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Comment on Zhang Y., Ye S., and Wu J. 2011. A modified global model for predicting the tritium distribution in precipitation, 1960–2005. Hydrological Processes 25:2379–2392

Comment on Zhang Y., Ye S., and Wu J. 2011. A modified global model for predicting the tritium... Zhang et al . ( ; hereafter Z11) proposed a Modified Global Model of Tritium in Precipitation (MGMTP) and claim to have improved and extended the application of Doney et al .’s ( ; hereafter D92) original model (GMTP). We believe, however, that Z11 have incorrectly applied the GMTP and that their MGMTP approach has serious shortcomings which make it a poor substitute for the GMTP. According to Z11, one of the main deficiencies of the GMTP is that it under‐predicts values during the 1960s bomb pulse peak by about 50%. The annual mean concentration of tritium in precipitation with the GMTP is: (D92; Equation (4); page 5483): c p t = f 1 c ^ p t 1 + f 2 c ^ p t 2 + ε a t where c p (t) is the predicted annual tritium value at a location, f 1 and f 2 are the location coefficients, ĉ p ( t ,1) and ĉ p ( t ,2) are the reference curve values/normalized factors for the year for which an estimate is made, and ε a (t) is the uncertainty term. This function was derived by using ‘ decay‐corrected ’ tritium data http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hydrological Processes Wiley

Comment on Zhang Y., Ye S., and Wu J. 2011. A modified global model for predicting the tritium distribution in precipitation, 1960–2005. Hydrological Processes 25:2379–2392

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References (6)

Publisher
Wiley
Copyright
Copyright © 2013 John Wiley & Sons, Ltd.
ISSN
0885-6087
eISSN
1099-1085
DOI
10.1002/hyp.9581
Publisher site
See Article on Publisher Site

Abstract

Zhang et al . ( ; hereafter Z11) proposed a Modified Global Model of Tritium in Precipitation (MGMTP) and claim to have improved and extended the application of Doney et al .’s ( ; hereafter D92) original model (GMTP). We believe, however, that Z11 have incorrectly applied the GMTP and that their MGMTP approach has serious shortcomings which make it a poor substitute for the GMTP. According to Z11, one of the main deficiencies of the GMTP is that it under‐predicts values during the 1960s bomb pulse peak by about 50%. The annual mean concentration of tritium in precipitation with the GMTP is: (D92; Equation (4); page 5483): c p t = f 1 c ^ p t 1 + f 2 c ^ p t 2 + ε a t where c p (t) is the predicted annual tritium value at a location, f 1 and f 2 are the location coefficients, ĉ p ( t ,1) and ĉ p ( t ,2) are the reference curve values/normalized factors for the year for which an estimate is made, and ε a (t) is the uncertainty term. This function was derived by using ‘ decay‐corrected ’ tritium data

Journal

Hydrological Processes – Wiley

Published: Apr 15, 2013

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