 |
| Titel |
Average properties and small-scale variations of the mesospheric Na and Fe layers as observed simultaneously by two closely colocated lidars at 30° N |
| VerfasserIn |
L. Chen, F. Yi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 6 ; Nr. 29, no. 6 (2011-06-16), S.1037-1048 |
| Datensatznummer |
250017037
|
| Publikation (Nr.) |
 copernicus.org/angeo-29-1037-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| We report the average properties and small-scale variation features of the
mesospheric Na and Fe layers at 30° N from extensive simultaneous and
common-volume Na and Fe lidar measurements at Wuhan, China. The annual mean
Na and Fe density profiles are derived in terms of an averaging method taken
from an early literature. The mean Na and Fe profiles preserve the sharp
gradients present in most individual density profiles near the layer bottom.
Near the bottommost of the layers the mean Na and Fe scale heights are
respectively −0.42 and −0.30 km. The mean layer parameters coincide well
with the previous report. The Na and Fe densities in the lowest several
kilometers of the layers consistently exhibit nearly the same time
variations. A clear-cut distinction between the Na and Fe time variations
always appears in an altitude range near 90 km. A relatively weak positive
correlation between them persistently occurs also in an altitude range near
100 km. The mean increase and decrease rates for both Na and Fe are altitude
dependent and have a single-peak structure. The time constant of the layer
variation is ~0.07–2.0 h for Na and ~0.02–1.7 h for
Fe, suggesting that the variability is dominated by small-scale processes.
However, there is also a slow net increase in each of the annual mean column
abundances (Na and Fe) during night. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|