The influence of atmospheric cloud radiative effects on the 1 large - scale atmospheric circulation
نویسندگان
چکیده
5 The influence of clouds on the large-scale atmospheric circulation is examined in numerical 6 simulations from an atmospheric general circulation model run with and without atmospheric 7 cloud radiative effects (ACRE). 8 In the extratropics of both hemispheres, the primary impacts of ACRE on the circulation 9 include: 1) increases in the meridional temperature gradient and decreases in static stability 10 in the midlatitude upper troposphere; 2) strengthening of the midlatitude jet; 3) increases in 11 extratropical eddy kinetic energy by up to 30%; and 4) increases in precipitation at middle 12 latitudes but decreases at subtropical latitudes. In the tropics, the primary impacts of ACRE 13 include: 1) eastward wind anomalies in the tropical upper troposphere/lower stratosphere 14 (UTLS); and 2) reductions in tropical precipitation. 15 The impacts of ACRE on the atmospheric circulation are interpreted in the context of 16 a series of dynamical and physical processes. The changes in the extratropical circulation 17 and precipitation are consistent with the influence of ACRE on the baroclinicity and eddy 18 fluxes of momentum in the extratropical upper troposphere; the changes in the zonal wind in 19 the UTLS with the influence of ACRE on the amplitude of the equatorial planetary waves; 20 and the changes in the tropical precipitation with the energetic constraints on the tropical 21 troposphere. 22 The results make clear that ACRE have a pronounced influence on the atmospheric cir23 culation not only at tropical latitudes, but at extratropical latitudes as well. They highlight 24 the critical importance of simulating correctly ACRE in global climate models. 25
منابع مشابه
The Influence of Atmospheric Cloud Radiative Effects on the Large-Scale Atmospheric Circulation
The influence of clouds on the large-scale atmospheric circulation is examined in numerical simulations from an atmospheric general circulation model run with and without atmospheric cloud radiative effects (ACRE). In the extratropics of both hemispheres, the primary impacts of ACRE on the circulation include 1) increases in the meridional temperature gradient and decreases in static stability ...
متن کاملLarge-scale atmospheric circulation patterns associated with the occurrence of severe storms Zab basin
متن کامل
Study of the models of large-scale atmospheric circulation system model on intesify rainfall in Ardebil plain
Atmospheric circulation is important to determine the surface climate and environment, and affect regional climate and surface features. In this study, to quantify its effect, the classification system, developed by Lamb is applied to obtain circulation information for Ardabil, North West Province in Iran, on a daily basis, and is a method to classify synoptic weather for study area. For that p...
متن کاملInfluence of atmospheric circulation patterns on dust transport during Harmattan Period in West Africa
This study has used TOMS AI as well as the reanalysis dataset of thirty-four years (1979-2012) to investigate the influence of atmospheric circulation on dust transport during the Harmattan period in West Africa, using Aerosol Index (AI) data, obtained from various satellite sensors. Changes in Inter-Tropical Discontinuity (ITD), Sea Surface Temperature (SST) over the Gulf of Guinea, and North ...
متن کاملThe Influence of Atmospheric Cloud Radiative Effects on the Large-Scale Stratospheric Circulation
Previous studies have explored the influence of atmospheric cloud radiative effects (ACRE) on the tropospheric circulation. Here the authors explore the influence of ACRE on the stratospheric circulation. The response of the stratospheric circulation to ACRE is assessed by comparing simulations run with and without ACRE. The stratospheric circulation response to ACRE is reproducible in a range ...
متن کامل