Signature of the Contemporary Southwestern North American Megadrought in Mesopause Region Wave Activity
Signature of the Contemporary Southwestern North American Megadrought in Mesopause Region Wave Activity
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DOI：
10.1029/2022gl100569
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
C. Gardner;C. She
中科院分区：
文献类型：
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作者：
C. Gardner;C. She
北美西南部的大干旱始于2000年，现在被认为是该地区自公元800年以来最干旱的22年。在特大暴雨期间的降水不足（2000-2021年期间为8.3%）伴随着高层大气中观测到的重力波的显著减少。在干旱之前（1990-2000年），平均波驱动的温度波动变化，在85和100公里之间的阿尔伯克基和英尺。柯林斯，具有可比性（分别为62.2 ± 5.3 K2和60.5 ± 1.8 K2），最大的变化发生在冬季和夏季风暴季节。在干旱的第一个十年（2001-2010年），波活动以上英尺。柯林斯减少28 ± 3%，主要在94 km以上，并从主要的半年变化到主要的一年变化。这些变化可能与大暴雨期间对流层风暴产生的波浪减少以及美国西部和中西部降水事件的地理分布改变有关。
The Southwestern North American megadrought began in 2000 and is now believed to be the driest 22‐year period in the region since 800 CE. The precipitation deficit during the megadrought (8.3% during 2000–2021) has been accompanied by a significant decrease in gravity waves observed in the upper atmosphere. Prior to the drought (1990–2000), the mean wave‐driven temperature fluctuation variances, between 85 and 100 km at Albuquerque and Ft. Collins, were comparable (62.2 ± 5.3 K2 and 60.5 ± 1.8 K2, respectively), with the largest variances occurring during winter and summer storm seasons. During the first decade of the drought (2001–2010), wave activity above Ft. Collins decreased by 28 ± 3%, mostly above 94 km, and changed from primarily semiannual to primarily annual variations. These changes may be related to reduced wave generation by tropospheric storms during the megadrought and to an altered geographic distribution of precipitation events in the western and mid‐western United States.