Stereo methods using GOES-17 and Himawari-8 applied to the Hunga Tonga-Hunga Ha’apai volcanic plume on 15 January 2022 show overshooting tops reaching 50-55 km altitude, a record in the satellite era. Plume height is important to understand dispersal and transport in the stratosphere and climate impacts. Stereo methods, using geostationary satellite pairs, offer the ability to accurately capture the evolution of plume top morphology quasi-continuously over long periods. Manual photogrammetry estimates plume height during the...
BEDMAP2 - Ice thickness, bed and surface elevation for Antarctica - standardised shapefiles and geopackagesPeter Fretwell, Hamish Pritchard, David Vaughan, Jonathan Bamber, N. Barrand, R.E. Bell, C Bianchi, Robert Bingham, Donald Blankenship, G. Casassa, Ginny Catania, D. Callens, H Conway, Alison Cook, Hugh Corr, D Damaske, V. Damn, Fausto Ferraccioli, Rene Forsberg, S. Fujita, Y. Gim, P. Gogineni, J. Griggs, Richard Hindmarsh, P. Holmlund … & Julien Bodart
We present here the Bedmap2 ice thickness, bed and surface elevation aggregated points and survey lines. The aggregated points consist of statistically-summarised shapefile points (centred on a continent-wide 500 m x 500 m grid) that reports the average values of ice thickness, bed and surface elevation from the full-resolution survey data and information on their distribution. The points presented here correspond to the additional points to Bedmap1 used for the gridding of Bedmap2. The data...
In recent decades, Greenland’s peripheral glaciers have experienced large-scale mass loss, resulting in a substantial contribution to sea-level rise. Only 4% of Greenland’s ice cover are small peripheral glaciers that are distinct from the ice sheet proper. Despite comprising this relatively small area, these small peripheral glaciers are responsible for 11% of the ice loss associated with Greenland’s recent sea-level rise contribution. Using the satellite laser platforms ICESat and ICESat-2, we estimate that ice loss...
We present here the Bedmap2 ice thickness, bed and surface elevation standardised CSV data points that were used to create the Bedmap2 gridding products. The data consists of 25 million points coming from 68 individual surveys acquired in Antarctica. The associated datasets consist of: - Bedmap1 standardised CSV data points: https://doi.org/10.5285/f64815ec-4077-4432-9f55-0ce230f46029 - Bedmap3 standardised CSV data points: https://doi.org/10.5285/91523ff9-d621-46b3-87f7-ffb6efcd1847 - Bedmap2 statistically-summarised data points (shapefiles): https://doi.org/10.5285/0f90d926-99ce-43c9-b536-0c7791d1728b - Bedmap2 gridding products: https://doi.org/10.5285/fa5d606c-dc95-47ee-9016-7a82e446f2f2 This work is supported by...
We present here the Bedmap3 ice thickness, bed and surface elevation standardised CSV data points that are used to create the Bedmap3 gridding products in addition to the previous data releases. The data consists of 50 million points acquired by 17 different data providers in Antarctica. The associated datasets consist of: - Bedmap1 standardised CSV data points: https://doi.org/10.5285/f64815ec-4077-4432-9f55-0ce230f46029 - Bedmap2 standardised CSV data points: https://doi.org/10.5285/2fd95199-365e-4da1-ae26-3b6d48b3e6ac - Bedmap3 statistically-summarised data points (shapefiles): https://doi.org/10.5285/a72a50c6-a829-4e12-9f9a-5a683a1acc4a This work is...
BEDMAP3 - Ice thickness, bed and surface elevation for Antarctica - standardised shapefiles and geopackagesPeter Fretwell, Hamish Pritchard, Alice Fremand, Julien Bodart, A. Aitken, Jonathan Bamber, R.E. Bell, C Bianchi, Robert Bingham, Donald Blankenship, G. Casassa, Ginny Catania, K Christianson, H Conway, Hugh Corr, X. Cui, D Damaske, V. Damn, R. Drews, G. Eagles, O. Eisen, H. Eisermann, F Ferraccioli, Rene Forsberg, S Franke … & A. Zirizzotti
We present here the Bedmap3 ice thickness, bed and surface elevation aggregated points and survey lines. The aggregated points consist of statistically-summarised shapefile points (centred on a continent-wide 500 m x 500 m grid) that reports the average values of Antarctic ice thickness, bed and surface elevation from the full-resolution survey data and information on their distribution. The points presented here correspond to the added points since the last release of Bedmap2. The data comes...
Variability due to climate and chemistry in observations of oxygenated Earth-analogue exoplanets: Simulations and resultsGregory Cooke, Dan Marsh, Catherine Walsh, Sarah Rugheimer & Geronimo Villanueva
The Great Oxidation Event was a period during which Earth’s atmospheric oxygen (O2) concentrations increased from ~10−5 times its present atmospheric level (PAL) to near modern levels, marking the start of the Proterozoic geological eon 2.4 billion years ago. Using WACCM6, an Earth System Model, we simulate the atmosphere of Earth-analogue exoplanets with O2 mixing ratios between 0.1% and 150% PAL. Using these simulations, we calculate the reflection/emission spectra over multiple orbits using the Planetary...
We present here Bedmap2 (2013), a suite of gridded products describing surface elevation, ice-thickness and the sea floor and subglacial bed elevation of the Antarctic south of 60deg S. We derived these products using data from a variety of sources, including many substantial surveys completed since the original Bedmap compilation (Bedmap1) in 2001. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used...
Experiments on the snowfall, temperature, and humidity to the Arctic summer snowstorm using ocean-ice couple model (POP2-CICE5) with JRA55-do and MERRA2 forcingWon-Il Lim, Hyo-Seok Park, Alek. A. Petty & Kyong-Hwan Seo
In the Arctic, short-lived summer snowstorms can provide snow cover that can increase surface reflectivity and heat capacity. Despite their potential importance, little research has been done to understand the impact of summer snowstorms on basin-scale Arctic sea ice cover. Our observational analysis shows that a summer snowstorm event is accompanied by cyclonic ice drift, increases in surface albedo and surface air cooling that can persist for up to ~2 weeks, dampening sea ice loss....
Forests are often exposed to regular, non-severe winds (chronic wind exposure), yet the effect of such winds on canopy structure in tropical forests remains understudied. The height and structural complexity of a forest canopy are strongly and positively correlated with biodiversity and carbon accumulation. Understanding the drivers of canopy structural complexity across broad environmental gradients can therefore improve the mapping and modeling of diversity and carbon dynamics. Here we predict the height and structural complexity...
Earth and Space Sciences, University of Washington5
Institute for Geophysics, Jackson School of Geosciences, University of Texas5
Istituto Nazionale di Geofisica e Vulcanologia5
NASA Wallops Flight Facility5
Centro de Estudios Cientificos5
Goddard Space Flight Center5
NASA Goddard Space Flight Center5
Institute for Geology and Mineral Resources of the World Ocean5
University of Edinburgh5