The Maritime Continent (MC) exhibits a pronounced diurnal cycle in precipitation, with many high-resolution models overestimating the diurnal peak and predicting earlier precipitation over the islands than observed. We hypothesize that part of this model bias comes from ignoring precipitation-induced surface sensible heat flux (Q_P). To test this conjecture, we performed simulations with and without Q_P for April 2009 and June 2006. The inclusion of Q_P reduced the bias in diurnal peak precipitation amplitude by 83% in April 2009 and 23% in June 2006. Similarly, the bias in precipitation peak timing decreased by 26% and 15%, respectively. This bias reduction was even more prominent during periods of heavier rainfall. This improvement in both the amplitude and phase of diurnal precipitation also led to a reduction in bias for total precipitation by ∼10%. These findings suggest that Q_P cannot be neglected over the MC, particularly during heavy precipitation.

中文翻译：

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降水诱导的表面感热通量对海洋大陆降水昼夜循环的重要性


海洋大陆 （MC） 表现出明显的降水昼夜周期，许多高分辨率模型高估了昼夜峰值，并预测岛屿上的降水时间早于观测到的。我们假设这种模型偏差的一部分来自于忽略降水诱导的表面敏感热通量 （Q_P）。为了验证这一猜想，我们在 2009 年 4 月和 2006 年 6 月进行了有和没有 Q_P 的模拟。纳入 Q_P 使 2009 年 4 月和 2006 年 6 月日峰值降水幅度的偏差分别降低了 83% 和 23%。同样，降水高峰时间的偏差分别降低了 26% 和 15%。这种偏差减少在降雨量较大的时期更为明显。昼夜降水幅度和相位的改善也导致总降水的偏差减少了约 10%。这些发现表明 Q_P 在 MC 上不容忽视，尤其是在强降水期间。