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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Geography. ; Electronic books.
    Description / Table of Contents: This ground-breaking, systematic evaluation of the FGOALS climate change model covers the entire field, from its development to its latest applications. As well as explaining how to run FGOALS, it assesses the future potential of this powerful analytical tool.
    Type of Medium: Online Resource
    Pages: 1 online resource (468 pages)
    Edition: 1st ed.
    ISBN: 9783642418013
    Series Statement: Springer Earth System Sciences Series
    Language: English
    Note: Intro -- Foreword -- Contents -- Introduction -- Part IFGOALS Components for CMIP5 -- 1 Spectral Atmospheric General Circulation Model Version 2 -- Abstract -- 1.1…Brief Introduction of SAMIL -- 1.2…Dynamical Core of SAMIL -- 1.2.1 Vertical Hybrid Coordinate -- 1.2.2 Standard Atmosphere Subtraction -- 1.3…Parameterization of SAMIL -- Acknowledgments -- 2 The Grid-Point Atmospheric Model of IAP LASG--Version 2: GAMIL2 -- Abstract -- Acknowledgments -- 3 LASG/IAP Climate System Ocean Model Version 2: LICOM2 -- Abstract -- 3.1…Introduction -- 3.2…Model and Experiments -- 3.3…Results -- 3.3.1 Sea Surface Temperature -- 3.3.2 Zonal Mean Temperature -- 3.3.3 AMOC -- 3.4…Concluding Remarks -- Acknowledgments -- 4 LASG/IAP Sea Ice Model -- 5 FGOALS-s2 Brief -- Abstract -- 5.1…Introduction -- 5.2…Model Description -- 5.2.1 Atmospheric and Land Components -- 5.2.2 Oceanic and Sea Ice Components -- 5.3…Stability -- 5.4…Summary -- Acknowledgments -- 6 The Flexible Global Ocean--Atmosphere--Land System Model, Grid-Point Version 2: FGOALS-g2 -- Abstract -- 7 Terrestrial Carbon Cycle in FGOALS-s2 -- Abstract -- 7.1…Introduction -- 7.2…Dynamic Global Vegetation Model and Coupling Implementation -- Acknowledgments -- 8 Brief Overview of FGOALS CMIP5 Experiments -- Abstract -- 8.1…Introduction -- 8.2…Major Improvements of FGOALS Models Used in CMIP5 -- 8.3…Summary of FGOALS CMIP5 Experiments -- 8.4…Concluding Remarks -- Part IIModel Evaluation and Analyses -- 9 Overview of FGOALS Contribution to International Climate Modeling Community During Past Years -- Abstract -- 9.1…Introduction -- 9.2…ENSO and Monsoon -- 9.3…Cold Biases in High Latitudes -- 9.4…Past and Future Climate Change -- 9.5…Summary -- Acknowledgments -- 10 Long-Term Trends of Two Versions of FGOALS2 -- Abstract -- 10.1…Introduction -- 10.2…Model and Experiments -- 10.2.1 Model -- 10.2.2 Experiments. , 10.3…Results -- 10.3.1 SST -- 10.3.2 Sea Ice -- 10.3.3 Distribution of Zonal Mean Temperature and Salinity Trends -- 10.3.4 Comparison with Observations and Historical Runs -- 10.4…Concluding Remarks -- Acknowledgments -- 11 Tropical Biases -- Abstract -- 11.1…Introduction -- 11.2…Models and Data -- 11.3…Results -- 11.4…Concluding Remarks -- Acknowledgments -- 12 The Diurnal Rainfall Cycle in FGOALS -- Abstract -- 12.1…Introduction -- 12.2…Global Diurnal Rainfall Cycles -- 12.3…Diurnal Rainfall Variations Over China -- 12.3.1 Regional Average Diurnal Variations in Total Rainfall -- 12.3.2 Convective and Stratiform Rainfall -- 12.4…Conclusions -- Acknowledgments -- 13 Monsoon Intra-Seasonal Variability in Boreal Summer -- Abstract -- 13.1…Introduction -- 13.2…Simulation Results -- 13.2.1 Spatial Distribution of ISV Variance -- 13.2.2 Lead--Lag Correlation -- 13.2.3 30--80 Day Eastward ISV Mode -- 13.2.4 12--24 Day Westward ISV Mode -- 13.3…Conclusions -- Acknowledgments -- 14 ENSO and PDO in Two Versions of FGOALS -- Abstract -- 14.1…Introduction -- 14.2…ENSO and its Physical Mechanism in FGOALS-s2 and FGOALS-g2 -- 14.3…Pacific Decadal Oscillation -- 14.4…Summary -- 15 Seasonal Evolution of the Subtropical Anticyclones Simulated in FGOALS-s2 -- Abstract -- 15.1…Introduction -- 15.2…Seasonal Evolution of the Subtropical Anticyclone -- 15.2.1 South Asia Anticyclone -- 15.2.2 Subtropical Anticyclone Over the Western Pacific in the Middle Troposphere -- 15.2.3 Subtropical Anticyclone over the Eastern Pacific and Atlantic at the Surface -- 15.3…Summary and Discussion -- 16 Monsoon Regimes in FGOALS -- Abstract -- 16.1…Introduction -- 16.2…Asian Monsoon -- 16.3…African Monsoon -- 16.4…Global Monsoon -- 16.5…Conclusion -- 17 Stratospheric Circulation and its Changes in FGOALS-s2 -- Abstract -- 17.1…Introduction -- 17.2…Model and Data Description. , 17.2.1 FGOALS-s2 Climate System Model -- 17.2.2 Data -- 17.3…Winter Climatology and Seasonal Cycle -- 17.4…The Stratospheric Polar Vortex Oscillation in the SAMIL AGCM -- 17.5…Changes in Stratospheric Circulation in CMIP5 Scenarios Simulated by FGOALS-s2 -- 17.5.1 From the Past to the Present -- 17.5.2 Changes in the Future RCP4.5 and RCP8.5 Scenarios -- 17.5.3 Changes in the Leading Oscillation Mode -- 17.6…Summary -- Acknowledgment -- 18 The Atlantic Meridional Overturning Circulation, Atlantic Multi-Decadal Oscillation, and North Atlantic Oscillation in Three Climate System Models -- Abstract -- 18.1…Introduction -- 18.2…Data and Definitions of the Indices -- 18.3…Results -- 18.3.1 AMOC -- 18.3.2 NAO and its Correlation with AMOC -- 18.3.3 AMO and its Correlation with AMOC -- 18.4…Summary -- Acknowledgments -- 19 Mascarene High, Australian High, and Antarctic Oscillation Simulated by FGOALS-s2 -- Abstract -- 19.1…Introduction -- 19.2…Model and Data -- 19.3…Results -- 19.3.1 The Climatological Mean States in the Southern Hemisphere -- 19.3.2 Changes in MH, AH, and AAO Under Various RCPs -- 19.4…Conclusion -- Acknowledgments -- 20 Spring Persistent Rainfall in a Grid-Point and a Spectral Atmospheric General Circulation Models -- Abstract -- 20.1…Introduction -- 20.2…Data -- 20.3…Results -- 20.4…Summary -- Acknowledgments -- 21 The Silk Road Teleconnection Pattern in SAMIL2.0 -- Abstract -- 21.1…Introduction -- 21.2…Two Modes of the Silk Road Pattern -- 21.2.1 Methods -- 21.2.2 The Spatial Pattern of the Silk Road Pattern -- 21.2.3 Energetics of Two Modes of the Silk Road Pattern -- 21.2.4 The Interannual Variability of the Silk Road Pattern -- 21.3…Summary -- 22 The East Asian Subtropical Jet, East Asian Polarfront Jet, and Transient Activities in FGOALS -- Abstract -- 22.1…Introduction -- 22.2…EASJ, EAPJ, and STEA -- 22.2.1 Analysis Method. , 22.2.2 Climatology of the Jet Streams -- 22.2.2.1 The Dynamical and Thermal Feedbacks of the STEA on the Jet Streams -- 22.3…Discussion and Conclusions -- 23 Preliminary Evaluations of ENSO-Related Cloud and Water Vapor Feedbacks in FGOALS -- Abstract -- 23.1…Introduction -- 23.2…Data and Methodology -- 23.2.1 Model, Observational, and Reanalysis Datasets -- 23.2.2 Analysis Method -- 23.2.2.1 Feedbacks to El Niño Warming -- 23.2.2.2 Possible Causes for the Biases of the Feedbacks -- 23.3…Summary and Discussion -- Acknowledgments -- 24 The Twentieth Century Historical Climate Simulation of FGOALS -- Abstract -- 24.1…Introduction -- 24.2…Model, Data and Analysis Method -- 24.3…Results -- 24.4…Summary -- Acknowledgments -- 25 Climate Extremes in FGOALS -- Abstract -- 25.1…Introduction -- 25.2…Observational Data and Indices -- 25.3…Results -- 25.3.1 June--July--August Mean Conditions -- 25.3.2 December--January--February Mean Conditions -- 25.4…Projected Changes in Extreme Precipitation Under RCP8.5 Scenario -- 25.5…Summary -- Acknowledgments -- 26 Climate Sensitivity of the Flexible Global Ocean--Atmosphere--Land System Model -- Abstract -- 26.1…Introduction -- 26.2…ECS and Related Feedbacks -- 26.3…Summary and Concluding Remarks -- Acknowledgments -- 27 A Preliminary Diagnosis of High Climate Sensitivities simulated by FGOALS-s2 in CMIP5 Historical and RCP4.5 Scenarios -- Abstract -- 27.1…Introduction -- 27.2…Model Configuration -- 27.3…Positive Hydrological Feedbacks -- 27.4…Ocean Transport -- 27.5…Conclusions and Discussion -- 28 Decadal Climate Prediction of FGOALS -- Abstract -- 28.1…Experimental Design -- 28.2…Data -- 28.3…Preliminary Results -- 28.4…Conclusion -- 29 Last Millennial Climate Simulation of FGOALS -- Abstract -- 29.1…Introduction -- 29.2…Model, Numerical Experiments, and Data Description -- 29.2.1 Model Description. , 29.2.2 Experimental Design and Forcing Data -- 29.3…Results -- 29.3.1 Global Annual Mean SAT Changes During the Last Millennium -- 29.3.2 Detection and Attribution of Northern Hemisphere SAT Changes -- 29.3.3 Spatial Patterns of SAT -- 29.3.4 Centennial-Scale EASM Variations During the Last Millennium -- 29.4…Summary -- 30 Thermal Expansion-Induced Sea Level Increase Determined by Flexible Global Ocean--Atmosphere--Land System Model -- Abstract -- 30.1…Introduction -- 30.2…Analysis Method Description -- 30.3…Thermal Expansion-Induced Sea Level Increase Determined by FGOALS -- 30.3.1 Mean Dynamic Sea Level -- 30.3.1.1 Thermal Expansion-Induced Sea Level Changes Determined by Twentieth Century Historical Climate Simulation -- 30.3.1.2 Thermal Expansion-Induced Sea Level Changes Under IPCC-RCP8.5 Scenario Projection -- 30.4…Summary and Discussion -- Acknowledgments -- 31 Indian Ocean Warming During 1950--2005 Determined by Flexible Global Ocean--Atmosphere--Land System Model (FGOALS) -- Abstract -- 31.1…Introduction -- 31.2…Analysis Method Description -- 31.3…Results -- 31.3.1 Characteristics of Warming in the Indian Ocean -- 31.3.2 Mechanisms Responsible for Indian Ocean Warming in the Two FGOALS Models -- 31.4…Summary and Discussion -- Acknowledgments -- 32 Representative Concentration Pathway (RCP) Projection of Climate Change by FGOALS -- Abstract -- 32.1…Introduction -- 32.2…Model, Data, and Analysis Method -- 32.3…Results -- 32.4…Summary -- Acknowledgments -- 33 Paleoclimate Simulations by FGOALS -- Abstract -- 33.1…Introduction -- 33.2…Model and Experiments -- 33.2.1 FGOALS -- 33.2.2 Experimental Protocols -- 33.3…Model Results -- 33.3.1 Mid-Holocene -- 33.3.2 LGM -- 33.4…Mid-Pliocene -- 33.5…Conclusions -- Acknowledgments -- 34 Simulation of Snow Cover Fraction Over Eurasia Determined by FGOALS -- Abstract -- 34.1…Introduction -- 34.2…Model. , 34.3…Data and Methods.
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  • 2
    Online Resource
    Online Resource
    Singapore :Springer Singapore Pte. Limited,
    Keywords: Oceanography. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (265 pages)
    Edition: 1st ed.
    ISBN: 9789811000331
    DDC: 551.51011
    Language: English
    Note: Intro -- Preface -- Contents -- 1 Overview of the Chinese National Key Basic Research Project Entitled ``Development and Evaluation of High-Resolution Climate System Models'' -- Abstract -- 1.1 Introduction -- 1.1.1 Demand for the Sustainable Development of Economies and Society -- 1.1.2 Scientific Basis for Climate Change Research -- 1.1.3 Expected Contributions to Solving Problems at the National Level -- 1.2 Objectives -- 1.2.1 General Goals -- 1.2.2 Objectives of the 5-Year Project -- 1.3 Subprojects -- 1.4 Overview of the Project Implementation -- 1.5 Major Achievements -- 1.5.1 Development of a High-Resolution Version of the BCC_CSM Global Climate System Model -- 1.5.1.1 Development of High-Resolution Global AGCMs -- Global Spectral AGCM -- Global-Gridded AGCM -- Radiative Transfer Uncertainty -- 1.5.1.2 Development of High-Resolution Global OGCMs -- 1.5.1.3 Development of the High-Resolution Land Component Model -- 1.5.1.4 Development of BCC_CSM -- 1.5.2 The Model Evaluation System -- 1.5.2.1 Metrics for EASM -- 1.5.2.2 Metrics for Evaluating East Asian Cloud and Radiation -- 1.5.2.3 Metrics for Monsoon--ENSO Interaction -- 1.5.2.4 Metrics for Tropical Bias -- 1.5.2.5 Metrics for ENSO and the Aerosol Indirect Effect -- 1.5.3 The MME Coupling Platform -- 1.5.3.1 Design and Implementation -- 1.5.3.2 Portal -- 1.5.3.3 Performance Model and Process Layout Optimization for the Coupled Climate Model -- 1.5.3.4 Validation of the MME Coupling Platform -- 1.5.3.5 Application of the IE Model -- Climate Impact of Atmospheric Noise -- Impacts of Atmospheric Noise on ENSO -- The Role of Atmospheric Noise in NAO Variability -- 1.6 Concluding Remarks -- References -- 2 Studies on High-Resolution Atmospheric and Oceanic General Circulation Models -- 2.1 Introduction -- 2.2 Objectives -- 2.3 Major Achievements. , 2.3.1 Improvements of the Dynamical Core of the High-Resolution AGCM -- 2.3.2 Sensitivity of Simulated Climate to Dynamical Cores -- 2.3.3 Preliminary Results from the High-Resolution IAP AGCM4.0 -- 2.3.4 CAR Validation and Its Application to Further Improve the Performances of the Original Radiation Transfer Codes -- 2.3.4.1 Continual Intercomparison of Radiation Codes Experiments -- 2.3.4.2 ERA-Interim Experiments -- Overall Accuracy and Further Improvement of Radiation Code Performance -- Effects of Cloud Subgrid Structures on Radiative Calculation Accuracies -- 2.3.5 The Spread Related to Cloud and Radiation Calculations -- 2.3.6 Dominant Roles of Subgrid-Scale Cloud Structures in Model Differences of Cloud Radiative Effects -- 2.3.6.1 Origin and Reduction of Model Discrepancies in Cloud Radiative Effects -- 2.3.6.2 Dominant Roles of Cloud Subgrid Structure in the Model Differences of Estimated Radiative Components -- 2.3.6.3 Reduction in the Nonlinear Sensitivity of Model Spread to Cloud Fraction -- 2.3.7 Incorporation of the CAR System into the Physical Framework of IAP AGCM4 -- 2.3.8 A High-Resolution Global Ocean General Circulation Model Based on the Hybrid Coordinate Ocean Model -- 2.3.8.1 Model Setting -- 2.3.8.2 Preliminary Results from the High-Resolution Global Ocean Model -- 2.3.9 Other Achievements Related to IAP Model Performance -- 2.3.9.1 Simulation of Intraseasonal Variation of the East Asian Summer Monsoon -- 2.3.9.2 Simulation of Interdecadal Variation of the East Asian Summer Monsoon and Summer Rainfall in Eastern China -- 2.4 Summary -- References -- 3 Studies on the Model Dynamics and Physical Parameterizations of the High-Resolution Version of the Global Climate System Model BCC_CSM -- Abstract -- 3.1 Introduction -- 3.2 Objectives -- 3.3 Major Achievements -- 3.3.1 Advection Schemes. , 3.3.1.1 The Two-Step Shape-Preserving Advection Scheme -- 3.3.1.2 Flux-Form Semi-Lagrangian Transport Scheme -- 3.3.2 The Parameterization of Gravity Wave Drag -- 3.3.2.1 Convective Gravity Wave Source Parameterization -- 3.3.2.2 Frontal Gravity Wave Source Parameterization -- 3.3.3 Further Development of the Cumulus Convection Parameterization Scheme -- 3.3.4 Cloud and Its Interaction with Atmospheric Radiation -- 3.3.4.1 A Statistical Cloudiness Parameterization Based on the Probability Distribution Function of Cloud Water -- 3.3.4.2 An Algorithm to Calculate the Proportion of Cloud Ice and Liquid Water Content -- 3.3.4.3 Cloud Vertical Structure and Its Impact on Radiation -- 3.3.5 Improvements in the Parameterization of Surface Turbulent Fluxes Between Air and Sea/Sea Ice -- 3.3.5.1 Air--Sea Flux -- 3.3.5.2 Air--Sea Ice Flux -- 3.3.6 Parameterizations of Land Surface Processes -- 3.3.6.1 Temperature Threshold for Soil Freezing -- 3.3.6.2 Impacts of Soil Organic Matter on Soil Thermal and Hydraulic Conductivities -- 3.3.6.3 Seasonal Variation of Snow Aging and Snow Albedo -- 3.3.6.4 Plant Functional Type--Dependent Temperature Adjustment to the Maximum Rate of Carboxylation -- 3.3.6.5 A Four-Stream Radiative Transfer Parameterization Scheme Within the Canopy in the Land Surface Process Model -- 3.3.7 Vertical Mixing Processes in the Ocean -- 3.3.7.1 A Parameterization Scheme of Vertical Mixing Due to Inertial Internal Wave Breaking Implemented in MOM4_L40 -- 3.3.7.2 Impact of Wave-Induced Ocean Mixing Processes -- 3.4 Performance -- 3.4.1 The Stability of BCC_CSM -- 3.4.2 Global Distribution of Precipitation -- 3.4.3 Regional Climate Over East Asia -- 3.4.4 SST Over the Tropical Pacific Ocean -- 3.5 Summary -- References -- 4 Development and Testing of a Multi-model Ensemble Coupling Framework -- Abstract -- 4.1 Introduction -- 4.2 Objectives. , 4.3 Major Achievements -- 4.3.1 Multi-model Ensemble Coupling Framework -- 4.3.1.1 Design and Implementation of the Multi-model Ensemble Coupling Platform -- 4.3.1.2 Portal of the Multi-model Ensemble Coupling Platform -- 4.3.1.3 Model Performance and Optimization of the Layout of Processes for the Coupled Climate Model -- 4.3.2 Validation of the Multi-model Ensemble Coupling Framework -- 4.3.2.1 Validation for Numerical Precision -- 4.3.2.2 Scientific Verification of the SC and IE Models -- 4.3.3 Climate Impact of the Atmospheric Noise Investigated by the IE Model -- 4.3.4 Impacts of Atmospheric Noise on the Relationship Between ENSO and North Pacific SST Investigated by the IE Model -- 4.3.5 The Role of Atmospheric Noise in the NAO with the IE Model -- 4.4 Summary -- References -- 5 Metrics for Gauging Model Performance Over the East Asian--Western Pacific Domain -- Abstract -- 5.1 Introduction -- 5.2 Objectives -- 5.3 Major Achievements -- 5.3.1 Metrics for East Asian Summer Monsoon Simulation -- 5.3.1.1 Diurnal Cycle -- 5.3.1.2 Intensity Structure of Precipitation -- 5.3.1.3 Mean State of East Asian--Western Pacific Summer Climate -- 5.3.1.4 Interannual and Interdecadal Variability -- 5.3.1.5 East Asian Monsoon in a Global Monsoon Perspective -- 5.3.2 Metrics for East Asian Cloud and Radiation Simulation -- 5.3.2.1 Stratus Amount, Occurrence Frequency and Amount-when-present -- 5.3.2.2 Divergence and Stability Downstream of the Tibetan Plateau -- 5.3.2.3 The Distribution of Cloud Radiative Forcing in Dynamic and Thermodynamic Regimes -- 5.3.2.4 Composite Environmental Fields Associated with the Stratus Signal -- 5.3.3 Tropical Cloud Simulation -- 5.3.4 Processes for Improving Model Performance in ENSO Simulation -- 5.3.5 The Double ITCZ Bias in the Coupled Model. , 5.3.5.1 Observational Reference for Model Evaluation in the Southern Equatorial Pacific Ocean -- 5.3.5.2 Initial Development of SST Warm Bias in the Southern Equatorial Pacific Ocean in a Coupled Model -- 5.3.5.3 The Double ITCZ Bias in CMIP3 and CMIP5 Models -- 5.3.6 ENSO--Monsoon Relationship Simulated by FGOALS-s2 -- 5.3.6.1 El Niño Developing Summers -- 5.3.6.2 El Niño and La Niña Mature Winters and Their Asymmetry -- 5.3.6.3 El Niño Decaying Summers -- 5.3.7 Decadal Prediction System of FGOALS-gl and FGOALS-s2 -- 5.3.8 Other Achievements -- 5.3.8.1 Madden--Julian Oscillation -- 5.3.8.2 Correction of the Double ITCZ Bias -- 5.4 Summary -- References -- Index.
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  • 3
    Online Resource
    Online Resource
    Singapore : Springer Singapore
    Keywords: Earth sciences ; Earth Sciences ; Meteorology ; Climate change ; Oceanography ; Physical geography ; Atmospheric sciences ; Earth sciences ; Meteorology ; Climate change ; Oceanography ; Physical geography ; Atmospheric sciences ; Asiatisch-Pazifischer Raum ; China ; Klimamodell ; Monsun ; Klimaänderung ; Klimatologie ; Numerisches Modell ; Southern oscillation ; Sommermonsun ; Asiatisch-Pazifischer Raum ; China ; Klima ; Modell ; Monsun ; Klimaänderung ; Klimatologie ; Numerisches Modell ; Southern oscillation ; Sommermonsun
    Description / Table of Contents: Development and Evaluation of High Resolution Climate System Models: A Chinese National Key Basic Research Project (2010-2014) -- High Resolution AGCM and OGCM developed in IAP -- Improvements of resolution and physics in both coupled and uncoupled models of BCC -- Multi-models ensemble coupling framework and experiments -- Metrics for gauging model performance over East Asian-western Pacific.
    Type of Medium: Online Resource
    Pages: Online-Ressource (IX, 258 p. 149 illus., 111 illus. in color, online resource)
    Edition: 1st ed. 2016
    ISBN: 9789811000331
    Series Statement: SpringerLink
    Language: English
    Note: Includes bibliographical references and index , Development and Evaluation of High Resolution Climate System Models: A Chinese National Key Basic Research Project (2010-2014)High Resolution AGCM and OGCM developed in IAP -- Improvements of resolution and physics in both coupled and uncoupled models of BCC -- Multi-models ensemble coupling framework and experiments -- Metrics for gauging model performance over East Asian-western Pacific.
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  • 4
    Keywords: Klima ; Modell
    Type of Medium: Book
    Pages: XVI, 483 S , graph. Darst , 24 cm
    ISBN: 3642418007 , 9783642418006
    Series Statement: Springer earth system sciences
    DDC: 551.6011
    RVK:
    RVK:
    Language: English
    Note: Literaturverz. S. 453 - 483
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  • 5
    In: Climate dynamics, Berlin : Springer, 1986, (2009), 1432-0894
    In: year:2009
    In: extent:18
    Description / Table of Contents: During the twentieth century sea surface temperatures in the Atlantic Ocean exhibited prominent multidecadal variations. The source of such variations has yet to be rigorously establishedbut the question of their impact on climate can be investigated. Here we report on a set of multimodel experiments to examine the impact of patterns of warming in the North Atlantic, and cooling in the South Atlantic, derived from observations, that is characteristic of the positive phase of the Atlantic Multidecadal Oscillation (AMO). The experiments were carried out with six atmospheric General Circulation Models (including two versions of one model), and a major goal was to assess the extent to which key climate impacts are consistent between the different models. The major climate impacts are found over North and South America, with the strongest impacts over land found over the United States and northern parts of South America. These responses appear to be driven by a combination of an off-equatorial Gill response to diabatic heating over the Caribbean due to increased rainfall within the region and a Northward shift in the Inter Tropical Convergence Zone (ITCZ) due to the anomalous cross-equatorial SST gradient. The majority of the models show warmer US land temperatures and reduced Mean Sea Level Pressure during summer (JJA) in response to a warmer North Atlantic and a cooler South Atlantic, in line with observations. However the majority of models show no significant impact on US rainfall during summer. Over northern South America, all models show reduced rainfall in southern hemisphere winter (JJA), whilst in Summer (DJF) there is a generally an increase in rainfall. However, there is a large spread amongst the models in the magnitude of the rainfall anomalies over land. Away from the Americas, there are no consistent significant modelled responses. In particular there are no significant changes in the North Atlantic Oscillation (NAO) over the North Atlantic and Europe in Winter (DJF). Additionally, the observed Sahel drying signal in African rainfall is not seen in the modelled responses. Suggesting that, in contrast to some studies, the Atlantic Multidecadal Oscillation was not the primary driver of recent reductions in Sahel rainfall.
    Type of Medium: Online Resource
    Pages: 18 , graph. Darst
    ISSN: 1432-0894
    Language: English
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  • 6
    Publication Date: 2020-11-25
    Description: Purpose of Review Subtropical highs are an important component of the climate system with clear implications on the local climate regimes of the subtropical regions. In a climate change perspective, understanding and predicting subtropical highs and related climate is crucial to local societies for climate mitigation and adaptation strategies. We review the current understanding of the subtropical highs in the framework of climate change. Recent Findings Projected changes of subtropical highs are not uniform. Intensification, weakening, and shifts may largely differ in the two hemispheres but may also change across different ocean basins. For some regions, large inter-model spread representation of subtropical highs and related dynamics is largely responsible for the uncertainties in the projections. The understanding and evaluation of the projected changes may also depend on the metrics considered and may require investigations separating thermodynamical and dynamical processes. Summary The dynamics of subtropical highs has a well-established theoretical background but the understanding of its variability and change is still affected by large uncertainties. Climate model systematic errors, low-frequency chaotic variability, coupled ocean-atmosphere processes, and sensitivity to climate forcing are all sources of uncertainty that reduce the confidence in atmospheric circulation aspects of climate change, including the subtropical highs. Compensating signals, coming from a tug-of-war between components associated with direct carbon dioxide radiative forcing and indirect sea surface temperature warming, impose limits that must be considered.
    Description: Published
    Description: 371–382
    Description: 4A. Oceanografia e clima
    Description: N/A or not JCR
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
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    IPCC
    In:  In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth : Assessment Report of the Intergovernmental Panel on Climate Change : Chapter 4. , ed. by Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Pean, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonnoy, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R. and Zhou, B. IPCC, Genf, Switzerland, pp. 1-195.
    Publication Date: 2022-01-05
    Type: Book chapter , NonPeerReviewed
    Format: text
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