華山云海的變化特征以及與氣象要素的關(guān)系

doi:10.3969/2018jms.0093

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華山云海的變化特征以及與氣象要素的關(guān)系
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                        10.3969/2018jms.0093
                    
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基金項目:陜西氣象局科技創(chuàng)新基金計劃項目（2015M-40）

Change characteristics of the sea of clouds in Huashan Mountain and the relationship with meteorological elements

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用華山氣象站1985-2014年氣象要素資料，分析近30 a華山云海的變化及云海與降水、相對濕度、風速的關(guān)系。結(jié)果表明，華山年平均云海日為26.27 d，最多年份72 d，最少年份僅3 d；面積<200 km²云海年平均日數(shù)24.23 d；面積≥ 200 km²云海平均日數(shù)2.87 d，最多有20 d（1985、1994年），最少有2 d（1997年），1997年后再沒有面積≥ 200 km²的云海出現(xiàn)。云海的出現(xiàn)呈逐年下降的趨勢，年際差異明顯。秋季云海出現(xiàn)日數(shù)最多（平均云海日數(shù)8.13 d），冬季最少（平均4.60 d）；各月的云海日數(shù)8月最多，5月最少。面積≥ 200 km²云海冬季出現(xiàn)日數(shù)最多，夏季最少；11月出現(xiàn)最多，3、12月次之，5月最少。面積≥ 200 km²云海出現(xiàn)的前一天或當天一般都有降水，兩天中至少有一天出現(xiàn)降水的幾率是84.30%；平均相對濕度≥ 70%時，較易形成云海；云海日出現(xiàn)時常伴有風，但總體風速不大，通?！?10.0 m·s^-1，利于云海的形成保持。

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Based on the data from Huashan Meteorological Station during 1985-2014, this paper analyzed the changes of clouds in Huashan Mountain in the past 30 years and the related weather elements like precipitation, relative humidity and wind speed. It turned out that the annual mean days with the sea of clouds was 26.27 d, the maximum days with the sea of clouds was 72 d, and the minimum was 3 d. In particular, the annual mean days with the area of the sea of clouds ≤ 200 km² was 24.23 d while the days with area ≥ 200 km² was 2.87 d on average, with a maximum of 20 d (in 1985 and 1994) and a minimum of 2 d (in 1997). While no sea of clouds with an area ≥ 200 km² has appeared since 1997. Generally speaking, the occurrence of the sea of clouds shows a descending trend with obvious interannual differences. Days with the sea of clouds tend to occur most in autumn (with average number of 8.13 d) but least in winter (with average number of 4.60 d); specifically, we can see that the number of days with the sea of clouds is the highest in August and the lowest in May. It is interesting to note that the sea of clouds with area ≥ 200 km² appears most in winter but least in summer. Such events appear the most in November, followed by March and December, and the least in May. On the very day or the day before the appearance of the sea of clouds with the area ≥ 200 km², it always tends to rain and the probability is about 84.30%. When the relative humidity is ≥ 70%, it is inclined to form the sea of clouds, and, at that time, the winds blow usually at the speed ≤ 10.0 m·s^-1, which is beneficial to the developing and maintaining of the sea of clouds.

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曹慧萍,達勇,喬舒婷,于進江,沈姣姣,馬磊.華山云海的變化特征以及與氣象要素的關(guān)系.氣象科學,2019,39(5):698-703 CAO Huiping, DA Yong, QIAO Shuting, YU Jinjiang, SHEN Jiaojiao, MA Lei. Change characteristics of the sea of clouds in Huashan Mountain and the relationship with meteorological elements. Journal of the Meteorological Sciences,2019,39(5):698-703

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收稿日期:2016-10-31
最后修改日期:2018-12-12
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在線發(fā)布日期: 2019-11-11
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说