In:
Hydrology and Earth System Sciences, Copernicus GmbH, Vol. 26, No. 8 ( 2022-04-19), p. 1925-1936
Abstract:
Abstract. The inherently dry summer climate of the Iberian Peninsula (IP) is undergoing drought exacerbated by more intense warming and reduced
precipitation. Although many studies have studied changes in summer climate
factors, it is still unclear how the changes in moisture contribution from
the sources lead to the decrease in summer precipitation. This study
investigates the differences in the IP precipitationshed from 1980 to 1997
and 1998 to 2019 using the Water Accounting Model-2layers with ERA5 data, and assesses the role of local moisture recycling and external moisture in
reducing summer precipitation. Our findings indicate that the moisture
contributions from the local IP, and from the west and the east of the
precipitationshed, contributed 1.7, 3.6 and 1.1 mm per month less precipitation after 1997 than before 1997, accounting for 26 %, 57 % and 17 % of the main source supply reduction, respectively. The significant downward trend of the IP local moisture recycling closely links to the disappearance of the wet years after 1997 as well as the decrease in local contribution in the dry years. Moreover, the feedback between the weakened local moisture recycling and the drier land surface can exacerbate the local moisture scarcity and summer drought.
Type of Medium:
Online Resource
ISSN:
1607-7938
DOI:
10.5194/hess-26-1925-2022
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2022
detail.hit.zdb_id:
2100610-6
