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昨天,一场堪称近十年最强沙尘暴席卷我国北方大部分城市。此次沙尘天气覆盖面非常广,包括新疆、内蒙古、甘肃、宁夏、陕西、山西、河北、北京、天津、黑龙江、吉林、辽宁等
12 省市都笼罩在沙尘之中。
据报道,中国气象局环境气象中心主任张碧辉表示,此次大范围沙尘主要有以下两方面原因。
一方面因为前期整个蒙古国,包括我国西北地区气温偏高明显,普遍偏高5-8 摄氏度,外蒙古大部分地区近期降水比较稀少,地表条件非常有利于沙尘天气的发生。
第二个方面是受较强的蒙古气旋的影响,从新疆北部、甘肃中西部、内蒙古大部,包括华北北部这些地区,都先后出现了六到八级的阵风天气,为这次沙尘天气的发生,提供了非常好的热力和动力条件。
央视主播海霞表示,这次沙尘天气来得突然,既有气象因素的偶然叠加,也反映出治沙这件事的必然逻辑。
首先是偶然。大量的沙子被狂风卷起,再被冷空气带到远方,这就是咱们今天看到的这场沙尘暴。沙源、气旋和平流运动是沙尘暴形成的三要素,这次沙尘天气碰巧同时满足了这三个条件。
专家表示,这种情况并不多见,也不会成为常态,大家不必过分担心。
当然,仍有人感到疑惑:咱们防沙治沙这么多年,为啥还没能挡住近十年来最强的沙尘暴?
其实,主要问题并不出在中国的“林”,而是出在全球的“沙”。
说到底,治沙的根本在于源头治理,更要靠全球携起手来,只“办好自己的事”是远远不够的。近年来,越来越多的事例表明,“全球的事还得靠全球携手才能办成”,治沙就是如此。
中国的“林”虽然挡不住全球的“沙”,但中国的经验可以帮助治理全球的“沙”。中国治沙经验的推广仍需时日,在这个方面,咱们任重而道远,需要全球携手合作。