以前1万年至未来3千年天文辐射时空分布的长期演变

SPACE-TIME EVOLUTION OF THE ASTRONOMICAL RADIATION FROM PAST TEN THOUSAND TO FUTURE THREE THOUSAND YEARS

中文摘要:

      大气上界太阳辐射又称为日射、完全透明大气的太阳辐射、入射太阳辐射、没有大气时的太阳辐射或天文辐射等等。本文均采用“天文辐射”^[1]一词。它较好地揭示了大气上界太阳辐射日变化、年变化与随纬度分布的原因实质(即地球自转角速度、赤纬、日地距离等天文参数的变化及地理纬度的分布)。而且,天文辐射在地质时代的长期演变也主要取决于地球轨道参数(黄赤交角、偏心率及岁差)的周期性变化。这主要是由于太阳系中的其他8个行星以及月亮等施加的引力所造成的。根据以上的分析可以认为,采用天文辐射一词是较为确切的。它从天体力学角度揭示了大气上界太阳辐射时(日变化、年变化、长年变化)空(地理纬度)变化的原因实质,相对于其他学术词汇而言,含有实质性的信息量。

英文摘要:

      Calculation of the long-term evolution of the astronomical (i.e.,extra-terrestrial)radiation caused by the changes in earth-orbit parameters, obliquity of ecliptic, eccentricity and longitude of perihelion, is performed. Results show striking contrasts in seasonal radiation anomalies and geographical latitudes between the past thousand year and future three thousand year periods. It is worth noting that in the past its positive anomaly center roughly occurred over the north polar region in July and in the future it will move to 20°N in April and May, but with much weaker intensity than in the past.