本文選題：火星　切入點：熱紅外　出處：《遙感學(xué)報》2016年04期

【摘要】：利用3個火星軌道器獲取的熱紅外波段探測數(shù)據(jù),分析了火星表面亮溫在時間維上的年際和季節(jié)性變化規(guī)律,以及空間維上隨地形和緯度的變化特征。研究結(jié)果表明:(1)5個火星年的表面亮溫年際變化幅度均未超出軌道器熱紅外波段探測數(shù)據(jù)的精度范圍。(2)火星南半球表面亮溫的季節(jié)性變化幅度大,遠(yuǎn)日點時期表面亮溫隨季節(jié)的變化基本符合正弦規(guī)律且年際差異小,而近日點則有多處明顯偏離正弦規(guī)律且年際差異較大;北半球表面亮溫的季節(jié)性變化幅度遠(yuǎn)小于南半球,且季節(jié)特征不明顯,受全球性塵暴影響而引起的夜間升溫要大于夏季太陽輻射能增加引起的升溫。(3)在同一時段,盆地、峽谷等低海拔地形的表面亮溫較高,而山峰、高原、臺地等高海拔地形的表面亮溫一般較低;Olympus Mons地區(qū)的表面亮溫與高程之間存在相關(guān)系數(shù)為 0.9072的負(fù)相關(guān)關(guān)系,線性擬合的結(jié)果表明該區(qū)域海拔每上升1 km,表面亮溫下降約1.4 K。(4)表面亮溫隨緯度的變化總體上滿足低緯度高于高緯度的規(guī)律,但受到地形等因素的影響,表面亮溫最大值出現(xiàn)在偏離赤道的35°S位置,而赤道附近緯度的表面亮溫最小值要小于臨近稍高緯度位置的最小值;從赤道到兩極同緯度表面亮溫的差異逐漸減小。
[Abstract]:Based on the data obtained from three Mars orbiters, the interannual and seasonal variations of the surface brightness temperature of Mars in time dimension, as well as the variation characteristics of spatial dimension with topography and latitude, are analyzed.The results show that the interannual variation of surface brightness temperature in 5 Mars years does not exceed the precision range of the Orbiter's thermal infrared band data. 2) the seasonal variation range of surface bright temperature in the southern hemisphere of Mars is large.The variation of surface brightness temperature with seasons basically accords with the sine law and the annual variation is small, while the perihelion point has many obvious deviations from the sine law and the interannual variation is great, the seasonal variation of surface brightness temperature in the Northern Hemisphere is much smaller than that in the Southern Hemisphere.The seasonal characteristics are not obvious, and the night temperature caused by the global dust storm is higher than that caused by the increase of solar radiation energy in summer.) at the same time, the surface bright temperature of low elevation topography such as basins and canyons is higher, while the peak, plateau, etc.There is a negative correlation between the surface brightness temperature and elevation in the area of Olympus Mons with a negative correlation coefficient of 0.9072.The linear fitting results show that for each elevation of 1 km, the surface brightness temperature decreases by about 1.4 K. ~ (4)) the variation of surface brightness temperature with latitude generally satisfies the rule that the low latitude is higher than the high latitude, but is affected by topography and other factors.The maximum value of surface brightness temperature appears at 35 擄S position deviating from the equator, and the minimum value of surface brightness temperature near the equator is smaller than that near the higher latitude, and the difference between the surface brightness temperature from equator to the same latitude decreases gradually.
【作者單位】： 中國科學(xué)院遙感與數(shù)字地球研究所遙感科學(xué)國家重點實驗室;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金(編號:41472303)~~
【分類號】：P185.3

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本文編號：1705469