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Interannual Variability of summertime Outgoing Longwave Radiation over the Maritime Continent in Relation to east asian summer monsoon Anomalies

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Journal of Meteorological Research 2017年第4期31卷 665-677页

作者： Qi XU Zhaoyong GUAN Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science &Technology Nanjing 210044

The Maritime Continent（MC） is under influences of both the tropical Pacific and the Indian Ocean. Anomalous convective activities over the MC have significant impacts on the east asian summer monsoon（easm） and climate in China. In the present study, the variation in convective activity over the MC in boreal summer and its relationship to easm anomalies are investigated based on regression analysis of NCEP–NCAR reanalysis and CMAP [Climate Prediction Center（CPC） Merged Analysis of Precipitation] data, with a focus on the impacts of ENSO and the Indian Ocean Dipole（IOD）. The most significant interannual variability of convective activity is found over 10°S–10°N, 95°–145°E, which can be roughly defined as the key area of the MC（hereafter, KMC）. Outgoing longwave radiation anomaly（OLRA） exhibits 3- to 7-yr periodicities over the KMC, and around 70% of the OLRA variance can be explained by the ENSO signal. However, distinct convection and precipitation anomalies still exist over this region after the ENSO and IOD signals are removed. Abnormally low precipitation always corresponds to positive OLRA over the KMC when negative diabatic heating anomalies and anomalous cooling of the atmospheric column lead to abnormal descending motion over this region. Correspondingly, abnormal divergence occurs in the lower troposphere while convergence occurs in the upper troposphere, triggering an east Asia–Pacific/Pacific–Japan（EAP/PJ）-like anomalous wave train that propagates northeastward and leads to a significant positive precipitation anomaly from the Yangtze River valley in China to the islands of Japan. This EAP/PJ-like wave pattern becomes even clearer after the removal of the ENSO signal and the combined effects of ENSO and IOD, suggesting that convective anomalies over the KMC have an important impact on easm anomalies. The above results provide important clues for the prediction of easm anomalies and associated summer precipitation anomalies in China.

关键词： Maritime Continent convective activity ENSO Indian Ocean Dipole （IOD） east asian summer monsoon （easm）

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Temporal Variations of the Spring Persistent Rains and South China Sea Sub-high and Their Correlations to the Circulation and Precipitation of the east asian summer monsoon

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Acta meteorologica Sinica 2008年第4期22卷 530-537页

作者：万日金王同美吴国雄 Shanghai Typhoon Institute of the China Meteoroloyical Administration Department of Atmospheric Sciences Zhongshan University Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics

National Meteorological Information Center （NMIC） rainfall data and NCEP/NCAR daily circulation reanalysis data are employed to establish the onset-pentad time index of the spring persistent rains （SPR） and the decay-pentad time index of the South China Sea （SCS） sub-high. These indexes are used to study the relationship between the factors in SPR period and their relations to the circulation and precipitation of the east asian summer monsoon （easm）. Results show that, the summer rainfall over southeastern China decreases when SPR onset is late. For then easm strengthens and the cyclonic circulation around the Tibetan Plateau （TP） strengthens, which makes abnormal anti-cyclonic circulation （cyclonic convergent circulation weakens） appear over southeastern China. When the decay of SCS sub-high delays, abnormal flood prevails over the middle and lower reaches of the Yangtze River （MLYR） and to the south. That is mainly caused by easm weakening while SCS sub-high strengthening, then the abnormal southwesterly over South China and the abnormal northerlies of anti-cyclonic circulation around the TP converge over the Yangtze Valley. The two indexes have high correlations with multivariate ENSO index （MEI） in March, indicating that the climate abnormity in east Asia is related to global climate abnormity tightly. The two time indexes are independent of each other, which is favorable for the prediction of the anomalies of the circulation and precipitation of easm. From this point of view, we must take the global climate background into account when we analyze and predict the east asian summer circulation and precipitation.

关键词： spring persistent rains （SPR） east asian summer monsoon （easm） the South China Sea （SCS） sub-high correlation analysis time indices

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