scholarly journals APPLICATION OF BUSINGER-DYEAR AND BRUTSAERT'S STABILITY FUNCTIONS FOR ESTIMATION OF THE SENSIBLE HEAT FLUX ON SOME MEASURED DATA IN THE HADA AL-SHAM AREA, MAKKAH, SAUDI ARABIA

2013 ◽  
Vol 24 (1) ◽  
pp. 1-16
Author(s):  
O.M.Y. ANBAR
Keyword(s):  
Heat Flux ◽  
Saudi Arabia ◽  
Sensible Heat Flux ◽  
Measured Data ◽  
Sensible Heat ◽  
Stability Functions

scholarly journals Sensible Heat Flux by Surface Layer Scintillometry and Eddy Covariance over a Mixed Grassland Community as Affected by Bowen Ratio and MOST Formulations for Unstable Conditions

2009 ◽  
Vol 10 (2) ◽  
pp. 479-492 ◽  
Author(s):  
G. O. Odhiambo ◽  
M. J. Savage
Keyword(s):  
Heat Flux ◽  
Surface Layer ◽  
Eddy Covariance ◽  
Heat Flux Density ◽  
Sensible Heat Flux ◽  
Bowen Ratio ◽  
Sensible Heat ◽  
Grassland Community ◽  
Stability Functions ◽  
Wide Range

Abstract Measurements of sensible heat flux for an extended period for unstable conditions using surface layer scintillometry (SLS) and eddy covariance (EC) and supplemented by Bowen ratio measurements for a mixed grassland community on the eastern seaboard of South Africa are presented. Measurements of SLS sensible heat flux density were compared with those obtained using EC for a wide range of Bowen ratio (β). Also presented is an analysis of the different forms of the Monin–Obukhov similarity theory (MOST) functions used in micrometeorology and suggested by various authors, done by comparing EC sensible heat and measured by SLS through the use of an iterative determination of Monin–Obukhov parameters. A comparison of the SLS-measured structure parameter of air temperature CT2 corrected for β and uncorrected was carried out, with the results showing good correspondence but with a slight bias indicating that not correcting SLS measurements of CT2 for β would also result in a slight bias in H. Eddy covariance estimates of sensible heat flux density (HEC), obtained using averaging periods between 1 and 120 min and compared with scintillometer measurements, demonstrated that short-time averaging periods resulted in underestimated HEC. The EC measurements for 60- and 120-min averaging periods were sometimes inconsistent with SLS measurements. A sensitivity analysis indicates that both the EC and SLS measurements of H are influenced by β. For 0 < β < 0.2, the correction to HSLS amounts to more than 10% compared to more than 20% for HEC, although the magnitude of the differences are small. A comparison of HEC and HSLS measurements for 0.1 intervals of β between 0 and 4.3 shows reasonable correspondence for β > 1. For 0 < β < 1, the HSLS (y) versus HEC (x) scatterplot linear regression slope decreased from 1.25 to close to 1 for β increasing from 0 to 1. A comparison between β-corrected HEC and HSLS measurements—the latter computed using various empirical stability functions used by MOST—shows significant differences compared to HEC ranging from almost 20% overestimation for some methods to 20% underestimation for others. Long-term use of the recommended MOST stability functions for the SLS method is shown to result in reasonable correspondence between SLS and EC sensible heat flux for a wide range in atmospheric conditions, stability, and sensible heat magnitude.

scholarly journals Response of the Energy Balance on the Margin of the Greenland Ice Sheet to Temperature Changes

1990 ◽  
Vol 36 (123) ◽  
pp. 217-221 ◽  
Author(s):  
Roger J. Braithwaite ◽  
Ole B. Olesen
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Air Temperature ◽  
Sensible Heat Flux ◽  
Ice Sheet ◽  
Temperature Response ◽  
Greenland Ice Sheet ◽  
Energy Balance Model ◽  
Balance Model ◽  
Sensible Heat

AbstractDaily ice ablation on two outlet glaciers from the Greenland ice sheet, Nordbogletscher (1979–83) and Qamanârssûp sermia (1980–86), is related to air temperature by a linear regression equation. Analysis of this ablation-temperature equation with the help of a simple energy-balance model shows that sensible-heat flux has the greatest temperature response and accounts for about one-half of the temperature response of ablation. Net radiation accounts for about one-quarter of the temperature response of ablation, and latent-heat flux and errors account for the remainder. The temperature response of sensible-heat flux at QQamanârssûp sermia is greater than at Nordbogletscher mainly due to higher average wind speeds. The association of high winds with high temperatures during Föhn events further increases sensible-heat flux. The energy-balance model shows that ablation from a snow surface is only about half that from an ice surface at the same air temperature.

Components of the energy balance of the ground surface and their effect on the thermics of the substrata of the vegetation oasis at Henryk Arctowski Station, King George Island, South Shetland Islands

Polar Record ◽  
2000 ◽  
Vol 36 (196) ◽  
pp. 3-18 ◽  
Author(s):  
P. Prosek ◽  
M. Janouch ◽  
K. Láska
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Soil Temperature ◽  
Sensible Heat Flux ◽  
Ground Surface ◽  
South Shetland Islands ◽  
Radiation Balance ◽  
Sensible Heat ◽  
King George Island ◽  
Shetland Islands

AbstractThis article presents the results of measurements of the components of ground-surface energy balance (radiation balance, sensible heat flux, latent heat flux, and ground heat flux) taken during the 1994/95 summer season at Poland's Henryk Arctowski Station, King George Island, South Shetland Islands (62°09'42”S, 58°28'10”W). This was the first time that these complex measurements had been taken in the central part of the South Shetlands archipelago. The results are evaluated at the level of daily and seasonal fluctuations. The consequences of energy balance on the temperature conditions of the soil substrata are highlighted. The verification of the degree of influence of a subset of energy-balance components on soil temperature allowed analysis of the relationships among soil temperature, radiation balance, and sensible heat flux. This analysis leads to the conclusion that there is a rapid reaction of the soil temperature to the radiation balance and sensible heat flux to a depth of 5 cm. The boundary atmosphere and soil substrate represent the basic components of the ecotops of the Antarctic vegetation oasis, so these results are interpreted in pedological or botanical studies in the search for environmental influences on the vegetation.

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