Abstract
The 30–60-day boreal summer intraseasonal oscillation (BSISO) is a dominant variability of the Asian summer monsoon (ASM), with its intensity being quantified by intraseasonal standard deviations based on OLR data. The spatial and interannual variations of the BSISO intensity are identified via empirical orthogonal function (EOF) analysis for the period 1981–2014. The first EOF mode (EOF1) shows a spatially coherent enhancement or suppression of BSISO activity over the entire ASM region, and the interannual variability of this mode is related to the sea surface temperature anomaly (SSTA) contrast between the central–eastern North Pacific (CNP) and tropical Indian Ocean. In contrast, the second mode (EOF2) exhibits a seesaw pattern between the southeastern equatorial Indian Ocean (EIO) and equatorial western Pacific (EWP), with the interannual fluctuation linked with developing ENSO events. During strong years of EOF1 mode, the enhanced low-level westerlies induced by the summer-mean SSTA contrast between the warmer CNP and cooler tropical Indian Ocean tend to form a wetter moisture background over the eastern EIO, which interacts with intraseasonal low-level convergent flows, leading to stronger equatorial eastward propagation. The intensified easterly shear favors stronger northward propagation over the South Asian and Eastern Asian/Western North Pacific sectors, respectively. Opposite situation is for weak years. For interannual variations of EOF2 mode, the seesaw patterns with enhanced BSISO activity over the southeastern EIO while weakened activity over the EWP mostly occur in the La Niña developing summers, but inverse patterns appear in the El Niño developing summers.
Similar content being viewed by others
References
Ajayamohan RS, Rao SA, Yamagata T (2008) Influence of Indian Ocean dipole on poleward propagation of boreal summer intraseasonal oscillations. J Clim 21:5437–5454
Annamalai H, Slingo JM (2001) Active/break cycles: diagnosis of the intraseasonal variability of the Asian summer monsoon. Clim Dyn 18:85–102
Annamalai H, Sperber KR (2005) Regional heat sources and the active and break phases of boreal summer intraseasonal (30–50 day) variability. J Atmos Sci 62:2726–2748
Bellon G, Sobel AH (2008) Instability of the axisymmetric monsoon flow and intraseasonal oscillation. J Geophys Res 113:D07108
Bhat GS (2006) The Indian drought of 2002—a sub-seasonal phenomenon. Q J R Meteorol Soc 132:2583–2602
Bretherton CS, Widmann M, Dymnikov VP, Wallace JM, Blade I (1990) The effective number of spatial degrees of freedom of a time-varying field. J Clim 12:1990–2009
Deng L, Li T, Liu J, Melinda P (2016) Factors controlling the interannual variations of MJO intensity. J Meteor Res 30(3):328–340
Ding QH, Wang B (2009) Predicting extreme phases of the Indian summer monsoon. J Clim 22:346–363
Hoyos CD, Webster PJ (2007) The role of intraseasonal variability in the nature of Asian monsoon precipitation. J Clim 20:4402–4424
Hsu PC, Li T (2011) Interactions between boreal summer intraseasonal oscillations and synoptic-scale disturbances over the western North Pacific. Part II: Apparent heat and moisture sources and eddy momentum transport. J Clim 24:942–961
Hsu PC, Li T (2012) Role of the boundary layer moisture asymmetry in causing the eastward propagation of the Madden–Julian Oscillation. J Clim 25:4914–4931
Huffman GJ, Adler RF, Morrissey M, Bolvin DT, Curtis S, Joyce R, McGavock B, Susskind J (2001) Global precipitation at one-degree daily resolution from multi-satellite observations. J Hydrometeorol 2:36–50
Jiang XA, Li T, Wang B (2004) Structures and mechanisms of the northward propagating boreal summer intraseasonal oscillation. J Clim 17:1022–1039
Jones C, Carvalho LMV, Higgins RW, Waliser DE, Schemm JKE (2004) Climatology of tropical intraseasonal convective anomalies: 1979–2002. J Clim 17:523–539
Kajikawa Y, Yasunari T (2005) Interannual variability of the 10–25- and 30–60-day variation over the South China Sea during boreal summer. Geophys Res Lett 32:L04710
Kemball-Cook S, Wang B (2001) Equatorial waves and air–sea interaction in the boreal summer intraseasonal oscillation. J Clim 14:2923–2942
Kobayashi S, Ota Y, Harada Y, Ebita A, Moriya M, Onoda H, Onogi K, Kamahori H, Kobayashi C, Endo H, Miyaoka K, Takahashi K (2015) The JRA-55 reanalysis: general specifications and basic characteristics. J Meteorol Soc Jpn 93:5–48
Lawrence DM, Webster PJ (2002) The boreal summer intraseasonal oscillation: relationship between northward and eastward movement of convection. J Atmos Sci 59:1593–1606
Lee JY, Wang B, Wheeler MC, Fu XH, Waliser DE, Kang IS (2013) Real-time multivariate indices for the boreal summer intraseasonal oscillation over the Asian summer monsoon region. Clim Dyn 40:493–509
Li J, Mao J (2016) Changes in the boreal summer intraseasonal oscillation projected by the CNRM-CM5 model under the RCP 8.5 scenario. Clim Dym 47:3713–3736
Li RCY, Zhou W (2015) Multiscale control of summertime persistent heavy precipitation events over South China in association with synoptic, intraseasonal, and low-frequency background. Clim Dyn 45:1043–1057
Li C, Jia X, Ling J, Zhou W, Zhang C (2009) Sensitivity of MJO simulations to diabatic heating profiles. Clim Dyn 32:167–187
Li RCY, Zhou W, Li T (2014) Influences of the Pacific-Japan teleconnection pattern on synoptic-scale variability in the western North Pacific. J Clim 27:140–154
Li J, Mao J, Wu G (2015) A case study of the impact of boreal summer intraseasonal oscillations on Yangtze rainfall. Clim Dyn 44:2683–2702
Liebmann B, Smith CA (1996) Description of a complete (interpolated) outgoing longwave radiation dataset. Bull Am Meteorol Soc 77:1275–1277
Liebmann B, Hendon HH, Glick JD (1994) The relationship between tropical cyclones of the western Pacific and Indian Oceans and the Madden–Julian oscillation. J Meteorol Soc Jpn 72:401–412
Lin A, Li T (2008) Energy spectrum characteristics of boreal summer intraseasonal oscillations: climatology and variations during the ENSO developing and decaying phases. J Clim 21:6304–6320
Liu F, Li T, Wang H, Zhang YW (2016) Modulation of boreal summer intraseasonal oscillations over the western North Pacific by ENSO. J Clim. https://doi.org/10.1175/JCLI-D-15-0831.1
Madden RA, Julian PR (1971) Detection of a 40–50 day oscillation in the zonal wind in the tropical Pacific. J Atmos Sci 28:702–708
Madden RA, Julian PR (1972) Description of global-scale circulation cells in the Tropics with a 40–50 day period. J Atmos Sci 29:1109–1123
Maloney ED, Hartmann DL (2000) Modulation of eastern North Pacific hurricanes by the Madden–Julian oscillation. J Clim 13:1451–1460
Mao J, Chan JCL (2005) Intraseasonal variability of the South China Sea summer monsoon. J Clim 18:2388–2402
Mao J, Wu G (2010) Intraseasonal modulation of tropical cyclogenesis in the western North Pacific: a case study. Theor Appl Climatol 100:397–411
Mao J, Sun Z, Wu G (2010) 20–50-day oscillation of summer Yangtze rainfall in response to intraseasonal variations in the subtropical high over the western North Pacific and South China Sea. Clim Dyn 34:747–761
North GR, Bell TL, Cahalan RF, Moeng FJ (1982) Sampling errors in the estimation of empirical orthogonal functions. Mon Weather Rev 110:699–706
Qi YJ, Zhang RH, Li T, Wen M (2008) Interactions between the summer mean monsoon and the intraseasonal oscillation in the Indian monsoon region. Geophys Res Lett 35:L17704
Reynolds RW, Smith TM, Liu CY, Chelton DB, Casey KS, Schlax MG (2007) Daily high-resolution-blended analyses for sea surface temperature. J Clim 20:5473–5496
Saji NH, Goswami BN, Vinayachandran PN, Yamagata T (1999) A dipole mode in the tropical Indian Ocean. Nature 401:360–363
Seo KH, Wang SchemmJ-KE, Kumar W A (2007) The boreal summer intraseasonal oscillation simulated in the NCEP Climate Forecast System (CFS): the effect of sea surface temperature. Mon Weather Rev 135:1807–1827
Tao SY, Chen L (1987) A review of recent research on the onset Asian summer monsoon in China, In: Chang CP, Krishnamurti TN (eds) Monsoon Meteorology. Oxford University Press, Oxford, pp 60–92
Teng HY, Wang B (2003) Interannual variations of the boreal summer intraseasonal oscillation in the Asian–Pacific Region. J Clim 16:3572–3584
Tong HW, Chan JCL, Zhou W (2009) The role of MJO and mid-latitude fronts in the South China Sea summer monsoon onset. Clim Dyn 33:827–841
Trenberth KE (2011) Changes in precipitation with climate change. Clim Res 47:123–138
Wang B, Rui H (1990) Synoptic climatology of transient tropical intraseasonal convection anomalies: 1975–1985. Meteorol Atmos Phys 44:43–61
Wang B, Xie X (1997) A model for the boreal summer intraseasonal oscillation. J Atmos Sci 54:72–86
Webster PJ, Magana VO, Palmer TN, Shukla J, Tomas RA, Yanai M, Yasunari T (1998) Monsoons: processes, predictability, and the prospects for prediction. J Geophys Res 103(C7):14451–14510
Wu RG, Cao X (2016) Relationship of boreal summer 10–20-day and 30–60-day intraseasonal oscillation intensity over the tropical western North Pacific to tropical Indo-Pacific SST. Clim Dyn. https://doi.org/10.1007/s00382-016-3282-5
Wu RG, Song L (2017) Spatiotemporal change of intraseasonal oscillation intensity over the tropical Indo-Pacific Ocean associated with El Niño and La Niña events. Clim Dyn. https://doi.org/10.1007/s00382-017-3675-0
Yanai M, Esbensen S, Chu J-H (1973) Determination of bulk properties of tropical cloud clusters from large-scale heat and moisture budgets. J Atmos Sci 30:611–627
Yang J, Wang B, Wang B (2008) Anticorrelated intensity change of the quasi-biweekly and 30–50-day oscillations over the South China Sea. Geophys Res Lett 35:L16702
Zhou W, Chan JCL (2005) Intraseasonal oscillations and the South China Sea summer monsoon onset. Int J Climatol 25:1585–1609
Zhu C, Nakazawa T, Li J, Chen L (2003) The 30–60 day intraseasonal oscillation over the western North Pacific Ocean and its impacts on summer flooding in China during 1998. Geophys Res Lett 30(18):1952
Acknowledgements
This research was jointly supported by the SOA Program on Global Change and Air–Sea Interactions (GASI-IPOVAI-03), the National Natural Science Foundation of China (91537103 and 41730963), the National Basic Research Program of China (2014CB953902), the Priority Research Program of the Chinese Academy of Sciences (QYZDY-SSW-DQC018) and the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (CUG170643).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Li, J., Mao, J. Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region. Clim Dyn 52, 1651–1672 (2019). https://doi.org/10.1007/s00382-018-4216-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00382-018-4216-1