1981—2018年內(nèi)蒙古不同等級降水時空變化特征

doi:10.12306/2020jms.0090

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1981—2018年內(nèi)蒙古不同等級降水時空變化特征
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                        10.12306/2020jms.0090
                    
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中圖分類號:P426.6
基金項目:國家重點研發(fā)計劃項目(2018YFC1506606);江蘇省優(yōu)秀青年基金項目(BK20170102)

Spatiotemporal variations of different precipitation grades in Inner Mongolia from 1981 to 2018

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基于1981—2018年內(nèi)蒙古地區(qū)103個地面氣象觀測站的逐日降水資料,運用趨勢分析方法,分析近38 a內(nèi)蒙古降水量、降水日數(shù)和降水強度的時空變化特征。結(jié)果表明,不同等級降水量和降水日數(shù)呈現(xiàn)弱減少趨勢,不同等級降水強度年際變化趨勢不明顯,但是濕潤區(qū)的各等級降水年際波動最大,干旱區(qū)的中雨強度年際波動明顯大于其他氣候區(qū)。各等級降水對總降水的貢獻(xiàn)率從大到小依次為小雨、中雨和大雨,但地區(qū)分布不均。各氣候區(qū)小雨日數(shù)貢獻(xiàn)率均在80%~90%,并且小雨量占比從內(nèi)蒙古東北部濕潤區(qū)到西北部的干旱區(qū)逐漸上升。內(nèi)蒙古各等級降水均呈現(xiàn)自東向西遞減的空間分布特征,其中降水量和降水日數(shù)的高值區(qū)主要分布在東北部地區(qū),降水強度的高值區(qū)主要分布在東南部地區(qū)。2010年以來,內(nèi)蒙古東北部和中部偏西地區(qū)的小雨等級的降水量和小雨日數(shù)減少,小雨等級的降水強度增加;在內(nèi)蒙古西北部各等級降水量和降水強度均增加,大雨等級的降水量、降水日數(shù)和降水強度的增加趨勢尤為顯著。

Abstract:

Based on the daily surface precipitation data of 103 meteorological observation stations in Inner Mongolia from 1981 to 2018, the linear trend analysis method was used to analyze spatial and temporal climate characteristics of precipitation, precipitation days and precipitation intensities in Inner Mongolia. Results show that:the precipitation and number of precipitation days of all grades show weak decreasing trends, and the interannual variations of precipitation intensity of each grade was not significant. However, the interannual fluctuations of precipitation of each grade in the humid region is obvious, and the interannual fluctuations of moderate-rain intensity in arid region are significantly greater than that in other climatic areas. The average contribution of each grade of precipitation was light rain > moderate rain > heavy rain, but the regional distribution is uneven. The contribution of light rain days in each climatic area is about 80%-90%, and the proportion of light rain is gradually increased from the humid area in Northeast Inner Mongolia to the arid area in Northwest Inner Mongolia. The spatial distributions of all precipitation grades show a spatial distribution characteristic of decreasing from east to west in Inner Mongolia. The high-value areas of precipitation and precipitation days are mainly distributed in the northeast region, and the high-value areasof precipitation intensity are mainly distributed in the southeast region.Since 2010, the light rain amount and number of light rain days in the northeastern and central west of Inner Mongolia have decreased, while the light rain intensity showed an opposite pattern.In the northwest of Inner Mongolia, the precipitation and intensity of all grades have increased, and the increaseing in precipitation, precipitation days and precipitation intensity of heavy rain were particularly significant.

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申露婷,張方敏,黃進,李云鵬,凌洋.1981—2018年內(nèi)蒙古不同等級降水時空變化特征.氣象科學(xué),2022,42(2):162-170 SHEN Luting, ZHANG Fangmin, HUANG Jin, LI Yunpeng, LING Yang. Spatiotemporal variations of different precipitation grades in Inner Mongolia from 1981 to 2018. Journal of the Meteorological Sciences,2022,42(2):162-170

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收稿日期:2020-07-08
最后修改日期:2020-10-13
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在線發(fā)布日期: 2022-05-31
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