caa a22 4500 445299657 CHVBK 20180317142553.0 cr unu---uuuuu 170323e20100901xx s 000 0 eng 10.1007/s11430-010-4023-y doi (NATIONALLICENCE)springer-10.1007/s11430-010-4023-y Interhemispheric atmospheric mass oscillation and its relation to interannual variations of the Asian monsoon in boreal summer [Elektronische Daten] [ChuHan Lu, ZhaoYong Guan, JiaXi Cai] Using NCEP/NCAR reanalysis and precipitation records of Chinese stations, we have investigated the relationship of interhemispheric oscillation of air mass (IHO) with global lower-level circulation and monsoon anomalies in boreal summer. Our results show that the summer IHO explains a greater portion of variance in the abnormal distribution of atmospheric mass over 30°S-60°N as well as the Antarctic. The IHO strongly correlates to the variations of sea level pressure (SLP) in these regions. It is shown that IHO has some influences on both atmospheric mass transports and water vapor fluxes over 30°S-60°N in association with three anomalous cyclonic circulations over land areas of the eastern hemisphere, which is in close relation to the changes in summer monsoon intensity in eastern Asia and western Africa. Composites of summer rainfall anomalies in China for high and low IHO-index years indicate that the eastern Asian summer monsoon is more intense, with positive precipitation anomaly centers in northern and northeastern parts of China, as opposed to the negative center over the mid-lower reaches of the Yangtze River (MLRYR) in stronger IHO years. In weak IHO years, a feeble summer monsoon appears in eastern Asia, leading to positive center of precipitation anomalies displaced into the MLRYR. Furthermore, a teleconnection in wind fields between the western African and eastern Asian monsoon regions was observed in the middle and higher troposphere in the scenario of IHO. The anomalous cyclonic (anticyclonic) circulations along the path of this Africa-East Asia teleconnection were found to be just over the diabatic heating (cooling) centers, suggesting that diabatic forcings are responsible for the formation of this Africa-East Asia teleconnection. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 interhemispheric oscillation nationallicence Asian monsoon nationallicence precipitation nationallicence China nationallicence boreal summer nationallicence Lu ChuHan Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut Guan ZhaoYong Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut Cai JiaXi Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut Science China Earth Sciences SP Science China Press 53/9(2010-09-01), 1343-1350 1674-7313 53:9<1343 2010 53 11430 https://doi.org/10.1007/s11430-010-4023-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-4023-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu ChuHan Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut NATIONALLICENCE 700 1- Guan ZhaoYong Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut NATIONALLICENCE 700 1- Cai JiaXi Key Laboratory of Meteorological Disaster of Ministry of Education and College of Atmospheric Sciences, Nanjing University of Information Science & Technology, 210044, Nanjing, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/9(2010-09-01), 1343-1350 1674-7313 53:9<1343 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer