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  • Electronic books.  (7)
  • ddc:551  (2)
  • Abyssal circulation  (1)
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  • 1
    Online Resource
    Online Resource
    Les Ulis :EDP Sciences,
    Keywords: Lamiaceae. ; Lamiaceae-Classification. ; Microtoena-Classification. ; Electronic books.
    Description / Table of Contents: No detailed description available for "A Monograph of the genus Microtoena (Lamiaceae)".
    Type of Medium: Online Resource
    Pages: 1 online resource (150 pages)
    Edition: 1st ed.
    ISBN: 9782759825295
    Series Statement: Current Natural Sciences Series
    Language: English
    Note: Intro -- A Monograph of the Genus Microtoena (Lamiaceae) -- DEDICATION -- PREFACE -- ACKNOWLEDGEMENTS -- CONTENTS -- CHAPTER I. TAXONOMIC HISTORY AND QUESTIONS TO BE ADDRESSED -- TAXONOMIC HISTORY -- CIRCUMSCRIPTION AND PHYLOGENETICAL POSITION -- SUBDIVISION -- SPECIES DELIMITATION -- QUESTIONS TO BE ADDRESSED -- CHAPTER II. MORPHOLOGY -- ROOTS -- STEMS -- LEAVES -- LEAF LENGTH -- LEAF SHAPE -- LEAF MARGIN -- LEAF BASE -- LEAF SURFACE -- INFLORESCENCE -- BRACTS -- BRACT LENGTH -- BRACT SHAPE -- CALYX -- CALYX LENGTH -- CALYX SPLIT RATIO -- CALYX TOOTH RATIO -- COROLLA -- COROLLA COLOUR -- COROLLA LENGTH -- COROLLA TUBE RATIO -- APEX OF THE UPPER LIP OF THE COROLLA -- HAIRS OF THE UPPER LIP OF THE COROLLA -- MIDDLE LOBE OF THE LOWER LIP OF THE COROLLA -- STAMENS -- ANTHERS -- HAIRS ON THE FILAMENTS -- STYLE -- POLLEN -- FRUITS -- CHAPTER III. MOLECULAR PHYLOGENY, BIOGEOGRAPHY AND CHARACTER EVOLUTION -- PHYLOGENETICAL POSITION AND SUBDIVISION -- ORIGIN AND DIVERSIFICATION -- CHARACTER EVOLUTION -- CHAPTER IV. TAXONOMIC REVISION OF MICROTOENA -- MICROTOENA PRAIN -- KEY TO SECTIONS AND SPECIES OF MICROTOENA -- SECTION 1. Microtoena -- 1. Microtoena esquirolii -- 2. Microtoena insuavis -- 3. Microtoena patchoulii -- 4. Microtoena mollis -- SECTION. 2. Delavayana -- 5. Microtoena delavayi -- 6. Microtoena wardii -- 7. Microtoena urticifolia -- 8. Microtoena albescens -- 9. Microtoena stenocalyx -- 10. Microtoena miyiensis -- 11. Microtoena megacalyx -- 12. Microtoena moupinensis -- 14. Microtoena muliensis -- 13. Microtoena prainiana -- 15. Microtoena omeiensis -- 16. Microtoena brevipedunculata -- 17. Microtoena nepalensis -- 18. Microtoena robusta -- 19. Microtoena vanchingshanensis -- EXCLUDED NAME -- BIBLIOGRAPHY -- INDEX TO SPECIMENS CITED -- INDEX TO BOTANICAL NAMES AND SYNONYMS -- DATA OF STANDARD DEVIATION ANALYSIS.
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  • 2
    Online Resource
    Online Resource
    La Vergne :RSC,
    Keywords: Electronic books.
    Description / Table of Contents: An introduction to the different inorganic adsorbents/sorbents used in pre-combustion carbon dioxide capture.
    Type of Medium: Online Resource
    Pages: 1 online resource (363 pages)
    Edition: 1st ed.
    ISBN: 9781788013390
    Series Statement: ISSN Series
    Language: English
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  • 3
    Online Resource
    Online Resource
    Singapore :Springer Singapore Pte. Limited,
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (267 pages)
    Edition: 1st ed.
    ISBN: 9789811369674
    Series Statement: Lecture Notes in Chemistry Series ; v.103
    Language: English
    Note: Intro -- Preface -- Contents -- 1 Solid-State NMR Principles and Techniques -- 1.1 Introduction -- 1.2 Nuclear Spin Interactions in Solids -- 1.2.1 Chemical Shift Interaction -- 1.2.2 Dipole-Dipole Interaction -- 1.2.3 Quadrupolar Interaction -- 1.2.4 Spin-Spin Interaction -- 1.3 Manipulations of Spin Interactions in Solids -- 1.3.1 Magic-Angle Spinning (MAS) -- 1.3.2 Cross-Polarization -- 1.3.3 Dipolar Decoupling Methods in Rotating Solid -- 1.3.4 Dipolar Recoupling Methods in Rotating Solid -- 1.3.5 High-Resolution Techniques for Half-Integer-Spin Quadrupolar Nuclei -- 1.3.6 Summary -- References -- 2 Solid-State NMR Studies of Zeolites and Zeotype Materials Synthesis -- 2.1 Introduction -- 2.2 Zeolite Synthesis Route and Procedures -- 2.3 Zeolite Synthesis Process and Crystallization Mechanism -- 2.4 NMR Strategy in Characterization of Zeolite Synthesis -- 2.4.1 Microporous Aluminosilicates -- 2.4.2 Microporous Aluminophosphates -- 2.5 Summary -- References -- 3 Solid-State NMR Characterization of Framework Structure of Zeolites and Zeotype Materials -- 3.1 Introduction -- 3.2 Solid-State NMR Characterization of Zeolite Framework Structure -- 3.2.1 27Al MAS NMR -- 3.2.2 29Si MAS NMR -- 3.2.3 31P MAS NMR -- 3.2.4 17O MAS NMR -- 3.2.5 129Xe NMR -- 3.2.6 Other Framework Elements -- 3.3 Summary -- References -- 4 Solid-State NMR Characterization of Host-Guest Interactions -- 4.1 Introduction -- 4.2 Solid-State NMR Characterization of Host-Guest Interactions -- 4.2.1 Host-Guest Interaction Between Adsorbed Molecule and Zeolite Framework -- 4.2.2 Host-Guest Interaction in Molecular Sieve Synthesis -- 4.2.3 Host-Guest Interaction in Zeolite Catalysis -- 4.3 Summary -- References -- 5 Solid-State NMR Characterization of Acid Properties of Zeolites and Solid Acid Catalysts -- 5.1 Introduction -- 5.2 Solid-State NMR Characterization of Acidic Property. , 5.2.1 Acid Sites Containing Hydroxyl Groups -- 5.2.2 Acidic Nature and Strength -- 5.2.3 Location and Distribution of Acid Sites -- 5.2.4 Spatial Proximities and Synergy Effects of Different Acid Sites -- 5.3 Summary -- References -- 6 In Situ Solid-State NMR Investigation of Catalytic Reactions on Zeolites -- 6.1 Introduction -- 6.2 In Situ Solid-State NMR Approaches -- 6.2.1 Batch Reaction -- 6.2.2 Flow Reaction -- 6.3 Mechanistic Study of the Catalytic Reactions by In Situ NMR -- 6.3.1 Activation and Conversion of Light Alkanes -- 6.3.2 Methanol-to-Olefins (MTO) Conversion -- 6.4 Summary -- References -- Index.
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  • 4
    Online Resource
    Online Resource
    Oxford :CAB International,
    Keywords: Electronic books.
    Description / Table of Contents: This book features recent developments from cyanobacteria to eukaryotic algae, from theoretical biology to applied biology. It also includes the latest advancements in algal-based synthetic biology, including metabolic engineering, artificial biological system construction and green chemicals production.
    Type of Medium: Online Resource
    Pages: 1 online resource (325 pages)
    Edition: 1st ed.
    ISBN: 9781800621954
    Series Statement: CABI Biotechnology Series
    Language: English
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  • 5
    Online Resource
    Online Resource
    La Vergne :RSC,
    Keywords: Electronic books.
    Description / Table of Contents: An introduction to the different inorganic adsorbents/sorbents used in post-combustion carbon dioxide capture.
    Type of Medium: Online Resource
    Pages: 1 online resource (318 pages)
    Edition: 1st ed.
    ISBN: 9781788013352
    Series Statement: ISSN Series
    Language: English
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  • 6
    Online Resource
    Online Resource
    Singapore :Springer Singapore Pte. Limited,
    Keywords: Photosynthesis. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (346 pages)
    Edition: 1st ed.
    ISBN: 9789811531101
    DDC: 581.13342
    Language: English
    Note: Intro -- Preface -- Contents -- Part I: Photosynthesis and Energy Transfer -- Molecular Mechanism of Photosynthesis Driven by Red-Shifted Chlorophylls -- 1 General Knowledge of Photosynthesis -- 2 Photosynthetic Organisms -- 2.1 Photosynthetic Eukaryotes -- 2.2 Photosynthetic Prokaryotes -- 2.2.1 Anoxygenic Photosynthetic Prokaryotes -- 2.2.2 Oxygenic Photosynthetic Prokaryotes (Cyanobacteria) -- 3 Photopigments -- 3.1 Carotenoids -- 3.2 Phycobiliprotein Complexes -- 3.3 Chlorophylls -- 3.3.1 Chl a and Its Spectral Properties -- 3.3.2 Formyl Substitution in Chl b, Chl d, and Chl f -- 3.3.3 Diformyl Variants -- 3.3.4 Chl c Family -- 3.3.5 Other Chlorophyll Variants (Including Chemically Modified) -- 4 Photopigment-Binding Protein Complexes -- 4.1 Photosystem I -- 4.2 Photosystem II -- 4.3 Chlorophyll-Binding Light-Harvesting Protein Complexes (CBPs) -- 4.3.1 Inner Antenna Complexes -- 4.3.2 Chl-Binding Proteins in Cyanobacteria -- 4.3.3 Iron-Stress-Induced Chlorophyll-binding Protein A (IsiA) -- 4.4 Phycobilisomes (PBSs) -- 5 Acaryochloris marina -- 5.1 Light-Harvesting Systems -- 5.1.1 Chl d-Binding Light-Harvesting Proteins -- 5.1.2 Phycobiliproteins -- 5.2 Photosystems -- 5.3 Biochemistry of Chlorophyll d -- 6 Chl f-Producing Cyanobacteria -- 6.1 Occurrence of Chl f-Producing Cyanobacteria -- 6.2 Chl f and Photosynthetic Reactions -- 6.3 Biochemistry of Chl f -- 7 Applications of Red-Shifted Chlorophylls -- References -- Cyanobacterial NDH-1-Photosystem I Supercomplex -- 1 Introduction -- 2 Identification -- 3 Function -- 4 Assembly -- 5 Evolutional Change -- 6 Concluding Remarks -- References -- Recent Progress on the LH1-RC Complexes of Purple Photosynthetic Bacteria -- 1 Introduction -- 2 Structure of the LH1-RC Complexes -- 2.1 Overall Structure of LH1-RC Complex -- 2.2 Novel Structural Features of the Intact RC Complex. , 2.3 Potential Exchange Pathway for Quinones -- 2.4 Structural Basis for the Redshift and Enhanced Thermostability -- 3 Dynamic Process Involved in the LH1-RC -- 3.1 Exciton Delocalization and Relaxation on the LH1 Ring -- 3.2 LH1 → RC Energy Trapping -- 3.3 Charge Separation and Electron Transfer in RC -- 3.4 Carotenoid and Photo-Protection -- 4 Concluding Remarks -- References -- Composition, Organisation and Function of Purple Photosynthetic Machinery -- 1 General Introduction -- 2 Structural Components -- 2.1 Peripheral Antenna Complexes -- 2.1.1 Light-Harvesting Complex 2 -- 2.1.2 Light-Harvesting Complexes 3 and 4 -- 2.2 The Core Complex of Purple Bacterial Photosynthesis -- 2.2.1 Light-Harvesting Complex 1 -- 2.2.2 The Photochemical Reaction Centre -- 2.2.2.1 Quinones -- 2.2.3 Additional Core Complex Components -- 2.2.3.1 PufX -- 2.2.3.2 Protein W -- 2.2.3.3 The Gamma Subunit -- 2.2.4 Architectures of Core Complexes -- 2.3 Cofactors and Pigments -- 2.3.1 Carotenoids -- 2.3.2 Bacteriochlorophylls -- 2.3.3 Bacteriopheophytins -- 2.4 Cofactor-Cofactor and Protein-Protein Interactions -- 2.5 Assembly of Complexes -- 2.6 Spectroscopic Properties of Light-Harvesting Complexes -- 2.7 Cytochrome bc1 -- 2.8 ATP Synthase -- 2.9 Cytochrome c2 -- 3 Organisation and Assembly of Photosynthetic Membranes -- 3.1 Common Features of the Photosynthetic Membranes -- 3.2 Functional Importance of Photosynthetic Membrane Organisation -- 4 Energy Transfer -- 4.1 Transfer of Excitation Energy -- 4.2 Charge Separation in the RC -- 4.3 Electron Transfer in Cytochrome c2 -- 4.4 Modified Q Cycle -- 4.5 Proton Translocation and ATP Synthase -- 5 Calvin-Benson-Bassham Cycle -- References -- Redox Potentials of Quinones in Aqueous Solution: Relevance to Redox Potentials in Protein Environments -- 1 Introduction -- 2 Em for Quinones in Water and in Protein Environments. , 3 Alternative Approach for Calculating Em of Quinones and Other Cofactors -- References -- Photosynthesis in Chlamydomonas reinhardtii: What We Have Learned So Far? -- 1 Introduction -- 2 Photosynthetic Complexes Biogenesis and Regulation -- 2.1 Photosynthetic Genes Expression -- 2.2 Photosynthetic Pigments Biosynthesis -- 2.3 PSI Biogenesis and Functional Regulation -- 2.4 PSII Biogenesis and Functional Regulation -- 2.5 Photosynthetic Electron Transport -- 3 Concluding Remarks -- References -- Part II: Photosynthesis and the Environment -- Photosynthetic Performances of Marine Microalgae Under Influences of Rising CO2 and Solar UV Radiation -- 1 Introduction -- 2 Effects of Increasing CO2 Concentration and Declining pH -- 3 UV and Its Effect on Marine Photosynthetic Carbon Fixation -- 4 The Combined Effects of OA and UV Radiation -- 5 Perspectives -- References -- Acquisition of Inorganic Carbon by Microalgae and Cyanobacteria -- 1 Introduction -- 2 Rubisco and the Calvin Cycle Are Central Features of C Acquisition in All Cyanobacteria and Microalgae -- 3 Rubisco Also Has an Oxygenase Activity Which Leads to Inefficiencies in C Assimilation -- 4 Cyanobacteria and Microalgae Possess Mechanisms That Minimise the Effects of Unfavourable Rubisco Kinetics and Photorespiration -- 4.1 Evolution of Rubiscos More Favourable to the  Carboxylase Activity -- 4.2 CO2 Concentrating Mechanisms Increase CO2:O2 at the Rubisco Active Site -- 4.2.1 Biochemical CCMs -- 4.2.2 Biophysical CCMs -- 4.2.3 The Extent of CCM Activity -- 4.3 Heterotrophic Carbon Assimilation -- 4.3.1 Dark Carbon Fixation -- References -- Circadian Clocks in Cyanobacteria -- 1 Introduction -- 2 Kai-Based Oscillator -- 3 Synchronization with the Environment -- 4 Coordination of Cellular Activities -- 5 Conclusions -- References -- Iron Deficiency in Cyanobacteria. , 1 The Challenges of Iron Deficiency in Cyanobacteria -- 2 The Strategies for Adaptation to Iron Deficiency in Cyanobacteria -- 2.1 Retrenchment -- 2.2 Compensation -- 2.3 Acquisition -- 3 Important Iron-Deficiency Proteins in Cyanobacteria -- 3.1 IsiA -- 3.2 Fur -- 3.3 IdiA -- 3.4 PfsR -- 4 Conclusion -- References -- Adaptive Mechanisms of the Model Photosynthetic Organisms, Cyanobacteria, to Iron Deficiency -- 1 The Feature of Cyanobacterial Cell Wall -- 2 The Distribution of Cyanobacteria and Its Significance in Global Primary Productivity -- 3 The Indissoluble Bond Between Cyanobacteria and Iron -- 4 Existence Form and Availability of Iron -- 5 The Physiological Functions of Iron in Cyanobacteria -- 6 Iron Limitation Hypothesis -- 7 Physiological Response of Cyanobacteria to Iron Limitation -- 7.1 Photosynthesis -- 7.2 Respiration -- 7.3 Nitrogen Fixation -- 7.4 Oxidative Stress -- 8 Adaptative Strategies of Cyanobacteria to Iron Limitation -- 8.1 Biosynthesis and Secretion of Iron Chelators -- 8.1.1 Types of Siderophores -- 8.1.2 Siderophore Biosynthesis and Phylogenetical Distribution in Cyanobacteria -- 8.1.3 Siderophore Secretion and Uptake in Cyanobacteria -- 8.2 Induction of Protective Proteins Such as IsiA to Avoid Photooxidation of Photosystem I -- 8.3 Decrease Iron Demand and Maintain a Lower Metabolic Level -- 8.4 Increase of Iron Uptake Capacity and Balance Active and Passive Transport -- 8.4.1 Active Transport of Siderophore-Chelated Iron and Unchelated, Inorganic Iron (Fe′) -- 8.4.2 Passive Diffusion: Uptake of Inorganic Free Iron -- 8.5 Optimize Ferrous and Ferric Iron Transport -- 8.6 Development of Special Cell Surface Structure to Facilitate Iron Adhesion and Uptake -- 8.7 Reduce the Cell Size and Increase Specific Surface Area to Facilitate Passive Diffusion of Iron -- 9 Signal Transduction of Iron Deficiency in Cyanobacteria. , 9.1 The Global Regulator Fur -- 9.2 PfsR -- 9.3 Noncoding RNA -- 10 Outlooks on Cyanobacterial Adaptive Strategies to Marine Iron Limitation -- References -- The Roles of sRNAs in Regulating Stress Responses in Cyanobacteria -- 1 Introduction -- 2 Methods for Studying the Noncoding Transcriptomes of Cyanobacteria and Identifying Stress-Responsive sRNAs -- 3 sRNAs Involved in Stress Response Pathways -- 3.1 Light-Dependent Stress -- 3.2 Nitrogen Stress -- 3.3 Iron Homeostasis -- 4 Conclusions and Perspectives -- References -- Part III: Artificial Photosynthesis and Light-driven Biofactory -- Mimicking the Mn4CaO5-Cluster in Photosystem II -- 1 Introduction -- 2 Structure of the OEC -- 3 Mechanism for the Water-Splitting Reaction in the OEC -- 4 Challenge for the Synthesis of the OEC in Laboratory -- 5 Closer Mimicking of the OEC -- 6 Implications for the Mechanism of the Water-Splitting Reaction in OEC -- 7 Conclusion -- References -- Photosynthetic Improvement of Industrial Microalgae for Biomass and Biofuel Production -- 1 Introduction -- 2 Genetic and Biological Engineering of Photosynthesis in Microalgae -- 2.1 Photoprotection Mechanisms and Antenna Size -- 2.2 Manipulation of Antenna and Its Size -- 2.3 Engineering of PS Pigments -- 2.4 Delivery of Heterologous Proteins to the Plastids of Target Species -- 3 Photosynthesis and Lipids -- 3.1 Classification of Lipids -- 3.2 Storage Lipids in Microalgae: Triacylglycerol -- 3.3 Functional Lipids in Microalgae -- 3.3.1 Membrane Lipids for Photosynthesis -- 3.3.2 Polyunsaturated Fatty Acids (PUFAs) for Plant Defense -- 3.3.3 Carotenoids for Stress Response and Photosynthesis -- References -- Self-Assembly, Organisation, Regulation, and Engineering of Carboxysomes: CO2-Fixing Prokaryotic Organelles -- 1 Bacterial Microcompartments -- 1.1 The BMC Shells -- 1.2 The BMC Cargo Enzymes. , 2 CO2-Concentrating Mechanisms and CO2 Uptake Systems.
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  • 7
    Online Resource
    Online Resource
    Berlin/Boston :Walter de Gruyter GmbH,
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (274 pages)
    Edition: 1st ed.
    ISBN: 9783110544183
    Series Statement: De Gruyter STEM Series
    Language: English
    Note: Intro -- Preface -- Contents -- List of Contributors -- 1. Noncatalytic and catalytic oxidation of organic pollutants in wastewater by air -- 2. Catalytic oxidation of volatile organic compounds -- 3. Functional catalysts for catalytic removal of formaldehyde from air -- 4. Recent advances in catalytic oxidation of NO to NO< -- sub> -- 2< -- /sub> -- -- 5. Selective catalytic reduction of nitrogen oxides by NH< -- sub> -- 3< -- /sub> -- -- 6. Photocatalytic removal of gaseous elemental mercury -- 7. Recovery of valuable metals from e-waste via applications of nanomaterials -- Index.
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  • 8
    Publication Date: 2023-12-05
    Description: The Arctic is warming much faster than the global average. This is known as Arctic Amplification and is caused by feedbacks in the local climate system. In this study, we explore a previously proposed hypothesis that an associated wind feedback in the Barents Sea could play an important role by increasing the warm water inflow into the Barents Sea. We find that the strong recent decrease in Barents Sea winter sea ice cover causes enhanced ocean‐atmosphere heat flux and a local air temperature increase, thus a reduction in sea level pressure and a local cyclonic wind anomaly with eastward winds in the Barents Sea Opening. By investigating various reanalysis products and performing high‐resolution perturbation experiments with the ocean and sea ice model FESOM2.1, we studied the impact of cyclonic atmospheric circulation changes on the warm Atlantic Water import into the Arctic via the Barents Sea and Fram Strait. We found that the observed wind changes do not significantly affect the warm water transport into the Barents Sea, which rejects the wind‐feedback hypothesis. At the same time, the cyclonic wind anomalies in the Barents Sea increase the amount of Atlantic Water recirculating westwards in Fram Strait by a downslope shift of the West Spitsbergen Current, and thus reduce Atlantic Water reaching the Arctic basin via Fram Strait. The resulting warm‐water anomaly in the Greenland Sea Gyre drives a local anticyclonic circulation anomaly.
    Description: Plain Language Summary: The Barents Sea has been experiencing a rapid decrease in its winter sea ice extent during the last 30 years. The loss of sea ice creates new areas where, in winter, the relatively warm ocean loses heat to the cold atmosphere. As warm air rises, the warming reduces the sea level air pressure, changing the atmospheric circulation to develop a local anticlockwise wind system centered over the northern Barents Sea. The associated eastward winds in the Barents Sea Opening and southeastward winds in Fram Strait affect how warm water from the North Atlantic moves toward the Arctic. There has been a long debate on whether this wind anomaly can increase the warm Atlantic Water transport into the Barents Sea and thus cause a positive feedback mechanism for further reducing the sea ice through melting. We find that the observed atmospheric circulation changes have no significant impact on the Barents Sea warm water inflow and thus reject the wind feedback as a strong player in contributing to Arctic Amplification. However, strong anomalous southeastward winds in Fram Strait and the northern Nordic Seas cause a southward shift of the warm Atlantic Water recirculation and reduce its flow toward the Arctic.
    Description: Key Points: A hypothesis that a wind feedback contributes to Arctic Amplification is rejected by performing dedicated wind perturbation simulations. Winter sea ice retreat in the northern Barents Sea causes anomalous cyclonic winds by locally enhancing ocean heat loss. Anomalous cyclonic winds result in less Atlantic Water transport through Fram Strait.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: North‐German Supercomputing Alliance
    Description: https://github.com/FESOM/fesom2
    Description: https://doi.org/10.7265/N5K072F8
    Description: https://doi.org/10.5065/D6HH6H41
    Description: https://doi.org/10.5065/D6WH2N0S
    Description: https://github.com/FESOM/pyfesom2
    Description: https://doi.org/10.5281/zenodo.7458143
    Keywords: ddc:551 ; Barents Sea ; Arctic Amplification ; feedback ; Atlantic water ; modeling ; Fram Strait
    Language: English
    Type: doc-type:article
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  • 9
    Publication Date: 2022-12-16
    Description: Author Posting. © American Meteorological Society, 2022. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 52(7), (2022): 1415–1430. https://doi.org/10.1175/JPO-D-21-0147.1.
    Description: Strong subinertial variability near a seamount at the Xisha Islands in the South China Sea was revealed by mooring observations from January 2017 to January 2018. The intraseasonal deep flows presented two significant frequency bands, with periods of 9–20 and 30–120 days, corresponding to topographic Rossby waves (TRWs) and deep eddies, respectively. The TRW and deep eddy signals explained approximately 60% of the kinetic energy of the deep subinertial currents. The TRWs at the Ma, Mb, and Mc moorings had 297, 262, and 274 m vertical trapping lengths, and ∼43, 38, and 55 km wavelengths, respectively. Deep eddies were independent from the upper layer, with the largest temperature anomaly being 〉0.4°C. The generation of the TRWs was induced by mesoscale perturbations in the upper layer. The interaction between the cyclonic–anticyclonic eddy pair and the seamount topography contributed to the generation of deep eddies. Owing to the potential vorticity conservation, the westward-propagating tilted interface across the eddy pair squeezed the deep-water column, thereby giving rise to negative vorticity west of the seamount. The strong front between the eddy pair induced a northward deep flow, thereby generating a strong horizontal velocity shear because of lateral friction and enhanced negative vorticity. Approximately 4 years of observations further confirmed the high occurrence of TRWs and deep eddies. TRWs and deep eddies might be crucial for deep mixing near rough topographies by transferring mesoscale energy to small scales.
    Description: This work was supported by the National Natural Science Foundation of China (92158204, 91958202, 42076019, 41776036, 91858203), the Open Project Program of State Key Laboratory of Tropical Oceanography (project LTOZZ2001), and Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0304).
    Description: 2022-12-16
    Keywords: Abyssal circulation ; Ocean circulation ; Ocean dynamics ; Intraseasonal variability
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 10
    Publication Date: 2022-06-17
    Description: We examine the historical evolution and projected changes in the hydrography of the deep basin of the Arctic Ocean in 23 climate models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6). The comparison between historical simulations and observational climatology shows that the simulated Atlantic Water (AW) layer is too deep and thick in the majority of models, including the multi‐model mean (MMM). Moreover, the halocline is too fresh in the MMM. Overall our findings indicate that there is no obvious improvement in the representation of the Arctic hydrography in CMIP6 compared to CMIP5. The climate change projections reveal that the sub‐Arctic seas are outstanding warming hotspots, causing a strong warming trend in the Arctic AW layer. The MMM temperature increase averaged over the upper 700 m at the end of the 21st century is about 40% and 60% higher in the Arctic Ocean than the global mean in the SSP245 and SSP585 scenarios, respectively. Salinity in the upper few hundred meters is projected to decrease in the Arctic deep basin in the MMM. However, the spread in projected salinity changes is large and the tendency toward stronger halocline in the MMM is not simulated by all the models. The identified biases and projection uncertainties call for a concerted effort for major improvements of coupled climate models.
    Description: Plain Language Summary: Coupled climate models are crucial tools for understanding and projecting climate change, especially for the Arctic where the climate is changing at unprecedented rates. A cold fresh layer of water (aka halocline) has been protecting sea‐ice at the surface from the warm layer of water (aka Atlantic Water layer) which flows underneath and could potentially accelerate sea ice melting from below. Climate change disturbs this vertical structure by changing the temperature and salinity of the Arctic Ocean (in a process known as Atlantification and Pacification) which may lead to additional sea ice basal melting and accelerate sea ice decline. We examined the simulated temperature and salinity in the Arctic Ocean deep basin in state‐of‐the‐art climate model simulations which provided the basis for the IPCC Assessment Report. We found that although there are persistent inaccuracies in the representation of Arctic temperature and salinity, the Arctic Ocean below 100 m is subject to much stronger warming than the average global ocean. On the other hand, the upper Arctic Ocean salinity is projected to decrease, which on average may strengthen the isolation of sea ice from Atlantic Water heat in the Arctic deep basin area.
    Description: Key Points: A too deep and thick Arctic Atlantic Water layer continues to be a major issue in contemporary climate models contributing to the CMIP6. The Arctic Ocean below the halocline is subject to much stronger warming than the global mean during the 21st century. The multi‐model mean upper ocean salinity is projected to decrease in the future but with high uncertainty.
    Description: European union&apos;s Horizon 2020 research and innovation programme
    Description: German Helmholtz climate initiative REKLIM
    Description: Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659
    Description: https://esgf-data.dkrz.de/projects/esgf-dkrz/
    Description: http://psc.apl.washington.edu/nonwp_projects/PHC/Data3.html
    Keywords: ddc:551
    Language: English
    Type: doc-type:article
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