Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales
Based on the flux observation, adjacent automatic meteorological observation and ERA5-Land reanalysis data for rainstorm cases in Western Chongqing, the reliability and applicability of flux observation over mountain areas in Chongqing are discussed. Additionally, the variation characteristics of fl...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Torrential Rain and Disasters
2021-04-01
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| Series: | 暴雨灾害 |
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| Online Access: | http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2021.02.013 |
| _version_ | 1827907527672594432 |
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| author | Qin DU Yanghua GAO Jing HUANG Song GAO |
| author_facet | Qin DU Yanghua GAO Jing HUANG Song GAO |
| author_sort | Qin DU |
| collection | DOAJ |
| description | Based on the flux observation, adjacent automatic meteorological observation and ERA5-Land reanalysis data for rainstorm cases in Western Chongqing, the reliability and applicability of flux observation over mountain areas in Chongqing are discussed. Additionally, the variation characteristics of fluxes in different time scales in 2019 are analyzed. The results are as follows. (1) Flux stations have similar meteorological background with the adjacent meteorological stations, and flux observations can better represent the temporal evolution of surface sensible heat and latent heat fluxes during precipitation than ERA5-land reanalysis data, indicating that the flux observations are reliable. The precipitation at flux stations can be replaced by the average precipitation at neighboring stations. (2) The three fluxes and their increments have different correlations with temperature, relative humidity, wind speed and precipitation. Momentum flux is positively correlated with precipitation and wind speed. The sensible and latent heat fluxes are positively correlated with temperature and wind speed, and negatively correlated with relative humidity. The increment of latent and sensible heat fluxes at Caoshang is negatively correlated with local precipitation. All these characteristics indicate that flux observations can be used in the study of this rainstorm. (3) The seasonal and monthly variations of sensible heat flux and latent heat flux indicate that the ground surface is mainly characterized by heating and evaporation in the long-term time scale. The seasonal variation of momentum flux indicates that the turbulent motion is the strongest in spring and the weakest in autumn. The diurnal variation of momentum flux is mainly unimodal, which indicates that the turbulence activity is stronger in the daytime and weaker at night. The diurnal variation of momentum flux at Jinfoshan shows a bimodal pattern in spring, summer and autumn, which indicates that the turbulence activity increases at night. |
| first_indexed | 2024-03-13T01:09:28Z |
| format | Article |
| id | doaj.art-27e29d4d6ad34cd4955a45468f31aece |
| institution | Directory Open Access Journal |
| issn | 2097-2164 |
| language | zho |
| last_indexed | 2024-03-13T01:09:28Z |
| publishDate | 2021-04-01 |
| publisher | Editorial Office of Torrential Rain and Disasters |
| record_format | Article |
| series | 暴雨灾害 |
| spelling | doaj.art-27e29d4d6ad34cd4955a45468f31aece2023-07-06T04:31:26ZzhoEditorial Office of Torrential Rain and Disasters暴雨灾害2097-21642021-04-0140220821510.3969/j.issn.1004-9045.2021.02.0132739Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scalesQin DU0Yanghua GAO1Jing HUANG2Song GAO3Chongqing Institute of Meteorological Sciences, Chongqing 401147Chongqing Institute of Meteorological Sciences, Chongqing 401147Southwest University, Chongqing 400715Chongqing Institute of Meteorological Sciences, Chongqing 401147Based on the flux observation, adjacent automatic meteorological observation and ERA5-Land reanalysis data for rainstorm cases in Western Chongqing, the reliability and applicability of flux observation over mountain areas in Chongqing are discussed. Additionally, the variation characteristics of fluxes in different time scales in 2019 are analyzed. The results are as follows. (1) Flux stations have similar meteorological background with the adjacent meteorological stations, and flux observations can better represent the temporal evolution of surface sensible heat and latent heat fluxes during precipitation than ERA5-land reanalysis data, indicating that the flux observations are reliable. The precipitation at flux stations can be replaced by the average precipitation at neighboring stations. (2) The three fluxes and their increments have different correlations with temperature, relative humidity, wind speed and precipitation. Momentum flux is positively correlated with precipitation and wind speed. The sensible and latent heat fluxes are positively correlated with temperature and wind speed, and negatively correlated with relative humidity. The increment of latent and sensible heat fluxes at Caoshang is negatively correlated with local precipitation. All these characteristics indicate that flux observations can be used in the study of this rainstorm. (3) The seasonal and monthly variations of sensible heat flux and latent heat flux indicate that the ground surface is mainly characterized by heating and evaporation in the long-term time scale. The seasonal variation of momentum flux indicates that the turbulent motion is the strongest in spring and the weakest in autumn. The diurnal variation of momentum flux is mainly unimodal, which indicates that the turbulence activity is stronger in the daytime and weaker at night. The diurnal variation of momentum flux at Jinfoshan shows a bimodal pattern in spring, summer and autumn, which indicates that the turbulence activity increases at night.http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2021.02.013momentum fluxlaten heat fluxsensible heat flux |
| spellingShingle | Qin DU Yanghua GAO Jing HUANG Song GAO Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales 暴雨灾害 momentum flux laten heat flux sensible heat flux |
| title | Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales |
| title_full | Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales |
| title_fullStr | Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales |
| title_full_unstemmed | Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales |
| title_short | Observation of fluxes over mountain areas in Chongqing and analysis of their variation characteristics in different time scales |
| title_sort | observation of fluxes over mountain areas in chongqing and analysis of their variation characteristics in different time scales |
| topic | momentum flux laten heat flux sensible heat flux |
| url | http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2021.02.013 |
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