Modified quasi-geostrophic equations;
Besov spaces;
local well-posedness;
smoothing effect;
large-time global regular solutions;
GLOBAL WELL-POSEDNESS;
NAVIER-STOKES EQUATIONS;
MAXIMUM-PRINCIPLES;
INITIAL DATA;
CRITERION;
D O I:
10.3934/dcds.2019152
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
This paper is devoted to the study of the modified quasi-geostrophic equation partial derivative(t)theta + u . del theta + nu Lambda(alpha)theta = 0 with u = Lambda R-beta(perpendicular to)theta in R-2. By the Littlewood-Paley theory, we obtain the local well-posedness and the smoothing effect of the equation in critical Besov spaces. These results are applied to show the global existence of regular solutions for the critical case beta = alpha - 1 and the existence of regular solutions for large time t > T with respect to the supercritical case beta > alpha - 1 in Besov spaces. Earlier results for the equation in Hilbert spaces H-s spaces are improved.