caa a22 4500 605474834 CHVBK 20210128100349.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00382-014-2425-9 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2425-9 A case study of the impact of boreal summer intraseasonal oscillations on Yangtze rainfall [Elektronische Daten] [Jianying Li, Jiangyu Mao, Guoxiong Wu] The impact on Yangtze rainfall of the boreal summer intraseasonal oscillations (BSISOs) over the entire Asian summer monsoon region during summer 1996 was investigated using the APHRODITE gridded rainfall and the NCEP-DOE reanalysis II products. Wavelet analyses suggest that the ISOs of Yangtze rainfall were regulated mainly by both 30-60- and 10-25-day oscillations, respectively linked to BSISO1 and BSISO2 activity. Phase locking of the wet phases of these two ISOs resulted in a prolonged wet episode from late June to mid-July. The circulation evolution of the BSISO1 mode showed that active convection accompanied by strong convergence of anomalous zonal winds first developed over the equatorial Indian Ocean, with suppressed convection over the South China Sea (SCS)-Philippine Sea and with active convection over the Yangtze Basin. The triple convection anomaly that aligned meridionally in the East Asian sector arose from a local meridional-vertical cell associated with a Rossby wave-like coupled circulation-convection system. The opposite flow patterns occurred during the dry phase of Yangtze rainfall. The composite BSISO2 cases demonstrated a weak convective anomaly initially appeared around the Maritime Continent, with a huge anomalous anticyclone accompanied by suppressed convection over the SCS-Philippine Sea. The low-level convergence of the anomalous southwesterlies on the northwestern side of the anticyclone and the consequent ascent led to positive rainfall anomalies over the Yangtze Basin. When the entire SCS was dominated by an anomalous cyclone resulting from interaction with upstream systems, convection over the Yangtze Basin was suppressed. Springer-Verlag Berlin Heidelberg, 2014 Boreal summer intraseasonal oscillations nationallicence Yangtze rainfall nationallicence Prolonged wet episode nationallicence Coupled circulation-convection system nationallicence Li Jianying State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut Mao Jiangyu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut Wu Guoxiong State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2683-2702 0930-7575 44:9-10<2683 2015 44 382 https://doi.org/10.1007/s00382-014-2425-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2425-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Jianying State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut NATIONALLICENCE 700 1- Mao Jiangyu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut NATIONALLICENCE 700 1- Wu Guoxiong State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, 100029, Beijing, China aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/9-10(2015-05-01), 2683-2702 0930-7575 44:9-10<2683 2015 44 382