Considerable theoretical work has been done attempting to model persistent atmospheric flow patterns (blocking) with localized, coherent structures superimposed on a mean westerly wind, in particular by Malguzzi (1984). In Malguzzi's theory, which assumes a baroclinic atmosphere, the existence of the coherent structure solution requires that certain constraints be satisfied by the mean zonal wi...

ABSTRAK Sorong, Papua Barat merupakan suatu wilayah di Indonesia bagian timur yang memiliki keindahan alam sangat indah dan potensial untuk dikelola sebagai daerah pariwisata serta perkebunan. Informasi prediksi curah hujan bulanan informasi penting dapat digunakan acuan dalam pengembangan tanaman perkebunan diantaranya cengkeh kelapa dikota Sorong. Penelitian ini bertujuan mengetahui bagaimana...

Meridional dipoles of zonal wind and geopotential height are found extensively in empirical orthogonal function (EOF) analysis and single-point correlation maps of observations and models. Notable examples are the North Atlantic Oscillation and the so-called annular modes (or the Arctic Oscillation). Minimal stochastic models are developed to explain the origin of such structure. In particular,...

The effects of wave and zonal mean ozone heating on the evolution of the quasi-biennial oscillation (QBO) are examined using a two-dimensional mechanistic model of the equatorial stratosphere. The model atmosphere is governed by coupled equations for the zonal mean and (linear) wave fields of ozone, temperature, and wind, and is driven by specifying the amplitudes of a Kelvin wave and a Rossby–...

In this paper we diagnose the intermodel spread in the Coupled Model Intercomparison Project Phase 5 (CMIP5) East Asian summer monsoon (EASM) simulations in the context of the moist static energy and moisture budgets. We find that the spatial distribution of the EASM precipitation simulated by different models is highly correlated with the meridional stationary eddy velocity, defined as the dev...

Abstract This work uses the Specified Dynamics‐Whole Atmosphere Community Climate Model with Ionosphere/Thermosphere eXtension (SD‐WACCM‐X) to determine and explain seasonality of migrating semidiurnal tide (SW2) components tropical upper mesosphere lower thermosphere (UMLT) temperature, zonal wind, meridional wind. also quantifies aliasing due SW2 in satellite‐based tidal estimates. Results sh...

During large El Niño events the westerly wind response to the eastern equatorial Pacific sea surface temperature anomalies (SSTAs) shifts southward during boreal winter and early spring, reaching latitudes of 58–78S. The resulting meridional asymmetry, along with a related seasonal weakening of wind anomalies on the equator are key elements in the termination of strong El Niño events. Using an ...

[1] Mars Global Surveyor is providing the first observations of transient eddies in the southern hemisphere of Mars. We derive basic properties of the traveling eddies that appear in midwinter (Ls = 134 –148 ) through analysis of radio occultation measurements at 67 –70 S latitude. The dominant mode has a period of 2 solar days and a zonal wavenumber s = 3. Strong zonal variations in eddy ampli...

A 36-h adjoint-based forecast sensitivity study of three response functions defined in the lower troposphere—average temperature in an isolated region of the upper Midwest (R1), meridional temperature difference (R2), and average zonal component of the wind (R3)—is conducted with the goal of providing a synoptic and dynamic interpretation of the sensitivity gradient structure and evolution. In ...

Using an asymptotic expansion, a balancemodel is derived for the shallow-water equations (SWE) on the equatorial b plane that is valid for planetary-scale equatorial dynamics and includes Kelvin waves. In contrast to many theories of tropical dynamics, neither a strict balance between diabatic heating and vertical motion nor a small Froude number is required. Instead, the expansion is based on ...