125 research outputs found
Summary of Research 1998, Department of Oceangraphy
The views expressed in this report are those of the authors and do not reflect the official policy or position of the Department of Defense or the U.S.
Government.This report contains summaries of research projects in the Department of Oceanography. A list of recent publications is also included
which consists of conference presentations and publications, books, contributions to books, published journal papers, technical reports,
and thesis abstracts
Comparison of sea-ice freeboard distributions from aircraft data and cryosat-2
The only remote sensing technique capable of obtain- ing sea-ice thickness on basin-scale are satellite altime- ter missions, such as the 2010 launched CryoSat-2. It is equipped with a Ku-Band radar altimeter, which mea- sures the height of the ice surface above the sea level. This method requires highly accurate range measure- ments. During the CryoSat Validation Experiment (Cry- oVEx) 2011 in the Lincoln Sea, Cryosat-2 underpasses were accomplished with two aircraft, which carried an airborne laser-scanner, a radar altimeter and an electro- magnetic induction device for direct sea-ice thickness re- trieval. Both aircraft flew in close formation at the same time of a CryoSat-2 overpass. This is a study about the comparison of the sea-ice freeboard and thickness dis- tribution of airborne validation and CryoSat-2 measure- ments within the multi-year sea-ice region of the Lincoln Sea in spring, with respect to the penetration of the Ku- Band signal into the snow
Surface currents in operational oceanography: Key applications, mechanisms, and methods
This paper reviews physical mechanisms, observation techniques and modelling approaches
dealing with surface currents on short time scales (hours to days) relevant for operational
oceanography. Key motivations for this article include fundamental difficulties in reliable
measurements and the persistent lack of a widely held consensus on the definition of surface
currents. These problems are augmented by the fact that various methods to observe and
model ocean currents yield very different representations of a surface current. We distinguish
between four applicable definitions for surface currents; (i) the interfacial surface current, (ii) the
direct wind-driven surface current, (iii) the surface boundary layer current, and (iv) an effective
drift current. Finally, we discuss challenges in synthesising various data sources of surface
currents - i.e. observational and modelling – and take a view on the predictability of surface
currents concluding with arguments that parts of the surface circulation exhibit predictability
useful in an operational context
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