Dynamical Framework of IAP Nine-Level Atmospheric General Circulation Model

The dynamical framework of the nine-level version of the IAP AGCM is presented in this paper. The emphasis of the model's description is put on the following two aspects:(1) A model's standard atmosphere, which is a satisfactory approximation to the observed troposphere and lower stratosphere standard atmosphere, is introduced into the equations of the model to permit a more accurate calculation of the vertical transport terms, especially near the tropopause; (2) The vertical levels of the model are carefully selected to guarantee a smooth dependence of layer thickness upon pressure in order to reduce the truncation error involved in the unequal interval vertical finite-differencing. For testing the model, two kinds of linear baroclinic Rossby-Haurwitz waves, one of which has a dynamically stable vertical structure and the other has a relatively unstable one, are constructed to provide initial conditions for numerical experiments. The two waves have been integrated for more than 300 days and 100 days respectively by using the model and both of them are propagating westward with almost identical phase-speed during the time period of the integrations. No obvious change of the wave patterns is found at the levels in the model's troposphere. The amplitudes of both two waves at the uppermost level, however, exhibit rather significant oscillation with time, of which the periods are exactly 20 days and 25 days espectively.The explanation of this interesting phenomena is still under investigation.

Comparison and Examination of Dynamic Frameworks of IAP and OSU AGCM

A brief description of the dynamic framework of the IAP 2-L AGCM (referred as 'IAP DF') is presented in contrast with the corresponding 'OSU DF' and preliminary comparison and examination of the IAP DF and the OSU DF with the aid of numerical experiments using a set of baroclinic Rossby-Haurwitz wave initial conditions is performed.The results of the numerical experiments show that both the IAP DF arid the OSU DF are long-term computational stable and are able to simulate the fundamental behavior of the Rossby-Haurwitz wave under the limitation of 7.5 minutes time interval. In the respect of the prediction of the large-scale wave, the IAP DF is better than the OSU DF, however, the OSU DF gives better predictions of zonal mean status than the IAP DF does. Another important contrast is that the level of small-scale noise of the IAP DF is higher than the OSU DF, on the contrary, the damping effect of the OSU DF on large-scale vortex field is stronger than the IAP DF.

An Overview of the Dynamic Framework in Earth-System Model and Its Well-Posedness

The well-posedness of the dynamic framework in earth-system model(ESM for short)is a common issue in earth sciences and mathematics.In this paper,the authors first introduce the research history and fundamental roles of the well-posedness of the dynamic framework in the ESM,emphasizing the three core components of ESM,i.e.,the atmospheric general circulation model(AGCM for short),land-surface model(LSM for short)and oceanic general circulation model(OGCM for short)and their couplings.Then,some research advances made by their own research group are outlined.Finally,future research prospects are discussed.

Scalable Ambient Pressure Synthesis of Covalent Organic Frameworks and Their Colorimetric Nanocomposites through Dynamic Imine Exchange Reactions

A novel scale-up ambient pressure synthetic strategy for the preparation of imine-based covalent organic frameworks（COFs） was proposed through dynamic imine exchange reaction mechanism. The obtained COFs exhibited good crystallinity and much higher porosity comparable to their solvothermally synthesized counterparts. Moreover, under ambient pressure, the COF nanofibers could readily grow on the surface of polyimide films, and the resulted nanocomposite film showed an interesting colorimetric acid-responsive behavior.