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• W3015731514 endingPage "2186" @default.
• W3015731514 startingPage "2163" @default.
• W3015731514 abstract "Abstract Simple process models and complex climate models are remarkably sensitive to the time scale of convective adjustment τ, but this parameter remains poorly constrained and understood. This study uses the linear-range slope of a semiempirical relationship between precipitation and a lower-free-tropospheric buoyancy measure BL. The BL measure is a function of layer-averaged moist enthalpy in the boundary layer (150-hPa-thick layer above surface), and temperature and moisture in the lower free troposphere (boundary layer top to 500 hPa). Sensitivity parameters with units of time quantify the BL response to its component perturbations. In moist enthalpy units, BL is more sensitive to temperature than equivalent moisture perturbations. However, column-integrated moist static energy conservation ensures that temperature and moisture are equally altered during the adjustment process. Multiple adjusted states with different temperature–moisture combinations exist; the BL sensitivity parameters govern the relationship between adjusted states, and also combine to yield a time scale of convective adjustment ~2 h. This value is comparable to τ values used in cumulus parameterization closures. Disparities in previously reported values of τ are attributed to the neglect of the temperature contribution to precipitation, and to averaging operations that include data from both precipitating and nonprecipitating regimes. A stochastic model of tropical convection demonstrates how either averaging operations or neglected environmental influences on precipitation can yield τ estimates longer than the true τ value built into the model. The analysis here culminates in construction of a precipitation closure with both moisture and temperature adjustment (q–T closure), suitable for use in both linearized and nonlinear, intermediate-complexity models." @default.
• W3015731514 created "2020-04-17" @default.
• W3015731514 creator A5034471329 @default.
• W3015731514 creator A5038167645 @default.
• W3015731514 creator A5065915056 @default.
• W3015731514 date "2020-05-28" @default.
• W3015731514 modified "2023-09-25" @default.
• W3015731514 title "Deep Convective Adjustment of Temperature and Moisture" @default.
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