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Revisiting the Seasonal Evolution of the Indian Ocean Dipole from the Perspective of Process-Based Decomposition

Journal of Ocean University of China 2023年第6期22卷 1453-1463页

作者： ZHANG Guangli FAN Hanjie HUANG Ke LONG Tong SONG Wei XIE Qiang School of Marine Sciences Sun-Yat Sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Institute of Deep-Sea Sciences and Engineering Chinese Academy of SciencesSanya 572000China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

The seasonal phase-locking feature of the Indian Ocean Dipole(IOD)is well ***,the seasonality ten-dency of sea surface temperature anomalies(SSTAs)during the development of the IOD has not been widely *** SSTA tendencies over the two centers of the IOD peak in September-October-November are of different monthly *** SSTA tendency over the west pole is small before June-July-August but dramatically increases in ***,the SSTA tendency over the east pole gradually increases before June-July-August and decreases since *** growth rate attribution of the SSTAs is achieved by examining the roles of radiative and non-radiative air-sea coupled thermodynamic processes through the climate feedback-response analysis method(CFRAM).The CFRAM results indicate that oceanic dynamic processes largely contribute to the total SSTA tendency for initiating and fueling the IOD SSTAs,similar to previous ***,these results cannot ex-plain the monthly amplitudes of SSTA *** negative feedback processes(cloud radiative feedback,atmospheric dynamic processes,surface sensible,and latent heat flux)together play a damping role opposite to the SSTA ***,the sea surface temperature-water vapor feedback shows positive ***,variations in SSTAs can change water vapor con-centrations through evaporation,resulting in anomalous longwave radiation that amplifies the initial SSTAs through positive *** effect of water vapor feedback is well in-phase with the monthly amplitudes of SSTA tendency,suggesting that the water vapor feedback might modulate the seasonally dependent SSTA tendency during the development of the IOD.

关键词： Indian Ocean Dipole climate feedback-response analysis method growth rate of the sea surface temperature anomaly seasonally dependent sea surface temperature anomaly water vapor feedback

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Uncertainty in projections of the South Asian summer monsoon under global warming by CMIP6 models:Role of tropospheric meridional thermal contrast

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Atmospheric and Oceanic Science Letters 2022年第1期15卷 56-61页

作者： Yunqi Kong Yuting Wu Xiaoming Hu Yana Li Song Yang School of Atmospheric Science Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic AdministrationHangzhouChina Guangdong Province Key Laboratory for climate Change and Natural Disaster Studies Sun Yat-sen UniversityZhuhaiChina School of Energy and Environment City University of Hong KongHong KongChina

Driven by the increase in CO_(2)concentration,climate models reach a consensus that the large-scale circulation of the South Asian summer monsoon(SASM) becomes weakened but with different *** study investigates the major uncertainty sources of the SASM response to an abrupt quadrupling of CO_(2)(abrupt-4×CO_(2))in 18 models of phase 6 of the Coupled Model Intercomparison *** projected weakening of the SASM indicated by both zonal and meridional monsoon circulation indices is closely linked to decreases in the meridional gradient of upper-tropospheric temperature between Eurasia and the Indian Ocean(EUTT-IUTT).A climate feedback-response analysis method is applied to linearly decompose the uncertainty of changes in EUTT-IUTT into the partial changes due to external forcing and internal processes of the earth-atmosphere *** show that the uncertainty of changes in EUTT-IUTT is contributed positively by the dominant atmospheric dynamic process,followed by the cloud shortwave radiative effect,and negatively by the surface latent heat flux and cloud longwave radiative *** from CO_(2)forcing and other internal processes including albedo and water vapor feedbacks,oceanic heat storage,and sensible heat flux are found to be minor.

关键词： South Asian summer monsoon CMIP6 Uncertainty in model projection Meridional temperature gradient climate feedback-response analysis method

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