大气科学进展（英文版）
大氣科學進展（英文版）
대기과학진전（영문판）
ADVANCES IN ATMOSPHERIC SCIENCES
2010年
2期
337-355
,共19页
曾智华%Yuqing WANG%端义宏%陈联寿%高志球
曾智華%Yuqing WANG%耑義宏%陳聯壽%高誌毬
증지화%Yuqing WANG%단의굉%진련수%고지구
热带气旋结构%强度参数%粗糙度参数%海面%参数化方案%全球定位系统%阻力系数%摩擦耗散
熱帶氣鏇結構%彊度參數%粗糙度參數%海麵%參數化方案%全毬定位繫統%阻力繫數%摩抆耗散
열대기선결구%강도삼수%조조도삼수%해면%삼수화방안%전구정위계통%조력계수%마찰모산
sea surface roughness%tropical cyclone%tropical cyclone structure and intensity%drag coefficient%numerical model
A new parameterization scheme of sea surface momentum roughness length for all wind regimes, including high winds, under tropical cyclone （TC） conditions is constructed based on measurements from Global Positioning System （GPS） dropsonde. It reproduces the observed regime transition, namely, an increase of the drag coefficient with an increase in wind speed up to 40 m s-1 , followed by a decrease with a further increase in wind speed. The effect of this parameterization on the structure and intensity of TCs is evaluated using a newly developed numerical model, TCM4. The results show that the final intensity is increased by 10.5% （8.9%） in the maximum surface wind speed and by 8.1 hPa （5.9 hPa） in the minimum sea surface pressure drop with （without） dissipative heating. This intensity increase is found to be due mainly to the reduced frictional dissipation in the surface layer and little to do with either the surface enthalpy flux or latent heat release in the eyewall convection. The effect of the new parameterization on the storm structure is found to be insignificant and occurs only in the inner core region with the increase in tangential winds in the eyewall and the increase in temperature anomalies in the eye. This is because the difference in drag coefficient appears only in a small area under the eyewall. Implications of the results are briefly discussed.
