“气温分布”教学过程设计

【第一课时气温分布】搭脚手架:师:大家知道气温几度时你会感觉到热、冷或比较舒适呢?生:讨论。师:实验表明,夏季,人们感到最舒适的气温是19-24℃,冬季是17-22℃。一般要超过26度会感觉热,而热到连T恤都不想穿,那就至少要35度左右。进入情境:播放全国主要城市"天气预报"。     

Temporal and spatial changes of temperature and precipitation in Hexi Corridor during 1955–2011

This study is focused on the northwestern part of Gansu Province, namely the Hexi Corridor. The aim is to address the question of whether any trend in the annual and monthly series of temperature and precipitation during the period 1955-2011 appears at the scale of this region. The temperature and precipitation variation and abrupt change were examined by means of linear regression, five-year moving average, non-parameter Mann-Kendall test, accumulated variance analysis and Pettitt test method. Conclusions provide evidence of warming and wetting across the Hexi Corridor. The mean annual temperature in Hexi Corridor increased significantly in recent 57 years, and the increasing rate was 0.27℃/10a. The abrupt change phenomenon of the annual temperature was detected mainly in 1986. The seasonal average temperature in this region exhibited an evident upward trend and the uptrend rate for the standard value of winter temperature indicated the largerst of four seasons. The annual precipitation in the Hexi Corridor area displayed an obviously increasing trend and the uptrend rate was 3.95 mm/10a. However, the annual precipitation in each basin of the Hexi Corridor area did not passed the significance test. The rainy season precipitation fluctuating as same as the annual one presented insignificant uptrend. No consistent abrupt change was detected in precipitation in this study area, but the rainy season precipitation abrupt change was mainly observed in 1968.     

对一道夜雨试题的思考

正题目(2013年高考浙江卷第7题)拉萨河流域拥有丰富的物质文化和非物质文化资源,拉萨位于宽阔的拉萨河谷地北侧。下图为拉萨7月降水量日平均变化图。7.有关拉萨7月降水日变化成因的叙述,正确的是A.夜晚地面降温迅速,近地面水汽易凝结成雨B.夜晚近地面形成逆温层,水汽易凝结成雨C.白天盛行下沉气流,水汽不易凝结成雨D.白天升温迅速,盛行上升气流,水汽不易凝结