%0 Journal Article
%@issn 0930-7575
%F lattes: 2194275113941232 7 AshfaqCRTIOAKATSMZDCG:2020:RoLaTw
%T Robust late twenty-first century shift in the regional monsoons in RegCM-CORDEX simulations
%D 2020
%9 journal article
%A Ashfaq, Moetasim,
%A Cavazos, Tereza,
%A Reboita, Michelle Sim§es,
%A Torres-Alavez, JosÚ Abraham,
%A Im, Eun-Soon,
%A Olusegun, Christiana Funmilola,
%A Alves, Lincoln Muniz,
%A Key, Kesondra,
%A Adeniyi, Mojisola O.,
%A Tall, Moustapha,
%A Sylla, Mouhamadou Bamba,
%A Mehmood, Shahid,
%A Zafar, Qudsia,
%A Das, Sushant,
%A Diallo, Ismaila,
%A Coppola, Erika,
%A Giorgi, Filippo,
%@affiliation Oak Ridge National Laboratory
%@affiliation Center for Scientifc Research and Higher Education of Ensenada
%@affiliation Universidade Federal de Itajubß (UNIFEI)
%@affiliation Abdus Salam International Centre for Theoretical Physics
%@affiliation Hong Kong University of Science and Technology
%@affiliation National Space Research and Development Agency, Anyigba, Nigeria
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Oak Ridge National Laboratory
%@affiliation University of Ibadan
%@affiliation UniversitÚ Cheikh Anta Diop, Dakar-Fann
%@affiliation African Institute for Mathematical Sciences
%@affiliation Oak Ridge National Laboratory
%@affiliation Global Change Impact Studies Centre, Islamabad, Pakistan
%@affiliation Abdus Salam International Centre for Theoretical Physics,
%@affiliation University of California-Los Angeles
%@affiliation Abdus Salam International Centre for Theoretical Physics,
%B Climate Dynamics
%V 55
%P 1
%X We use an unprecedented ensemble of regional climate model (RCM) projections over seven regional CORDEX domains to provide, for the frst time, an RCM-based global view of monsoon changes at various levels of increased greenhouse gas (GHG) forcing. All regional simulations are conducted using RegCM4 at a 25 km horizontal grid spacing using lateral and lower boundary forcing from three General Circulation Models (GCMs), which are part of the ffth phase of the Coupled Model Inter-comparison Project (CMIP5). Each simulation covers the period from 1970 through 2100 under two Representative Concentration Pathways (RCP2.6 and RCP8.5). Regional climate simulations exhibit high fdelity in capturing key characteristics of precipitation and atmospheric dynamics across monsoon regions in the historical period. In the future period, regional monsoons exhibit a spatially robust delay in the monsoon onset, an increase in seasonality, and a reduction in the rainy season length at higher levels of radiative forcing. All regions with substantial delays in the monsoon onset exhibit a decrease in pre-monsoon precipitation, indicating a strong connection between pre-monsoon drying and a shift in the monsoon onset. The weakening of latent heat driven atmospheric warming during the pre-monsoon period delays the overturning of atmospheric subsidence in the monsoon regions, which defers their transitioning into deep convective states. Monsoon changes under the RCP2.6 scenario are mostly within the baseline variability.
%@language en
%3 ashfaq_robust3.pdf