Abstract Melting at the base of Antarctic Ice Sheet influences ice dynamics and our ability to recover ancient climatic records from deep cores. Basal melt rates are affected by geothermal flux, one least constrained properties continent. Estimates flux typically regional in nature, derived geological, magnetic or seismic data, sparse point measurements core sites. We analyse ice-penetrating radar data upstream South Pole revealing a ~100 km long 50 wide area where internal sheet layers...

An airborne gravity survey was conducted over Taiwan using a LaCoste and Romberg (LCR) System II air‐sea gravimeter with global positioning system (GPS) data sampled at 1 Hz. The aircraft trajectories were determined GPS network kinematic adjustment relative to eight tracking stations. Long‐wavelength errors in position are reduced when doing numerical differentiations for velocity acceleration. A procedure computing resolvable wavelength of error‐free gravimetry is derived. accuracy...

The tectonic history of the Arctic Ocean remains poorly resolved and highly controversial. Details regarding break up Lomonosov Ridge from Barents‐Kara shelf margins establishment seafloor spreading in Cenozoic Eurasia Basin are unresolved. Significantly, plate evolution Mesozoic Amerasia is essentially unknown. north Greenland at a critical juncture that formed locus three‐plate setting between Ridge, Greenland, North America. In addition, area close to European plate, resulting complicated...

Airborne geoid mapping techniques may provide the opportunity to improve over vast areas of Earth, such as polar areas, tropical jungles and mountainous an accurate "seam-less" model across most coastal regions. Determination by airborne methods relies on development gravimetry, which in turn is dependent developments kinematic GPS. Routine accuracy gravimetry are now at 2 mGal level, translate into 5–10 cm regional scales. The error behaviour well-suited for determination, with...

Abstract Long-range airborne geophysical measurements were carried out in the ICEGRAV campaigns, covering hitherto unexplored parts of interior East Antarctica and part Antarctic Peninsula. The surveys provided a regional coverage gravity, magnetic ice-penetrating radar for major Dronning Maud Land ice stream systems, from grounding lines up to Recovery Lakes drainage basin, filled data voids compilations, such as AntGP gravity data, ADMAP BEDMAP2 thickness sub-ice topography. We present...

Rice paddies are among the most important cultivated areas globally both in terms of food security and greenhouse gas (GHG) emissions. estimated to contribute approximately 10% anthropogenic CH4 emissions also potential hot spots for N2O However, emission estimates highly uncertain as observational data consist primarily manual, static closed chamber measurements combined with chromatography. This methodology is time consuming sets limitations on number observations over time, which...

Inertial navigation systems and gravimeters are now routinely used to map the regional gravitational quantities from an aircraft with mGal accuracy a spatial resolution of few kilometers. However, airborne gravimeter this kind is limited by inaccuracy inertial sensor performance, integrated technique kinematic acceleration determination. As GPS developed, vehicle determination no longer limiting factor in gravity due cancellation common mode differential mode. A new taking full advantage...

In recent years, the use of a strapdown Inertial Measurement Unit (IMU) for airborne gravimetry has proven itself to be an accurate and resilient measurement system, improving operational flexibility. The main concern is erroneous long-wavelength information in resulting estimates, which suspected originate from uncompensated long-term drift accelerometers, probably originating temperature variation. For this reason, iMAR navigation designed stabilisation box, allows their IMU systems. On...

Abstract This paper describes the development of a new geoid-based vertical datum from airborne gravity data, by Department Survey and Mapping Malaysia, on land in South China Sea out coast East Malaysia region, covering an area about 610,000 square kilometres. More than 107,000 km flight line data over marine areas has been combined to provide seamless land-to-sea field coverage; with estimated accuracy better 2.0 mGal. The iMAR-IMU processed anomaly used during 2014-2016 survey extend...

The Military Survey Department (MSD) of the United Arab Emirates (UAE) undertook an airborne gravity survey project for marine area country in 2009, especially to strengthen and coastal geoid near-shore regions. For survey, 5 km spacing coast-parallel flight lines were planned surveyed. These supplemented by cross-lines order assess quality surveys. extended 10 km, further offshore. A Beech King Air 350 aircraft was used surveys, collecting data at a typical speed 170 knots elevation...

Abstract The region of Recovery Glacier, Slessor and Bailey Ice Stream, East Antarctica, has remained poorly explored, despite representing the largest potential contributor to future global sea level rise on a centennial millennial time scale. Here we use new airborne radar data improve knowledge about bed topography investigate controls fast ice flow. Glacier is underlain by an 800 km long trough. Its flow controlled subglacial water in its upstream downstream region. Fast presence rough...

The Recovery subglacial basin, with its largest glacier Glacier, has been identified as potentially the biggest contributor to future sea level rise from East Antarctica. Subglacial lakes along main trunk have detected satellite data, four giant (Recovery Lakes A, B, C, and D) located at onset of fast ice flow (≥15 m/yr) multiple smaller glacier. presence water plays a key role in control Glacier. We present new insights on airborne radar data collected 2013 2015. Using an adjusted...

In this paper we outline the principles of downward continuation and geoid determination in Mongolia, based on 2004-5 airborne gravity survey, surface gravimetry from various sources, detailed digital terrain models satellite radar interferometry (SRTM). A remove-restore method is used for global spherical harmonic reference models, with residual field signal continued by least-squares collocation, quasi-geoid computed Fourier methods. For a GRACE EGM96 combination used, assessed using...

An airborne gravimeter is one of the most important tools for gravity data collection over large areas with mGal accuracy and a spatial resolution several kilometers. In August 2012, flight test was carried out to determine feasibility assess new Chinese SGA-WZ strapdown in Greenland, an area good coverage from earlier marine surveys. overview this system given, including design, sensor performance processing. The processing includes 160 s length finite impulse response filter, corresponding...

ABSTRACT Airborne gravimetry is an important method for measuring gravity over large unsurveyed areas. This technology has been widely applied in Canada, Antarctica and Greenland to map the fields of these regions recent years, oil industry. In 2005, two tests Italian area were performed by ENI cooperation with Politecnico di Milano Danish National Space Center. To knowledge authors, first experiments this kind Italy Ionian coasts Calabria Maiella Mountains. The test field characterized...

Abstract Hypothesized drawdown of the East Antarctic Ice Sheet through “bottleneck” zone between and West Antarctica would have significant impacts for a large proportion Sheet. Earth observation satellite orbits sparseness radio echo sounding data restricted investigations basal boundary controls on ice flow in this region until now. New airborne surveys reveal complex topography high relief beneath southernmost Weddell/Ross divide, with three subglacial troughs connecting interior to...