Seasonal and latitudinal variation of noctilucent cloud altitudes

Details Seasonal and latitudinal variation of noctilucent cloud altitudes Seasonal and latitudinal variation of noctilucent cloud altitudes

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3506801l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 6, CiteID L06801

Mathematics

Logic

13

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Processes: Mesospheric Dynamics, Geographic Location: Arctic Region (0718, 4207)

Scientific paper

We present a summary of ~1500 hours of lidar measurements of noctilucent cloud (NLC) altitudes at Kühlungsborn (54°N), ALOMAR (69°N), and Spitsbergen (78°N). Mean centroid altitudes (z c ) are 82.75 km, 83.33 km, and 83.68 km, respectively. Standard deviations σ representing geophysical variability are ~0.7-1.6 km. Errors of mean heights Δz c are much smaller (60-340 m). Several processes which are not yet fully understood influence z c . Therefore, σ is a better measure of uncertainties in z c compared to Δz c . The increase of NLC heights with latitude is very small (43 +/- 65 m/deg) and statistically not significant. At ALOMAR z c varies with season by up to ~1-1.5 km. NLC heights accumulate around climatological temperatures of 145 K at 69°N and 78°N (higher at 54°N). The LIMA model nicely reproduces observations and indicates that non-variation of NLC heights at polar latitudes is caused by temperature uniformity: the 145 K isotherm varies in height by less than 250 m from the pole to 60°N.

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