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| Water vapor δD dynamics over China derived from SCIAMACHY satellite measurements | |
| 作者姓名： | LIU ZhongFang Kei YOSHIMURA Casey D. KENNEDY WANG XinHui & PANG ShuoGuang |
| 基金项目： | supported by the JSPS Fellowship;National Natural Science Foundation of China(Grant No.41171022);Tianjin Municipal Education Commission(Grant No.20080520) |
| 摘 要： | This study investigates water vapor isotopic patterns and controls over China using high-quality water vapor δD data retrieved from the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography(SCIAMACHY) observations.The results show that water vapor δD values on both annual and seasonal time-scales broadly exhibit a continental effect,with values largely decreasing northwestward from coastal lowlands to high-elevation mountainous regions.However,region-specific analysis reveals spatially distinct patterns of water vapor δD between seasons.In the monsoon domain(e.g.,China south of 35°N),depletion in D in the summer and fall seasons is closely tied to monsoon moisture sources(the Indian and Pacific oceans) and subsequent amount effect,but higher δD values in winter and spring are a result of isotopically-enriched continental-sourced moisture proceeded by less rainout.In contrast,farther inland in China(non-monsoon domain),moisture is derived overwhelmingly from the dry continental air masses and local evaporation,and δD values are largely controlled by the temperature effect,exhibiting a seasonality with isotopically enriched summer and depleted winter/spring.The observation that the spatial pattern of water vapor δD is the opposite to that of precipitation δD in the summer season also suggests that partial evaporation of falling raindrops is a key driver of water vapor isotope in the non-monsoon domain.This study highlights the importance of non-Rayleigh factors in governing water vapor isotope,and provides constraints on precipitation isotope interpretation and modern isotope hydrological processes over China. |
| 关 键 词： | water vapor δD moisture sources evapotranspiration droplet evaporation China |
Water vapor δD dynamics over China derived from SCIAMACHY satellite measurements |
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| LIU ZhongFang,Kei YOSHIMURA,Casey D. KENNEDY,WANG XinHui & PANG ShuoGuang.Water vapor δD dynamics over China derived from SCIAMACHY satellite measurements[J].Science China Earth Sciences,2014,57(4):813-823. | |
| Authors: | ZhongFang Liu Kei Yoshimura Casey D Kennedy XinHui Wang ShuoGuang Pang |
| Institution: | 1. Tianjin Key Laboratory of Water Resource and Environment, Tianjin Normal University, Tianjin, 300387, China 2. Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, 2778568, Japan 3. United States Department of Agriculture, Agricultural Research Service, Pasture Systems and Watershed Management Research Unit, East Wareham, MA, 02538, USA |
| Abstract: | This study investigates water vapor isotopic patterns and controls over China using high-quality water vapor δD data retrieved from the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) observations. The results show that water vapor δD values on both annual and seasonal time-scales broadly exhibit a continental effect, with values largely decreasing northwestward from coastal lowlands to high-elevation mountainous regions. However, region-specific analysis reveals spatially distinct patterns of water vapor δD between seasons. In the monsoon domain (e.g., China south of 35°N), depletion in D in the summer and fall seasons is closely tied to monsoon moisture sources (the Indian and Pacific oceans) and subsequent amount effect, but higher δD values in winter and spring are a result of isotopically-enriched continental-sourced moisture proceeded by less rainout. In contrast, farther inland in China (non-monsoon domain), moisture is derived overwhelmingly from the dry continental air masses and local evaporation, and δD values are largely controlled by the temperature effect, exhibiting a seasonality with isotopically enriched summer and depleted winter/spring. The observation that the spatial pattern of water vapor δD is the opposite to that of precipitation δD in the summer season also suggests that partial evaporation of falling raindrops is a key driver of water vapor isotope in the non-monsoon domain. This study highlights the importance of non-Rayleigh factors in governing water vapor isotope, and provides constraints on precipitation isotope interpretation and modern isotope hydrological processes over China. |
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