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Author: Steven John Rutherford Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The Seasonal Ice Zone Experiment (SIZEX), conducted in January 1992, was designed as the European Space Agency's ERS-1 synthetic-aperature radar (SAR) validation experiment. The satellite was placed in a three day exact repeat orbit, with ascending and descending passes which crossed the Greenland Sea marginal ice zone. In conjunction with SAR imagery collected by the Nansen Environmental and Remote Sensing Center, the research vessel Hakon Mosby recorded meteorological data on station near the ice edge. The marginal ice zone was subjected to atmospheric and oceanographic forcing during the 7-16 January period which resulted in significant changes in ice edge morphology. As intense low pressure systems propagated across the Greenland Sea, strong easterly and northerly winds dominated oceanographic forcing and created a compact ice edge which correlated with the 50% ice concentration isopleth from the SSM/I passive microwave sensor. Conversely, during periods of weak atmospheric forcing, the ice edge became diffuse and the ice edge morphology was determined by a variety of oceanic circulations. In this instance the actual ice edge position was well correlated with a 30% concentration isopleth.
Author: Steven John Rutherford Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The Seasonal Ice Zone Experiment (SIZEX), conducted in January 1992, was designed as the European Space Agency's ERS-1 synthetic-aperature radar (SAR) validation experiment. The satellite was placed in a three day exact repeat orbit, with ascending and descending passes which crossed the Greenland Sea marginal ice zone. In conjunction with SAR imagery collected by the Nansen Environmental and Remote Sensing Center, the research vessel Hakon Mosby recorded meteorological data on station near the ice edge. The marginal ice zone was subjected to atmospheric and oceanographic forcing during the 7-16 January period which resulted in significant changes in ice edge morphology. As intense low pressure systems propagated across the Greenland Sea, strong easterly and northerly winds dominated oceanographic forcing and created a compact ice edge which correlated with the 50% ice concentration isopleth from the SSM/I passive microwave sensor. Conversely, during periods of weak atmospheric forcing, the ice edge became diffuse and the ice edge morphology was determined by a variety of oceanic circulations. In this instance the actual ice edge position was well correlated with a 30% concentration isopleth.
Author: Steven John Rutherford Publisher: ISBN: Category : Languages : en Pages : 81
Book Description
The Seasonal Ice Zone Experiment (SIZEX), conducted in January 1992, was designed as the European Space Agency's ERS-1 synthetic-aperature radar (SAR) validation experiment. The satellite was placed in a three day exact repeat orbit, with ascending and descending passes which crossed the Greenland Sea marginal ice zone. In conjunction with SAR imagery collected by the Nansen Environmental and Remote Sensing Center, the research vessel Hakon Mosby recorded meteorological data on station near the ice edge. The marginal ice zone was subjected to atmospheric and oceanographic forcing during the 7-16 January period which resulted in significant changes in ice edge morphology. As intense low pressure systems propagated across the Greenland Sea, strong easterly and northerly winds dominated oceanographic forcing and created a compact ice edge which correlated with the 50% ice concentration isopleth from the SSM/I passive microwave sensor. Conversely, during periods of weak atmospheric forcing, the ice edge became diffuse and the ice edge morphology was determined by a variety of oceanic circulations. In this instance the actual ice edge position was well correlated with a 30% concentration isopleth.
Author: Larry D. Phegley Publisher: ISBN: Category : Marine meteorology Languages : en Pages : 92
Book Description
This thesis summarizes meteorological conditions occurring in the Marginal Ice Zone Experiment (MIZEX-84), conducted in the East Greenland Sea during the summer of 1984, are summarized. It includes a discussion of the synoptic and mesoscale conditions. The three cases discussed are: a weak storm which filled over the marginal ice zone (MIZ); an intense storm which transited the MIZ and entered the polar basin; and an undisturbed case. The MIZEX-84 period can be divided into three synoptic time periods. The first and the last were situations when the storms passed to the south and east of the Fram Striates. During the middle period the storms passed through the straits in response to the development of a closed upper-level low over the north coast of Greenland. Three of the four storms which moved into the straits were moving north-northwest and filled or slowed significantly in the MIZ. The fourth was moving parallel to the MIZ. This would seem to show that the MIZ does not dominate but may affect storm movement. Keywords: Arctic Marginal Ice Zone. (Theses).
Author: W. D. Hibler (III.) Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The main goal of the marginal ice zone experiment (MIZEX) is to understand the processes that dictate the advance and retreat of the ice margin. Mechanistic model sensitivity studies can greatly aid in this goal by identifying the relative importance of different processes in the total system. In addition, more complete simulation models can be used both to test the adequacy of current understanding of the marginal ice zone and to serve as an integrating device for complex data sets. This volume contains the main results from a MIZEX modeling workshop held 18-20 October in Hanover, New Hampshire. Modelers interested in both Arctic and Antarctic sea ice were present. The purpose of the workshop was to determine the status of marginal ice zone modeling and to discuss different views on modeling processes in the MIZ. Results from full simulation models, mechanistic models, and empirical statistical models were presented and discussed. In addition, recommendations relevant to experimental measurements were made. The recommendations were divided into ocean, ice, and atmospheric categories; these were also the three main subject areas covered by the presentations. Overall, the workshop helped to identify areas where further simulations are needed to test our understanding and where knowledge of certain processes is lacking.
Author: J. A. McNitt Publisher: ISBN: Category : Languages : en Pages : 129
Book Description
This thesis summarizes the Marginal Ice Zone Experiment (MIZEX-83) conducted in the Arctic during the summer of 1983 and describes the mesoscale features and atmospheric refraction conditions. The three case studies examined are: warm air advection over dense pack ice causing strong elevated ducting and subrefraction; cold air advection over relatively open water causing shallow convection and normal refraction conditions; and large scale subsidence in the western quadrants of an anticyclone leading to super-refraction and weak ducting. Developing synoptic scale cyclones adjacent to the MIZEX-83 area often determined the airflow over the region. The observed large horizontal sea surface temperature gradients were the dominant forcing mechanisms on surface layer stability. Trapping layers associated with subsidence inversions can be located on satellite imagery by assuming that stratiform clouds form immediately below the inversion. Uniform cloud and refraction layers were not common during MIZEX-83 due to strong mesoscale variability. Factors affecting inversion height include subsidence and entrainment mixing. Bulk Richardson number value for locations over the open water and pack ice show significant variability in stability conditions across the MIZ. Keywords: Fram Strait; East Greenland Sea; ABL mixing; and Atmospheric boundary layer.
Author: Karl L. Dinkler Publisher: ISBN: Category : Boundary layer (Meteorology) Languages : en Pages : 0
Book Description
The vertical structure of the atmospheric boundary layer in the East Greenland Sea/Fram Strait marginal ice zone (MIZ) is examined for various wind flow regimes with respect to the ice edge. Rawinsonde profiles and surface observations collected from three ships during MIZEX-87 (20 March - 11 April 1987) served as the data set for the examination. Three specific flow regimes are discussed: On-ice flow, off-ice flow, and flow parallel to the ice. On-ice flow resulted in deep, moist mixed layers capped by high weak inversions at the MIZ. Off-ice flow resulted in multiple surface and elevated inversions, with specific humidity highest within an elevated lower-tropospheric layer and dry regions near the surface and aloft. Parallel flow led to the development of strikingly different boundary layer regimes separated by the ice edge: Over ice, deep surface and elevated inversions were associated with alternating moist and dry layers in the lower troposphere; over water, multiple elevated inversions were associated with an elevated lower-tropospheric moist layer and dry regions near the surface and alot. Possible physical processes important for the development of the observed features are discussed. Theses. (fr).
Author: Dyre Oliver Dammann Publisher: ISBN: Category : Climatology Languages : en Pages : 304
Book Description
Arctic sea ice plays an important role in climate by influencing surface heat fluxes and albedo, so must be accurately represented in climate models. This study finds that the fully coupled ice-ocean-atmosphere-land Community Climate System Model (CCSM3.0) underestimates day-to-day ice variability compared to observations and employs the Community Atmosphere Model (CAM3.0) to investigate the atmospheric sensitivity to sea ice variability. Three 100-ensemble experiments are forced with climatological, daily-varying, and smoothly-varying sea ice conditions from an anomalously low ice period (September 2006-February 2007). Daily ice variability has a large local impact on the atmosphere when ice undergoes rapid changes, leading to local cooling and subsequent circulation changes. The most notable example of a large-scale atmospheric response occurs over Northern Europe during fall where daily ice variability forces reductions in the number and strength of cyclones, leading to positive sea level pressure anomalies, surface warming, and reduced cloud cover.
Author: Steven John Rutherford
Author: Steven John Rutherford
Author: Steven John Rutherford
Author: 
Author: Larry D. Phegley
Author: W. D. Hibler (III.)
Author: J. A. McNitt
Author: 
Author: Karl L. Dinkler
Author: Dyre Oliver Dammann
Author: Patrick Charles Taylor