0801号台风“浣熊”的路径和强度特征分析

利用一天四次的NECP格点再分析资料对台风的移动路径、强度突变进行分析。结果表明:台风"浣熊"的移动路径与副高位置的演变有关,而西风槽、脊的进退直接影响副高的演变。因此,副热带高压与西风槽、脊的相互作用是台风"浣熊"路径在北纬20度从西北偏北转向东北的原因;弱冷空气、东亚大槽槽前正涡度平流所产生的强辐散场是强度突变的重要原因;除此之外,越赤道气流与副热带高压的共同作用,不仅对台风"浣熊"强度突变有作用,同时也是其路径在南海从西北偏西转向西北偏北的原因。

Analysis of Track and Intensity of Typhoon Noguri (0801)

Based on the NCEP reanalysis data,the moving track and intensity of the 0801 typhoon Neoguri were analyzed.The result shows that Neoguri's track has a close relation to subtropical high.The movement of westerly trough and high ridge influence the subtropical high directly.The interaction between subtropical high and westly trough basically cause Neoguri to turn from west-northwest to northeast;The strong divergence in upper troposphere induced by positive vortices in front of East Asia Trough and the low level weak cold air are both the most important reasons for Neoguri's intensity sudden change.In addition,the joint influence of subtropical high and cross-equatorial flow also gives an impact on Neoguri's intensity and movement.