A comparison of hydroxyl rotational temperatures from Davis (69 degrees S, 78 degrees E) with sodium lidar temperatures from Syowa (69 degrees S, 39 degrees E) - art. no. 1025

摘要

1] We report the first substantive inter-site comparison of high southern latitude mesopause region winter temperatures. Davis (69degreesS, 78degreesE) hydroxyl rotational nightly-mean temperatures are significantly correlated with Syowa (69degreesS, 39degreesE) sodium lidar nightly-mean temperatures at 87 km made in 2000 (correlation coefficient of 0.68) and 2001 (0.51) despite a site separation of similar to1500 km. The Davis winter average temperature in 2001, 203 K, differs from the Syowa value of 201 K only by the uncertainty in the measurement. A more substantial 7 K separates the year 2000 winter averages, Davis again being warmer. The temperature difference between the sites is attributed to either variations in the hydroxyl layer or short-term cooling events in the mesopause region above Syowa that are not detected above Davis. Syowa winter temperatures at 87 km are similar to7 K cooler than for an equivalent latitude northern hemisphere site. [References: 10