Knowledge Resource Center for Ecological Environment in Arid Area
SURFACE AERODYNAMIC TEMPERATURE MODELING OVER RAINFED COTTON | |
Chavez, J. L.1; Howell, T. A.2; Gowda, P. H.2; Copeland, K. S.2; Prueger, J. H.3 | |
通讯作者 | Chavez, J. L. |
来源期刊 | TRANSACTIONS OF THE ASABE
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ISSN | 2151-0032 |
EISSN | 2151-0040 |
出版年 | 2010 |
卷号 | 53期号:3页码:759-767 |
英文摘要 | Evapotranspiration (ET) or latent heat flux (LE) can be spatially estimated as an energy balance (EB) residual for land surfaces using remote sensing inputs. The EB equation requires the estimation of net radiation (R-n), soil heat flux (G), and sensible heat flux (H). R-n and G can be estimated with an acceptable accuracy. In computing H, radiometric surface temperature (T-s) is often used instead of surface aerodynamic temperature (T-o), as T-o is neither measured nor easily estimated. This may cause an underestimation of ET because H will be overestimated as T-s is typically larger than T-o for unstable atmospheric conditions. The objectives of this study were to (1) model T-o to improve the estimation of H and consequently ET for advective environments in the semi-arid Texas High Plains, and (2) assess the accuracy of the T-o model using three different methods (aerodynamic profile, lysimeter, and eddy covariance). A 6.5 m tower platform was used to measure profiles of wind speed, air temperature, and relative humidity in and above cotton canopy near a large weighing lysimeter managed under rainfed conditions at the USDA-ARS Conservation and Production Research Laboratory, Bushland, Texas. The T-o was modeled using H as a residual from the EB at the lysimeter location. Results indicated that T-o was better modeled as a linear function of T-s, air temperature, and surface aerodynamic resistance. Modeled T-o showed a very small estimation error (0.1% mean bias error and 3.8% root mean square error) when compared to T-o values measured using the aerodynamic profile data. Even though excellent results were found in this study, the model is only valid for dryland cotton with a leaf area index ranging from 0.2 to 1.3 m(2) m(-2). Furthermore, more research is needed to expand the T-o model to cover cotton grown under irrigated conditions and showing larger crop percent cover and leaf area index values, and under different environmental and atmospheric conditions. |
英文关键词 | Air temperature Evapotranspiration Radiometric surface temperature Sensible heat flux |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000280272500011 |
WOS关键词 | WATER-VAPOR TRANSFER ; SENSIBLE HEAT-FLUX ; ENERGY-BALANCE ; RADIOMETRIC TEMPERATURE ; EVAPOTRANSPIRATION ; PERFORMANCE ; CANOPY ; LAYER ; DIFFERENCE ; MANAGEMENT |
WOS类目 | Agricultural Engineering |
WOS研究方向 | Agriculture |
来源机构 | Colorado State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/166553 |
作者单位 | 1.Colorado State Univ, Dept Civil & Environm Engn, Ft Collins, CO 80523 USA; 2.USDA ARS, Conservat & Prod Res Lab, Soil & Water Management Res Unit, Bushland, TX 79012 USA; 3.USDA ARS, Natl Soil Tilth Lab, Soil Water & Air Resources Res Unit, Ames, IA 50011 USA |
推荐引用方式 GB/T 7714 | Chavez, J. L.,Howell, T. A.,Gowda, P. H.,et al. SURFACE AERODYNAMIC TEMPERATURE MODELING OVER RAINFED COTTON[J]. Colorado State University,2010,53(3):759-767. |
APA | Chavez, J. L.,Howell, T. A.,Gowda, P. H.,Copeland, K. S.,&Prueger, J. H..(2010).SURFACE AERODYNAMIC TEMPERATURE MODELING OVER RAINFED COTTON.TRANSACTIONS OF THE ASABE,53(3),759-767. |
MLA | Chavez, J. L.,et al."SURFACE AERODYNAMIC TEMPERATURE MODELING OVER RAINFED COTTON".TRANSACTIONS OF THE ASABE 53.3(2010):759-767. |
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