The Cross-Equatorial Northerly Surge over the Maritime Continent and Its Relationship to Precipitation Patterns
The Cross-Equatorial Northerly Surge over the Maritime Continent and Its Relationship to Precipitation Patterns
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DOI：
10.2151/jmsj.2011-a02
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发表时间：
2011-02-01
影响因子：
3.1
通讯作者：
Matsumoto, Jun
中科院分区：
文献类型：
--
作者：
Hattori, Miki;Mori, Shuichi;Matsumoto, Jun
本文描述了越赤道北风涌浪(CENS)的特征及其与海洋大陆降水类型的关系。根据QuikSCAT海面风场资料，将本研究的中心定义为超过5m的S(-1)，超过105°E-115°E，5度S EQ的面平均北风。从2000年12月至2009年3月的10个冬季，共提取了62个CENS事件，其中11个事件与寒潮有关，称为CS型；20个事件与热带季节内变化有关，称为MJO；16个事件既与寒潮有关，又与热带季节内变化有关，称为CS MJO；另外15个事件与这些类型无关。在CS型中，出现了冷涌的发展和消散过程，爪哇岛以北的降水增加明显。在MJO型中，S低压附近10度左右的大范围偏北风持续的时间比CS型长，且苏门答腊岛以西和爪哇以南的降水增加明显。CS MJO型表现出CS和MJO型的偏北风场特征，并与这三种型在海洋大陆，特别是爪哇西北部和爪哇南北的降水增加幅度最大有关。与气候平均相比，CENS的产生是导致该地区降水异常扩大的重要环境因素。
This study describes the characteristics of the cross-equatorial northerly surge (CENS), a northerly flow that appears intermittently over the equatorial region between October and April, and its relationship to the precipitation patterns over the Maritime Continent. The CENS in this study was defined as the area-averaged northerly wind exceeding 5 m s(-1) over 105 degrees E-115 degrees E, 5 degrees S-EQ based on the QuikSCAT sea surface wind data. During the 10 winters from December 2000 to March 2009, 62 CENS events were extracted and classified into the following patterns: 11 events were associated with cold surges and termed the CS pattern; 20 events were associated with tropical intra-seasonal variations and termed the MJO pattern; 16 events were associated with both cold surges and tropical intra-seasonal variations and termed the CS MJO pattern; and other 15 events were not associated with these patterns. In the CS pattern, the development and dissipation processes of the cold surge appeared, and the increased precipitation to the north of the island of Java was significant. In the MJO pattern, a wide area of northerly winds in the vicinity of the depression around 10 degrees S continued for a longer period than in the CS pattern, and the increased precipitation west of Sumatra and south of Java was significant. The CS MJO pattern showed features of the northerly wind fields of both the CS and MJO patterns and was associated with the greatest increase in precipitation of the three patterns in the Maritime Continent, in particular, in northwestern Java and both north and south of Java. The generation of CENS was an important environmental factor for inducing the wide positive precipitation anomaly compared to the climatological mean over the Maritime Continent.