How much Northern Hemisphere precipitation is associated with extratropical cyclones?
How much Northern Hemisphere precipitation is associated with extratropical cyclones?
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DOI：
10.1029/2012gl053866
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发表时间：
2012-12-22
影响因子：
5.2
通讯作者：
Dacre, H. F.
中科院分区：
文献类型：
--
作者：
Hawcroft, M. K.;Shaffrey, L. C.;Dacre, H. F.
热带气旋通常与强降水事件有关，并可能产生重大的社会经济影响。这项研究调查了北方半球总降水量中有多少与热带气旋有关。一个客观的特征跟踪算法被用来定位气旋和与这些气旋相关的降水量被量化，以建立它们对总降水量的贡献。气候资料来自全球降水气候学项目（GPCP）每日数据集和ERA中期再分析。气旋相关降水的大小和空间分布及其占总降水的百分比在两个数据集中非常相似。在某些地区，热带气旋的贡献超过90/85%的总DJF/JJA降水气候学。最强降水风暴对总降水的相对贡献在DJF大于JJA。最强烈的降水10%的风暴贡献了20%以上的总风暴相关降水在DJF，而他们提供了不到15%的这一总数在JJA。引用：Hawcroft，M. K.，L. C. Shaffrey，K. I. Hodges和H. F. Dacre（2012），有多少北方半球降水与热带气旋有关？，地球物理学家。保留信函：39，L24809，doi：10.1029/2012GL053866。
Extratropical cyclones are often associated with heavy precipitation events and can have major socio-economic impacts. This study investigates how much of the total precipitation in the Northern Hemisphere is associated with extratropical cyclones. An objective feature tracking algorithm is used to locate cyclones and the precipitation associated with these cyclones is quantified to establish their contribution to total precipitation. Climatologies are produced from the Global Precipitation Climatology Project (GPCP) daily dataset and the ERA-Interim reanalysis. The magnitude and spatial distribution of cyclone associated precipitation and their percentage contribution to total precipitation is closely comparable in both datasets. In some regions, the contribution of extratropical cyclones exceeds 90/85% of the total DJF/JJA precipitation climatology. The relative contribution of the most intensely precipitating storms to total precipitation is greater in DJF than JJA. The most intensely precipitating 10% of storms contribute over 20% of total storm associated precipitation in DJF, whereas they provide less than 15% of this total in JJA. Citation: Hawcroft, M. K., L. C. Shaffrey, K. I. Hodges, and H. F. Dacre (2012), How much Northern Hemisphere precipitation is associated with extratropical cyclones?, Geophys. Res. Lett., 39, L24809, doi: 10.1029/2012GL053866.