FN Archimer Export Format
PT J
TI Low and high frequency Madden-Julian oscillations in austral summer: interannual variations
BT 
AF IZUMO, Takeshi
   MASSON, Sebastien
   VIALARD, Jerome
   DE BOYER MONTEGUT, Clement
   BEHERA, Swadhin K.
   MADEC, Gurvan
   TAKAHASHI, Keiko
   YAMAGATA, Toshio
AS 1:1,2;2:2;3:2;4:3;5:1;6:2;7:4;8:1,5;
FF 1:;2:;3:;4:PDG-DOP-DCB-OPS-LOS;5:;6:;7:;8:;
C1 Res Inst Global Change JAMSTEC, Yokohama, Kanagawa, Japan.
   IRD CNRS UPMC, LOCEAN, Paris, France.
   IFREMER, Brest, France.
   Earth Simulator Ctr JAMSTEC, Yokohama, Kanagawa, Japan.
   Univ Tokyo, Tokyo, Japan.
C2 JAMSTEC, JAPAN
   IPSL, FRANCE
   IFREMER, FRANCE
   JAMSTEC, JAPAN
   UNIV TOKYO, JAPAN
SI BREST
SE PDG-DOP-DCB-OPS-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-int-hors-europe
IF 3.843
TC 34
UR https://archimer.ifremer.fr/doc/00013/12416/9221.pdf
LA English
DT Article
CR CIRENE 2007
   VT 102 / CIRENE
   VT 75 / CIRENE
BO Le Suroît
   Marion Dufresne
DE ;Intraseasonal Madden-Julian oscillation (MJO);Seychelles-Chagos thermocline ridge/thermocline dome of the Indian Ocean;Indian Ocean dipole (IOD);El Nino southern oscillation (ENSO);Diurnal cycle;Oceanic diurnal warm layers;Air-sea interactions;Ocean-atmosphere coupling;Interannual variations;Mixed layer;Australian weather
AB The Madden-Julian oscillation (MJO) is the main component of intraseasonal variability of the tropical convection, with clear climatic impacts at an almost-global scale. Based on satellite observations, it is shown that there are two types of austral-summer MJO events (broadly defined as 30-120 days convective variability with eastward propagation of about 5 m/s). Equatorial MJO events have a period of 30-50 days and tend to be symmetric about the equator, whereas MJO events centered near 8A degrees S tend to have a longer period of 55-100 days. The lower-frequency variability is associated with a strong upper-ocean response, having a clear signature in both sea surface temperature and its diurnal cycle. These two MJO types have different interannual variations, and are modulated by the Indian Ocean Dipole (IOD). Following a negative IOD event, the lower-frequency southern MJO variability increases, while the higher-frequency equatorial MJO strongly diminishes. We propose two possible explanations for this change in properties of the MJO. One possibility is that changes in the background atmospheric circulation after an IOD favour the development of the low-frequency MJO. The other possibility is that the shallower thermocline ridge and mixed layer depth, by enhancing SST intraseasonal variability and thus ocean-atmosphere coupling in the southwest Indian Ocean (the breeding ground of southern MJO onset), favour the lower-frequency southern MJO variability.
PY 2010
PD SEP
SO Climate Dynamics
SN 0930-7575
PU Springer
VL 35
IS 4
UT 000281377200008
BP 669
EP 683
DI 10.1007/s00382-009-0655-z
ID 12416
ER

EF