本文選題：熱層 + 夜間密度增強(qiáng)��； 參考：《中國(guó)科學(xué)技術(shù)大學(xué)》2016年博士論文

【摘要】：熱層大氣溫度在無(wú)太陽(yáng)輻射加熱的夜間出現(xiàn)升高的現(xiàn)象稱(chēng)為熱層大氣的夜間溫度增強(qiáng),而且類(lèi)似的夜間增強(qiáng)也在熱層大氣密度中被觀測(cè)到。由于熱層密度夜間增強(qiáng)反映了溫度夜間增強(qiáng),本文統(tǒng)稱(chēng)熱層溫度和密度的夜間增強(qiáng)為熱層大氣夜間增強(qiáng)現(xiàn)象。自上世紀(jì)70年代以來(lái),通過(guò)衛(wèi)星和地基的觀測(cè),熱層溫度(密度)夜間增強(qiáng)現(xiàn)象被發(fā)現(xiàn)并得以研究。以往研究表明,熱層大氣的夜間增強(qiáng)一般發(fā)生在地方時(shí)0點(diǎn)至4點(diǎn)之間的赤道地區(qū),其特征幅度在40K至150K之間。在本論文中,我們進(jìn)一步深入研究了中高緯度地區(qū)的熱層大氣夜間增強(qiáng)現(xiàn)象,包括全球熱層大氣夜間增強(qiáng)現(xiàn)象隨季節(jié)和緯度變化特性等,并探索了低層大氣八小時(shí)遷移潮汐波的上傳特性以及其對(duì)熱層大氣夜間溫度／密度增強(qiáng)的影響。以下為本論文的主要結(jié)果：1.首先,通過(guò)分析美國(guó)磨石山Millstone Hill觀測(cè)站(42.5°N,71.5°W)的非相干散射雷達(dá)以及法布里珀羅氣輝干涉儀觀測(cè)數(shù)據(jù),研究了2011年8月1日至11日以及2012年1月12日至23日期間中緯度夜間的離子和中性氣體溫度變化情況。研究結(jié)果表明：在冬季夜間,離子和中性氣體溫度的夜間變化中存在后半夜增溫現(xiàn)象,其發(fā)生在凌晨3-4點(diǎn),且增溫幅度為30-90 K。而在夏季,只有中性氣體出現(xiàn)后半夜增溫,而離子溫度沒(méi)有明顯的夜間增溫現(xiàn)象。我們的研究表明,中高緯地區(qū)熱層中性氣體后半夜增溫由中低緯地區(qū)夜間增溫現(xiàn)象向較高緯擴(kuò)展導(dǎo)致。2.其次,利用2002年至2009年期間CHAMP衛(wèi)星的熱層大氣密度數(shù)據(jù),研究了不同季節(jié)以及不同太陽(yáng)活動(dòng)條件下的熱層大氣夜間密度隨緯度和地方時(shí)的變化情況。結(jié)果表明,作為夜間溫度增強(qiáng)現(xiàn)象在熱層大氣密度中的反映,夜間密度增強(qiáng)現(xiàn)象在各個(gè)季節(jié)以及不同太陽(yáng)活動(dòng)條件下都有發(fā)生,且其發(fā)生特征包括時(shí)間和強(qiáng)度等顯著地隨季節(jié)以及太陽(yáng)活動(dòng)的改變而改變。在太陽(yáng)活動(dòng)低年的條件下,赤道地區(qū)夜間密度增強(qiáng)現(xiàn)象的峰值時(shí)間在凌晨1點(diǎn)附近,而在太陽(yáng)活動(dòng)高年,赤道地區(qū)夜間密度增強(qiáng)現(xiàn)象峰值時(shí)間要早1至2個(gè)小時(shí)。此外,統(tǒng)計(jì)結(jié)果還表明,夜間密度增強(qiáng)現(xiàn)象表現(xiàn)出由赤道地區(qū)向南半球擴(kuò)展趨勢(shì),且在太陽(yáng)活動(dòng)低年的條件下更加明顯。3.再者,基于美國(guó)國(guó)家大氣研究中心電離層熱層電動(dòng)力學(xué)耦合模式和加拿大中間層大氣擴(kuò)展模式,利用數(shù)值模擬的方法,研究熱層大氣溫度(密度)夜間增強(qiáng)現(xiàn)象的形成機(jī)制。為了分析不同低層大氣潮汐波對(duì)熱層大氣夜間熱層大氣溫度(密度)夜間增強(qiáng)現(xiàn)象的貢獻(xiàn),我們研究在不同潮汐組合作為電離層熱層電動(dòng)力學(xué)耦合模式底邊界條件下的熱層大氣溫度、密度夜間的變化特性。模擬結(jié)果表明,周日、半日以及八小時(shí)潮汐的相互作用是形成熱層大氣夜間增強(qiáng)的主要原因,且低層大氣的八小時(shí)潮汐顯著地影響著熱層大氣夜間增強(qiáng)的緯度分布。此外,我們進(jìn)一步揭示了熱層大氣八小時(shí)潮汐分量的來(lái)源,并得出熱層大氣的八小時(shí)潮汐受多種影響,包括：晝夜太陽(yáng)輻射加熱變化產(chǎn)生的諧波震蕩,低層大氣上傳的八小時(shí)潮汐分量,以及半日潮汐與背景大氣非線(xiàn)性相互作用結(jié)果。4.最后,為了揭示熱層大氣夜間增強(qiáng)的季節(jié)變化,我們通過(guò)數(shù)值模擬的方法,研究了八小時(shí)潮汐向上傳播并影響熱層大氣的季節(jié)變化特性。我們發(fā)現(xiàn)：1)背景緯向風(fēng)以及徑向風(fēng)可以顯著的影響八小時(shí)潮汐的向上傳播過(guò)程；2)低層大氣的八小時(shí)潮汐不僅影響著熱層大氣八小時(shí)潮汐分量的幅度和緯度分布,同時(shí)也影響背景風(fēng)對(duì)八小時(shí)潮汐上傳過(guò)程：3)背景平均溫度和溫度梯度的半球差異同樣影響著八小時(shí)潮汐的上傳過(guò)程。
[Abstract]:Atmospheric temperature in solar radiation heating at elevated temperature at night phenomenon called enhancing the thermosphere, and similar enhancement in night thermosphere density was observed. Due to thermal layer density enhancement reflects the night temperature at night is enhanced, the paper referred to the hot layer temperature and density enhancement for the night the thermospheric night enhancement phenomenon. Since the last century since 70s, through the observation satellite and ground temperature, thermal layer (density) night enhancement phenomenon was found and studied. Previous studies have shown that atmospheric night enhancement generally occurs in the place of 0 points to 4 points between the equatorial regions, the characteristics of the range between 40K to 150K. In this thesis, we further study the heat in the atmosphere in high latitude regions night enhancement phenomena, including the global thermospheric night enhancement with season and latitude variation Etc., and explored the characteristics of tidal wave upload of the lower atmosphere eight migrated and the atmospheric temperature at night / density enhancement effect. The following is the main results of this thesis: 1. first of all, through the analysis of the Moshishan Millstone Hill Observatory (42.5 ~ N, 71.5 ~ W) of the non scattering radar Perot airglow interferometer and data coherence, during the study period from August 1, 2011 to 11 and January 12, 2012 to 23 days in the ion latitude nighttime and neutral gas temperature changes. The results show that: in the winter night after midnight, there warming ions and neutral gas temperature changes in the night, it happened at 3-4 a.m., and the warming rate is 30-90 K. in the summer, only the neutral gas appears after midnight warming, while the ion temperature has no obvious Nighttime Warming. Our study shows that in high latitudes in the thermosphere Gas after midnight warming by middle and low latitudes in nighttime warming phenomenon to a high latitude extension leads to.2. second, using the data from 2002 to 2009 during the CHAMP satellite thermospheric density, were studied in different seasons and different solar activities under the conditions of the thermospheric density changes with night latitude and local time. The results showed that as the night temperature enhancement phenomenon reflected in the density of heat in the atmosphere, the night density enhancement phenomenon has occurred in all seasons and different solar activity conditions, and its features include the time and intensity of significant seasonal and solar activity changes. In the condition of low solar activity under the equator at night the phenomenon of enhanced density peak time in the vicinity of 1 in the morning, and in the high solar activity, the equatorial region density enhancement peak time at night to early 1 to 2 hours. In addition, the The results also show that the night density enhancement phenomenon showed by the equatorial region of the southern hemisphere and the expansion trend, in the condition of low solar activity years is more obvious in the case of.3. in the middle of the National Center for Atmospheric Research of ionospheric electrodynamic coupling mode and Canada thermal layer layer gas expansion model based on the method of numerical simulation is used to study the thermal atmosphere the temperature (density) at night. In order to enhance the formation mechanism of the phenomenon of different atmospheric tidal wave of atmospheric nighttime atmospheric temperature (density) night enhancement contribution, we study in different tidal combination as atmospheric temperature thermal coupling model of bottom layer ionospheric electrodynamics boundary conditions, the density characteristics at night the simulation results show that, on Sunday, eight hours and the interaction of semidiurnal tides is mainly due to the formation of thermospheric nighttime enhancement, and low layer The eight hour tidal gas significantly affects the latitude distribution of atmospheric nighttime enhancement. In addition, we further reveal the source of atmospheric tidal component for eight hours, and the atmospheric eight hour tide is affected by many factors, including: the harmonic oscillation generates circadian variation of solar radiation heating, the lower atmosphere upload the eight hour tidal component, as well as the semidiurnal tide and background atmospheric nonlinear interaction results in.4. at last, in order to reveal the seasonal variation of atmospheric nighttime enhancement, we adopted the method of numerical simulation, studied eight hours to spread and influence on tidal seasonal variation characteristics of thermospheric. We found that: 1) the background zonal wind and radial the wind can significantly affect the eight hour tidal upward propagation process; 2) the lower atmosphere eight hours tide not only affects the atmospheric eight hour tidal component amplitude and latitude The degree distribution also affects the background wind to the eight hour tidal transmission process: 3) the hemispherical difference between the background mean temperature and the temperature gradient also affects the eight hour tidal transmission process.

【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P351

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本文編號(hào)：1745882