Albedo and Degree of Puddling of a Melting Cover of Sea Ice

AbstractContinuous measurements of incident and reflected short-wave radiation have been obtained from 12 May to 17 June 1968 on the ice cover at Tanquary Fiord, Ellesmere Island (lat. 81° 25′ N., long. 76° 50′ W.). The observations were made with radiometers suspended between two towers at a height of 50 ft (15 m) to sample an area large enough to be representative of the surface of the ice cover. From the start of surface melting, time-lapse photographs were taken at intervals of 3 h with a camera mounted on one of the towers at a height of 20 ft (6 m) and slanted below the horizontal.Values are presented, for the observation period, of incident short-wave radiation, albedo, air temperature at screen height and percentage of surface covered with melt pools. It is shown that the albedo decreases linearly with increasing area of water puddles.

Download Full-text

Albedo of Melting Sea Ice in the Southern Beaufort Sea

Journal of Glaciology ◽

10.3189/s0022143000013022 ◽

1971 ◽

Vol 10 (58) ◽

pp. 101-104 ◽

Cited By ~ 1

Author(s):

M.P. Langleben

Keyword(s):

Sea Ice ◽

Northwest Territories ◽

Beaufort Sea ◽

Ice Cover ◽

Short Wave ◽

Wave Radiation ◽

Short Wave Radiation ◽

Melting Period ◽

Fast Ice ◽

Made In

AbstractTwo Kipp hemispherical radiometers mounted back to back and suspended by an 18 m cable from a helicopter flying at an altitude of about 90 m were used to make measurements of incident and reflected short-wave radiation. The helicopter was brought to a hovering position at the instant of measurement to ensure that the radiometers were in the proper attitude and a photograph of the ice cover was taken at the same time. The observations were made in 1969 during 16 flights out of Tuktoyaktuk, Northwest Territories (lat. 69° 26’N., long. 133° 02’W.) over the fast ice extending 80 km north of Tuktoyaktuk. Values of albedo of the ice cover were found to decrease during the melting period according to the equation A = 0.59 —0.32P where P is the degree of puddling of the surface.

Download Full-text

Deterioration of Floating Ice Covers

Journal of Energy Resources Technology ◽

10.1115/1.3231173 ◽

1985 ◽

Vol 107 (2) ◽

pp. 177-182 ◽

Cited By ~ 27

Author(s):

G. D. Ashton

Keyword(s):

Surface Albedo ◽

Ice Cover ◽

Short Wave ◽

Wave Radiation ◽

Strength Analysis ◽

Short Wave Radiation ◽

Beam Type ◽

Unsteady Heat Conduction ◽

Original Strength

The deterioration of floating ice covers is analyzed to determine under what conditions the ice cover loses strength due to internal melting. The analysis considers the interaction between sensible heat transfer and long wave radiation loss at the surface, the surface albedo, the short wave radiation penetration and absorption and the unsteady heat conduction within the ice. The thermal analysis then leads to a determination of the porosity of the ice that allows strength analysis to be made using beam-type analyses. The results provide criteria to determine when and how rapidly the ice cover loses strength and under what conditions it will regain the original strength associated with an ice cover of full integrity.

Download Full-text

Albedo of Melting Sea Ice in the Southern Beaufort Sea

Journal of Glaciology ◽

10.1017/s0022143000013022 ◽

1971 ◽

Vol 10 (58) ◽

pp. 101-104 ◽

Cited By ~ 58

Author(s):

M.P. Langleben

Keyword(s):

Sea Ice ◽

Northwest Territories ◽

Beaufort Sea ◽

Ice Cover ◽

Short Wave ◽

Wave Radiation ◽

Short Wave Radiation ◽

Melting Period ◽

Fast Ice ◽

Made In

Two Kipp hemispherical radiometers mounted back to back and suspended by an 18 m cable from a helicopter flying at an altitude of about 90 m were used to make measurements of incident and reflected short-wave radiation. The helicopter was brought to a hovering position at the instant of measurement to ensure that the radiometers were in the proper attitude and a photograph of the ice cover was taken at the same time. The observations were made in 1969 during 16 flights out of Tuktoyaktuk, Northwest Territories (lat. 69° 26’N., long. 133° 02’W.) over the fast ice extending 80 km north of Tuktoyaktuk. Values of albedo of the ice cover were found to decrease during the melting period according to the equationA= 0.59 —0.32PwherePis the degree of puddling of the surface.

Download Full-text

Correcting citizen‐science air temperature measurements across the Netherlands for short wave radiation bias

Meteorological Applications ◽

10.1002/met.1814 ◽

2019 ◽

Vol 27 (1) ◽

Cited By ~ 2

Author(s):

Richard C. Cornes ◽

Marieke Dirksen ◽

Raymond Sluiter

Keyword(s):

The Netherlands ◽

Citizen Science ◽

Air Temperature ◽

Short Wave ◽

Temperature Measurements ◽

Wave Radiation ◽

Short Wave Radiation

Download Full-text

The variability of radiative balance elements and air temperature on the Asian region of Russia

Biogeosciences Discussions ◽

10.5194/bgd-8-4331-2011 ◽

2011 ◽

Vol 8 (3) ◽

pp. 4331-4357

Author(s):

E. V. Kharyutkina ◽

I. I. Ippolitov ◽

S. V. Loginov

Keyword(s):

Global Warming ◽

Air Temperature ◽

Cloud Cover ◽

Temporal Distribution ◽

Short Wave ◽

Reanalysis Data ◽

Wave Radiation ◽

Earth Atmosphere ◽

Short Wave Radiation ◽

Radiative Balance

Abstract. The variability of spatial-temporal distribution of temperature and radiative and heat balances components is investigated for the Asian territory of Russia (45–80° N, 60–180° E) using JRA-25, NCEP/DOE AMIP reanalysis data and observational data for the period of current global warming 1979–2008. It is shown that since the beginning of 90s of XX century the increase of back earth-atmosphere short-wave radiation is observed. Such tendency is in conformity with the cloud cover dynamics and downward short-wave radiation at the surface. Annual averaged radiative balance values at the top are negative; it is consistent with negative annual averaged air temperature, averaged over territory. The downward trend of radiative balance is the most obvious after the beginning of 90s of XX century.

Download Full-text

Excitation of Short-Wave Radiation by Nonrelativistic Oscillators

2007 International Kharkiv Symposium Physics and Engrg. of Millimeter and Sub-Millimeter Waves (MSMW) ◽

10.1109/msmw.2007.4294737 ◽

2007 ◽

Author(s):

A.N. Antonov ◽

V.A. Buts ◽

A.M Egorov ◽

O.F. Kovpik ◽

E.A. Kornilov ◽

...

Keyword(s):

Short Wave ◽

Wave Radiation ◽

Short Wave Radiation

Download Full-text

Evaluating the Effects of Façade Greening on Human Bioclimate in a Complex Urban Environment

Advances in Meteorology ◽

10.1155/2015/747259 ◽

2015 ◽

Vol 2015 ◽

pp. 1-15 ◽

Cited By ~ 43

Author(s):

Britta Jänicke ◽

Fred Meier ◽

Marie-Therese Hoelscher ◽

Dieter Scherer

Keyword(s):

Heat Stress ◽

Short Wave ◽

Wave Radiation ◽

Short Wave Radiation ◽

Long Wave ◽

Building Facades ◽

Urban Heat ◽

The Mean ◽

Human Bioclimate ◽

Radiant Temperature

The evaluation of the effectiveness of countermeasures for a reduction of urban heat stress, such as façade greening, is challenging due to lacking transferability of results from one location to another. Furthermore, complex variables such as the mean radiant temperature(Tmrt)are necessary to assess outdoor human bioclimate. We observedTmrtin front of a building façade in Berlin, Germany, which is half-greened while the other part is bare.Tmrtwas reduced (mean 2 K) in front of the greened compared to the bare façade. To overcome observational shortcomings, we applied the microscale models ENVI-met, RayMan, and SOLWEIG. We evaluated these models based on observations. Our results show thatTmrt(MD = −1.93 K) and downward short-wave radiation (MD = 14.39 W/m2) were sufficiently simulated in contrast to upward short-wave and long-wave radiation. Finally, we compare the simulated reduction ofTmrtwith the observed one in front of the façade greening, showing that the models were not able to simulate the effects of façade greening with the applied settings. Our results reveal that façade greening contributes only slightly to a reduction of heat stress in front of building façades.

Download Full-text