Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV

Details Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa13b..03s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA13B-03

Physics

0305 Aerosols And Particles (0345, 4801, 4906), 0340 Middle Atmosphere: Composition And Chemistry, 1610 Atmosphere (0315, 0325), 1640 Remote Sensing (1855), 1650 Solar Variability (7537)

Scientific paper

An earlier analysis of the Polar Mesospheric Cloud (PMC) measurements from the Solar Backscatter Ultraviolet (SBUV & SBUV/2) satellite measurements found that there was a weak long-term increase in the frequency of occurrence of PMCs, which was not statistically significant [DeLand et al. 2003]. Since then, a new Version 3 data set has been developed using an improved PMC detection algorithm which produces more consistent results under all measurement conditions. DeLand et al. [2007] have used this new data set to examine the long-term variations in the PMC brightness. We have utilized this Version 3 data set to examine the corresponding long- term variations in the PMC frequency as a function of latitude. The occurrence frequency data are adjusted for local time effects before merging the overlapping data sets from different SBUV/2 instruments for trend calculations. Preliminary results indicate that while there is a positive trend in all latitude bins, the trend was only about 6% per decade in the lowest latitude bin (50° to 64°) in both hemispheres, and was not statistically significant. At higher latitudes (64° to 74°, and 74° to 82°) the trend was much stronger in both hemispheres (approximately 15% to 25% per decade), and statistically significant. There is also a strong anti-correlation with the long-term variation of solar Lyman-alpha flux, with a peak-to-peak solar cycle variation of approximately a factor of 2 for all latitudes. The weak long-term increase at 50° to 64° N is comparable with that found in the ground based Noctilucent Cloud (NLC) observations for Northern Europe recently updated by Kirkwood et al. [accepted by Ann. Geophys., 2007].

Affiliated with

Also associated with

No associations

Rating

Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-Term Variations in PMC Frequency as a Function of Latitude from SBUV will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1411431