Journal of Arid Meteorology ›› 2021, Vol. 39 ›› Issue (5): 717-726.DOI: 10.11755/j.issn.1006-7639(2021)-05-0717
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LIU Shuyan1(),RONG Yanshu1(),LYU Xingyue1,2,YIN Yuting1
Received:
2021-06-15
Revised:
2021-07-30
Online:
2021-10-30
Published:
2021-11-08
Contact:
Yanshu RONG
通讯作者:
荣艳淑
作者简介:
刘书言(1997— ),女,硕士生,主要从事水文气象研究. E-mail: 基金资助:
CLC Number:
LIU Shuyan, RONG Yanshu, LYU Xingyue, YIN Yuting. Comparative Analysis of Drought in China and the United States in 2012[J]. Journal of Arid Meteorology, 2021, 39(5): 717-726.
刘书言, 荣艳淑, 吕星月, 殷雨婷. 2012年中美两国干旱的对比分析[J]. 干旱气象, 2021, 39(5): 717-726.
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URL: http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2021)-05-0717
等级 | 类型 | SPI |
---|---|---|
0 | 无旱 | SPI>-0.5 |
1 | 轻旱 | -1.0<SPI ≤-0.5 |
2 | 中旱 | -1.5<SPI ≤-1.0 |
3 | 重旱 | -2.0<SPI ≤-1.5 |
4 | 特旱 | SPI ≤-2.0 |
Tab.1 The classification standard of drought grades based on standardized precipitation index
等级 | 类型 | SPI |
---|---|---|
0 | 无旱 | SPI>-0.5 |
1 | 轻旱 | -1.0<SPI ≤-0.5 |
2 | 中旱 | -1.5<SPI ≤-1.0 |
3 | 重旱 | -2.0<SPI ≤-1.5 |
4 | 特旱 | SPI ≤-2.0 |
Fig.2 The monthly changes of percentage of drought area in China and the United States in 2012 (a) percentage of total drought area, (b) percentage of drought area with different grades
Fig.3 Comparison of drought intensity between China and the United States in each month of 2012 (a) regional average SPI, (b) average SPI with different grades
Fig.4 The inter-annual change of average temperature in China and the United States during 1961-2012 (a) and annual average temperature anomaly in several large regions of China (b) and the United States (c) in 2012
Fig.5 The monthly change of Niño3.4 index (a) and longitude-time section of average SST anomaly in the equatorial Pacific (5°S-5°N) (b, Unit: ℃) from 2010 to 2012
Fig.6 The meridional vertical sections of composition (vectors) of average meridional wind (Unit: m·s-1) and vertical velocity (Unit: 10-2 Pa·s-1) and vertical velocity anomaly (shadows, Unit: 10-2 Pa·s-1) over China in each season from 2011 to 2012 (a) winter of 2011 to 2012, (b) spring of 2012, (c) summer of 2012, (d) autumn of 2012
Fig.7 The meridional vertical sections of composition (vectors) of average meridional wind (Unit: m·s-1) and vertical velocity (Unit: 10-2 Pa·s-1) and vertical velocity anomaly (shadows, Unit: 10-2 Pa·s-1) over the United States in each season from 2011 to 2012 (a) winter of 2011 to 2012, (b) spring of 2012, (c) summer of 2012, (d) autumn of 2012
Fig.8 The distribution of 850 hPa geopotential height field (contours) and its anomaly (shadows) from 2011 to 2012 (Unit: gpm) (the orange dotted lines with 1520 gpm for the average location of the subtropical high) (a) winter of 2011 to 2012, (b) spring of 2012, (c) summer of 2012, (d) autumn of 2012
Fig.9 The monthly changes of anomalies of the western Pacific subtropical high index and North American-North Atlantic subtropical high index in 2012 (a) area index, (b) intensity index, (c) northern boundary position index, (d) western extension ridge point index
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