The Glass House

Seager, Allan

doi:10.3998/mpub.9230

Cited by 3 publications

(2 citation statements)

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“…Neelin and Held (1987) used the concept of moist static energy in parametrizing deep convection. Seager's (1991) hypothesis was that buoyancy fluxes were more important than the convergence field in determining deep convection. However none of these schemes have been successful in representing the large-scale organized part of deep convection.…”

Section: Themodelmentioning

confidence: 99%

“…To parametrize it within the framework of a linear model is a daunting task. An attempt to do this by including a simple moisture balance equation has not been successful (Seager 1991); therefore, we shall not attempt to calculate the atmospheric heating following some simple dynamical framework. Instead, we estimate it from SST on the basis of an empirical relation between SST and 'observed' precipitation.…”

Section: Introductionmentioning

confidence: 99%

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An improved linear model of tropical surface wind variability

Saji¹,

Goswami²

1996

Quart J Royal Meteoro Soc

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For coupled modelling studies, the atmospheric component is required to simulate the large-scale part of the observed surface winds accurately, as only this part is responsible for driving low-frequency interannual variability in the oceans. A simple linear model of the tropical atmosphere is developed in which surface winds are viewed as the response of the atmospheric boundary layer to pressure perturbations produced by deep convection and sea surface temperature (SST) gradients. An empirical parametrization of total convection as a nonlinear function of total SST is adopted. The large-scale variability of the simulated surface winds is examined for the period 1974-1991. The model not only captures the large-scale low-frequency part of the surface winds given by the first two empirical orthogonal functions (EOFs), it also successfully simulates the equatorial surface wind anomalies and their evolution during the entire period 1974-1991.Certain interesting differences between precipitation forcing and SST induced forcing of surface winds is brought out in this study. The precipitation forcing was found to be dominant over the central and western Pacific, while the SST forcing was found to be dominant over the eastern Pacific. The resultant wind response was also found to reflect this behaviour. The most interesting result is the change in balance of the precipitation-related and SST-gradient-related terms in the forcing of anomalous and climatological winds. Our results indicate that convective heating predominates over SST-gradient-induced effects in forcing anomalous winds, but the balance reverses in the case of the climatological winds. We also find that SST-gradient effects are critical in the simulation of the climatological wind field.

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Section: Themodelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%