Vertical Vorticity Structure Associated with the Boreal Summer Intraseasonal Oscillation: Barotropic or Baroclinic?
نویسندگان
چکیده
منابع مشابه
A Model for the Boreal Summer Intraseasonal Oscillation
The tropical intraseasonal oscillation (ISO) exhibits pronounced seasonality. The boreal summer ISO is more complex than its winter counterpart due to the coexistence of equatorial eastward, off-equatorial westward, and northward propagating, low-frequency modes and their interactions. Based on observational evidence and results obtained from numerical experiments, a mechanism is proposed for t...
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Abstract: We assess the limits of predictability of the large-scale cloud patterns in the boreal summer intraseasonal variability (BSISO) as a measure of outgoing longwave radiation (OLR), a proxy for convective activity. A recent developed nonlinear data analysis technique, nonlinear Laplacian spectrum analysis (NLSA), is applied to the OLR data, defining two spatial modes with high intermitte...
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The characteristic features of the boreal summer intraseasonal oscillation (BSISO) during its reinitiation period are studied using NCEP–NCAR reanalysis. Based on these observations and with the aid of an anomalous atmospheric general circulation model (AGCM), a possible mechanism responsible for the BSISO reinitiation is elucidated. The western equatorial Indian Ocean along the eastern African...
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The e¤ect of the Maritime Continent (MC) on the propagation characteristics of the boreal summer intraseasonal oscillation (ISO) over the Indo-western Pacific region were investigated by performing high-resolution (T159) atmospheric general circulation model (AGCM) simulations that remove and retain the MC. The most significant di¤erence, as revealed by a finite domain wavenumber-frequency spec...
متن کاملThe Boreal Summer Intraseasonal Oscillation: Relationship between Northward and Eastward Movement of Convection
The summertime intraseasonal oscillation (ISO) is an important component of the south Asian monsoon. Lagged regressions of intraseasonally filtered (25–80 days) outgoing longwave radiation (OLR) reveal that centers of convection move both northward and eastward from the central equatorial Indian Ocean subsequent to the initiation of an ISO. Eastward movement of convection is also seen at Indian...
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ژورنال
عنوان ژورنال: Atmosphere
سال: 2012
ISSN: 1598-3560
DOI: 10.14191/atmos.2012.22.2.259