Attribution of declining Western U.S. Snowpack to human effects

David W. Pierce, Tim P. Barnett, Hugo G. Hidalgo, Tapash Das, Céline Bonfils, Benjamin D. Santer, Govindasamy Bala, Michael D. Dettinger, Daniel R. Cayan, Art Mirin, Andrew W. Wood, Toru Nozawa

Research output: Contribution to journalArticle

167 Citations (Scopus)

Abstract

Observations show snowpack has declined across much of the western United States over the period 1950-99. This reduction has important social and economic implications, as water retained in the snowpack from winter storms forms an important part of the hydrological cycle and water supply in the region. A formal model-based detection and attribution (D-A) study of these reductions is performed. The detection variable is the ratio of 1 April snow water equivalent (SWE) to water-year-to-date precipitation (P), chosen to reduce the effect of P variability on the results. Estimates of natural internal climate variability are obtained from 1600 years of two control simulations performed with fully coupled ocean-atmosphere climate models. Estimates of the SWE/P response to anthropogenic greenhouse gases, ozone, and some aerosols are taken from multiple-member ensembles of perturbation experiments run with two models. The D-A shows the observations and anthropogenically forced models have greater SWE/P reductions than can be explained by natural internal climate variability alone. Model-estimated effects of changes in solar and volcanic forcing likewise do not explain the SWE/P reductions. The mean model estimate is that about half of the SWE/P reductions observed in the west from 1950 to 1999 are the result of climate changes forced by anthropogenic greenhouse gases, ozone, and aerosols.

Original languageEnglish
Pages (from-to)6425-6444
Number of pages20
JournalJournal of Climate
Volume21
Issue number23
DOIs
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

snow water equivalent
snowpack
greenhouse gas
ozone
aerosol
hydrological cycle
climate
climate modeling
water supply
perturbation
effect
water
climate change
atmosphere
winter
ocean
economics
simulation
detection
experiment

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Pierce, D. W., Barnett, T. P., Hidalgo, H. G., Das, T., Bonfils, C., Santer, B. D., ... Nozawa, T. (2008). Attribution of declining Western U.S. Snowpack to human effects. Journal of Climate, 21(23), 6425-6444. https://doi.org/10.1175/2008JCLI2405.1

Attribution of declining Western U.S. Snowpack to human effects. / Pierce, David W.; Barnett, Tim P.; Hidalgo, Hugo G.; Das, Tapash; Bonfils, Céline; Santer, Benjamin D.; Bala, Govindasamy; Dettinger, Michael D.; Cayan, Daniel R.; Mirin, Art; Wood, Andrew W.; Nozawa, Toru.

In: Journal of Climate, Vol. 21, No. 23, 2008, p. 6425-6444.

Research output: Contribution to journalArticle

Pierce, DW, Barnett, TP, Hidalgo, HG, Das, T, Bonfils, C, Santer, BD, Bala, G, Dettinger, MD, Cayan, DR, Mirin, A, Wood, AW & Nozawa, T 2008, 'Attribution of declining Western U.S. Snowpack to human effects', Journal of Climate, vol. 21, no. 23, pp. 6425-6444. https://doi.org/10.1175/2008JCLI2405.1
Pierce DW, Barnett TP, Hidalgo HG, Das T, Bonfils C, Santer BD et al. Attribution of declining Western U.S. Snowpack to human effects. Journal of Climate. 2008;21(23):6425-6444. https://doi.org/10.1175/2008JCLI2405.1
Pierce, David W. ; Barnett, Tim P. ; Hidalgo, Hugo G. ; Das, Tapash ; Bonfils, Céline ; Santer, Benjamin D. ; Bala, Govindasamy ; Dettinger, Michael D. ; Cayan, Daniel R. ; Mirin, Art ; Wood, Andrew W. ; Nozawa, Toru. / Attribution of declining Western U.S. Snowpack to human effects. In: Journal of Climate. 2008 ; Vol. 21, No. 23. pp. 6425-6444.
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