Distribution of Midday Air Temperature and the Solar Irradiance Over Sloping Surfaces under Cloudless Condition

Soo-ock, Kim; Yun, Jin I.

doi:10.5532/kjafm.2013.15.4.291

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The daily maximum temperature estimates to which only the lapse rate correction was applied ('control') were reportedly different from the measured temperatures (Kim and Yun, 2013). Previous studies have concluded that the primary cause of error was the solar radiation effect.…”

Section: Resultsmentioning

confidence: 99%

“…If any grid cell is shaded by a neighboring cell, then that cell does not receive any direct beam radiation, even though the solar altitude is above the horizon for that cell. In this process, the topography of the study area was represented by a 30 m × 30 m digital elevation model (DEM), but areas smoothed to a radius of 750 m (i.e., 25 DEM cells) were used for the slope and aspect calculations following the suggestion by Kim and Yun (2013). The hourly solar irradiance calculated with Eq.…”

Section: A Study Area and Data Acquisitionmentioning

confidence: 99%

“…The effective area in which solar radiation deviation affects the observed temperature was found to be approximately 1.8 km 2 (Kim and Yun, 2013), and this area is quite a bit larger than the 900 m 2 base area of the unit grid cell used to represent the topographical details of terrain. One possible reason why the effective area was so large is that an air parcel heated on a slope in the daytime is quickly replaced by or mixed with the surrounding unheated air parcels.…”

Section: Introductionmentioning

confidence: 98%

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Combined effects of wind and solar irradiance on the spatial variation of midday air temperature over a mountainous terrain

Soo-ock

Kim

et al. 2015

Asia-Pacific J Atmos Sci

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When the midday temperature distribution in a mountainous region was estimated using data from a nearby weather station, the correction of elevation difference based on temperature lapse caused a large error. An empirical approach reflecting the effects of solar irradiance and advection was suggested in order to increase the reliability of the results. The normalized slope irradiance, which was determined by normalizing the solar irradiance difference between a horizontal surface and a sloping surface from 1100 to 1500 LST on a clear day, and the deviation relationship between the horizontal surface and the sloping surface at the 1500 LST temperature on each day were presented as simple empirical formulas. In order to simulate the phenomenon that causes immigrant air parcels to push out or mix with the existing air parcels in order to decrease the solar radiation effects, an advection correction factor was added to exponentially reduce the solar radiation effect with an increase in wind speed. In order to validate this technique, we estimated the 1500 LST air temperatures on 177 clear days in 2012 and 2013 at 10 sites with different slope aspects in a mountainous catchment and compared these values to the actual measured data. The results showed that this technique greatly improved the error bias and the overestimation of the solar radiation effect in comparison with the existing methods. By applying this technique to the Korea Meteorological Administration's 5-km grid data, it was possible to determine the temperature distribution at a 30-m resolution over a mountainous rural area south of Jiri Mountain National Park, Korea.

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Section: Resultsmentioning

confidence: 99%

Section: A Study Area and Data Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Combined effects of wind and solar irradiance on the spatial variation of midday air temperature over a mountainous terrain

Soo-ock

Kim

et al. 2015

Asia-Pacific J Atmos Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this process, the topography of the study area was represented by the 30-m DEM, but areas smoothed to a radius of 750 m (i.e., 25 DEM cells) were used for the slope and aspect calculation following the suggestion of Kim and Yun (2013). Extraterrestrial daily radiation was estimated for the center of the study area (35° 10' 00"N and 127° 43' 00"E) from January 1 to December 31 using the method of Allen et al (1998), and the same value was used regardless of the site location.…”

Section: Validation Of Temperature Estimatesmentioning

confidence: 99%

A Feasibility Study of a Field-specific Weather Service for Small-scale Farms in a Topographically Complex Watershed

Yun

2015

Korean Journal of Agricultural and Forest Meteorology

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An adequate downscaling of synoptic forecasts is a prerequisite for improved agrometeorological service to rural areas in South Korea where complex terrains and small farms are common. In this study, geospatial schemes based on topoclimatology were used to scale down the Korea Meteorological Administration (KMA) temperature forecasts to the local scale (~30 m) across a rural catchment. Then, using these schemes, local temperatures were estimated at 14 validation sites at 0600 and 1500 LST in 2013/2014 and were compared with the observations. The estimation errors were substantially reduced for both 0600 and 1500 LST temperatures when compared against the uncorrected KMA products. The improvement was most notable at low lying locations for the 0600 temperature and at the locations on west-and south-facing slopes for the 1500 LST temperature. Using the downscaled real-time temperature data, a pilot service has started to provide the field-specific weather information tailored to meet the requirements of small-scale farms. For example, the service system makes a daily outlook on the phenology of crop species grown in a given field using the field-specific temperature data. When the temperature forecast is given for next morning, a frost risk index is calculated according to a known relationship of phenology and frost injury. If the calculated index is higher than a pre-defined threshold, a warning is issued and delivered to the grower's cellular phone with relevant countermeasures to help protect crops against frost damage.

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Diversity patterns and phylogenetic structure of vascular plants along elevational gradients in a mountain ecosystem, South Korea

Chun

Lee

2018

J. Mt. Sci.

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Back ground: Biodiversity is the basic units and measures of the health of ecosystems that provide diverse goods and services for the well-being of human societies and other life forms. However, in this era due to the threats from climatic change and other human-driven environmental changes the earth's biodiversity is in a grave danger in the world wide. Here, we explored and mapped how the patterns of plant taxonomic diversity, phylogenetic diversity and structures vary across the geographical regions and with respect to environmental factors in Ethiopia and Eritrea in the horn of Africa by using different analyzing methods and diversity measuring indices for the same reasons.Results: Our analysis showed varied spatial distribution patterns of plant diversity across the region and with the gradients of climatic factors. While the central and southern highland parts of Ethiopia were found to be the primary centers of taxonomic diversity, the centers with higher phylogenetic diversity were found scattered in the

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Distribution of Midday Air Temperature and the Solar Irradiance Over Sloping Surfaces under Cloudless Condition

Cited by 5 publications

References 10 publications

Combined effects of wind and solar irradiance on the spatial variation of midday air temperature over a mountainous terrain

Combined effects of wind and solar irradiance on the spatial variation of midday air temperature over a mountainous terrain

A Feasibility Study of a Field-specific Weather Service for Small-scale Farms in a Topographically Complex Watershed

Diversity patterns and phylogenetic structure of vascular plants along elevational gradients in a mountain ecosystem, South Korea

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