Impacts of improved horizontal resolutions in the simulations of mean and extreme precipitation using CMIP6 HighResMIP models over West Africa

被引:0
|
作者
Ajibola, Felix Olabamiji [1 ]
Afolayan, Stella Abosede [2 ]
机构
[1] Nigerian Meteorol Agcy, Natl Weather Forecasting & Climate Res Ctr, Nnamdi Azikiwe Int Airport,PMB 615, Abuja, Nigeria
[2] North Carolina A&T State Univ, Greensboro, NC 27411 USA
关键词
Mean precipitation; Extreme precipitation; HighResMIP; CMIP6; Resolution; Bias adjustment; REGIONAL CLIMATE MODEL; CORDEX-AFRICA; PROJECTIONS; TEMPERATURE; VARIABILITY; PERFORMANCE; CYCLE;
D O I
10.1007/s10661-024-12492-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We conducted an analysis of 16 historical simulations from the High-Resolution Model Intercomparison Project (HighResMIP) as part of the Coupled Model Intercomparison Project (CMIP) phase 6 (CMIP6). These simulations encompass both high- and low-resolution models and aim to investigate the impact of improved horizontal resolution on mean and extreme precipitation in West Africa between 1985 and 2014. Six Expert Team on Climate Change Detection and Indices (ETCCDI) were used to charactererize extreme indices. Bias adjustment was used to detect and adjust the biases in the models. Our observations indicate that the southeastern and southwestern regions of West Africa experience the most significant precipitation, which aligns with the simulations from HighResMIP. The enhanced horizontal resolution notably influences the simulation of orographically induced rainfall in elevated areas and intensifies precipitation in various aspects. When examining the highest 1-day precipitation, our observations reveal that most of the Guinea Coast region had 1-day rainfall exceeding 100 mm. However, this was overestimated and in some simulations underestimated by HighResMIP simulations. Furthermore, an increase in horizontal resolution appears to enhance the ability of high-resolution models to replicate the observed patterns of heavy precipitation (R10mm) and very heavy rainfall (R20mm) days. Spatial and temporal analysis suggests that uncertainty exists in the simulation of extreme precipitation in both high- and low-resolution simulations over West Africa. Also, bias adjustment shows a significant bias in the simulations. To address this issue, we employed a bias adjustment approach.
引用
收藏
页数:23
相关论文
共 50 条
  • [31] Evaluation of CMIP6 models for simulations of diurnal temperature range over Africa
    Babaousmail, Hassen
    Ayugi, Brian Odhiambo
    Ojara, Moses
    Ngoma, Hamida
    Oduro, Collins
    Mumo, Richard
    Ongoma, Victor
    [J]. JOURNAL OF AFRICAN EARTH SCIENCES, 2023, 202
  • [32] Evaluation of Extreme Temperatures Over Australia in the Historical Simulations of CMIP5 and CMIP6 Models
    Deng, Xu
    Perkins-Kirkpatrick, Sarah E.
    Lewis, Sophie C.
    Ritchie, Elizabeth A.
    [J]. EARTHS FUTURE, 2021, 9 (07)
  • [33] Biases Beyond the Mean in CMIP6 Extreme Precipitation: A Global Investigation
    Abdelmoaty, Hebatallah Mohamed
    Papalexiou, Simon Michael
    Rajulapati, Chandra Rupa
    AghaKouchak, Amir
    [J]. EARTHS FUTURE, 2021, 9 (10)
  • [34] Assessment of Extreme Precipitation Indices over Indochina and South China in CMIP6 Models
    Tang, Bin
    Hu, Wenting
    Duan, Anmin
    [J]. JOURNAL OF CLIMATE, 2021, 34 (18) : 7507 - 7524
  • [35] Evaluation of historical CMIP6 model simulations of extreme precipitation over contiguous US regions
    Srivastava, Abhishekh
    Grotjahn, Richard
    Ullrich, Paul A.
    [J]. WEATHER AND CLIMATE EXTREMES, 2020, 29
  • [36] Performance of CMIP6 HighResMIP on the Representation of Onset and Cessation of Seasonal Rainfall in Southern West Africa
    Nkrumah, Francis
    Quagraine, Kwesi Akumenyi
    Quagraine, Kwesi Twentwewa
    Wainwright, Caroline
    Quenum, Gandome Mayeul Leger Davy
    Amankwah, Abraham
    Klutse, Nana Ama Browne
    [J]. ATMOSPHERE, 2022, 13 (07)
  • [37] Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution
    Ju Liang
    Mou Leong Tan
    Matthew Hawcroft
    Jennifer L. Catto
    Kevin I. Hodges
    James M. Haywood
    [J]. Climate Dynamics, 2022, 58 : 2783 - 2805
  • [38] Evaluation of the CMIP6 Precipitation Simulations Over Global Land
    Li, Zhengyang
    Liu, Tie
    Huang, Yue
    Peng, Jiabin
    Ling, Yunan
    [J]. EARTHS FUTURE, 2022, 10 (08)
  • [39] Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution
    Liang, Ju
    Tan, Mou Leong
    Hawcroft, Matthew
    Catto, Jennifer L.
    Hodges, Kevin I.
    Haywood, James M.
    [J]. CLIMATE DYNAMICS, 2022, 58 (9-10) : 2783 - 2805
  • [40] Future Changes in Precipitation Extremes over East Africa Based on CMIP6 Models
    Ayugi, Brian
    Dike, Victor
    Ngoma, Hamida
    Babaousmail, Hassen
    Mumo, Richard
    Ongoma, Victor
    [J]. WATER, 2021, 13 (17)