratosphere and influence of ENSO

Institute of Meteorology, PLA University of Science & Technology

Abstract: The structure of the South Asia High (SAH) in the stratosphere and the influence of ENSO on the SAH are systematically investigated with the long-term ECMWF reanalysis data. The results show that the SAH only exists in low levels of the stratosphere. The maximum intensity of the High is located at around 150 hPa and there is no obvious anti-cyclonic structure above 50 hPa. The axis of the SAH center tends to be northwest slanting from lower levels to higher levels. Further analyses show that the geopotential height and temperature fields of the SAH have dramatic anomalies during El Niño years and La Niña years. Corresponding to the ENSO, the SAH is weaker (stronger) at the warm (cold) phase.

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Structure of South Asia High in the stratosphere and influence of ENSO

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