HFI L2 DPC destripping and mapmaking modules

PoS(CMB2006)049International audienceThe data processing of the data from the High Frequency Instrument (HFI) of the Planck mission will use several modules. Destriping is expected to play a central role in the mapmaking stage. This paper outlines two existing HFI l2 DPC destriping modules together with estimations of their performances. MOKAPIX is a temperature data destriping tool based on scanning redundancies on the sky. We have developped another modules, BOGOPIX , based on the same philosophy, to perform simultaneously destriping and relative intercalibration

Exercices de martelage et suivi sylvicole sur martelage.sylvotheque.ch (MSC)

martelage.sylvotheque.ch (MSC) est une plateforme informatique pour s’exercer au martelage dans plus de 50 situations différentes. Elle intègre une ocumentation non seulement chiffrée, mais aussi des photosphères, permettant de comparer l’état avant et après l’intervention et ainsi d’effectuer un suivi de l’effet et de l’efficacité des interventions sylvicoles. Elle est utile aussi bien à la formation continue, à la communication grand public, ou encore comme outil d’optimisation de la gestion sylvicole destiné aux entreprises forestières.Anzeichnungsübungen und waldbauliches Monitoring auf martelage. sylvotheque.ch (MSC) Die Plattform martelage.sylvotheque.ch (MSC) kombiniert Anzeichnungsübungen in Marteloskopen mit 360°-Fotografien (sog. Fotosphären). Mittlerweile sind über 50 Touren eingestellt (v.a. über die Durchforstung, aber auch die Verjüngung im Femelschlagbetrieb und im Dauerwald). Beginnt man eine Tour, erscheinen auf der linken Bildschirmhälfte die allgemeinen Informationen zur Tour sowie zwei interaktive Karten (die eine zur Lokalisierung der Tour und die andere mit der Position der Bäume) und auf der rechten Bildschirmhälfte die Fotosphären, mit denen man die jeweilige Waldfläche von verschiedenen Positionen aus betrachten kann. Die Benutzer können eine Anzeichnung durchführen und erhalten eine Auswertung dazu. So können sie den Zustand des Waldes vor und nach der Anzeichnung vergleichen. Das MSC kann in Lehre, Weiterbildung und Öffentlichkeitsarbeit eingesetzt werden

DOC concentration peaks driven by water table increases at the outlet of mountainous peatlands

International audiencePeatlands in mountains are small and patchy. However, they are biogeochemical hotspots for carbon cycle, and disproportionally contribute to organic carbon transfer to headwater streams. In a harsh mountainous climatic and hydrologic context, this study aims at identifying parameters controlling DOC concentration fluctuations at the outlet of peatlands. In the French Pyrenees, the variability of the DOC concentration was investigated at the outlet of a fen site (1343 m.a.s.l., 4,7 ha) for four years, and at the outlet of a bog site (706 m.a.s.l, 5,3 ha) for a year and a half. High frequency (30 min) in situ fDOM (fluorescence of dissolved organic matter) sensors were deployed as proxies for DOC concentration. To identify controlling factors on DOC concentration, high frequency data including meteorological parameters and stream discharge were collected at both sites. Water table level and the water temperature were also monitored at a high frequency in piezometers wells at different representative locations in each peatland. High frequency monitoring reveals a strong variability in DOC concentration at both sites. Most of this variability is related to short (∼30 hours) DOC concentration peaks initiated by precipitation events. Lower mean DOC concentration (1.8 mg.L-1) but stronger DOC increases (5,1 times mean concentration) are observed at the fen site compared to the bog site (mean concentration of 5.9 mg.L-1, and increases of 1,8 times). At both sites, DOC concentration increases are not proportional to the discharge increases observed at the outlet. However, peak analysis reveals that DOC concentration increases are linearly correlated to the averaged water table rises of the whole site. The slope of the linear models differs between sites. Master recession curve analysis was used to classify water table signals from each piezometer well depending on their hydraulic conductivity. This highlights clear differences in hydraulic conductivity between the bog and the fen sites, explaining their different DOC concentration peak models. Fen are flashy systems, characterized by low baseline DOC and strong peaks, when bog sustain higher baseline DOC concentrations but weaker peaks. Whatever peatland types, this study shows that re-wetting of the non-saturated peat layer is a key factor in the DOC transfer processes from peatland to stream in mountainous watersheds

<i>Teflon</i> Magnetic Stirring Capsules (TMSC) as a Practical and Reusable Delivery System for Sensitive Reagents and Catalysts

The development of a user-friendly reusable laboratory equipment for the delivery of sensitive reagents and catalysts is described. The tightness of these Teflon Magnetic Stirring Capsules (TMSC) is ensured by the magnetic force and release of the reagent inside the solution is triggered by adjusting the stirring rate so that the centrifuge force exceeds the magnetic force. They can be loaded with several chemicals at the same time and do operate across a broad range of temperatures. The inertness of Teflon facilitates reaction purification

Exports of stream organic carbon from two Pyrenean peatlands and potential anthropogenic impacts

International audienc

Exports of stream organic carbon from two Pyrenean peatlands and potential anthropogenic impacts

International audienc

DOC concentration peaks driven by water table increases at the outlet of mountainous peatlands

International audiencePeatlands in mountains are small and patchy. However, they are biogeochemical hotspots for carbon cycle, and disproportionally contribute to organic carbon transfer to headwater streams. In a harsh mountainous climatic and hydrologic context, this study aims at identifying parameters controlling DOC concentration fluctuations at the outlet of peatlands. In the French Pyrenees, the variability of the DOC concentration was investigated at the outlet of a fen site (1343 m.a.s.l., 4,7 ha) for four years, and at the outlet of a bog site (706 m.a.s.l, 5,3 ha) for a year and a half. High frequency (30 min) in situ fDOM (fluorescence of dissolved organic matter) sensors were deployed as proxies for DOC concentration. To identify controlling factors on DOC concentration, high frequency data including meteorological parameters and stream discharge were collected at both sites. Water table level and the water temperature were also monitored at a high frequency in piezometers wells at different representative locations in each peatland. High frequency monitoring reveals a strong variability in DOC concentration at both sites. Most of this variability is related to short (∼30 hours) DOC concentration peaks initiated by precipitation events. Lower mean DOC concentration (1.8 mg.L-1) but stronger DOC increases (5,1 times mean concentration) are observed at the fen site compared to the bog site (mean concentration of 5.9 mg.L-1, and increases of 1,8 times). At both sites, DOC concentration increases are not proportional to the discharge increases observed at the outlet. However, peak analysis reveals that DOC concentration increases are linearly correlated to the averaged water table rises of the whole site. The slope of the linear models differs between sites. Master recession curve analysis was used to classify water table signals from each piezometer well depending on their hydraulic conductivity. This highlights clear differences in hydraulic conductivity between the bog and the fen sites, explaining their different DOC concentration peak models. Fen are flashy systems, characterized by low baseline DOC and strong peaks, when bog sustain higher baseline DOC concentrations but weaker peaks. Whatever peatland types, this study shows that re-wetting of the non-saturated peat layer is a key factor in the DOC transfer processes from peatland to stream in mountainous watersheds

Dataset for Teflon Magnetic Stirring Capsules (TMSC) as a Practical and Reusable Delivery System for Sensitive Reagents and Catalysts

Abstractdataset for publication 7

Asymmetric synthesis of ibuprofen via diastereoselective alkylation of a homochiral N-acylbornanesultam

A very short, 4 step synthesis of 2-(4-isobutylphenyl)propionic acid (ibuprofen) was achieved in 57% overall yield, using a highly diastereoselective alkylation of the chiral enolate derived from N-(4-isobutylphenyl)acetyl bornanesultam as a key step