Publication Abstracts
Nusbaumer et al. 2017
, T.E. Wong, C. Bardeen, and D. Noone, 2017: Evaluating hydrological processes in the Community Atmosphere Model Version 5 (CAM5) using stable isotope ratios of water. J. Adv. Model. Earth Syst., 9, no. 2, 949-977, doi:10.1002/2016MS000839.
Water isotope-enabled climate and earth system models are able to directly simulate paleoclimate proxy records to aid in climate reconstruction. A less used major advantage is that water isotopologues provide an independent constraint on many atmospheric and hydrologic processes, allowing the model to be developed and tuned in a more physically accurate way. This paper describes the new isotope-enabled CAM5 model, including its isotopic physics routines, and its ability to simulate the modern distribution of water isotopologues in vapor and precipitation. It is found that the model has a negative isotopic bias in precipitation. This bias is partially attributed to model overestimates of deep convection, particularly over the midlatitude oceans during winter. This was determined by examining isotope ratios both in precipitation and vapor, instead of precipitation alone. This enhanced convective activity depletes the isotopic water vapor in the lower troposphere, where the majority of poleward moisture transport occurs, resulting in the insufficient transport of water isotopologue mass poleward and landward. This analysis also demonstrates that large-scale dynamical or moisture source changes can impact isotopologue values as much as local shifts in temperature or precipitation amount. The diagnosis of limitations in the large-scale transport characteristics has major implications if one is using isotope-enabled climate models to examine paleoclimate proxy records, as well as the modern global hydroclimate.
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BibTeX Citation
@article{nu01000b, author={Nusbaumer, J. and Wong, T. E. and Bardeen, C. and Noone, D.}, title={Evaluating hydrological processes in the Community Atmosphere Model Version 5 (CAM5) using stable isotope ratios of water}, year={2017}, journal={Journal of Advances in Modeling Earth Systems}, volume={9}, number={2}, pages={949--977}, doi={10.1002/2016MS000839}, }
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RIS Citation
TY - JOUR ID - nu01000b AU - Nusbaumer, J. AU - Wong, T. E. AU - Bardeen, C. AU - Noone, D. PY - 2017 TI - Evaluating hydrological processes in the Community Atmosphere Model Version 5 (CAM5) using stable isotope ratios of water JA - J. Adv. Model. Earth Syst. JO - Journal of Advances in Modeling Earth Systems VL - 9 IS - 2 SP - 949 EP - 977 DO - 10.1002/2016MS000839 ER -
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