Sea-Ice Thickness Measurement:
نویسندگان
چکیده
Helicopter-borne electromagnetic (HEM) induction systems provide a means to measure sea ice thickness along flight paths covering a large area in a short period of time, and make the data available in real-time for incorporation into operational ice charts. Ice surface elevation profiles are also collected with a laser altimeter contained in the system. With the introduction of the fix-mounted HEM system, the logistics of collecting the data is greatly simplified, the footprint size is reduced, and more accurate measurements of level ice thickness can be obtained as spot samples. Recent experiments in the Canadian Arctic, Labrador Shelf region and Gulf of St. Lawrence have demonstrated that HEM ice thickness and surface elevation data are also valuable for validating algorithms for ice type identification in SAR (synthetic aperture radar) imagery. HEM systems will continue to be used to validate new SAR products such as dualpolarisation imagery now available from ENVISAT, and quad-polarisation imagery planned with the launch of RADARSAT-2.
منابع مشابه
Sea Ice Thickness Measurement from an Ice Breaker Using a Stereo Imaging System Consisted of a Pairs of High Definition Video Cameras
Sea ice monitoring is quite important from the global warming point of view. Sea ice thickness is one of the most important parameters for understanding the heat flux of sea ice area. Usually, sea ice thickness is measured by drilling a hole on the sea ice. However, this work does take a lot of time. In order to effectively measure sea ice thickness from an icebreaker deck, in 2000, the authors...
متن کاملShip-based Sea Ice Observations in Lützow-holm Bay, East Antarctica
The authors conducted the extensive ship-based sea ice observations from December 2000 to February 2001 in Lützow-Holm Bay, Antarctica. The authors focused on the observations of sea ice thickness in the land fast ice, which provides fundamental information on the unique growth and decay process of the sea ice in this area. The thickness of ice plus snow was measured using a portable Electro-Ma...
متن کاملThe Development of Sea Ice Thickness Measurement Sensor
This paper reports on the development of an acoustic sea ice thickness measurement sensor. The development is applying acoustic NonDestructive-Testing (NDT) techniques to test first year sea ice including significant amounts of enclosed air bubbles. Two single piezoelectric transducers are tightly placed on smoothed sea ice surface to emit and receive acoustic signals. Besides seeing a detectab...
متن کاملA Study of an Inversion Model for Sea Ice Thickness Retrieval in Ross Island, Antarctica
In this study, an inverse microwave scattering model for sea ice has been developed for the purpose of sea ice thickness retrieval using radar backscatter data. The model is loosely based on the Radiative-Transfer-Thermodynamic Inverse Model for Sea Ice Thickness Retrieval from Time-Series Scattering Data. The developed inverse model is a combination of the Radiative Transfer Theory with Dense ...
متن کاملAn Inverse Model for Sea Ice Thickness Retrieval Using Active Microwave Remote Sensing
Sea ice encompasses a large area within the polar region and greatly influences the earth’s climate system. One particular sea ice parameter of interest in understanding the dynamics of the sea ice cover and the heat exchange between the ocean and the atmosphere is its thickness. Due to this, there has been an increase in interest towards research in the polar region. Yet the harsh environment ...
متن کاملSea-ice thickness measurement based on the dispersion of ice swell.
The dispersion of flexural waves propagating in the Arctic sea ice cover is exploited in order to locally measure the ice thickness. The observed dispersion, for waves filtered in the 4-20 s period interval, at up to 4 broad-band seismometers deployed in Spring 2007 near the North Pole, is compared to a parameterized model that accounts for a complex wavefield made of a superposition of indepen...
متن کامل