From Alasdair.Skelton at geo.su.se Wed Jul 4 10:17:22 2018 From: Alasdair.Skelton at geo.su.se (Alasdair Skelton) Date: Wed, 4 Jul 2018 08:17:22 +0000 Subject: [Bolincentret-at-su.se] LUCCI conference in Lund Message-ID: <240f8a9fb20a4a9f9724de91c7b9a932@ebox-prod-srv08.win.su.se> Dear Members of the Bolin Centre, I warmly recommend this conference which will be held in Lund on October 2-4. There are limited spaces, so please register at www.lucci.lu.se if you want to attend. Best wishes, Alasdair Alasdair Skelton Professor of Geochemistry and Petrology Director of the Bolin Centre for Climate Research Department of Geological Sciences Stockholm University 106 91 Stockholm Sweden +46 76 77 076 99 alasdair.skelton at geo.su.se -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: Conference poster LUCCI 2018 update.pdf Type: application/pdf Size: 1886562 bytes Desc: Conference poster LUCCI 2018 update.pdf URL: From rienk.smittenberg at geo.su.se Mon Jul 30 09:19:11 2018 From: rienk.smittenberg at geo.su.se (Rienk Smittenberg - SU) Date: Mon, 30 Jul 2018 09:19:11 +0200 Subject: [Bolincentret-at-su.se] water isotope sampling for this unusual dry summer Message-ID: <38497146-D4EF-45D1-A8A9-9CC29581E6A0@geo.su.se> Dear Bolin colleagues, We are experiencing a highly unusual dry and hot summer in Northern Europe, and I am curious what effect this has had on the water isotopic composition of lakes in Sweden and abroad. The water isotopic composition (the ratios between 18O and 16O, and the ratio between hydrogen en deuterium) of precipitation depends mainly on temperature - out of cold air much water has already condensed in to rain previously, leading the the depletion of the heavy isotope (thus cold=less 18O). We commonly express the isototopic composition against an international standard called ‘delta’. In winter, we thus have lower delta 18O values in our rain than in summer. On the other hand, evaporation leads to the relative enrichment of the heavy isotope, water with 18O will not evaporate as easy as ‘normal’ water. What we are now facing is that we have had virtually no rain since the winter - much of our surface water is still from last autumn and from the winter snow. However we have seen evaporation. The useful thing with these isotopes is that these can be recorded in carbonates or organic matter - which get preserved over the geologic record, and thus provide a tool to reconstruct past hydroclimate. What I now wonder is to what extent the signal of this year will show a significant difference with ‘normal’ years. Obviously factors like groundwater flow, size and depth of lakes etc play a role. In any case I think at the moment there is an exceptional opportunity to take a sample set after these months of dryness. I therefore like to ask you to do one very simple thing, if you are on holidays somewhere in Europe where it has been really dry over the last months: collect a small amount of water (a few ml is enough!) from the place where you are now, and put it in a sealed container (it is important that the water cannot evaporate away). Note date and location, ideally with coordinates. If you can provide a weather report (especially relating to rainfall over the last months) that would be useful. You are welcome to take another sample after 1,2,3 weeks in case you still stay that long. Optional: you are also welcome to take a representative sample of the most abundant tree leaves (e.g. birch, also if these are already on the ground) - place these in a sandwich bag or similar. From these I can extract leaf waxes that contain a water isotopic signature. Once you are back in Stockholm then please send me the water container (clearly labeled!), info about location etc, and your contact (name, email). My aim is to get samples from around Sweden and ideally also Denmark, Germany, Netherlands, UK (Eastern Europe?) where it has been unusually dry and hot. Many thanks! Rienk ------------------------------------------------ Dr. Rienk Smittenberg Senior Lecturer in isotope organic geochemistry Department of Geological Sciences Stockholm University SE-106 91 Stockholm Sweden Phone: +46 (0)8 164 760 Email rienk.smittenberg at geo.su.se https://www.su.se/english/profiles/rsmit-1.188830 **************************************** -------------- next part -------------- An HTML attachment was scrubbed... URL: