以0505号强台风"海棠"为例,利用"侵台台风之飞机侦察及下投式探空仪观测实验"(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region,DOTSTAR)提供的高垂直分辨率GPS下投式探空仪(Dropsonde)...以0505号强台风"海棠"为例,利用"侵台台风之飞机侦察及下投式探空仪观测实验"(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region,DOTSTAR)提供的高垂直分辨率GPS下投式探空仪(Dropsonde)观测资料,研究和比较了2次观测时段"海棠"的动力及热力结构差异,结果表明,第2次观测时的"海棠"在气旋式入流的强度和范围、高层暖区的强度和范围等方面均较第1次明显增强和扩大,且"海棠"环流的顶层发展出了一定强度和厚度的反气旋出流,加上"海棠"逐步移入高海温区和处于有利的弱垂直风切变环境中,"海棠"进一步增强;其次,用该观测资料对Frank等1999和2001年的数值模拟结果(垂直风切变通过激发热带气旋眼墙内部垂直运动的一波不对称结构而导致热带气旋结构的不对称分布)进行了验证。结果表明,观测分析结果与Frank等的数值模拟结果能较好地吻合,解释了环境垂直风切变对台风不对称结构的可能影响。展开更多
"龙王"台风是2005年登陆中国的典型强台风。在海上观测资料较为稀缺的情况下,应用DOTSTAR(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region)对"龙王"不同发展时段的两次GPS Dropsonde观..."龙王"台风是2005年登陆中国的典型强台风。在海上观测资料较为稀缺的情况下,应用DOTSTAR(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region)对"龙王"不同发展时段的两次GPS Dropsonde观测资料,对其动力、热力及非对称结构的变化情况进行分析。结果表明,第二次观测到的"龙王"无论在动力结构还是在热力结构上都较第一次观测有所发展,显示"龙王"强度压缩增强。进一步研究表明,环境垂直风切变是造成台风结构不对称分布的主要原因,较大的垂直风切变不但导致台风产生明显的非对称性结构,而且不利于台风的进一步增强。展开更多
There was a new concept of ‘adaptive or targeting observation’ in recent years, which is anadditional and targeting observation based on the existing and fixed observing network for the atmosphere on theimpacted reg...There was a new concept of ‘adaptive or targeting observation’ in recent years, which is anadditional and targeting observation based on the existing and fixed observing network for the atmosphere on theimpacted region. Dropsonde is one of the important observing instruments in the adaptive or targetingobservation. In this paper, GRAPES, the next generation of numerical weather prediction system of China hasbeen used. The impacts on the typhoon Dujuan (No.200315) forecast in experiments with dropsonde have beenstudied and experiments on sensitivity have also been done. It was found that the forecasts of the elements havebeen improved obviously with the use of dropsonde, such as the path, the center location, and the intensity oftyphoon. It was also found in the sensitivity studies that the setting of deviation structure also has obviousimpacts on the forecast for typhoons. It is not true that the simulation is better when the proportion of the data ofdropsonde is larger in the course to modify the background.展开更多
文摘以0505号强台风"海棠"为例,利用"侵台台风之飞机侦察及下投式探空仪观测实验"(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region,DOTSTAR)提供的高垂直分辨率GPS下投式探空仪(Dropsonde)观测资料,研究和比较了2次观测时段"海棠"的动力及热力结构差异,结果表明,第2次观测时的"海棠"在气旋式入流的强度和范围、高层暖区的强度和范围等方面均较第1次明显增强和扩大,且"海棠"环流的顶层发展出了一定强度和厚度的反气旋出流,加上"海棠"逐步移入高海温区和处于有利的弱垂直风切变环境中,"海棠"进一步增强;其次,用该观测资料对Frank等1999和2001年的数值模拟结果(垂直风切变通过激发热带气旋眼墙内部垂直运动的一波不对称结构而导致热带气旋结构的不对称分布)进行了验证。结果表明,观测分析结果与Frank等的数值模拟结果能较好地吻合,解释了环境垂直风切变对台风不对称结构的可能影响。
文摘"龙王"台风是2005年登陆中国的典型强台风。在海上观测资料较为稀缺的情况下,应用DOTSTAR(Dropsonde Observations for Typhoon Surveillance near the Taiwan Region)对"龙王"不同发展时段的两次GPS Dropsonde观测资料,对其动力、热力及非对称结构的变化情况进行分析。结果表明,第二次观测到的"龙王"无论在动力结构还是在热力结构上都较第一次观测有所发展,显示"龙王"强度压缩增强。进一步研究表明,环境垂直风切变是造成台风结构不对称分布的主要原因,较大的垂直风切变不但导致台风产生明显的非对称性结构,而且不利于台风的进一步增强。
基金Multiple time levels of Dynamic / Physical Processes with Lagrange Non-hydrostatic GlobalModel and Study on the Coordination of Correlation (40575050)
文摘There was a new concept of ‘adaptive or targeting observation’ in recent years, which is anadditional and targeting observation based on the existing and fixed observing network for the atmosphere on theimpacted region. Dropsonde is one of the important observing instruments in the adaptive or targetingobservation. In this paper, GRAPES, the next generation of numerical weather prediction system of China hasbeen used. The impacts on the typhoon Dujuan (No.200315) forecast in experiments with dropsonde have beenstudied and experiments on sensitivity have also been done. It was found that the forecasts of the elements havebeen improved obviously with the use of dropsonde, such as the path, the center location, and the intensity oftyphoon. It was also found in the sensitivity studies that the setting of deviation structure also has obviousimpacts on the forecast for typhoons. It is not true that the simulation is better when the proportion of the data ofdropsonde is larger in the course to modify the background.
