Royal Dutch Meteorological Institute; Ministery Of Infrastructure And The Environment

Publications, presentations and other activities
Impact of land-atmosphere coupling on European summer blocking
by B.J.J.M. van den Hurk (KNMI), R.J. Haarsma (KNMI), F. Selten (KNMI), S. Seneviratne (ETH),

In a climate model experiment the impact of cutting the land-atmosphere interactions on atmospheric (blocking) circulations during summer in Europe is investigated. In an ensemble of simulations covering the period 1950 2000 with the ECHAM5/OMI model Z500 and Z975 storm activity during summer (JJA) was analysed, and compared to a model run with prescribed climatological soil conditions throughout the simulation. In this latter run, storm activity appeared to be higher in the main storm activity area over land. It was investigated whether this signature was also present in the frequency and duration of an index for blocked atmospheric circulation, but here an influence of land-atmosphere interactions was not convincingly present. An impact of land-atmosphere interactions on the persistence of long warm and dry summer episodes in Europe may require other diagnostics to be identified.

Bibliographic data
Hurk, B.J.J.M. van den, R.J. Haarsma, F. Selten and S. Seneviratne, Impact of land-atmosphere coupling on European summer blocking Abstract (html)  Complete text (pdf: 650 KB)