Circulation-Conditioned Wintertime Temperature Bias in EURO-CORDEX Regional Climate Models Over Central Europe

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F18%3A00496412" target="_blank" >RIV/86652079:_____/18:00496412 - isvavai.cz</a>

Alternative codes found

RIV/68378289:_____/18:00492602

Result on the web

<a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD028503" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JD028503</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2018JD028503" target="_blank" >10.1029/2018JD028503</a>

Result language

angličtina

Original language name

Circulation-Conditioned Wintertime Temperature Bias in EURO-CORDEX Regional Climate Models Over Central Europe

Original language description

We analyze circulation-conditioned wintertime temperature biases in regional climate models (RCMs) over Central Europe and link them to simulation of cold days. Daily minimum and maximum temperatures from the European Coordinated Regional Climate Downscaling Experiment RCMs are evaluated against reference data from the E-OBS gridded data set. Flow direction is analyzed through u- and v-wind components at the 850-hPa pressure level taken from the ERA-Interim reanalysis. Cloud cover and snow-area fraction from the same reanalysis are used to associate the temperature biases with physical mechanisms. Distribution of flow directions during cold days is evaluated using efficiency coefficients, calculated as ratios of the relative abundance of flow directions during cold days and their wintertime climatology. RCMs driven by the reanalysis have both positive and negative minimum temperature biases, ranging from +0.7 to2.7 degrees C. By contrast, all reanalysis-driven RCMs have negative maximum temperature biases, especially during northerly and westerly advection, which is probably related to overestimated cloud cover. The too-cold westerly and northerly flows are associated with an overestimated number of cold days and relatively high values of efficiency coefficients under these directions. Efficiency coefficients are simulated better under southeasterly advection, during which the temperature bias tends to be the lowest. The results suggest that simulated cold events should be analyzed and interpreted with caution, since they may develop also under zonal flow in some models, which contradicts observations.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geophysical Research-Atmospheres

ISSN

2169-897X

e-ISSN

2169-8996

Volume of the periodical

123

Issue of the periodical within the volume

16

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

8661-8673

UT code for WoS article

000445331900017

EID of the result in the Scopus database

2-s2.0-85052816364