气象
氣象
기상
Meteorological Monthly
2015年
9期
1049-1057
,共9页
台风%Sawyer-Eliassen 方程%次级环流%梯度风平衡%边界层
檯風%Sawyer-Eliassen 方程%次級環流%梯度風平衡%邊界層
태풍%Sawyer-Eliassen 방정%차급배류%제도풍평형%변계층
typhoon%Sawyer-Eliassen equation%secondary circulation%gradient wind balance%boundary layer
提次级环流在台风的发展和维持中起着重要作用，基于梯度风平衡的 Sawyer-Eliassen（SE）方程常用于台风次级环流的诊断。然而梯度风平衡关系在台风边界层及边界附近有较大误差，这导致 SE 方程求解出的次级环流在边界层也会有较大误差。本文在梯度风平衡方程中保留包含径向摩擦力项在内的超梯度力项，得到包含超梯度力作用的 SE 方程，从方程形式上看超梯度力主要是通过调节与斜压性相关的系数来影响次级环流的。对“森拉克”（2008）台风次级环流的诊断结果显示，在不人为改变边界层流场结构的情况下，新的 SE 方程能显著改善次级环流的求解效果，避免眼墙外侧边界层附近的虚假对流并且减小虚假入流。
提次級環流在檯風的髮展和維持中起著重要作用，基于梯度風平衡的 Sawyer-Eliassen（SE）方程常用于檯風次級環流的診斷。然而梯度風平衡關繫在檯風邊界層及邊界附近有較大誤差，這導緻 SE 方程求解齣的次級環流在邊界層也會有較大誤差。本文在梯度風平衡方程中保留包含徑嚮摩抆力項在內的超梯度力項，得到包含超梯度力作用的 SE 方程，從方程形式上看超梯度力主要是通過調節與斜壓性相關的繫數來影響次級環流的。對“森拉剋”（2008）檯風次級環流的診斷結果顯示，在不人為改變邊界層流場結構的情況下，新的 SE 方程能顯著改善次級環流的求解效果，避免眼牆外側邊界層附近的虛假對流併且減小虛假入流。
제차급배류재태풍적발전화유지중기착중요작용，기우제도풍평형적 Sawyer-Eliassen（SE）방정상용우태풍차급배류적진단。연이제도풍평형관계재태풍변계층급변계부근유교대오차，저도치 SE 방정구해출적차급배류재변계층야회유교대오차。본문재제도풍평형방정중보류포함경향마찰력항재내적초제도력항，득도포함초제도력작용적 SE 방정，종방정형식상간초제도력주요시통과조절여사압성상관적계수래영향차급배류적。대“삼랍극”（2008）태풍차급배류적진단결과현시，재불인위개변변계층류장결구적정황하，신적 SE 방정능현저개선차급배류적구해효과，피면안장외측변계층부근적허가대류병차감소허가입류。
Secondary circulation plays an important role in the intensifying and maintenance of typhoon. The Sawyer-Eliassen (SE)equation derived based on gradient wind balance is usually used to diagnose the secondary circulation of typhoon.However,the gradient wind balance has large errors within and near the boundary layer,which leads to large errors of the secondary circulation solved by SE equation within the boundary layer.Based on the full formation of the radial momentum equation,a novel SE equation is de-rived in this paper.The supergradient force including the radial friction of boundary layer is therefore con-sidered in the novel SE equation.And it turns out that the supergradient force can modulate the secondary circulation by affecting the coefficients related to baroclinicity in SE equation.The diagnostic analysis of the typhoon Sinlaku (2008)shows the novel SE equation can improve the solved secondary circulation re-markably without subjective modifying the flow structure near boundary layer.The novel SE equation can avoid the false convection at the out flank of the eyewall in and near the boundary layer,and can reduce the false strong boundary layer inflow.
