caa a22 4500 44580033X CHVBK 20180317145138.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00704-011-0450-8 doi (NATIONALLICENCE)springer-10.1007/s00704-011-0450-8 Why do 2-day waves propagate westward? [Elektronische Daten] [Fei Liu, Gang Huang, Licheng Feng] In observations, the 2-day waves, identified as the convectively coupled equatorial inertio-gravity (IG) waves, only propagate westward. To understand this feature, a simple theoretical model is presented for the convectively coupled equatorial waves (CCEWs). Under the assumption that the convective heating is proportional to the vertical velocity on the first baroclinic mode, the nonlinear governing equation for the meridional velocity of the CCEWs can be derived. The optimal method is used to obtain the dispersion relation from this nonlinear equation, and the results show that the deep convection can slow down the IG waves by decreasing the mean state static stability, but the key leading to the westward propagation of the IG waves is the full meridional variation of the sea surface temperature (SST). The warm SST trapped near the equator excites long westward propagating IG waves, whereas the warm SST trapped near the ITCZ centered at 10° N excites short westward propagating IG waves. This theoretical model provides a simple tool to study the CCEWs in understanding the tropical circulation. Springer-Verlag, 2011 Liu Fei International Pacific Research Center, University of Hawai'i at Manoa, 96822, Honolulu, HI, USA aut Huang Gang Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Feng Licheng National Marine Environmental Forecasting Center, 100081, Beijing, China aut Theoretical and Applied Climatology Springer Vienna 106/3-4(2011-12-01), 443-448 0177-798X 106:3-4<443 2011 106 704 https://doi.org/10.1007/s00704-011-0450-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-011-0450-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Fei International Pacific Research Center, University of Hawai'i at Manoa, 96822, Honolulu, HI, USA aut NATIONALLICENCE 700 1- Huang Gang Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 700 1- Feng Licheng National Marine Environmental Forecasting Center, 100081, Beijing, China aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 106/3-4(2011-12-01), 443-448 0177-798X 106:3-4<443 2011 106 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer