误差订正是提高模式模拟和预报性能的有效方法。基于CWRF(regional Climate-Weather Research and Forecasting model)25套不同物理参数化方案的日降水量模拟资料,对比仅进行降水日数订正(OCD)、仅进行降水量订正(OCM)和先订正降水日数...误差订正是提高模式模拟和预报性能的有效方法。基于CWRF(regional Climate-Weather Research and Forecasting model)25套不同物理参数化方案的日降水量模拟资料,对比仅进行降水日数订正(OCD)、仅进行降水量订正(OCM)和先订正降水日数再订正降水量(COR)三种订正方法,先订正再等权重集成和先等权重集成再订正两种订正思路,重点对1997—2015年华中和华南地区夏季日降水进行订正效果的对比。结果表明:(1)降水日的订正是必要的,综合而言COR方法对CWRF模式日降水的订正效果更佳,尤其是小量级降水,但降水强度的表现不如OCM;(2)先集成后订正的效果更好;(3)CWRF模式不同参数化方案对日降水的模拟能力有显著差别,经过订正后模拟能力均有所提升,但对于不同的模拟方案,其订正效果也不同。表明,误差订正确实能有效提高模式模拟及预报性能,但其效果存在不确定性。提高模式的预报性能,关键还是提高模式对真实大气动力学的表述能力。展开更多
In this study,six intensity forecast guidance techniques from the East China Regional Meteorological Center are verified for the 2008 and 2009 typhoon seasons through an alternative forecast verification technique.Thi...In this study,six intensity forecast guidance techniques from the East China Regional Meteorological Center are verified for the 2008 and 2009 typhoon seasons through an alternative forecast verification technique.This technique is used to verify intensity forecasts if those forecasts call for a typhoon to dissipate or if the real typhoon dissipates.Using a contingency table,skill scores,chance,and probabilities are computed.It is shown that the skill of the six tropical cyclone intensity guidance techniques was highest for the 12-h forecasts,while the lowest skill of all the six models did not occur in 72-h forecasting.For both the 2008 and 2009 seasons,the average probabilities of the forecast intensity having a small error(6 m s-1) tended to decrease steadily.Some of the intensity forecasts had small skill scores,but the associated probabilities of the forecast intensity errors > 15 m s-1 were not the highest.展开更多
文摘误差订正是提高模式模拟和预报性能的有效方法。基于CWRF(regional Climate-Weather Research and Forecasting model)25套不同物理参数化方案的日降水量模拟资料,对比仅进行降水日数订正(OCD)、仅进行降水量订正(OCM)和先订正降水日数再订正降水量(COR)三种订正方法,先订正再等权重集成和先等权重集成再订正两种订正思路,重点对1997—2015年华中和华南地区夏季日降水进行订正效果的对比。结果表明:(1)降水日的订正是必要的,综合而言COR方法对CWRF模式日降水的订正效果更佳,尤其是小量级降水,但降水强度的表现不如OCM;(2)先集成后订正的效果更好;(3)CWRF模式不同参数化方案对日降水的模拟能力有显著差别,经过订正后模拟能力均有所提升,但对于不同的模拟方案,其订正效果也不同。表明,误差订正确实能有效提高模式模拟及预报性能,但其效果存在不确定性。提高模式的预报性能,关键还是提高模式对真实大气动力学的表述能力。
基金supported by the National Basic Research Program of China (2009CB421505)the Shanghai Typhoon Foundation (2009ST09)+1 种基金the National Natural Science Foundation of China (40775060)the Program of China Mete-orological Administration (GYHY201006008 and GYHY200906002)
文摘In this study,six intensity forecast guidance techniques from the East China Regional Meteorological Center are verified for the 2008 and 2009 typhoon seasons through an alternative forecast verification technique.This technique is used to verify intensity forecasts if those forecasts call for a typhoon to dissipate or if the real typhoon dissipates.Using a contingency table,skill scores,chance,and probabilities are computed.It is shown that the skill of the six tropical cyclone intensity guidance techniques was highest for the 12-h forecasts,while the lowest skill of all the six models did not occur in 72-h forecasting.For both the 2008 and 2009 seasons,the average probabilities of the forecast intensity having a small error(6 m s-1) tended to decrease steadily.Some of the intensity forecasts had small skill scores,but the associated probabilities of the forecast intensity errors > 15 m s-1 were not the highest.
