Satellite doppler determination of differential sea ice motion in the vicinity of the North Pole

1983 ◽  
Author(s):  
J Popelar ◽  
J Kouba
Keyword(s):  
Sea Ice ◽  
North Pole ◽  
The North

Aerial observations of sea ice and melt ponds near the North Pole during CHINARE2010

2017 ◽  
Vol 36 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Lanyu Li ◽  
Changqing Ke ◽  
Hongjie Xie ◽  
Ruibo Lei ◽  
Anqi Tao
Keyword(s):  
Sea Ice ◽  
North Pole ◽  
The North ◽  
Melt Ponds

scholarly journals Interpretation of Slar Imagery of Sea Ice in Nares Strait and the Arctic Ocean

1975 ◽  
Vol 15 (73) ◽  
pp. 193-213
Author(s):  
Moira Dunbar
Keyword(s):  
Sea Ice ◽  
Arctic Ocean ◽  
North Pole ◽  
The Arctic ◽  
Canadian Forces ◽  
Nares Strait ◽  
The North ◽  
The Arctic Ocean ◽  
Ice Edge ◽  
Airborne Sensors

AbstractSLAR imagery of Nares Strait was obtained on three flights carried out in. January, March, and August of 1973 by Canadian Forces Maritime Proving and Evaluation Unit in an Argus aircraft equipped with a Motorola APS-94D SLAR; the March flight also covered two lines in the Arctic Ocean, from Alert 10 the North Pole and from the Pole down the long. 4ºE. meridian to the ice edge at about lat. 80º N. No observations on the ground were possible, but -some back-up was available on all flights from visual observations recorded in the air, and on the March flight from infrared line-scan and vertical photography.The interpretation of ice features from the SLAR imagery is discussed, and the conclusion reached that in spite of certain ambiguities the technique has great potential which will increase with improving resolution, Extent of coverage per distance flown and independence of light and cloud conditions make it unique among airborne sensors.

scholarly journals Errata

Polar Record ◽  
1971 ◽  
Vol 15 (98) ◽  
pp. 760-760
Keyword(s):  
Body Temperature ◽  
Circadian Rhythms ◽  
Sea Ice ◽  
North Pole ◽  
Electrolyte Excretion ◽  
Protein Requirement ◽  
Full Account ◽  
Scientific Investigations ◽  
The North ◽  
Pack Ice

Polar Record, Vol 14, No 93, 1969H. Simpson's expedition to the North Pole, 1969Page 820, line 5 For 400 km which took twenty three days read 640 kmwhich took 32 days.Page 820, line 15 For all three read Tufft.Page 820, line 21 For lat 80°50N read lat 84° 42'N.The party turned back on 27 March and reached Ward Hut Island on 6 April after 45 days on the sea ice. Dr Simpson adds: The scientific investigations into whether human circadian rhythms (body temperature, hormone and electrolyte excretion) desynchronize from the 24-h period on the polar pack ice and also a study of the minimum protein requirement in polar rations on a manhauling expedition, will be published in 1971. A full account of the expedition with tabulations of distances, weather etc appears in Due North by Myrtle Simpson (London, Gollancz, 1969).Polar Record, Vol 15, No 97, 1969Page 579, line 56 For melting read freezing.

scholarly journals Interpretation of Slar Imagery of Sea Ice in Nares Strait and the Arctic Ocean

1975 ◽  
Vol 15 (73) ◽  
pp. 193-213 ◽  
Author(s):  
Moira Dunbar
Keyword(s):  
Sea Ice ◽  
Arctic Ocean ◽  
North Pole ◽  
The Arctic ◽  
Canadian Forces ◽  
Nares Strait ◽  
The North ◽  
The Arctic Ocean ◽  
Ice Edge ◽  
Airborne Sensors

Abstract SLAR imagery of Nares Strait was obtained on three flights carried out in. January, March, and August of 1973 by Canadian Forces Maritime Proving and Evaluation Unit in an Argus aircraft equipped with a Motorola APS-94D SLAR; the March flight also covered two lines in the Arctic Ocean, from Alert 10 the North Pole and from the Pole down the long. 4ºE. meridian to the ice edge at about lat. 80º N. No observations on the ground were possible, but -some back-up was available on all flights from visual observations recorded in the air, and on the March flight from infrared line-scan and vertical photography. The interpretation of ice features from the SLAR imagery is discussed, and the conclusion reached that in spite of certain ambiguities the technique has great potential which will increase with improving resolution, Extent of coverage per distance flown and independence of light and cloud conditions make it unique among airborne sensors.

scholarly journals First results of the Sea-Ice Model Intercomparison Project (SIMIP)

1997 ◽  
Vol 25 ◽  
pp. 8-11 ◽  
Author(s):  
Martin Kreyscher ◽  
Markus Harder ◽  
Peter Lemke
Keyword(s):  
Sea Ice ◽  
Fluid Model ◽  
North Pole ◽  
The Arctic ◽  
Fram Strait ◽  
Model Intercomparison ◽  
The North ◽  
Intercomparison Project ◽  
Cavitating Fluid ◽  
Ice Model

The Sea-Ice Model Intercomparison Project (SIMIP) is part of the activities of the Sea Ice-Ocean Modeling Panel (SIOM) of the Arctic Climate System Study (WMO) (ACSYS) that aims to determine the optimal sea-ice model for climate simulations. This investigation is focused on the dynamics of sea ice. A hierarchy of four sea-ice rheologies is applied, including a viscous-plastic rheology, a cavitating-fluid model, a compressible Newtonian fluid, and a simple scheme with a step-function stoppage for ice drift.For comparison, the same grid, land boundaries and forcing fields are applied to all models. Atmospheric forcing for a 7 year period is obtained from the European Centre for Medium-Range Weather Forecasts (UK) (ECMWF analyses), while occanic forcing consists of annual mean geostrophic currents and heal fluxes into a fixed mixed layer. Daily buoy-drift data monitored by the International Arctic Buoy Program (IABP) and ice thicknesses at the North Pole from submarine upward-looking sonar are available as verification data. The daily drift statistics for separate regions and seasons contribute to an error function showing significant differences between the models. Additionally, Fram Strait ice exports predicted by the different models are investigated. The ice export of the viscous-plastic model amounts to 0.11 Sv. when it is optimized to the mean daily buoy velocities and the observed North Pole ice thicknesses. The cavitating-fluid model yields a very similar Fram Strait outflow, but underestimates the North Pole ice thickness. The two other dynamic schemes predict unrealistically large ice thicknesses in the central Arctic region, while Fram Strait ice exports are too low.

scholarly journals Reaktualisasi Pengukuran Arah Kiblat Dengan Metode Segitiga Bola Pada Masjid Dan Musholla

2021 ◽  
Vol 1 (2) ◽  
pp. 85-100
Author(s):  
ANDI SUSANTO ◽  
Diana Nurfadilah ◽  
Siti Zaenab
Keyword(s):  
North Pole ◽  
Spherical Triangle ◽  
Legal Requirements ◽  
Know How ◽  
Direction Angle ◽  
The North ◽  
Triangle Method ◽  
The Difference ◽  
Makkah City

An understanding of the Qibla direction is very important for Muslims, because facing the Qibla is one of the legal requirements for performing prayers. Although now the technology to determine the Qibla direction is sophisticated, it is necessary to know how to determine the actual Qibla direction. The determination of the direction of the Qibla with the spherical triangle method is based on a triangle on the surface of the globe which is formed by three large circles of the globe, namely two circles of the earth's longitude and one circle of Qibla. The intersection of the three large circles forms three points, namely point A (Makkah), point B (the location where the Qibla direction will be calculated), and point C (the North Pole). The steps in determining the Qibla direction include: (1) Prepare the data needed in calculating the Qibla direction of a place, namely latitude and longitude data for the Kaaba (Makkah city), as well as latitude and longitude data for the location/city to be calculated. the qibla direction; (2) Calculation of the Qibla direction using the formula , with: B = Angle of the direction of the Qibla of a place, C = The difference between the longitude of the Kaaba and the longitude of the place where the Qibla direction is being sought, a = 90o – tp (latitude), and b = 90o – ka (Kaaba latitude); (3) Calculation of true Qibla azimuth from true north in a clockwise direction, where true Qibla azimuth = 360o – Qibla direction angle (B); (4) Determination of the actual Qibla direction by measuring using an arc ruler as large as true Qibla azimuth from true north.

scholarly journals XV. On the errors in longitude as determined by chronometers at sea, arising from the action of the iron in the ships upon the chronometers

1820 ◽  
Vol 110 ◽  
pp. 196-208 ◽  
Keyword(s):  
Accurate Determination ◽  
North Pole ◽  
Foreign Service ◽  
The North

The determination of the longitude at sea by timekeepers, is so exceedingly easy from the simplicity of the observations and calculations employed, and from the general practica­bility of the method, as to render chronometers, in the present improved state of navigation, almost indispensable articles in the equipment of ships for foreign service ; and I shall feel happy if the following observations may, in any way, con­tribute to the more accurate determination of the longitude by this method. The sudden alteration in the rates of chronometers when taken on board of ships, has been frequently observed by intelligent seamen ; and is generally ascribed to the motion of the vessels. Before, however, I attempt to account for this alteration, I shall first prove that it actually takes place ; and, in order to do this, shall relate the circumstances con­nected with the chronometers on board the Dorothea and Trent, commanded by Captain Buchan, which occurred du­ring the late voyage to the North Pole.

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