Data trends at meteoLCD: 1998 to 2008


Trends computed from yearly averages at meteoLCD, Diekirch, Luxembourg.
Graphs may be freely copied and used, under the condition to cite:
MASSEN, Francis: Data trends at meteoLCD, 1998 to 2008. http://meteo.lcd.lu

Older trends are here!

Ground Ozone [ug/m3]
("bad ozone")

negative trend: -1.4 ug/m3 per year

 

mean : 39.9 ug/m3
stdev:  6.7

 

See [1] [2] [3] and this figure

Total Ozone Column [DU]
("good ozone")

positive trend: + 4.5 DU per year

calibration factor applied if needed!



mean : 323.5 DU
stdev :   18.3  DU

See [4] [8] ([8] shows strong
positive trend starting 1990 for
latitudes 45-75 North, Europe)

CO2 mixing ratio in ppmV

The 1998-2001 data are too unreliable to be retained for the trend analysis.

For 2002-2008:

positive trend: + 2.15 ppmV per year

mean:   406.4 ppmV
stdev:        5.4 ppmV


See this figure

Air temperature [C]

positive trend: + 0.04 C per year

 

mean : 10.34 C
stdev:    0.34


As the sensor has been moved several times, this trend should be taken with caution!
Only slight warming from 2000 to 2008 (0.13C/decade).
Note sharp drop from 2007 to 2008.

[7] GISS: +0.015 C per year

Diurnal Temperature             
Range (DTR)  [C]

not yet updated to 2008!
positive trend: + 0.07 C per year (right axis)


mean:  8.46 C
stdev:  0.59


Note that daily maximum rises faster than daily minimum. DTR increase could be related to increasing insolation (sunshine duration)

See [5]

.
Total Yearly Rainfall [mm]

negative trend: - 24 mm per year

mean : 736.8 mm
stdev : 147.8 mm

Rainfall in Diekirch may be very different from that at the Findel airport !

Note the good fit by a simple sinus function;
rainfall changes may be periodic and a linear trend could be meaningless!
[6] gives medium term periods of 10 to12 years for the  region from England to eastern Germany.

Solar energy on a horizontal plane

negative trend: -3.2 kWh/m2 per year

 

mean: 1117 kWh/m2
stdev:    52  kWh/m2

 

Note strong negative trend starting 2004! Is this a signature of the end of solar cycle 23 and the much delayed solar cycle 24 ?

see [9]

Sunshine duration
(derived from pyranometer data by Olivieri's method)

positive trend: + 25 hours per year

mean:  1673 hours
stdev:   190 hours

Note strong negative trend from 2004 to 2008.

Sunshine duration in 2008 is approx. 100 hours less than in 2004.

Biologically eff. UVB dose on a horizontal plane in kWh/m2

positive trend: + 0.001 eff. kWh/m2 per year

 

mean:  0.130 eff. kWh/m2
stdev:  0.011 eff. kWh/m2

Trend is negative (-0.0003)  from 2004 to 2008.

See [10]

UVA dose on a horizontal plane in kWh/m2

positive trend: + 0.3 k Wh/m2 per year

mean:  54 kWh/m2
stdev:    5 kWh/m2

Trend w/o 1998: -0.2 kW/(m2*y-1)

Note strong negative trend from 2004 to 2008!

NO concentration in ug/m3

The 1998-1999 data are too unreliable to be retained.

For 2000-2008::

negative trend: -0.31 ug/m3 per year
( = 35% reduction relative to 2000)

mean:   9.9 ug/m3
stdev:   1.9 ug/m3

see [11] which gives ~30% reduction from 1990 to 2005 for the EU-15 countries.

NO2 concentration in ug/m3

The 1998-1999 data are too unreliable to be retained.

For 2000-2008:

negative trend: - 0.16 ug/m3 per year

mean: 22.6 ug/m3
stdev:   2.0 ug/m3

 

References:

1 Europe's Environment 4th AR (2007) Fig. 2.2.3 http://reports.eea.europa.eu/state_of_environment_report_2007_1/en/Belgrade_EN_all_chapters_incl_cover.pdf
2 EPA: Ozone trends. http://www.epa.gov/airtrends/ozone.html
3

Jonson et al: Can we explain the trends in European ozone levels? Atmos. Chem. Phys. Discuss., 5, 59575985, 2005. http://www.atmos-chem-phys-discuss.net/5/5957/2005/acpd-5-5957-2005.pdf

4 Ozone trends at Uccle  http://ozone.meteo.be/ozone/trends.php
5 Rebetez, Beniston: Analyses of the elevation dependency of correlations between sunshine duration and diurnal temperature range this century in the Swiss Alps. 1998.
6 R.G. Vines, CSIRO: European rainfall patterns. International Journal of Climatology, vol.5, issue 6, p. 607-616.
7 http://global-warming.accuweather.com (15 Jan 2009).
8 J.W. Krzyscin, J.L.Borkowski: Total ozone trend over Europe: 1950 - 2004. ACPD, 8, 47-69, 2008.
9 NASA: Solar Physics: The Sunspot Cycle.
10 de Backer et al: ftp://ftp.kmi.be/dist/meteo/hugo/posters/20080630tromso_hdb.pdf (temporarly unavailable)
11 EEA: Emission trends of NOx 1990 - 2005

  

 


file: meteolcd_trends.html

francis.massen@education.lu
last revision:17 Jan 09