Precipitation Associated with Convergence Lines
作者： Evan Weller , Kay Shelton , Michael J. Reeder , Christian Jakob
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摘要: Precipitation is often organized along coherent lines of low-level convergence, which at longer time and space scales form well-known convergence zones over the world’s oceans. Here, an automated, objective method used to identify instantaneous in reanalysis data calculate their frequency for period 1979–2013. Identified are combined with precipitation observations assess extent around globe associated lower troposphere. It shown that a large percentage (between 65% 90%) tropical oceans such lines, regional variations up 30% throughout year, especially eastern Pacific Atlantic Oceans. Over land, annual-mean proportion ranges between 60%, lowest proportions (less than 15%) occur on flank subtropical highs. Overall, much greater long (greater 300 km length) shorter fragmented km), majority occurs land. The not any line primarily where both low. high temporal spatial resolution climatology constructed also enables examination diurnal cycle relationship precipitation. Here example provided Maritime Continent region.
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