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利用高分辨率中尺度模式和地基GPS资料构造高时空分辨率的大气湿度廓线
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摘要
预报强对流天气潜势的关键问题之一是了解大气的垂直稳定度和垂直风切变。目前预报员获取有关大气垂直稳定度和垂直风切变信息的主要方法是检验探空曲线。但现有的探空站网其时空密度无法提供足够详细的大气信息以指示发生强对流天气的潜势,而中尺度数值模式则可以输出高时空分辨率的各种模式变量,提供高时空分辨率的大气温湿风垂直廓线。主要问题是模式的温湿风廓线是否可靠。
    利用北京2004年6月、7月和8月的加密探测资料,考察北京气象局3km分辨率的中尺度数值模式MM5对北京地区夏季对流发生的诊断分析能力,进行预报检验分析,估计模式温湿风垂直廓线和根据它们计算的对流诊断参数的可靠性。结果表明:模式模拟的各种大气廓线中,风廓线和温度廓线都具有一定的参考价值,但在廓线出现转折的地方,如:逆温层和风向转折时,模式预报较差。露点(湿度)廓线的预报误差较大,不能反映出真实水汽场的分布。模式预报的深层(地面~500hPa)垂直风切变与探空具有较好的一致性,而模式给出的对流有效位能CAPE由于温度和露点预报结果不理想,其值与实际偏差较大。因此模式输出的对流有效位能CAPE必须经过适当订正才能用于诊断强对流天气发生的可能性。
    为订正大气模式预报的湿度廓线和对流参数CAPE值,本文利用探空的水汽总量和GPS层析的水汽资料对模式大气湿度廓线和CAPE值进行了订正。分别直接利用探空水汽总量、迭代法利用探空水汽总量、利用GPS层析水汽资料做了三种订正试验。结果表明,三种方法的效果成依次递增。直接利用探空水汽总量对模式预报的水汽廓线进行订正,模式水汽廓线订正后效果反而变差,由于模式预报的水汽分布不够合理,单纯对模式的水汽总量进行量值调整,而不改变模式水汽分布,会使水汽比实际偏大,从而导致CAPE值异常偏大。采取迭代法进行探空水汽总量订正后,采取逐层订正,并以模式预报的饱和比湿加以限制,湿度信息不再异常增大,订正后的CAPE值比直接订正的效果好,而且CAPE值的量值变化和这段时间大气实际观测的CAPE变化趋势相同,但是在CAPE值的预报数值还是不够准确。直接采用GPS层析技术得出的水汽密度廓线对模式预报进行订正,比湿廓线水汽变化趋势更接近实况,由此订正出来的CAPE值量值也更为接近,CAPE值的订正效果比前两种方法都好。
To forecast the strong convection weather, one of the key problems is to find out theatmospheric vertical stability and wind shear. Now for forecasters, checking the radiosondeobservation is the usual way to obtain information about the atmospheric vertical stability andwind shear. But the spatial and time resolution of the present radiosonde network cannotprovide sufficiently detailed information to indicate the possible appearance of the strongconvective weather. On the other hand, the Mesoscale Numerical Model is able to output allkinds of model variables with high resolution, and furthermore, provide the atmospherictemperature and humidity vertical profiles with high spatial and time resolution. The keyproblem is whether or these profiles are reliable .
    Using the high resolution radiosonde data of Beijing in June , July, and August , 2004, themesoscale numerical model MM5 with a resolution of 3km of Beijing meteorological bureau ischecked to show its diagnosis ability for the possible occurrence of the convective weather insummer of Beijing, the reliability of the atmospheric temperature and humidity vertical profilesobtained from the numerical model as well as the convection diagnosis parameters which arecalculated from these profiles are estimated. Results show: in all kinds of atmospheric profilesobtained from the numerical model, the wind shear and temperature profiles both are valuableto some extent,while at the location where the profiles show a transition such as an temperatureinversion or a wind direction transition the simulation results are much poorer. The dew pointprofile show large error which cannot reflect the real distribution of the humidity field. Thevertical wind shear of the forecasting deep layer (from ground to 500hpa) shows a relative goodconsistence with the radiosonde observation, while the calculated CAPE value have largedifference with the real value because of the imperfect forecasting results of the temperature andhumidity . The CAPE value must be properly revised in order to diagnose the potential forecastof the strong convection weather.
     This paper make use of the integrated precipitation water vapor of radiosonde andtomography vapor data of GPS to modify the humidity vertical profile and CAPE valueobtained from the model. Using the integrated precipitation water (PW) of radiosonde, theiterative PW data of radiosonde, and tomography vapor data of GPS respectively, we carry onthree numerical tests. Results show: The efficiency of these three methods is ascending in turn.
    For the method directly using the radiosonde PW, the efficiency of the forecasting CAPE iseven worse after being modified, which is because that the forecasting atmospheric humiditydistribution is imperfect so that only by modifying the model's PW but not changing thehumidity distribution, the vapor may be larger than the real value and furthermore, and makethe CAPE value larger exceptionally. For the method using the iterative way to carry out thePW modification, due to carry on the modification layer by layer and make a limit for saturationspecific humidity (qs) by the forecasting results so that the humidity cannot increaseexceptionally, the CAPE value becomes much better than the direct method, while its variabletrend is consistence with the observation value and the error decreases a lot, but the forecastingnumerical CAPE value still does not has sufficient accuracy. Finally, directly using thetomography vapor density data of GPS to modify the model, the modified humidity profilebecomes further closer to the observation and the modified CAPE value becomes closer to theobservation either, which indicate that the effect of the modification for the CAPE value isbetter than the previous two methods.
引文
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