摘要
应用ＩＡＰ２－ＬＡＧＣＭ模式，并考虑了下垫面异常，模拟了长江中下游盛夏不同强度的持续性地表高温干旱对短期天气的影响．结果表明，这种持续性高温干旱对长江中下游及我国东南沿海短期降水有十分明显的影响，持续高温干旱的强度不同，其影响结果不同．持续性适度高温和严重干旱造成短期降水减少，高温干旱仍继续维持达１个月的正反馈过程．在此持续过程中，土壤湿度变化起主导作用，而土壤热力状况的影响相对较小．
he effect of persistent high temperature and drought (PHTD) with different intensities on the shortterm precipitation is simulated using IAP 2L AGCM model with anomalies of underlying surface. The studied area covers the middle and lower reaches of the Yangtze River and the selected temperature data are limited to the midsummer time. It has been found that the PHTD affects the precipitation in the middle and lower reaches of the Yangtze River and southeastern coast of China significantly. The extent affected is differentiated by various intensities of PHTD. The results also show that the surface suitable high temperature and lowerhumidity in the test area lead to the decreasing of short term precipitation and persistent high temperature and drovgh for about one month. The dominant factor is the variation of soil moisture rather than the soil thermodynamic properties in the positive feedback process.
出处
《应用气象学报》
CSCD
北大核心
1998年第3期283-290,共8页
Journal of Applied Meteorological Science
关键词
持续高温
干旱
土壤温度异常
短期降水
数值试验
Persistent high temperature and drought Soil temperature anomaly Soil humidity anomaly Short term precipitation
