基于CLM4.5模擬中國區(qū)域土壤濕度及其時空變化規(guī)律的研究
發(fā)布時間：2019-07-06 14:57
【摘要】：土壤濕度作為全球水循環(huán)的重要組成部分,在天氣、氣候、生態(tài)系統(tǒng)等領(lǐng)域起著舉足輕重的作用,但是由于其很高的時間和空間變異性,大范圍地觀測土壤濕度數(shù)據(jù)是極度不易的。這使得中國區(qū)域長時間尺度土壤濕度的變化規(guī)律的研究變得具有更加特殊的研究意義。在本文中,通過研究CLM4.5對中國土壤濕度的數(shù)值模擬,同時將中國農(nóng)業(yè)氣象土壤水分?jǐn)?shù)據(jù)集當(dāng)做驗證數(shù)據(jù),對二者在時間和空間上的差異進(jìn)行比較分析。同時,分析中國區(qū)域土壤濕度在1951-2010年間的時空變化規(guī)律,并探究土壤濕度與SPEI的相關(guān)關(guān)系。本文得到的主要結(jié)論如下：1.據(jù)中國區(qū)域0-10cm土壤水分的CLM4.5模擬結(jié)果顯示,站點(diǎn)尺度實測值與模擬值的全年、春季、夏季、秋季、冬季的R方分別為0.755、0.783、0.763、0.712和0.716,且其分布特征都表現(xiàn)為了“兩濕一千”的特點(diǎn),也就是說,東北地區(qū)為土壤濕潤半濕潤區(qū),南方和江淮流域是主要的土壤濕中心,而華北則較為干旱,尤其西北地區(qū)如內(nèi)蒙古西部和新疆塔里木盆地沙漠地區(qū)是土壤濕度的干中心,總體上呈從西北向東南逐漸增加的趨勢。此外,模擬平均值在全國范圍均有不同程度的偏濕現(xiàn)象。2.分析了1951-2010年中國區(qū)域土壤濕度的時空變化特征及其變化周期規(guī)律,并從區(qū)域尺度上定量地檢測土壤濕度的具體突變時間。從空間域的角度分析,長江中下游地區(qū)為土壤濕度異常現(xiàn)象的氣候敏感區(qū)。華北地區(qū)、以及西北和東北大部分地區(qū),且華北地區(qū)存在土壤濕度顯著減小現(xiàn)象。從時域的角度來看,土壤水分的年際變化的第一主周期為18年左右,并以10年為第二個主要周期,上述兩周期的波動變化特征控制著在整個時間域的土壤水分變化。從區(qū)域角度看,東北地區(qū)在80年代初土壤濕度變大,90年代中期土壤濕度急劇減小。華北地區(qū)自90年代后土壤濕度驟降。華東、華中地區(qū)土壤干濕變化快,土壤濕度變化年際周期短,振蕩現(xiàn)象明顯。華南地區(qū)土壤在1955年變濕,又在1960和2002年變干和變濕。青藏高原地區(qū)土壤濕度狀態(tài)相對穩(wěn)定,突變現(xiàn)象不明顯。西南地區(qū)土壤濕度在1954年變干,而后在2000年后也有顯著變干的趨勢。西北地區(qū)土壤濕度小,在2008年以后土壤濕度有變大的趨勢。3.氣象干旱對土壤水分缺失,進(jìn)而對農(nóng)業(yè)干旱產(chǎn)生極重要影響。因此,分析氣象干旱與土壤熵情的相互影響、考慮降水和蒸散等氣象因子與土壤水分的相互關(guān)系是非常必要的。本文利用中國區(qū)域60年間(1951-2010年)的土壤濕度CLM4.5模擬值和SPEI產(chǎn)品資料,基于SVD法探究了它們在中國區(qū)域60年間的時空變化和相互耦合關(guān)系。土壤濕度與SPEI四個季節(jié)SVD分析第一模態(tài)的模態(tài)相關(guān)系數(shù)分別為0.85、0.86、0.90、0.77,表明二者的時空相關(guān)性特征顯著,在各個季節(jié)都是高度正相關(guān)�？梢�,中國區(qū)域土壤墑情均與當(dāng)季的大氣水分盈缺相關(guān)密切,當(dāng)季的氣象干旱條件也與土壤濕度情況密不可分。
文內(nèi)圖片：
圖片說明：圖２．１中國分區(qū)示意圖逡逑
[Abstract]:As an important part of the global water cycle, soil moisture plays an important role in weather, climate, ecosystem and other fields, but because of its high temporal and spatial variability, it is extremely difficult to observe soil moisture data on a large scale. This makes the study of the variation of soil moisture on a long time scale in China has more special research significance. In this paper, the numerical simulation of soil moisture in China by CLM4.5 is studied, and the agrometeorological soil moisture data set in China is used as the verification data, and the differences in time and space between the two are compared and analyzed. At the same time, the temporal and spatial variation of regional soil moisture in China from 1951 to 2010 was analyzed, and the relationship between soil moisture and SPEI was explored. The main conclusions of this paper are as follows: 1. According to the CLM4.5 simulation results of 0-10cm soil moisture in China, the R side of site scale measured values and simulated values in spring, summer, autumn and winter are 0.755, 0.783, 0.763, 0.712 and 0.716, respectively, and their distribution characteristics are the characteristics of "two wetness and one thousand". That is to say, Northeast China is a humid and semi-humid area of soil, and the south and Jianghuai River Basin are the main soil moisture centers. North China is relatively dry, especially in northwest China, such as western Inner Mongolia and the desert area of Tarim Basin in Xinjiang, which is the dry center of soil moisture, which tends to increase gradually from northwest to southeast. In addition, the simulated average value has different degrees of partial humidity in the whole country. 2. The temporal and spatial variation characteristics and variation cycle of regional soil moisture in China from 1951 to 2010 were analyzed, and the specific mutation time of soil moisture was quantitatively detected on the regional scale. From the point of view of spatial domain, the middle and lower reaches of the Yangtze River are climate sensitive areas with abnormal soil moisture. There is a significant decrease in soil moisture in North China, as well as in most areas of Northwest and Northeast China. From the point of view of time domain, the first main period of interannual variation of soil moisture is about 18 years, and 10 years is the second main cycle. The fluctuation characteristics of the above two cycles control the change of soil moisture in the whole time domain. From the regional point of view, the soil moisture in Northeast China increased in the early 1980s and decreased sharply in the mid-1990s. The soil moisture in North China has plummeted since 1990 s. In East China and Central China, the soil dry and wet change is fast, the interannual period of soil moisture change is short, and the oscillatory phenomenon is obvious. The soil in South China became wet in 1955, dry and wet in 1960 and 2002. The state of soil moisture in Qinghai-Xizang Plateau is relatively stable, and the sudden change is not obvious. The soil moisture in southwest China became dry in 1954 and then dry significantly after 2000. The soil moisture in northwest China is small, and the soil moisture tends to increase after 2008. 3. Meteorological drought has a very important impact on soil moisture deficiency and agricultural drought. Therefore, it is necessary to analyze the interaction between meteorological drought and soil entropy, and to consider the relationship between meteorological factors such as precipitation and evaporation and soil moisture. Based on the CLM4.5 simulation values of soil moisture and SPEI product data in China during the past 60 years (1951-2010), the temporal and spatial variation and coupling relationship of soil moisture in China during the past 60 years were investigated based on SVD method. The modal correlation coefficients between soil moisture and the first mode of SVD analysis in four seasons of SPEI were 0.85, 0.86, 0.90 and 0.77, respectively, indicating that the temporal and spatial correlation characteristics of soil moisture and soil moisture were significant, and there was a high positive correlation in each season. It can be seen that the regional soil moisture in China is closely related to the atmospheric water surplus and deficit in the current season, and the meteorological and drought conditions in that season are also closely related to the soil moisture.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S152.7
本文編號：2511102
文內(nèi)圖片：
圖片說明：圖２．１中國分區(qū)示意圖逡逑
[Abstract]:As an important part of the global water cycle, soil moisture plays an important role in weather, climate, ecosystem and other fields, but because of its high temporal and spatial variability, it is extremely difficult to observe soil moisture data on a large scale. This makes the study of the variation of soil moisture on a long time scale in China has more special research significance. In this paper, the numerical simulation of soil moisture in China by CLM4.5 is studied, and the agrometeorological soil moisture data set in China is used as the verification data, and the differences in time and space between the two are compared and analyzed. At the same time, the temporal and spatial variation of regional soil moisture in China from 1951 to 2010 was analyzed, and the relationship between soil moisture and SPEI was explored. The main conclusions of this paper are as follows: 1. According to the CLM4.5 simulation results of 0-10cm soil moisture in China, the R side of site scale measured values and simulated values in spring, summer, autumn and winter are 0.755, 0.783, 0.763, 0.712 and 0.716, respectively, and their distribution characteristics are the characteristics of "two wetness and one thousand". That is to say, Northeast China is a humid and semi-humid area of soil, and the south and Jianghuai River Basin are the main soil moisture centers. North China is relatively dry, especially in northwest China, such as western Inner Mongolia and the desert area of Tarim Basin in Xinjiang, which is the dry center of soil moisture, which tends to increase gradually from northwest to southeast. In addition, the simulated average value has different degrees of partial humidity in the whole country. 2. The temporal and spatial variation characteristics and variation cycle of regional soil moisture in China from 1951 to 2010 were analyzed, and the specific mutation time of soil moisture was quantitatively detected on the regional scale. From the point of view of spatial domain, the middle and lower reaches of the Yangtze River are climate sensitive areas with abnormal soil moisture. There is a significant decrease in soil moisture in North China, as well as in most areas of Northwest and Northeast China. From the point of view of time domain, the first main period of interannual variation of soil moisture is about 18 years, and 10 years is the second main cycle. The fluctuation characteristics of the above two cycles control the change of soil moisture in the whole time domain. From the regional point of view, the soil moisture in Northeast China increased in the early 1980s and decreased sharply in the mid-1990s. The soil moisture in North China has plummeted since 1990 s. In East China and Central China, the soil dry and wet change is fast, the interannual period of soil moisture change is short, and the oscillatory phenomenon is obvious. The soil in South China became wet in 1955, dry and wet in 1960 and 2002. The state of soil moisture in Qinghai-Xizang Plateau is relatively stable, and the sudden change is not obvious. The soil moisture in southwest China became dry in 1954 and then dry significantly after 2000. The soil moisture in northwest China is small, and the soil moisture tends to increase after 2008. 3. Meteorological drought has a very important impact on soil moisture deficiency and agricultural drought. Therefore, it is necessary to analyze the interaction between meteorological drought and soil entropy, and to consider the relationship between meteorological factors such as precipitation and evaporation and soil moisture. Based on the CLM4.5 simulation values of soil moisture and SPEI product data in China during the past 60 years (1951-2010), the temporal and spatial variation and coupling relationship of soil moisture in China during the past 60 years were investigated based on SVD method. The modal correlation coefficients between soil moisture and the first mode of SVD analysis in four seasons of SPEI were 0.85, 0.86, 0.90 and 0.77, respectively, indicating that the temporal and spatial correlation characteristics of soil moisture and soil moisture were significant, and there was a high positive correlation in each season. It can be seen that the regional soil moisture in China is closely related to the atmospheric water surplus and deficit in the current season, and the meteorological and drought conditions in that season are also closely related to the soil moisture.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S152.7
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