IAHS2022-561, updated on 23 Sep 2022
https://doi.org/10.5194/iahs2022-561
IAHS-AISH Scientific Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Intensive Quantification of Precipitation Moisture Sources in the Eastern Asian Monsoon Zone: A Modified Deuterium-excess-based Model

Fen Zhang1,2, Tianming Huang1,2, and Zhonghe Pang1,2
Fen Zhang et al.
  • 1Institute of Geology and Geophysics,Chinese Academy of Sciences, Key Laboratory of Shale Gas and Geoengineering , China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

Defining moisture sources and evolution of precipitation is significant for further exploration of complex hydro-climatic interactions, especially under global warming with alternations of evapotranspiration capacity and precipitation moisture source structure. As a sensitive indicator, dexcess has been widely used to quantify the proportion of recycled vapor to precipitation (fre). However, existing models ignore taking transpiration vapor into account and the calculated fre tends to be lower than the true value. Herein, it was modified with transpiration vapor considered and applied in Guyuan, China located in a monsoon marginal zone with complex precipitation moisture sources. After modification, the estimated annual average fre was increased from 7.5% to 14.8%. This study highlights the contribution of transpiration vapor to precipitation and provides more information on the formation and evolution of precipitation to better serve future hydro-climatic research. The article has been published in the Geophysical Research Letters (https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL095909).

Figure 1. Conceptual diagram of a modified d-excess-based model emphasizing d-excess for three end-members (advected, evaporation, and transpiration vapor) of precipitation moisture sources.

Figure 1. Conceptual diagram of a modified d-excess-based model emphasizing d-excess for three end-members (advected, evaporation, and transpiration vapor) of precipitation moisture sources.

Figure 2. (a) Map showing the locations of Guyuan precipitation station. (b) Main moisture sources of precipitation in China. (c) Distribution of annual mean monthly precipitation and air temperature in Guyuan.

Figure 2. (a) Map showing the locations of Guyuan precipitation station. (b) Main moisture sources of precipitation in China. (c) Distribution of annual mean monthly precipitation and air temperature in Guyuan.

 

Figure 3. (a) The LMWL of Guyuan. (b) The meteoric water lines of four seasons in Guyuan. (c) Variations in d-excess and δ18O over time in Guyuan.

Figure 3. (a) The LMWL of Guyuan. (b) The meteoric water lines of four seasons in Guyuan. (c) Variations in d-excess and δ18O over time in Guyuan.

 

Figure 4. Monthly fluctuations of recycling ratio (fre) with the original and modified model.

 

How to cite: Zhang, F., Huang, T., and Pang, Z.: Intensive Quantification of Precipitation Moisture Sources in the Eastern Asian Monsoon Zone: A Modified Deuterium-excess-based Model, IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-561, https://doi.org/10.5194/iahs2022-561, 2022.