TY - JOUR
T1 - The structure and propagation of intraseasonal oscillations appearing in a GFDL general circulation model.
AU - Lau, N. C.
AU - Lau, K. M.
PY - 1986
Y1 - 1986
N2 - The three-dimensional structure and temporal evolution of quasi-periodic, planetary-scale tropospheric oscillations simulated by a 15-wavenumber GCM are investigated by applying cross- spectral, eigenvector, composite and temporal correlation techniques to 12 years of model output. Evident from this diagnostic study is the presence in the model tropics of well-defined eastward travelling features with spatial scales of zonal wavenumbers 1 and 2, and with temporal scales of 25-40 and 15-20 days, respectively. During the northern summer, the 25-40 day oscillations coincide with the occurrence of northward moving, zonally elongated rainbands over the monsoon region of South Asia. During the northern winter the 25-40 day phenomena in the tropics are linked to well-organized extratropical wave trains spanning the Eurasian and Pacific/North American sectors. -from Authors
AB - The three-dimensional structure and temporal evolution of quasi-periodic, planetary-scale tropospheric oscillations simulated by a 15-wavenumber GCM are investigated by applying cross- spectral, eigenvector, composite and temporal correlation techniques to 12 years of model output. Evident from this diagnostic study is the presence in the model tropics of well-defined eastward travelling features with spatial scales of zonal wavenumbers 1 and 2, and with temporal scales of 25-40 and 15-20 days, respectively. During the northern summer, the 25-40 day oscillations coincide with the occurrence of northward moving, zonally elongated rainbands over the monsoon region of South Asia. During the northern winter the 25-40 day phenomena in the tropics are linked to well-organized extratropical wave trains spanning the Eurasian and Pacific/North American sectors. -from Authors
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U2 - 10.1175/1520-0469(1986)043<2023:TSAPOI>2.0.CO;2
DO - 10.1175/1520-0469(1986)043<2023:TSAPOI>2.0.CO;2
M3 - Article
AN - SCOPUS:0022846492
SN - 0022-4928
VL - 43
SP - 2023
EP - 2047
JO - Journals of the Atmospheric Sciences
JF - Journals of the Atmospheric Sciences
IS - 19
ER -