On seasonality of stratomesospheric CO above midlatitudes: New insight from solar FTIR spectrometry at Zugspitze and Garmisch
On seasonality of stratomesospheric CO above midlatitudes: New insight from solar FTIR spectrometry at Zugspitze and Garmisch
复制标题
关于中纬度地区以上平流层二氧化碳的季节性：楚格峰和加米施太阳 FTIR 光谱测量的新见解
DOI：
10.1029/2009gl040056
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发表时间：
2009
影响因子：
5.2
通讯作者：
R. Sussmann
中科院分区：
文献类型：
--
作者：
T. Borsdorff;R. Sussmann
通过一种新的正则化方案，从FTIR得到了中纬度以上平流层(24-100公里)CO的显著季节性。Zugspitze(北纬47.42°，东经10.98°，海拔2964英里)每半小时平均和附近的加米施(745 ma.s.l)测量结果吻合良好(R=0.94，斜率0.91，标准偏差12%)。Zugspitze系列(1999年-2008年)的平均季节变化表现为11-4月的增强(2月最大值为3.6 3×10 16 cm−2)和夏季背景(1.6 4×10 16 cm−2)，这与WACCM模式一致。经测量的月平均值显示，冬季的年变率高达32%(1-西格玛)，这是世界气候变化中心没有再现的(R=−0.13)。由于涡旋空气输送的加强(持续1-3天)，日平均的频率分布在冬季是右偏的，这通常反映了涡旋边界的CO水平，甚至可能达到涡旋中心水平(≈是多年月中位数的300%)。
A significant seasonality in stratomesospheric CO (24–100 km) above mid‐latitudes is derived from FTIR via a new regularization scheme. Half hourly means from the Zugspitze (47.42°N, 10.98°E, 2964 m a.s.l.) and nearby Garmisch (745 m a.s.l.) measurements show excellent agreement (R = 0.94, slope 0.91, standard deviation 12%). Mean seasonality of the Zugspitze series (1999–2008) shows a November–April enhancement (February maximum 3.63 × 1016 cm−2) and a summer background (1.64 × 1016 cm−2) which agrees with the WACCM model. Measured monthly means reveal a year‐to‐year variability of up to 32% (1‐sigma) in winter not reproduced by WACCM (R = −0.13). Frequency distributions of daily means are right skewed in winter due to enhancements by vortex air transport (1–3 days duration) which typically reflect CO levels of the vortex border and may even reach vortex‐center levels (≈300% of the multi‐annual monthly median).