Group picture of the participants of the Open ARTS Community Workshop 2010 at the Kristineberg Marine Research Station. | 
Auditorium at the Open ARTS Community Workshop 2010 at the Kristineberg Marine Research Station. |
An artist's impression of the CloudIce satellite, as proposed in the CloudIce Mission proposal for ESA Earth Explorer 8. (Image by Astrium SAS.) | 
Our group members April 2010. In front: Oliver Lemke, Thomas Kuhn, Salomon Eliasson, Isaac Moradi. In the back: Ajil Kottayil, Gerrit Holl, Johan Reponen, Stefan Buehler, Jana Mendrok, Mathias Milz. |
June to September climatological mean of (a) OLR (W m−2) and 850 hPa winds (m s−1) and (b) daily OLR standard deviation. (c) The climatological mean of UTH (in %RH) and 500–200 hPa averaged winds (m s−1). The clima- tology is constructed using 11 years of data (1999–2009). (d) The standard deviation of daily UTH values. This is Figure 1 in xavier10:_variability_grl. | 
Distribution of CloudSat IWP between 60N and 60S on a 5° grid, based on data from July 2006 to August 2009. This is Figure 3 in seliassonxx:_assessing_acpd. |
Comparison of integrated water vapor data over Kiruna from a number
of different instruments. Overview of all time series used in the
study. Instruments include a ground based GPS reciever, a ground based
Fourier transform infrared spectrometer, a ground based microwave
radiometer, a satellite based microwave radiometer and radiosondes. The comparison was the topic of the Master thesis by | 
During cold weather, a phenomenon known as diamond dust causes effects such as sun dogs. A faint halo is also visible. |
Mean yearly UTH map from NOAA-17 AMSU-B data with the location of the ARM
stations. This is figure 1 of moradixx:_comparing_arm_jgr,
submitted 28 January 2010. | 
Collocations between different satellite instruments can be used for various
purposes. The figure shows the footprints of the CloudSat Cloud Profiling
Radar, the Microwave Humidity Sounder on-board NOAA-18, and the
High-Resolution Infrared Radiation Sounder on-board the same satellite. This
is Figure 1 of hollxx:_collocating_amtd,
submitted 29 January 2010. |
Polar Stratospheric Clouds over Kiruna, 2010-01-10. | 
Our group members October 2008: Isaac Moradi, Mathias Milz, Stefan Bühler, Salomon Eliasson, Erik Johansson, Oliver Lemke, Gerrit Holl. Kiruna, 2008-10-29. |
Channel positions of the High Resolution Infrared Radiation Sounder (HIRS) on the satellite NOAA 14, relative to the atmospheric radiance spectrum. Gray bands indicate HIRS channel positions. For Channels 8-12 their shape indicates the shape of the channel response function (with arbitrary scaling). For Channels 1-7 only the center positions are shown, because these channels overlap significantly. Smooth black curves show Planck functions for different temperatures. The temperatures are 225 K, 250 K, 275 K, and 299.71 K, where the latter corresponds to the surface temperature. The blue curve shows the atmospheric spectrum for a tropical atmosphere, calculated on a frequency grid with 2.5 cm-1 resolution. This is Figure 1 of buehlerxx:_efficient_jqsrt. It was created by Ajil Kottayil. | 
AIRS - AMSU-B-16 vs AMSU-B-16 (left) and HSB - AMSU-B-16 vs AMSU-B-16 (right) for January 2003. The solid white line is the mean and the dashed white line the standard deviation of the differences for 1% RH bins. Darker shades indicate higher number of measurements. This is Figure 2 of an article in GRL. |
Mashrab Kuvatov after his PhD defense. | 
Halo in the morning at the Space Campus in Kiruna, 2009-03-25. |
If you happen to be in a place below -30°C, get a cup of hot water and throw it up in the air! Follow this link to see more pictures | 
Stellar Plates: These common snowflakes are thin, plate-like crystals with six
broad arms that form a star-like shape. Their faces are often decorated with
amazingly elaborate and symmetrical markings.
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Kiruna, 25 December 2008.
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Polar Stratospheric Clouds over Kiruna, 2008-12-19. |
Median UTH from AMSU-B on NOAA 16. Upper tropospheric humidity (UTH) is an important parameter of the climate system. Our goal is to derive a UTH data set from operational satellite microwave data. More details can be found on the project page, or in the recent JGR paper. | 
Torne river near Vittangi, July 2008.
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Halo at the Space Campus in Kiruna, 2008-03-27. | 
Aurora Borealis over Kiruna, 2007-03-11. |
Merry Christmas! God jul! | 
Polar Stratospheric Clouds over Kiruna, 2007-12-16. |
Kiruna, 2007-11-10. Start of the skiing season! | 
Light phenomenon in Kiruna, Sweden, 2007-11-08. |
2D histogram of AMSU-B Channel 20 minus Channel 18 brightness temperature differences (Tb20-Tb18), versus Channel 18 brightness temperatures (Tb18). Clouds lead to negative Tb20-Tb18, and to very cold Tb18. This can be used to filter out clouds from AMSU-B humidity measurements. The figure is part of Figure 1 of an article in ACP. | 
This image shows a swath of the AMSU-B instrument which plays an important role in our research. You can find AMSU related articles in our publication list. |
Calculated OLR at 100 hPa as a function of surface temperature for the five different radiosonde classes. The solid line is a linear fit to the data from all five classes. The grey shaded area shows the one standard deviation variability of clear-sky CERES/TRMM data. For details see John et al. (2006). | 
Mashrab after his PhD defence. |
