Weakening of the interannual relationship between the winter Arctic Oscillation and eastern African precipitation in the late 1970s

Author:

Shi Yiwen1ORCID,Gong Daoyi234,Hua Wei156ORCID,Chen Yi234,Li Xinhua7

Affiliation:

1. School of Atmospheric Science Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province Sichuan Meteorological Disaster Prediction and Early Warning Engineering Laboratory Chengdu University of Information Technology Chengdu Sichuan Province China

2. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education Beijing Normal University Beijing China

3. Faculty of Geographical Science, Academy of Disaster Reduction and Emergency Management Ministry of Education/Ministry of Civil Affairs Beijing China

4. State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing China

5. Nansen‐Zhu International Research Centre, Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

6. Wenjiang National Climatology Observatory China Meteorological Administration Chengdu Sichuan Province China

7. Heilongjiang Province Meteorological Service Center Heilongjiang Province Meteorological Bureau Harbin Heilongjiang Province China

Abstract

AbstractIn this study, we investigate the changing relationship between the boreal winter Arctic Oscillation (AO) and eastern African precipitation. The results show that the negative correlation has significantly weakened since the late 1970s. And the Arabian anticyclonic circulation changed concurrently with the AO. In the mid‐high troposphere, the anomalous anticyclone centred over the Arabian Peninsula in 1980–2020 moved northeastward and weakened compared to 1950–1979. Correspondingly, the anomalous downward motion over eastern Africa significantly weakened compared with that in 1950–1979, corresponding to insignificant precipitation. A further analysis suggests that AO‐related Rossby wave trains in the upper troposphere may modulate the Arabian anticyclone. From 1950 to 1979, the wave activity preferred propagating eastward from the Mediterranean to Russia along a high‐latitude path. In contrast, during 1980–2020, it tended to emanate southeastward towards Saudi Arabia, with a notably stronger and more eastward extension than in the earlier period.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

Wiley

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