Trends in the Airglow Temperatures in the MLT Region-Part 1: Model Simulations
Trends in the Airglow Temperatures in the MLT Region-Part 1: Model Simulations
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DOI：
10.3390/atmos11050468
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发表时间：
2020-05-01
期刊：
影响因子：
2.9
通讯作者：
Vanyo, Michael
中科院分区：
文献类型：
--
作者：
Huang, Tai-Yin;Vanyo, Michael
模拟了大气中CO2浓度增加、太阳活动周期变化（F10.7）和地磁活动（Ap指数）引起的中层和低热层气辉温度变化，定量分析了它们对气辉温度的影响。利用MACD-00和OHCD-00两个气辉模式模拟了由这些影响引起的O（S-1）绿线、O-2（0，1）大气带和OH（8，3）气辉温度的变化，并推断了变化趋势。结果表明，三种气辉温度随CO（2）气体浓度的增加呈现近似-0.5K/decade的线性变化趋势。气辉温度与Ap指数高度相关，与F10.7中度相关，与OH温度呈反相关。发现在OH温度下，F10.7和Ap指数趋势类似于-0.7 +/-0.28 K/100 SFU和类似于-0.1 +/-0.02 K/nT，4.1 +/- 0.7 K/100 SFU，在O-2温度下与0.6 +/- 0.03 K/nT相似，与2.0 +/- 0.6 K/100 SFU相似，与0.4 +/- 0.03 K/在O 1 S温度下的nT。这些结果表明，地磁活动可以对温度产生相当显著的影响，这是以前没有考虑过的。
Airglow intensity-weighted temperature variations induced by the CO(2)increase, solar cycle variation (F10.7 as a proxy) and geomagnetic activity (Ap index as a proxy) in the Mesosphere and Lower Thermosphere (MLT) region were simulated to quantitatively assess their influences on airglow temperatures. Two airglow models, MACD-00 and OHCD-00, were used to simulate the O(S-1) greenline, O-2(0,1) atmospheric band, and OH(8,3) airglow temperature variations induced by these influences to deduce the trends. Our results show that all three airglow temperatures display a linear trend of similar to-0.5 K/decade, in response to the increase of CO(2)gas concentration. The airglow temperatures were found to be highly correlated with Ap index, and moderately correlated with F10.7, with the OH temperature showing an anti-correlation. The F10.7 and Ap index trends were found to be similar to-0.7 +/- 0.28 K/100SFU and similar to-0.1 +/- 0.02 K/nT in the OH temperature, 4.1 +/- 0.7 K/100SFU and similar to 0.6 +/- 0.03 K/nT in the O-2 temperature and similar to 2.0 +/- 0.6 K/100SFU and similar to 0.4 +/- 0.03 K/nT in the O1S temperature. These results indicate that geomagnetic activity can have a rather significant effect on the temperatures that had not been looked at previously.