A note on the use of radiosonde data to estimate the daytime fluxes of sensible and latent heat: a comparison with surface flux measurements from the FIFE

Diak, George R.; Whipple, Mark S.

doi:10.1016/0168-1923(94)90069-8

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…The atmospheric boundary layer responds to surface forcings at regional scales. Radiosondebased budgets provide a framework for evaluating surface fluxes at regional scales [Diak and Whipple, 1994 …”

Section: Introductionmentioning

confidence: 99%

Comparison of regional surface fluxes from boundary‐layer budgets and aircraft measurements above boreal forest

Barr¹,

Betts²,

Desjardins³

et al. 1997

J. Geophys. Res.

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Abstract. Daytime surface sensible and latent heat fluxes (H s and ;•Es) above boreal forest, derived independently from the boundary-layer budgets of heat and water vapor and by eddy correlation from the Twin Otter aircraft, are compared. The aircraft and boundary-layer budget values of Hs + ;•Es underestimated surface available energy by 25% and 4%, respectively, when the sum of the minor surface energy balance terms (storage and photosynthesis) was estimated as 17% of net radiation. The boundary-layer budget estimate of the regional Bowen ratio (1.05) agreed to within 15% of the aircraft measurement (0.91). Both methods clearly have value for estimating land-surface fluxes at a regional scale. IntroductionRegional estimates of land surface fluxes are needed to characterize the land-atmosphere interaction and to improve the diurnal and seasonal boundary-layer cycles in large-scale atmospheric models. The atmospheric boundary layer responds to surface forcings at regional scales. Radiosonde- where H x is the surface sensible heat flux density, XE x is the surface latent heat flux density, and S is the sum of the minor 29,213

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Section: Introductionmentioning

confidence: 99%

Comparison of regional surface fluxes from boundary‐layer budgets and aircraft measurements above boreal forest

Barr¹,

Betts²,

Desjardins³

et al. 1997

J. Geophys. Res.

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“…Comparisons of derived fluxes made by Diak and Whipple (1994) with those measured from a network of surface stations during the First International Satellite Land-Surface Climatology Project (ISLSCP) Field Experiment (FIFE) indicated standard errors of estimation of 1.2 and 1.5MJm~2, respectively, for the 12-h sensible heating and evapotranspiration totals. (A typical combined sensible and latent heating total for a clear summer day in mid-latitudes is about 15MJm~2).…”

Section: Surface Energy Budget Estimatormentioning

confidence: 99%

“…This procedure is an extension of the methods described in Diak andWhipple (1994, 1995). In Diak and Whipple (1994), surface sensible and latent heat fluxes were estimated from rawinsonde measurements of the daytime growth of the planetary boundary layer with the aid of a surface layermixed layer model. The method was implemented using rawinsonde data at 12 and 00 UTC.…”

Section: Surface Energy Budget Estimatormentioning

confidence: 99%

Relating remotely‐sensed vegetation and soil moisture indices to surface energy fluxes in vicinity of an atmospheric dryline

Rabin

Burns

Collimore

et al. 2000

Remote Sensing Reviews

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A physical-statistical method for optimal estimation of daily surface heat flux and Bowen ratio on the mesoscale is applied to a portion of the US southern Great Plains, where a strong surface/atmosphere moisture gradient (dryline) was present. The method, previously tested over the central US, is based on observations of daytime planetary boundary layer (PBL) growth from the operational rawinsonde network and diurnal land-surface temperature amplitude measured from geostationary (GOES) satellite. The mesoscale patterns of these heat fluxes are compared with an AVHRR based vegetation index and a surface-based antecedent precipitation index. The derived heat flux is found to decrease by nearly an order of magnitude with the transition from prairie to forest eastward across Oklahoma. A subtle maximum in heat flux in the Texas panhandle is observed upwind of an eastward bulge in the dryline where enhanced downward mixing of dry air was occurring. Relationships for surface heat flux are formulated in terms of the vegetation and antecedent precipitation indices using: (1) a simple polynomial, and (2) a physical approach where soil moisture and partitioning of fluxes between bare soil and canopy are considered. 53 Downloaded by [University of Tennessee, Knoxville] at 21:45 07 June 2016 54 R.M. RABIN et al.

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“…In Diak and Whipple (1993c), we were able to use collocated radiosonde measurements and surface flux measurements at the FIFE site to make more detailed estimates of how well surface sensible heating and evapotranspiration can be estimated using radiosonde evaluations of DH. This comparison gave RMS accuracies of 1.2 and 1.5 MJ-m~2, respectively, for the 12-hour sensible heating and evapotranspiration totals, which was a better result than the initial error projections.…”

Section: E Temporal Changes Of the Height Of The Planetary Boundary mentioning

confidence: 99%

“…The daytime change in time of the height of the PBL (DH), to date measured from radiosonde reports, is a sensitive indicator of the surface sensible heating which we have used in Diak (1990), Diak and Whipple (1993b) and Diak and Whipple (1993c) to quantify the surface sensible heating and evapotranspiration. This sensitivity of DH to the surface energy balance is evident in the equations describing the change of the PBL height with time (Driedonks, 1982a) and has been well-documented in both theoretical (Driedonks, 1982b) and applied studies (Chou and Atlas, 1982;Diak and Stewart, 1989;Boers andEloranta, 1984, Culf, 1993).…”

Section: E Temporal Changes Of the Height Of The Planetary Boundary mentioning

confidence: 99%

Regional‐scale comparisons of vegetation and soil wetness with surface energy budget properties from satellite and in‐situ observations

Diak

Rabin

Gallo

et al. 1995

Remote Sensing Reviews

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This study focuses on relationships between vegetation cover, soil moisture, precipitation and evapotranspiration for the Midwest and Great Plains region of the central United States in early June 1988, the year of the Midwest drought. The data base consists of: (1) microwave estimates of soil moisture made using data from the Special Sensor Microwave/Imager (SSM/I); (2) Normalized Difference Vegetation Index (NDVI) estimates made using data from the Advanced Very High Resolution Radiometer (AVHRR); (3) surface-based Antecedent Precipitation Index (API) estimates made using precipitation records from surface reporting stations and; (4) estimates of sensible heating, evapotranspiration and an "effective" surface roughness made for the region using a combination of satellitemeasured surface "skin" temperatures from geostationary (GOES) satellites and radiosonde measurements of the time-changes of the height of the planetary boundary layer (DH) from the synoptic network. The scatter diagram of the daytime range (time-change) of surface skin temperature (DT S ) versus NDVI over the large region investigated shows a similar pattern to published results for 355 Downloaded by [Cambridge University Library] at 03:15 06 April 2015 356 G. R. DIAK ET AL.absolute skin temperature measurements versus NDVI over smaller areas (generally the size of a single watershed). Over the entire region investigated, the correlation between DT S and NDVI was poor. In the eastern section of the region, however, which was experiencing drought conditions by June 1988 (evidenced in very low API values), the correlation between DT S and NDVI was much improved. In the western section of the investigation region, with generally higher values of API (suggesting higher soil moisture content), there was a good correlation of DT S with API for areas with low NDVI. Values of a microwave-based API derived from SSM/I data generally showed similar relationships to DT S values as the surface-based API, but with slightly higher correlation coefficients. Values of the surface Bowen ratio derived from DT S and DH measurements were in qualitative agreement with the pattern of the developing drought conditions in the area, although quantitative comparisons with other the other components of the data base were less definitive. Values of an "effective" surface roughness derived from the same DT S and DH measurements showed a good correlation to NDVI.

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A note on the use of radiosonde data to estimate the daytime fluxes of sensible and latent heat: a comparison with surface flux measurements from the FIFE

Cited by 10 publications

References 7 publications

Comparison of regional surface fluxes from boundary‐layer budgets and aircraft measurements above boreal forest

Comparison of regional surface fluxes from boundary‐layer budgets and aircraft measurements above boreal forest

Relating remotely‐sensed vegetation and soil moisture indices to surface energy fluxes in vicinity of an atmospheric dryline

Regional‐scale comparisons of vegetation and soil wetness with surface energy budget properties from satellite and in‐situ observations

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