Radar surveys of the Rutford Ice Stream onset zone, West Antarctica: indications of flow (in)stability?

We present 1 and 100 MHz ground-based radar data from the onset region of Rutford Ice Stream, West Antarctica, which indicate the form and internal structure of isochrones. In the flow-parallel lines, modelled isochrone patterns reproduce the gross pattern of the imaged near-surface layers, assuming steady-state flow velocity from GPS records and the current accumulation rate for the last 200 years. We interpret this as indicating overall stability in flow in the onset region of Rutford Ice Stream throughout this period. However, in the cross-flow lines some local variability in accumulation is seen in areas close to the ice-stream margin where a number of tributaries converge towards the ice-stream onset zone. Episodic surface lowering events are observed followed by rapid fill episodes. The fill events indicate deposition towards the northwest, most likely generated by storm winds, which blow at an oblique angle to ice flow. More problematic is explaining the generation of episodic surface lowering in this area. We speculate this may be due 10: changing ice-flow direction in the complex tributary area of the onset zone; a change in basal sediments or sedimentary landforms; a change in basal melt rates or water supply; or episodic lake drainage events in the fjord systems of the Ellsworth Subglacial Highlands. The study highlights the difficulty of assessing flow stability in the complex onset regions of West Antarctic ice streams. read more

Members Of Lettuce, Pretty Lights, Antibalas, Toubab Krewe To Host Afro-Dub Soundclash In NOLA

first_imgJazz Fest is a celebration of all kinds of music from across the spectrum. People assume that jazz is the focus, but these days, the festival and the city’s related after-parties are a melting pot of styles and genres. Sure, there’s jazz, but also gospel, funk, jam and a healthy dose of world music. A few years ago, Luke Quaranta of Toubab Krewe decided that it was time to put the spotlight on West African music, and from that seed, JuJu Fest was born. JuJu Fest is a world music mini-festival-within-a-festival concept that takes place across the city of New Orleans during the ten days.This year, one show in particular tops the bill with a killer lineup and an awesome theme. Raja Kassis, guitar player of modern Afrobeat legends Antibalas (and co-founder of JuJu Fest) reached out to Borahm Lee (Break Science, Pretty Lights) and Josh Werner (Original Matisyahu band, Lee Scratch Perry, Wu-Tang Clan), two long time friends who all share a storied history playing Dub and Reggae music together, to create Megawatt: Afro-Dub Soundclash. This will certainly be an incredible night of dub, reggae and afro vibes that will hit The Maison on Wednesday, May 3rd. Joining them will be modern jazz/funk legend Adam Deitch (Lettuce, Break Science), master percussionist Weedie Braimah, local sax hero Khris Royal, and trumpet master Maurice “Mobetta” Brown.  As if it couldn’t get any better, Megawatt will be fronted on vocals by none other than Bajah, a superstar in Sierra Leone affectionately know back home as the “Lyrical Bomber.” Bajah has been a frequent guest in years past of such acts as Break Science, Talib Kweli and The Roots, to name a few.We can’t wait for Megawatt’s awesome Dub and Reggae grooves to reverberate up and down Frenchman Street on May 3rd. See below for full show details.SHOW INFO –Artist: Megawatt feat. Raja Kassis, Luke Quaranta, Adam Deitch, Borahm Lee, Josh Werner, Weedie Braimah, Bajah, Khris Royal & Maurice “Mobetta” BrownVenue: The Maison – 508 Frenchmen St, New Orleans, LA 70116Date: Wednesday, May 3rd, 2017 (technically early AM May 4th)Price: $20adv / $25dosTickets: Click HereTime: Doors 12:30am / Show 1:00amIf you’ll be down in New Orleans for Jazz Fest this year, don’t miss out on all of the awesome late night music options taking place across the city. Learn more about all of the amazing music you can catch at this link.last_img read more