TY - JOUR AU - Palcsu, László AU - Túri, Marianna AU - Futó, István AU - Kovács, János AU - Szabó, Péter AU - Orsovszki, Judit AU - Temovski, Marjan AU - Rinyu, László TI - Local temperature calibration of carbonate-water oxygen isotope fractionation and clumped isotopes (?47) in a karstic freshwater limestone environment JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SP - 8493 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/33071926 ID - 33071926 N1 - 280334 AB - Oxygen isotope ratios of carbonates are widely used as palaeoclimate indicators since isotope fractionation between the carbonate and the water phase is temperature dependent. The available empirical equationsare reliable for deposits which are precipitated under isotopic equilibrium. However, in many cases, precipitation of abiotic carbonate sediments (flowstones, freshwater limestones, travertines, tufas, etc.) can occur with fast CO2 degassing, which tends to result in a kinetic fractionation of isotope compositions. In karst environments, freshwater limestone is precipitated from cold spring waters as the creek is flowing and the dissolved CO2 is released from the water. This process creates tufa deposits. Our aim is to investigate the suitability of the tufa deposits as a palaeoclimate archive, even if kinetic fractionation plays a significant role during carbonate formation. In Mecsek Mts, Hungary, tufa deposits can be found in karst valleys. We have chosen a karst spring of constant annual temperature of 10.3 ?C. As the water is flowing away from the spring, it is heated up or cooled down by the ambient air, so the annual temperature variation is increasing with the distance from the spring. In 2015, glass plates, as well as temperature loggers, were placed in the water downstream from the spring along with a 200 m long section, so that carbonate could be precipitated onto the glass surface. In 3-4 weeks the glass plates are replaced. Daily average temperatures of the water vary between 0 and 25.6 ?C, while temperatures averaged to the sampling periods vary between 0.8 and 20.1 ?C. The first ? 18Ocarb and clumped isotope results show a significant temperature dependence, although the equations are shifted from those that are reliable to equilibrium circumstances. However, both ? 18Ocarb-T and ?47-T relationships seem to be significant and therefore applicable to the old tufa layers for reconstructing palaeotemperatures. LA - English DB - MTMT ER - TY - JOUR AU - Ignéczi, Ádám AU - Sole, Andrew AU - Livingstone, Stephen AU - Ng, Felix AU - Clark, Chris TI - Increasing bed-to-surface transfer of topographical variations affects the distribution of surface lakes on the Greenland Ice Sheet after 2100 JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 PG - 1 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/31888908 ID - 31888908 LA - English DB - MTMT ER - TY - JOUR AU - Meister, P AU - Pósfai, Mihály AU - Pekker, Péter AU - Molnár, Zsombor AU - Neuhuber, S AU - Demény, Attila AU - Gieger, S AU - Frisia, S TI - Mineralogy and nano-structure of modern dolomite in Lake Neusiedl, Austria JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 PG - 1 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/31373161 ID - 31373161 LA - English DB - MTMT ER - TY - JOUR AU - Kiss, Gabriella Ilona AU - Túri, Marianna AU - Futó, István AU - Kovács, János AU - Szabó, Péter AU - Palcsu, László TI - Oxygen isotope ratio measurements on bioapatite samples prepared from mammal tissues: method development at ICER Centre JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/31364898 ID - 31364898 N1 - 280335 LA - English DB - MTMT ER - TY - JOUR AU - Szabó-Krausz, Zsuzsanna AU - Kósa, Zsuzsanna AU - Török, Ákos AU - Szabó, Csaba AU - Falus, György TI - Geochemical and physical changes of CEM I and II cement paste samples treated in acetic acid solutions of pure or simulated granitic pore wCEM I and IIater JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 PG - 1 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/31286066 ID - 31286066 LA - English DB - MTMT ER - TY - JOUR AU - Koronczay, Dávid AU - Lichtenberger, János AU - Hospodarsky, G. TI - Inversion of ducted VLF transmitter signals observed in the plasmasphere JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/31177143 ID - 31177143 LA - English DB - MTMT ER - TY - JOUR AU - Farics, Éva AU - Dunkl, I. AU - Józsa, Sándor AU - Haas, János AU - Kovács, János TI - Traces of the Late Eocene – Early Oligocene volcanic activity in the Buda Hills (Transdanubian Range, Hungary): link to the volcanism along the Periadriatic – Mid-Hungarian – Sava-Vardar zone JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/30944635 ID - 30944635 LA - English DB - MTMT ER - TY - JOUR AU - Ludmány, András AU - Baranyi, Tünde AU - Muraközy, Judit TI - Assessing flare productivity from sunspot data JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/30927812 ID - 30927812 AB - The solar flare forecast techniques are usually based on magnetogram data, they mostly consider a solar active region as a whole an disregard its temporal variation. These techniques are also applicabl to sunspot data but besides the global treatment the most detaile Debrecen sunspot databases make also possible to scrutinize the interna structure and dynamics of the solar active regions. This means th identification of the subdomains of strongest horizontal gradients o the magnetic field and to track them with a temporal resolution of 1. hours. The detailed data allow to make flare forecast for different tim periods ahead, i.e. for the next couple of hours and days and with lowe reliability for the next rotation. These procedures make possible versatile system of flare forecast techniques. The program is supporte by ESA. LA - English DB - MTMT ER - TY - JOUR AU - Vörös, Zoltán AU - E., Yordanova TI - Twisted flux rope interactions in the solar wind JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/30923523 ID - 30923523 LA - English DB - MTMT ER - TY - JOUR AU - Leitzinger, Martin AU - Odert, Petra AU - Vida, Krisztián AU - Koller, Florian AU - Veronig, Astrid AU - Korhonen, Heidi AU - Guenther, Eike AU - Hanslmeier, Arnold AU - Temmer, Manuela AU - Dissauer, Karin AU - Greimel, Robert AU - Kriskovics, Levente AU - Lammer, Helmut TI - Stellar CMEs from an observational point of view JF - GEOPHYSICAL RESEARCH ABSTRACTS J2 - GEOPHYS RES ABSTR VL - 21 PY - 2019 SP - EGU2019-6786 SN - 1029-7006 UR - https://m2.mtmt.hu/api/publication/30917094 ID - 30917094 N1 - Poszter AB - Stellar activity is mainly characterized by the high energy phenomena such as outbreaks of radiation (flares) and sporadic expulsions o particles into the astrosphere termed coronal mass ejections (CMEs) Both phenomena are known to cause space weather in our solar system. O stars, flares and their parameters are well determined, in contrast t CMEs; their parameters are still not determined statistically. Bot phenomena may have severe effects on planetary atmospheres and, i addition, stellar CMEs may play an important role in stellar mass an angular momentum loss and therefore in stellar evolution. Flares ar directly detectable from photometric observations, whereas the detectio of CMEs requires different observational methods. CMEs have differen signatures in different wavelength regimes. Most of the stellar CME were detected so far using the method of Doppler-shifted Balmer flu which is accessible via spectroscopic measurements. Severa observational programs have been carried out and are planned for th future, including new observations and archival data. Also severa attempts to detect stellar CMEs via radio emission have been carried ou in the past decades. Finally, the X-ray regime may provide a valuabl data pool to look for so-called dimmings, well-known from the Sun, whic are closely related to CMEs and which are detectable in X-ray ligh curves. So far stellar CMEs have been detected rarely and only a handfu of distinct events is known, mainly for dMe stars. We report on past ongoing and future campaigns of stellar CMEs on F-, G-, K-, and M-typ pre- and main-sequence stars. LA - English DB - MTMT ER -