NEWS

These are the news starting 01 Jan 2022
Click here for the news of the previous years.

01
Aug
22
Upload jul22.dat to data archive.
02
Jul
22
Upload jun22.dat to data archive.
20
Jun
22
We had our second lightning storm for 2022 this night; it was much heavier than the first from 25th April. The Boltek LD-350 worked fine:

Here what EUCLID shows 2 hours before: note the arc going form France over Luxembourg into Germany...

... and here BLITZORTUNG close to midnight UTC ( = 02:00 local time, 20th June):

Click HERE for full video of Nexstorm archive covering the period 19June 22:19 to 20June 09:20 (all UTC times, for local time add +2h)

02
Jun
22
Upload may22.dat to data archive.
07
May
22
WBGT sensor restarted today at 09:00 UTC. Watch how the web bulb temperature changes as the humidified PT100 sensor inside the wick starts to loose heat by evaporation.
01
May
22
Upload apr22.dat to data archive.
New CMP11 pyranometer at CH.6. The calibration (by comparing to the CM11) is still preliminary; it will be updated if more data are available.
29
Apr
22
I wrote the 18th April that our  SMP10 pyranometer will not be repaired; I also refuse to buy a new model, when clearly Kipp & Zonen tells that the dessicant inside the SMP10 is good for 10 years, and ours did not avoid water vapour condensation after 6 years! So I auctioned at eBAY a second hand CMP11 model, which has the old tried and working dessicant capsule, to be replaced every 3 or 4 months. The CMP11 is installed in the same ventilation unit as was the SMP10, and I use a Vernier Instrument amplifier to push the mV voltages up into a 0..2000mV range (which is the range of our Delta_T logger). It was quite a work to route the new cable through a duct that is practically fully occupied. The logger engineering factor was slightly changed from its theoretical value to yield practically the same reading as the CM21; as the day was very hazy, this possibly will have to be redone under full sun conditions. The plot of solar irradiance still shows the CM21 readings; the new CMP11 data are in column #6 titled ESR Solarkip of the today.dat or 7days.dat files.
25
Apr
22
We had the first thunderstorm for this year (it was a real tiny one), and this was also the first registered by the new Boltek equipment.

Click on the picture to emlarge:

18
Apr
22
1. Even if our WBGT heat stress sensor is not yet operational (i.e. the wet bulb is not wetted by distilled water) the 3 temperature sensors are working (just click on the icon with the text "not measured"). A couple of days the GLOBE_T sensor went bad (as it did last year). This time, the culprit was not a bad contact on one of the outside connectors, but a bad contact on the screw terminal of the datalogger. This has been "repaired" today at 07:30 UTC
2. The all.dat file ("all data from last logger restart") became very big, covering more than 3 years of raw data. It has been edited to start now at the 01JAN2021. When usung these raw data files, remeber that our logger does not handle leap years. In a leap year the 29th February is simply a copy of the 28 February.
3. The SMP10 pyranometer from Kipp&Zonen should not need any dessicant for 10 years. Many months ago some droplets appeared at the outer and also the inner dome. I removed the outer dome, cleaned it, but the problem showed up again. Kipp&Zonen refuses to acknowledge the problem, puts all the blame on me and says a repair will be more expensive than a new device. I will not buy another of these expensive pyranometers (about 2000 Euro); we will use the old and very robust CM21, and either reuse the bad SMP10 just for comparison, or buy a second hand pyranometer as a replacement. I am quite upset on this; I should have contacted Kipp&Zonen before the end of the 5 year warranty (we bought the SMP10 in 2015) and returned it at the slightest suspect condensation...
06
Apr
22
There was an interruption in the plots for the last 6 days. I am not sure about the cause. No data are lost (thx to our datalogger!). Everything seems coming together again today in the afternoon...
I will keep an eye on this (I am abroad for the moment).
01
Apr
22
Upload mar22.dat to data archive.
22
Mar
22
Our SPM10 pyranometer (ch.6. label Solarkip) show a condensation problem since many months; water droplets form on both quartz domes. It has been send back for repair. The graphs now show the readings of our second CM21 pyranometer (ch.23, label Solarrad). The readings given in the trends section for 2021 may by slightly too low; for sunhine duration the CM21 readings give a higher total of 1682 hours. I added the CM21 readings to the "monthly" sheet of the 2022_only.xls file in the data archive.
13
Mar
22
New calculation of the RAF (Radiation Amplification Factor) from the last 8 sunny days in March:

Click to go to the Blog!

11
Mar
22
My friend Claude Boes and myself replaced today the old cup anemometer by a new one. Claude did most of the perilous work, as he is a good climber on ropes. Click here for a very short video.

07
Mar
22
1. Work on all solar sensors (UVA,UVB and 2 pyranometers. Changed dessicant, cleaned etc... Disregard downward peak in data during the morning, caused by removing the sensors for the work to be done.
2. Changed filter of CAIRSENS ozone sensor.
 
01
Mar
22
Upload feb22.dat to data archive.
19
Feb
22
The storm Eunice which passed over Luxembourg during the last hours gives again a nice illustration how wind speed affects CO2 levels: when wind speed is high, the lower air layers become well mixed so that ground CO2 levels (which vary in an important way during the day) become well mixed and minimal:

You may read this paper I wrote with the late Ernst-Georg Beck and which was published by Springer in 2009.

02
Feb
22
1. Upload jan22.dat to data archive.
2. Trends section nearly finished. TOC remains to be done, waiting for Uccle data.
18
Jan
22
I started today the update of the TRENDS page; this is a very time-demanding job, so be patient. Updates will be made step by step.
14
Jan
22
Uploaded 2021_only.xls and meteoLCDstats_1998_2021.xls files with 2021 data and summary statistics into the data archive.
02
Jan
22
Uploaded dec21.dat and 2021.zip (= concatenated file with all months, .dat (=.csv) format) into the data archive.
01
Jan
22
1. Our old faithful Delta_T datalogger does not store the year count in its data-time column, so there usually is a mess with the Gnuplot 7-days plots during the first week (but not with the "today" plots).

2. Look here for an overplot of our 2021 Total Ozone Column measurements with those made at UCCLE by the RMI. As usual ours  not too bad, no reason to be ashamed of :-))!


 

 

 

 


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