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17 results on '"Tuckett, Peter A."'

1. Short- and long-term variability of the Antarctic and Greenland ice sheets

Author

Hanna, Edward, Topál, Dániel, Box, Jason E., Buzzard, Sammie, Christie, Frazer D. W., Hvidberg, Christine, Morlighem, Mathieu, De Santis, Laura, Silvano, Alessandro, Colleoni, Florence, Sasgen, Ingo, Banwell, Alison F., van den Broeke, Michiel R., DeConto, Robert, De Rydt, Jan, Goelzer, Heiko, Gossart, Alexandra, Gudmundsson, G. Hilmar, Lindbäck, Katrin, Miles, Bertie, Mottram, Ruth, Pattyn, Frank, Reese, Ronja, Rignot, Eric, Srivastava, Aakriti, Sun, Sainan, Toller, Justin, Tuckett, Peter A., and Ultee, Lizz

Published
2024
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2. The distribution and evolution of Antarctic surface meltwater

Author

Tuckett, Peter, Ely, Jeremy, Sole, Andrew, Livingstone, Stephen, and Lea, James

Abstract

Mass losses from the Antarctic Ice Sheet are the largest uncertainty in predicting sea level rise. The role of surface meltwater in determining Antarctic sea level contribution is poorly understood, despite its potential to impact ice sheet mass balance via a number of mechanisms and feedbacks. This thesis uses novel methodologies, implemented within Google Earth Engine, to study the distribution and evolution of Antarctic surface meltwater at unprecedented spatial and temporal scales. An automated method for mapping surface meltwater is firstly developed and applied to the Amery Ice Shelf, and then at a continent-wide scale. The method overcomes previous challenges relating to data processing capability and variability in optical satellite image visibility, enabling the production of robust, continuous time series of surface meltwater area. The first continent-wide dataset of surface meltwater, spanning 2006 to 2021, reveals a significant increasing trend in surface meltwater area across East Antarctica since 2006. For the first time, clear links between surface meltwater area and large-scale modes of atmospheric variability are demonstrated, although these cannot explain the increasing trend observed in East Antarctica. Instead, this increase is likely a consequence of ice surfaces becoming more favourable to meltwater ponding. This thesis also explores novel techniques for improving quantification of surface meltwater volumes. A multi-satellite approach is applied to improve the temporal resolution of volume data, revealing a variety of mechanisms via which supraglacial lakes evolve at the Amery Ice Shelf. Combined automated and manual analysis additionally reveals the importance of melt-albedo feedbacks in controlling the spatial distribution of meltwater in the region. The complexity of meltwater processes motivates future studies to explore drivers and impacts of meltwater at a regional scale, including assessments of ice shelf vulnerability. Furthermore, the greater abundance of surface meltwater on grounded ice than previously realised raises questions regarding the potential for meltwater to reach the subglacial environment and impact grounded ice flow. Increased understanding of these mechanisms, perhaps facilitated by the findings of this thesis, will help elucidate the role of surface meltwater in the future of the Antarctic Ice Sheet.

Published
2023

3. Short- and long-term variability of the Antarctic and Greenland ice sheets

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Hanna, Edward, Topál, Dániel, Box, Jason E., Buzzard, Sammie, Christie, Frazer D.W., Hvidberg, Christine, Morlighem, Mathieu, De Santis, Laura, Silvano, Alessandro, Colleoni, Florence, Sasgen, Ingo, Banwell, Alison F., van den Broeke, Michiel R., DeConto, Robert, De Rydt, Jan, Goelzer, Heiko, Gossart, Alexandra, Gudmundsson, G. Hilmar, Lindbäck, Katrin, Miles, Bertie, Mottram, Ruth, Pattyn, Frank, Reese, Ronja, Rignot, Eric, Srivastava, Aakriti, Sun, Sainan, Toller, Justin, Tuckett, Peter A., Ultee, Lizz, Sub Dynamics Meteorology, Marine and Atmospheric Research, Hanna, Edward, Topál, Dániel, Box, Jason E., Buzzard, Sammie, Christie, Frazer D.W., Hvidberg, Christine, Morlighem, Mathieu, De Santis, Laura, Silvano, Alessandro, Colleoni, Florence, Sasgen, Ingo, Banwell, Alison F., van den Broeke, Michiel R., DeConto, Robert, De Rydt, Jan, Goelzer, Heiko, Gossart, Alexandra, Gudmundsson, G. Hilmar, Lindbäck, Katrin, Miles, Bertie, Mottram, Ruth, Pattyn, Frank, Reese, Ronja, Rignot, Eric, Srivastava, Aakriti, Sun, Sainan, Toller, Justin, Tuckett, Peter A., and Ultee, Lizz

Published
2024

14. NA

Author

Tuckett, Peter J. F.

Subjects
NA, Management
Abstract

http://archive.org/details/militarymanpower1094517130 NA NA

Published
1974

15. Military Manpower Planning: A Responsive Approach.

Author

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF, Tuckett,Peter J. F., NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF, and Tuckett,Peter J. F.

Abstract

One of the recurring problems in military manpower planning is the balancing of the need for a lengthy period of training and development of a career force against the requirement that the force structure be capable of relatively short-term fluctuations to meet political and other requirements. This problem is examined in terms of a hypothetical force model of six components. These components have been selected by dividing the force into junior, middle and senior groupings and then viewing each group in terms of officers and other ranks. While recognizing the interdependence of segments, each has been studied separately and potential management policies and procedures are suggested for them. The policies and procedures recommended are based on the personal needs of the individuals under study and a knowledge and the theoretical and research findings in the fields of motivation and career development.

Published
1974

17. Surface meltwater causes large and rapid accelerations of Antarctic Peninsula outlet glaciers.

Author

Ely, Jeremy, Tuckett, Peter, Sole, Andrew, Livingstone, Stephen, Davison, Benjamin, van Wessem, Jan Melchior, and Howard, Joshua

Subjects
*MELTWATER, *GLACIERS, *ICE shelves, *ANTARCTIC ice, *ICE sheets, ANTARCTIC glaciers
Abstract

Surface meltwater is widespread across the Antarctic Ice Sheet. While much recent research has focused on understanding the impact meltwater has on ice shelves, where its presence can act as a catalyst for rapid ice shelf break up, the effect of meltwater on grounded ice dynamics in Antarctica remains unknown. Using high-resolution ice velocity data derived from Sentinel 1 imagery we identify previously unobserved large (up to 100% greater than the annual mean), sudden, and synchronous accelerations in ice flow at 5 glaciers across the Antarctic Peninsula, which occur during modelled periods of surface melt. Coincident optical satellite imagery demonstrates that although much of the surface meltwater refreezes, some water appears to access the bed through crevasses and surface lake drainage. Several characteristics of the ice accelerations are consistent with the enhancement of basal motion by surface-derived meltwater reaching the ice bed. Firstly, speed-up events are often followed by short-lived reductions in ice velocity to pre-event values, and secondly, their relative magnitude is greater in regions of observed surface melt, immediately downstream of surface lake drainage events and after prolonged periods of no-or-little melt. Our data suggest that following arrival at the ice bed, meltwater is efficiently evacuated, limiting the duration of speed-up events to less than 6 days (the temporal resolution of our data). Although Antarctic Peninsula speed-up events are currently short-lived, we anticipate that predicted longer and more intense melt-seasons may lead to a shift in ice-dynamics in the region. [ABSTRACT FROM AUTHOR]

Published
2019

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