The role of surface heat fluxes in tropical intraseasonal oscillations
نویسندگان
چکیده
ADAM H. SOBEL1*, ERIC D. MALONEY2, GILLES BELLON3 AND DARGAN M. FRIERSON4 Department of Applied Physics and Applied Mathematics and Department of Earth and Environmental Sciences Columbia University, 500 West 120th Street, Rm. 217, New York 10027, USA Department of Atmospheric Sciences, Colorado State University, Fort Collins, Colorado 80523, USA Department of Applied Physics and Applied Mathematics, Columbia University, New York 10027, USA Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, USA *e-mail: [email protected]
منابع مشابه
Surface fluxes and tropical intraseasonal variability: a reassessment
The authors argue for the hypothesis that interactive feedbacks involving surface enthalpy fluxes are important to the dynamics of tropical intraseasonal variability. These include cloud-radiative feedbacks as well as surface turbulent flux feedbacks; the former effectively act to transport enthalpy from the ocean to the atmosphere, as do the latter. Evidence in favor of this hypothesis include...
متن کاملUnited Mechanisms for the Generation of Low- and High-Frequency Tropical Waves. Part I: Control Experiments with Moist Convective Adjustment
To examine several mechanisms for the generation of lowand high-frequency tropical waves, numerical experiments are conducted using an idealized nine-level R21 spectral model with the original scheme of moist convective adjustment (MCA). The model prescribes globally uniform, time-independent distributions of sea surface temperatures and insolation, thereby excluding stationary waves and extrat...
متن کاملImpact of atmospheric submonthly oscillations on sea surface temperature of the tropical Indian Ocean
[1] Impacts of atmospheric intraseasonal oscillations (ISOs) at submonthly periods (10–30 days) on Indian Ocean sea surface temperature (SST) are studied using satellite observed outgoing long wave radiation, QuikSCAT winds, SST and an ocean general circulation model for the period of 1999–2004. The results suggest that submonthly ISOs can cause significant 10–30 day SST changes throughout the ...
متن کاملA role for ocean biota in tropical intraseasonal atmospheric variability
[1] We propose that temporal variations within the marine plankton system can induce intraseasonal variations in sea surface temperature (SST) through the effect on solar penetration due to chlorophyll and other optically active organic components. Sensitivity studies with a simple model suggest that these small oscillations in SST may stimulate radiative-convective oscillations in the atmosphe...
متن کاملPoleward-Propagating Intraseasonal Monsoon Disturbances in an Intermediate-Complexity Axisymmetric Model
A model of intermediate complexity based on quasi-equilibrium theory—a version of the quasiequilibrium tropical circulation model with a prognostic atmospheric boundary layer, as well as two freetropospheric modes in momentum, and one each in moisture and temperature—is used in a zonally symmetric aquaplanet configuration to simulate aspects of the South Asian monsoon and its variability. Key q...
متن کامل