DOI: 10.1002/2017MS001185
Scopus记录号: 2-s2.0-85042349499
论文题名: Global Effects of Superparameterization on Hydrothermal Land-Atmosphere Coupling on Multiple Timescales
作者: Qin H ; , Pritchard M ; S ; , Kooperman G ; J ; , Parishani H
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期: 2 起始页码: 530
结束页码: 549
语种: 英语
英文关键词: Moisture
; Rain
; Soil moisture
; Atmospheric model intercomparison projects
; Bowen ratio
; Climate change prediction
; Community atmosphere model
; General circulation model
; Land-atmosphere couplings
; Moisture interference
; Superparameterization
; Climate change
英文摘要: Many conventional General Circulation Models (GCMs) in the Global Land-Atmosphere Coupling Experiment (GLACE) tend to produce what is now recognized as overly strong land-atmosphere (L-A) coupling. We investigate the effects of cloud Superparameterization (SP) on L-A coupling on timescales beyond diurnal where it has been recently shown to have a favorable muting effect hydrologically. Using the Community Atmosphere Model v3.5 (CAM3.5) and its Superparameterized counterpart SPCAM3.5, we conducted soil moisture interference experiments following the GLACE and Atmospheric Model Intercomparison Project (AMIP) protocols. The results show that, on weekly-to-subseasonal timescales, SP also mutes hydrologic L-A coupling. This is detectable globally, and happens through the evapotranspiration-precipitation segment. But on seasonal timescales, SP does not exhibit detectable effects on hydrologic L-A coupling. Two robust regional effects of SP on thermal L-A coupling have also been explored. Over the Arabian Peninsula, SP reduces thermal L-A coupling through a straightforward control by mean rainfall reduction. More counterintuitively, over the Southwestern US and Northern Mexico, SP enhances the thermal L-A coupling in a way that is independent of rainfall and soil moisture. This signal is associated with a systematic and previously unrecognized effect of SP that produces an amplified Bowen ratio, and is detectable in multiple SP model versions and experiment designs. In addition to amplifying the present-day Bowen ratio, SP is found to amplify the climate sensitivity of Bowen ratio as well, which likely plays a role in influencing climate change predictions at the L-A interface. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75653
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth System Science, University of California, Irvine, CA, United States; Department of Geography, University of Georgia, Athens, GA, United States
Recommended Citation:
Qin H,, Pritchard M,S,et al. Global Effects of Superparameterization on Hydrothermal Land-Atmosphere Coupling on Multiple Timescales[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(2)