2.3.4 hurricane对maximum sustained风速的定位*V1另一篇是写风暴眼的，研究比较了风暴眼外围和中心的强度（storm wall& storm eye）， 有题问到有个房子在16th floor story?处在什么情况下其窗户最容易被风broken。我记得好像选了200mile那个 V2 P1: 过去对hurricane风速的研究使用的方法只能测量flight level的风速（1600 feet高度），后来一种新的技术（貌似是可以卫星定位之类的）可以测量相对ground level的风速。这里涉及到2部分风速的测量，near the eye & out of the eye，对于near the eye，max通常发生在一个XX高度，而对于out of the eye则发生在更高处。其中说到一个例子，说near the eye30层高处比地面处风速快20miles/h（有题）。然后说地面相对于高空风速，near the eye地面是高空的90%，out of the eye地面是高空的78% P2: 但是新的研究得到的结论也如何如何不特别有效，还有很多其他factors也会影响风速（有题）
补充背景信息 GOOGLE上发现没有原文。这里贴出来一小段是跟原文由关的，就当不充背景知识吧，原文除了这段还写了不通高度不同距离之间风速的区别；一下是GOOGLE的背景资料： Since 1997, forecasters have used Global Positioning System dropwindsondes, a measuring device dropped from hurricane reconnaissance aircraft into the eyewall—the windiest part of the hurricane. The sonde system measures temperature, barometric pressure, water vapor, and wind data every 15 feet on its way down. This new method gave meteorologists an important glimpse into the true strength of these devastating storms. The analyses of the dropwindsonde data indicated that, on average, the maximum sustained surface-wind speed was about 90 percent of the wind speed measured at the 10,000-foot aircraft level flown as Andrew approached south Florida. In 1992 Andrew's wind speed was estimated at 75 to 80 percent of the aircraft observations. The research findings resulted in an increase in the estimated wind speeds of Hurricane Andrew from 145 mph to 165 mph.
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发表于 2011-12-13 01:45:27
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