A meta-analysis of water vapor deuterium-excess in the midlatitude atmospheric surface layer

Authors

  • Lisa R. Welp,

    Corresponding author
    1. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
    • Corresponding author: L. R. Welp, Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0244, USA. (lwelp@ucsd.edu)

    Search for more papers by this author
  • Xuhui Lee,

    1. Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing, China
    2. School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, USA
    Search for more papers by this author
  • Timothy J. Griffis,

    1. Department of Soil, Water, and Climate, University of Minnesota, Twin Cities, St. Paul, Minnesota, USA
    Search for more papers by this author
  • Xue-Fa Wen,

    1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
    Search for more papers by this author
  • Wei Xiao,

    1. Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing, China
    Search for more papers by this author
  • Shenggong Li,

    1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
    Search for more papers by this author
  • Xiaomin Sun,

    1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
    Search for more papers by this author
  • Zhongmin Hu,

    1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
    Search for more papers by this author
  • Maria Val Martin,

    1. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
    Search for more papers by this author
  • Jianping Huang

    1. Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing, China
    2. I. M. System Group, Environmental Modeling Center, NOAA National Centers for Environmental Prediction, Camp Springs, Maryland, USA
    Search for more papers by this author

Abstract

[1] Deuterium-excess (d) in water is a combination of the oxygen (δ18O) and hydrogen (δD) isotope ratios, and its variability is thought to indicate the location and environmental conditions of the marine moisture source. In this study, we analyze d of water vapor (dv) from six sites, all between 37 and 44°N to examine patterns in the atmospheric surface layer and identify the main drivers of variability. Two sites are in urban settings (New Haven, CT, USA and Beijing, China), two sites are in agricultural settings (Rosemount, MN, USA and Luancheng, China), and two sites are in natural ecosystems, a forest (Borden Forest, Ontario, Canada) and a grassland (Duolun, China). We found a robust diurnal cycle in dvat all sites with maximum values during mid-day. Isotopic land surface model simulations suggest that plant transpiration is one mechanism underlying the diurnal pattern. An isotopic large-eddy simulation model shows that entrainment of the free atmosphere into the boundary layer can also produce highdvvalues in mid-day. Daily mid-day means ofdvwere negatively correlated with local mid-day relative humidity and positively correlated with planetary boundary layer height at the North American sites, but not the Chinese sites. The mechanism for these differences is still undetermined. These results demonstrate that within the diurnal time scale,dv of the surface air at continental locations can be significantly altered by local processes, and is therefore not a conserved tracer of humidity from the marine moisture source region as has previously been assumed.

Ancillary