Long-term trend and solar cycle in the middle atmosphere temperature revealed from merged HALOE and SABER datasets
Long-term trend and solar cycle in the middle atmosphere temperature revealed from merged HALOE and SABER datasets
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DOI：
10.1016/j.jastp.2020.105506
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发表时间：
2021
影响因子：
1.9
通讯作者：
Tao Li;J. Yue;J. Russell;Xi Zhang
中科院分区：
文献类型：
--
作者：
Tao Li;J. Yue;J. Russell;Xi Zhang
利用长期地面和卫星数据集和/或模式模拟研究了中层大气温度趋势和太阳活动周期。单颗卫星对中层大气温度的观测时间不够长（小于2个太阳周期），无法很有把握地得出长期趋势和太阳周期效应。利用1991 - 2005年的卤素掩星实验（HALOE）和2002 - 2019年的宽带发射辐射测量大气探测（SABER）资料，研究了45°S-45°N中层大气温度的长期变化趋势和太阳活动周期。在南半球热带和副热带地区，75 km以下的冷却趋势明显，在60-70 km附近的最大值约为-1.2 K/10年。南半球的冷却趋势比北方的冷却趋势大。仅从SABER数据集得出的趋势比从合并数据集得出的趋势小约1.5倍，这与1995年后平流层上部臭氧的恢复是一致的。在平流层上部和中间层下部，温度对11年太阳活动周期的正响应约为1 K/100太阳通量单位（sfu），而在中纬度中间层上部，温度的正响应可增加到2 K/100 sfu以上。温度响应表现出明显的半球不对称性，在70公里以下的响应较强，但较弱以上的南半球比那些在NH。这可能与太阳间接辐射引起的波浪活动的半球不对称性有关。
The middle atmosphere temperature trend and solar cycle have been studied with long-term ground-based and satellite datasets and/or model simulations. Single satellite observations for middle atmosphere temperature are not long enough (less than 2 solar cycles) to derive long-term trend and solar cycle effects with great confidence. Using a nearly 30-year dataset merged from the Halogen Occultation Experiment (HALOE) observations between 1991 and 2005 and the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) observations between 2002 and 2019, we study the long-term trend and solar cycle in the middle atmosphere temperature between 45°S and 45°N. The cooling trend is significant below 75 km with a maximum value of ~ -1.2 K/decade near 60–70 km in the southern hemisphere (SH) tropical and subtropical region. The SH cooling trend is larger than its counterpart in the northern hemisphere (NH). The trend derived from the SABER only dataset is ~1.5 times smaller than that derived from the merged dataset, which is consistent with the upper stratospheric ozone recovery after 1995. The positive temperature response to the 11-year solar cycle is ~1 K/100 solar flux units (sfu) in the upper stratosphere and lower mesosphere and increase to more than 2 K/100 sfu in the upper mesosphere of the middle latitudes. The temperature responses show clear hemispheric asymmetry with stronger responses below 70 km but weaker above in the SH than those in the NH. This is likely related to hemispheric asymmetry of wave activities induced by indirect solar radiation.