Modulation of Caribbean Precipitation by the Madden–Julian Oscillation
Modulation of Caribbean Precipitation by the Madden–Julian Oscillation
复制标题
马登-朱利安振荡对加勒比降水的调节
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Schumacher
中科院分区：
文献类型：
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作者：
E. Martin;C. Schumacher
摘要根据12年逐日卫星降水资料和再分析风，加勒比降水的季节内(30-90天)变化与马登-朱利安振荡(MJO)的相位有关。季节内变率在9-11月(SON)最大，但MJO对降水的一些调制在所有季节都出现。在MJO的第1和第2阶段(第5和第6阶段)，观测到的降水异常高(低于)年平均值的50%。与MJO有关的加勒比降水的变化被证明与低层(925百帕)风的变化有关。当降水异常在第1和第2阶段(第5和第6阶段)高于(低于)平均水平时，风异常将减弱(增加)盛行的东风信风的强度。低层风的变化在加勒比海低空急流(CLLJ)区域最为明显，与CLLJ进出口区相关的散度异常先于降水异常。那个.。
Abstract Based on 12 years of daily satellite precipitation data and reanalysis winds, intraseasonal (30–90 days) variability in Caribbean precipitation is linked to phases of the Madden–Julian oscillation (MJO). Intraseasonal variability is largest during September–November (SON), but some modulation of precipitation by the MJO appears throughout all seasons. Precipitation anomalies up to 50% above (below) the annual mean are observed in phases 1 and 2 (5 and 6) of the MJO. The changes in Caribbean precipitation associated with the MJO are shown to be related to changes in the low-level (925 hPa) winds. When precipitation anomalies are above (below) average in phases 1 and 2 (5 and 6), wind anomalies act to decrease (increase) the strength of the prevailing easterly trade winds. The changes in the low-level winds are most apparent in the region of the Caribbean low-level jet (CLLJ), and divergence anomalies associated with the entrance and exit regions of the CLLJ precede the precipitation anomalies. The...