Skip navigation
Skip navigation

Using radiative signatures to diagnose the cause of warming during the 2013–2014 Californian drought

Wolf, Sebastian; Yin, Dongqin; Roderick, Michael

Description

California recently experienced among the worst droughts of the last century, with exceptional precipitation deficits and co-occurring record high temperatures. The dry conditions caused severe water shortages in one of the economically most important agricultural regions of the US. It has recently been hypothesized that anthropogenic warming is increasing the likelihood of such extreme droughts in California, or more specifically, that warmer temperatures from the enhanced greenhouse effect...[Show more]

dc.contributor.authorWolf, Sebastian
dc.contributor.authorYin, Dongqin
dc.contributor.authorRoderick, Michael
dc.date.accessioned2018-01-09T01:14:27Z
dc.identifier.issn0022-1694
dc.identifier.urihttp://hdl.handle.net/1885/139104
dc.description.abstractCalifornia recently experienced among the worst droughts of the last century, with exceptional precipitation deficits and co-occurring record high temperatures. The dry conditions caused severe water shortages in one of the economically most important agricultural regions of the US. It has recently been hypothesized that anthropogenic warming is increasing the likelihood of such extreme droughts in California, or more specifically, that warmer temperatures from the enhanced greenhouse effect intensify drought conditions. However, separating the cause and effect is difficult because the dry conditions lead to a reduction in evaporative cooling that contributes to the warming. Here we investigate and compare the forcing of long-term greenhouse-induced warming with the short-term warming during the 2013–2014 Californian drought. We use the concept of radiative signatures to investigate the source of the radiative perturbation during the drought, relate the signatures to expected changes due to anthropogenic warming, and assess the cause of warming based on observed changes in the surface energy balance compared to the period 2001–2012. We found that the recent meteorological drought based on precipitation deficits was characterised by an increase in incoming shortwave radiation coupled with a decline in incoming longwave radiation, which contributed to record warm temperatures. In contrast, climate models project that anthropogenic warming is accompanied by little change in incoming shortwave but a large increase in incoming longwave radiation. The warming during the drought was associated with increased incoming shortwave radiation in combination with reduced evaporative cooling from water deficits, which enhanced surface temperatures and sensible heat transfer to the atmosphere. Our analyses demonstrate that radiative signatures are a powerful tool to differentiate the source of perturbations in the surface energy balance at monthly to seasonal time scales.
dc.description.sponsorshipThis research was supported by the European Commission’s FP7 (S.W., Marie Curie International Outgoing Fellowship, grant 300083) and ETH Zurich. D.Y and M.L.R are supported by the Australian Research Council (CE11E0098), and D.Y. acknowledges support by the National Natural Science Foundation of China (51609122).
dc.format.mimetypeapplication/pdf
dc.publisherElsevier
dc.rights© 2017 Elsevier B.V.
dc.sourceJournal of Hydrology
dc.titleUsing radiative signatures to diagnose the cause of warming during the 2013–2014 Californian drought
dc.typeJournal article
local.identifier.citationvolume553
dc.date.issued2017
local.publisher.urlhttps://www.elsevier.com/
local.type.statusAccepted Version
local.contributor.affiliationRoderick, M. L., Research School of Biology, The Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/CE11E0098
local.bibliographicCitation.startpage408
local.bibliographicCitation.lastpage418
local.identifier.doi10.1016/j.jhydrol.2017.07.015
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0022-1694/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 9/01/18).
CollectionsANU Research Publications

Download

File Description SizeFormat Image
1-s2.0-S0022169417304663-main.pdf1.29 MBAdobe PDFThumbnail


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator