Accuracy of temperatures from UKMO analyses of 1994/95 in the Arctic winter stratosphere
Accuracy of temperatures from UKMO analyses of 1994/95 in the Arctic winter stratosphere
复制标题
UKMO 分析 1994/95 年北极冬季平流层温度的准确性
DOI：
10.1029/97gl00754
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Roderic L. Jones
中科院分区：
文献类型：
--
作者：
S. Pullen;Roderic L. Jones
化学输运模型依赖于气象分析来提供控制模型化学的温度。当接近被认为是极地平流层云（PSCs）形成和氯活化开始的温度时，平流层温度的精确表示变得尤为重要。本研究通过将1994/95年冬季英国气象局（UKMO）平流层低层温度与臭氧探测仪在同一冬季独立获得的温度进行比较，检验了它们的误差。研究表明，在分析的温度中存在持续的正偏差，这导致在NAT点对较低的平流层温度的平均高估高达1.7 K。随着海拔高度的增加，也存在显著的随机散射。如果对分析温度的偏差和散射进行修正，北半球相当大的区域暴露在低于NAT点和霜点的温度下，因此会发生化学活化。UKMO温度场的这些差异对利用这些分析进行的模拟研究具有重要意义。
Chemical transport models rely on meteorological analyses to provide temperatures which control model chemistry. An accurate representation of stratospheric temperatures becomes particularly important when temperatures at which polar stratospheric clouds (PSCs) are thought to form and chlorine activation begin are approached. This study examines the errors in United Kingdom Meteorological Office (UKMO) lower stratospheric temperatures during the winter 1994/95 by comparing them with temperatures obtained independently by ozonesondes during the same winter. The study shows that there is a consistently positive bias in the analysed temperatures which leads to a mean overestimation of lower stratospheric temperatures of up to 1.7 K at the NAT point. There is also a significant random scatter which increases with altitude. If corrections in analysis temperature are made for both bias and scatter, considerably larger areas of the Northern Hemisphere are exposed to temperatures below the NAT point and frost point and hence chemical activation. These discrepancies in the UKMO temperature fields have important implications for modeling studies carried out using these analyses.