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Ocean air masses from the East Asian monsoon dominate the land-surface atmospheric water cycles in the coastal areas of Liaodong Bay,Northeast China |
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| Authors: | Yi-Yuan Du Ri-Hong Wen Qing-Yu Jia Lu-Lu Liu Yue-Hua Hu Jia-Yuan Li Jie Pan Xia Yuan Jiang Peng Sissou Zakari Shristee Panthee Liang Song Wen-Jie Liu Bin Yang |
| Affiliation: | 1. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan, China;2. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning, China;3. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan, China College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China;4. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan, China Institute of International Rivers and Eco-Security, Yunnan University, Kunming, China;5. Ecological Meteorology and Satellite Remote Sensing Center of Liaoning Province, Liaoning Meterological Adminstration, Shenyang, Liaoning, China;6. Laboratory of Hydraulics and Environmental Modeling (HydroModE-Lab), Faculty of Agronomy, University of Parakou, Parakou, Benin;7. Leibniz Institute of Vegetable and Ornamental Crops (IGZ), Theodor-Echtermeyer-Weg 1, Großbeeren, Germany |
| Abstract: | Long-term atmospheric water vapour hydrogen (δ2H), oxygen (δ18O) and deuterium excess (d-excess) can provide unique insights into the land-atmosphere coupling processes. The in-situ measurements of atmospheric water vapour δ2H, δ18O and d-excess were conducted above a reed wetland of Liaodong Bay (2019–2020). We found significant inter-annual variations in atmospheric water vapour isotopes between the two growing (May–September) seasons. The δ2H, δ18O and d-excess of atmospheric water vapour exhibited different seasonal and diurnal cycles concerning the vertical measurement heights, especially in 2019. The isotopic differences of atmospheric water vapour among vertical measurement heights were more evident in the daytime. Rainfall events directly impacted the diurnal patterns of water vapour isotopes, and the influences depended on rainfall intensities. However, only weak correlations existed between water vapour isotopes and local meteorological factors (R2 = 0.01–0.16, p < 0.001), such as water vapour concentration (w), Relative Humidity (RH) and surface air temperature (Ta). Based on the back-air trajectory analyses, the spatial–temporal dynamics of atmospheric water vapour isotopes are highly synchronized with monsoon activities. Different water vapour sources influence the water vapour isotope in this region and the higher d-excess value is related to the intense convection brought by the monsoon. High-resolution measurements of atmospheric water vapour isotopes will improve our understanding of the hydrological cycles in coastal areas. |
| Keywords: | atmospheric water vapour isotopes back trajectory deuterium excess in situ measurement Liaodong Bay wetland |