"Energy transfers in surface wave-averaged equations"

Ocean surface gravity waves play an important role for the air-sea momentum fluxes and the upper ocean mixing, and knowledge of the sea state leads in general circulation models to improved estimates of the ocean energy budget and allows to incorporate surface wave impacts, such as Langmuir turbulence. However, including the Stokes drift, in phase-averaged equations for the Eulerian mean motion leads to an Eulerian energy budget which is physically difficult to interpret. In this note, we show that a Lagrangian energy budget allows for a closed energy budget, in which all terms connecting the different energy compartments correspond to well known energy transfer terms. We show that the so-called Coriolis-Stokes force does not lead to an energy transfer between surface gravity waves and oceanic mean motions as previously suggested. In an energy budget for the Lagrangian mean kinetic energy, the work done by the Coriolis-Stokes force does not contribute, and should be used to estimate the kinetic energy balance in the wave affected surface mixed layer. The Lagrangian energy budget is used to discuss an energetically consistent framework, which can be used to couple a general circulation ocean model to a surface wave model.Comment: 33 pages, 7 figures, submitted to J. Phys. Oceanog

Die proximale Humerusfraktur: ist die Operation immer die beste Wahl

Hintergrund Proximale Humerusfrakturen gehören zu den dritthäufigsten, osteoporotischen Verletzungen mit steigender Inzidenz. Die Indikationsstellung wird weiterhin kontrovers diskutiert. Ziel unserer Studie war es herauszufinden, ob der Trend zur konservativen Therapie gerechtfertigt ist und sich hiermit v. a. beim geriatrischen Patienten vergleichbare, reproduzierbare Ergebnisse erreichen lassen. Material und Methoden In die retrospektive Single-center-Studie wurden 128 Patienten mit konservativer und kopferhaltender operativer Therapie zwischen 2013 und 2015 eingeschlossen und davon wurden 91 nachuntersucht. Demografische Daten, operative Versorgung sowie Komplikationen wurden erhoben. Eine Follow-up-Untersuchung fand statt, in der Subjective Shoulder Value (SSV), visuelle Analogskala (VAS), Disability of Arm, Shoulder and Hand Questionnaire (DASH), Constant Murley Score (CMS) und Bewegungsausmaß erhoben wurden. Eine radiologische Auswertung wurde durchgeführt. Ergebnisse In den Scores wurden folgende Ergebnisse für konservative und operative Therapie erzielt (konservativ: VAS Schmerz 8,9 Punkte, CMS abs. 70,7 Punkte, DASH: 16,5 Punkte; operativ: VAS Schmerz 1,7 Punkte, CMS abs. 63,5 Punkte, DASH: 24,2 Punkte). Es zeigte sich kein signifikanter Unterschied zwischen Nagel- und Plattenosteosynthese. Die Komplikationsrate betrug 20 %. Die konservative Gruppe erzielte ein besseres Bewegungsausmaß. Die dislozierten Frakturen waren auffallend, wenngleich nicht statistisch signifikant schlechter im Vergleich zu den Neer-1-Frakturen und nur leichtgradig schlechter als die operativ versorgten Patienten. Schlussfolgerung Die Behandlung der proximalen Humerusfraktur bleibt weiterhin eine individuelle Entscheidung abhängig von Funktionsanspruch, Alter und Komorbiditäten. Die konservative Therapie kann in Erwägung gezogen werden, teils auch bei formell bestehender Operationsindikation (v. a. 2‑ und 3‑Part-Frakturen), da sich hiermit vergleichbare Langzeitergebnisse mit hoher Patientenzufriedenheit und reduziertem (perioperativem) Risiko erzielen lassen

On the Driving Mechanism of the Annual Cycle of the Florida Current Transport

The mechanisms involved in setting the annual cycle of the Florida Current transport are revisited using an adjoint model approach. Adjoint sensitivities of the Florida Current transport to wind stress reproduce a realistic seasonal cycle with an amplitude of ~1.2 Sv (1 Sv ≡ 106 m3 s−1). The annual cycle is predominantly determined by wind stress forcing and related coastal upwelling (downwelling) north of the Florida Strait along the shelf off the North American coast. Fast barotropic waves propagate these anomalies southward and reach the Florida Strait within a month, causing an amplitude of ~1 Sv. Long baroclinic planetary Rossby waves originating from the interior are responsible for an amplitude of ~0.8 Sv but have a different phase. The sensitivities corresponding to the first baroclinic mode propagate westward and are highly influenced by topography. Considerable sensitivities are only found west of the Mid-Atlantic Ridge, with maximum values at the western shelf edge. The second baroclinic mode also has an impact on the Florida Current variability, but only when a mean flow is present. A second-mode wave train propagates southwestward from the ocean bottom on the western side of the Mid-Atlantic Ridge between ~36° and 46°N and at Flemish Cap, where the mean flow interacts with topography, to the surface. Other processes such as baroclinic waves along the shelf and local forcing within the Florida Strait are of minor importance

Comprehensive Research Synopsis and Systematic Meta-Analyses in Parkinson's Disease Genetics: The PDGene Database

More than 800 published genetic association studies have implicated dozens of potential risk loci in Parkinson's disease (PD). To facilitate the interpretation of these findings, we have created a dedicated online resource, PDGene, that comprehensively collects and meta-analyzes all published studies in the field. A systematic literature screen of ∼27,000 articles yielded 828 eligible articles from which relevant data were extracted. In addition, individual-level data from three publicly available genome-wide association studies (GWAS) were obtained and subjected to genotype imputation and analysis. Overall, we performed meta-analyses on more than seven million polymorphisms originating either from GWAS datasets and/or from smaller scale PD association studies. Meta-analyses on 147 SNPs were supplemented by unpublished GWAS data from up to 16,452 PD cases and 48,810 controls. Eleven loci showed genome-wide significant (P<5×10−8) association with disease risk: BST1, CCDC62/HIP1R, DGKQ/GAK, GBA, LRRK2, MAPT, MCCC1/LAMP3, PARK16, SNCA, STK39, and SYT11/RAB25. In addition, we identified novel evidence for genome-wide significant association with a polymorphism in ITGA8 (rs7077361, OR 0.88, P = 1.3×10−8). All meta-analysis results are freely available on a dedicated online database (www.pdgene.org), which is cross-linked with a customized track on the UCSC Genome Browser. Our study provides an exhaustive and up-to-date summary of the status of PD genetics research that can be readily scaled to include the results of future large-scale genetics projects, including next-generation sequencing studies

Large-scale analyses of common and rare variants identify 12 new loci associated with atrial fibrillation

Atrial fibrillation affects more than 33 million people worldwide and increases the risk of stroke, heart failure, and death. Fourteen genetic loci have been associated with atrial fibrillation in European and Asian ancestry groups. To further define the genetic basis of atrial fibrillation, we performed large-scale, trans-ancestry meta-analyses of common and rare variant association studies. The genome-wide association studies (GWAS) included 17,931 individuals with atrial fibrillation and 115,142 referents; the exome-wide association studies (ExWAS) and rare variant association studies (RVAS) involved 22,346 cases and 132,086 referents. We identified 12 new genetic loci that exceeded genome-wide significance, implicating genes involved in cardiac electrical and structural remodeling. Our results nearly double the number of known genetic loci for atrial fibrillation, provide insights into the molecular basis of atrial fibrillation, and may facilitate the identification of new potential targets for drug discovery