Precipitation-temperature relationships over Europe in CORDEX regional climate models

0565362 - ÚVGZ 2023 RIV GB eng J - Článek v odborném periodiku
Lhotka, Ondřej - Kyselý, J.
Precipitation-temperature relationships over Europe in CORDEX regional climate models.
International Journal of Climatology. Roč. 42, č. 9 (2022), s. 4868-4880. ISSN 0899-8418. E-ISSN 1097-0088
Grant CEP: GA MŠMT(CZ) EF16_019/0000797
Institucionální podpora: RVO:86652079
Klíčová slova: cordex * Europe * precipitation * regional climate models * standardized precipitation index * temperature
Obor OECD: Meteorology and atmospheric sciences
Impakt faktor: 3.9, rok: 2022
Způsob publikování: Omezený přístup
https://rmets.onlinelibrary.wiley.com/doi/10.1002/joc.7508

We studied spatial and temporal patterns of precipitation-temperature (P-T) relationships through correlations between monthly standardized precipitation index (SPI) and monthly temperature anomalies in individual climatic seasons over Europe. In the observed data (represented by E-OBS), positive correlations (wet-warm/dry-cold relationships) prevail during winter over most of Europe, while negative values (dry-warm/wet-cold) are dominant in summer. In the next step, an ensemble of seven regional climate models (RCMs) from the CORDEX project driven by the ERA-Interim reanalysis were examined as to their reproduction of the regional patterns of the P-T correlations. In winter, the RCMs yielded overly strong positive P-T correlations over northern Europe, while the correlations were too weak in the south compared to observed data. During summer, the biases were generally larger, the RCMs were able to capture the overall negative P-T correlations but these tended to be too weak over northern Europe. This deficiency was found to be linked to simulated differences in shortwave radiation (a proxy for cloud cover) between dry and wet months. In western, central, and southeastern Europe, by contrast, most RCMs yielded too strong negative correlations in summer, and overly large decreases of relative humidity during dry months probably contributed to these errors. The results pointed up issues that should be addressed as the reported RCMs' deficiencies may lower credibility of projected compound dry-hot events in climate change scenarios.
Trvalý link: https://hdl.handle.net/11104/0336915