ENSO influence on summer temperature over Arabian Peninsula: role of mid-latitude circulation
This study discusses the interannual variability of the summer (June–August) season surface air temperature (SAT) over the Arabian Peninsula and its relationship to the global circulation patterns under the influence of El Nino Southern Oscillation (ENSO). A composite analysis based on the above (below) normal summer SAT over the Arabian Peninsula reveals a wavelike pattern resembling the mid-latitude Circumglobal Wave Train (CGT). The positive (negative) phase of the CGT is associated with above (below) normal SAT anomalies over the Arabian Peninsula. Further, the Arabian Peninsula summer SAT is also found to be associated with ENSO and this association has strengthened in recent decades as compared to before 1980s. The ENSO induced upper level circulation patterns resemble the CGT pattern. The ENSO warm phase over the central and eastern Pacific is associated with anomalous low pressure anomalies over the Eurasian region while the cold phase associated with anomalous high pressure. This favours the above normal SAT anomalies over the Eurasian region including the northern parts of the Peninsula during the cold phase of ENSO and below normal temperature during the warm phase. The weakening of upper level low-pressure anomalies over central Asia during the positive phase of CGT also favours the extension of the Eurasian high over the Arabian Peninsula. Additionally, the climate model simulations experiments performed with newly developed Saudi-KAU Atmospheric Global Climate Model (AGCM) also support the observed findings.
KeywordsSurface air temperature Circumglobal wave train pattern ENSO Arabian Peninsula
The authors would like to acknowledge the Centre of Excellence for Climate Change Research (CECCR) and Deanship of Graduate Studies (DGS), King Abdulaziz University for supporting this research work. The computational work is carried out on the Aziz Supercomputer at King Abdulaziz University High Performance Computing Centre, Jeddah, Saudi Arabia.
- Bonan GB (1998) The land surface climatology of the NCAR land surface model coupled to the NCAR community climate model. J Clim 11:1307–1326. https://doi.org/10.1175/1520-0442(1998)011%3c1307:TLSCOT%3e2.0.CO;2 CrossRefGoogle Scholar
- Branstator G (2002) Circumglobal teleconnections, the jet stream waveguide, and the North Atlantic Oscillation. J Clim 15:1893–1910. https://doi.org/10.1175/1520-0442(2002)015%3c1893:CTTJSW%3e2.0.CO;2 CrossRefGoogle Scholar
- Holtslag AAM, Boville BA (1993) Local versus nonlocal boundary-layer diffusion in a global climate model. J Clim 6:1825–1842. https://doi.org/10.1175/1520-0442(1993)006%3c1825:LVNBLD%3e2.0.CO;2 CrossRefGoogle Scholar
- Horel JD, Wallace JM (1981) Planetary-scale phenomena associated with the Southern Oscillation. Mon Weather Rev 109:813–829. https://doi.org/10.1175/1520-0493(1981)109%3c0813:PSAPAW%3e2.0.CO;2 CrossRefGoogle Scholar
- Kalnay E, Kanamitsu M, Kistler R et al (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471. https://doi.org/10.1175/1520-0477(1996)077%3c0437:TNYRP%3e2.0.CO;2 CrossRefGoogle Scholar
- Kanamitsu M, Ebisuzaki W, Woollen J et al (2002) NCEP-DOE AMIP-II reanalysis (R-2). Bull Am Meteorol Soc 83:1631–1643. https://doi.org/10.1175/bams-83-11-1631(2002)083%3c1631:nar%3e2.3.co;2 CrossRefGoogle Scholar
- Kinter IL, Miyakoda K, Yang S (2002) Recent change in the connection from the Asian monsoon to ENSO. J Clim. https://doi.org/10.1175/1520-0442(2002)015%3c1203:rcitcf%3e2.0.co;2 Google Scholar
- Kripalani RH, Kulkarni A (1997) Rainfall variability over South-East Asia—connections with Indian monsoon and Enso extremes: new perspectives. Int J Climatol. https://doi.org/10.1002/(sici)1097-0088(199709)17:11%3c1155:aid-joc188%3e3.0.co;2-b Google Scholar
- Krishnan R, Zhang C, Sugi M (2000) Dynamics of breaks in the indian summer monsoon. J Atmos Sci. https://doi.org/10.1175/1520-0469(2000)057%3c1354:dobiti%3e2.0.co;2 Google Scholar
- Warner et al. (2004) Desert meteorologyGoogle Scholar