Abstract
Environmental prediction is one of the crucial means for social sustainable development. Based on the continuous sampling of atmospheric precipitation in Guanling County, Guizhou Province, China, from March 2016 to February 2017, and combining the reanalyzed data of the National Centre for Environmental Prediction/National Centre for Atmospheric Research with the Hybrid Single-Particle Lagrangian Integrated Trajectory model, this paper analyzed the variations of δ2H and δ18O in precipitation at the synoptic scale in the Guanling region. The results showed that the variations of δ2H, δ18O, and d-excess values in precipitation exhibited remarkable seasonal variability. The stable isotopic values in precipitation in the winter half-year were higher than those in the summer half-year. The meteoric water line of the winter half-year was close to the annual meteoric water line. The results showed that there was more than one fundamental source of moisture. It was affected by the winter monsoon period, which is longer than the summer monsoon period, so the local evaporation of water vapor participating in the water circulation had a greater impact. With the increase of precipitation, the intercept and slope of the meteoric water line gradually decreased, which indicated that the secondary evaporation was weak under the effect of stable isotope subcloud cluster. The correlations of precipitation δ18O with temperature T and precipitation P vary with time scales. As the time scale decreased, the correlation between δ18O and the temperature and precipitation improved. When P ≤ 5 mm and 10°C < T ≤ 30°C, the most sensitive changes in stable isotopes were observed. In the study area, the backward trajectory model showed that the moisture in the winter half of the year was mainly from the transportation of the westerlies wind, replenishment, and local reevaporation of near-source ocean water, while the water in the summer half of the year mainly came from the transportation of water from the ocean at low latitudes.
Highlights
Precipitation is the most active factor in the exchange of matter and energy between the atmosphere and the hydrosphere, and it is an important part of the water cycle.e composition of stable isotope in precipitation is closely related to the meteorological process of precipitation, the initial state of the water vapor source region, and the situation of large-scale circulation. e monitoring of precipitations δ2H and δ18O will provide fundamental data for the study of water cycles in present and past climates using stable isotope techniques [1].e study of stable isotopes in precipitation began in the early 1950s
More than 800 precipitation sampling stations have been established worldwide, their purpose is to analyze the change in time and space and to identify global and local atmospheric circulation patterns and the water cycle mechanism [2]. e study of stable isotopes in the water cycle started relatively late in China, beginning with the scientific expedition to Mount Everest in 1966 [3]. e Global Network for Isotopes in Precipitation (GNIP) in China gradually began to establish multiple monitoring stations for a long time, but it is still difficult to meet the needs of scientific research
Zhang et al conducted an in-depth study on stable isotopes of precipitation over a large spatial scale in southwest China [6]. e characteristics of stable isotope variation of precipitation in southwest China are analyzed from synoptic, seasonal, and interannual scales. e study found that the changes in precipitation δ2H and δ18O in this area have obvious amount effects, humidity effects, and antitemperature effects, and the d-excess values in precipitation showed significant seasonal differences. erefore, it is necessary to expand the precipitation isotope research in Guizhou area to increase the isotope data in this area and conduct a comprehensive and in-depth study of the southwest monsoon region of China
Summary
Precipitation is the most active factor in the exchange of matter and energy between the atmosphere and the hydrosphere, and it is an important part of the water cycle. E monitoring of precipitations δ2H and δ18O will provide fundamental data for the study of water cycles in present and past climates using stable isotope techniques [1]. More than 800 precipitation sampling stations have been established worldwide, their purpose is to analyze the change in time and space and to identify global and local atmospheric circulation patterns and the water cycle mechanism [2]. Zhang et al conducted an in-depth study on stable isotopes of precipitation over a large spatial scale in southwest China [6]. Erefore, it is necessary to expand the precipitation isotope research in Guizhou area to increase the isotope data in this area and conduct a comprehensive and in-depth study of the southwest monsoon region of China. Erefore, this paper analyzed the meteorological data and stable isotope data of precipitation samples in the hydrological years from March 2016 to February 2017 in Guanling, Guizhou Province. rough the propagation path of the model results, combined with the precipitation of the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) into the air, the formation of the regional precipitation water vapor source, the water cycle area, and the palaeoclimate research are discussed, provide a scientific basis for follow-up research
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