關于沙塵暴的英語作文 Sand Storm

　　In general, the sandstorm refers to carry large amounts of dust storm, tend to occur in the desert or semi-arid areas. But have strict scientific sense of the sandstorm. Weather in general with visibility to differentiate between the sand and dust storm: visibility less than 1 km to dust storms, visibility 1 km in more for dust or flying sand weather.

　　Experts with the China environmental testing station with the concentration of suspended particles in the air as a measure. Recently suspended particle concentration dust weather in Beijing general not more than 1000 micrograms per cubic metre, and dust concentration is far more than the index.

　　The expert points out, should distinguish between dust, flying sand and dust, etc. Three kinds of common weather conditions. Dust weather, diffuse tiny particles in the atmosphere, dust from outside, the flying sand weather of sand is local. Dust and flying sand dust weather with the two kinds of weather conditions, but the ratio of the two are changed. Dust weather as part of the index, can only be called a sandstorm.

　　一般而言，沙塵暴是指攜帶大量塵沙的風暴，多發生在沙漠或半干旱地區。但科學意義上的沙塵暴卻有嚴格的指標。氣象上一般以能見度來區分沙塵與沙塵暴：能見度小于1公里的為沙塵暴，能見度在1公里以上的為沙塵或揚沙天氣。

　　中國環境檢測總站的專家們則以空氣中懸浮顆粒物的濃度作為衡量指標。最近北京沙塵天氣時懸浮顆粒物濃度每立方米一般不超過1000微克，而沙塵暴時的濃度是要遠遠超過這個指標的。

　　專家指出，應該區分浮塵、揚沙和沙塵等3種常見天氣情況。浮塵天氣時，大氣中彌漫細小顆粒物，灰塵多由外地而來，揚沙天氣卷起的沙土則完全是本地產生的。沙塵天氣兼有浮塵和揚沙兩種天氣情況，不過二者所占的比重有變化。沙塵天氣達到一定的指標，才可稱作沙塵暴。

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